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Large salt accumulations as a consequence of hydrothermal processes associated with ‘Wilson cycles’: A review Part 1: Towards a new understanding

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The formation of large salt deposits is observed especially in areas with a geological history of high tectonic activity. Over the last decade it has become a well-established fact that heavy brines form and solid salts precipitate, due to the thermodynamic and physico-chemical properties of seawater at high temperatures and pressures encountered within hydrothermal systems. This article reviews the modern theoretical and experimental research behind these findings, and also describes geological settings that most likely cause brine- and salt-forming hydrothermal processes to occur. This analysis has led to the identification of a set of specific conditions, properties, and processes (referred to as Conceptual elements) that are used to explain the often complex processes of brine behavior that leads to hydrothermal formation of solid salt.The main objective of this review is to present hydrothermal conditions known to occur during Wilson cycles: subduction, collision, and rifting, e.g., zones of repeated tectonic unrest, where brines (commonly derived from seawater) are concentrated into heavy brines and precipitate solid salts. The internal heat of the Earth and its interaction with deeply-circulating seawater in hydrothermal systems and also the immense recycling of crustal materials, including porous oceanic crust and serpentinite (hydrated) rocks via mantle processes may lead to the formation of salt accumulations. It is also acknowledged that such brines and solid salts may often be stored sub-surface for long time periods, extending from one Wilson cycle to another. Thus, on the basis of this analysis, it is cautiously suggested that large amounts of salts 'hidden' inside subduction zones may appear on the surface during subsequent rifting and oceanization phases.In Part 2 of this review, the Conceptual elements, which are described and discussed herein (Part 1) are applied to selected cases, including the Andean Mountains, the East African Rift, the Red Sea Rift, and other locations.
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UNCORRECTED PROOF
5;2'4*+9'2 '7/4+'4*!+9752+:3+525-> ===  ======
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9 J=VFAF? G> L@= K9DL LQH=K O@=J=:Q L@= EGKL KGDM:D= GF=K 9J= HJ=
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>JGE L@=K= @=9NQ :JAF=K GF L@= K=9WGGJ HGF<AF?EAFA:9KAF >GJE9
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IM=FLA9D 9K K=N=J9D G> L@= KL=HK E9Q G;;MJ KAEMDL9F=GMKDQ 9DL@GM?@ GF=
KL=H E9Q 9L 9 ;=JL9AF LAE= := EGJ= <GEAF9FL L@9F L@= GL@=J $MJL@=J
EGJ= AL EMKL := FGL=< L@9L L@= 9;;MEMD9LAGF G> K9DL AF KH=;AV; J=?AGFK
AK >MDDQ <=H=F<=FL GF L@= DG;9D ;GF<ALAGFK G> K9DL HJ=K=JN9LAGF 9K O=
<AK;MKK AF !@  'L K@GMD< L@=J=>GJ= FGL ;GE= 9K 9 KMJHJAK= L@9L 9D
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UNCORRECTED PROOF
5;2'4*+9'2 '7/4+'4*!+9752+:3+525-> ===  ======
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UNCORRECTED PROOF
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UNCORRECTED PROOF
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UNCORRECTED PROOF
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UNCORRECTED PROOF
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UNCORRECTED PROOF
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
UNCORRECTED PROOF
5;2'4*+9'2 '7/4+'4*!+9752+:3+525-> ===  ======
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
UNCORRECTED PROOF
5;2'4*+9'2 '7/4+'4*!+9752+:3+525-> ===  ======
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LAN=DQ KE9DD ;GEH9J=< LG L@= NGDME= G> L@= KGDA< JG;CK 9F< @=F;= L@9L
L@=Q E9Q GFDQ J=HJ=K=FL 9 EAFGJ KGMJ;= G> K9DL 2@AK NA=O <G=K FGL ;9H
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
UNCORRECTED PROOF
5;2'4*+9'2 '7/4+'4*!+9752+:3+525-> ===  ======
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9N=J9?= ;AJ;MD9LAGF J9L= G> ;JMKL L@JGM?@ L@= E9FLD= LG := AF L@= GJ<=J
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UNCORRECTED PROOF
5;2'4*+9'2 '7/4+'4*!+9752+:3+525-> ===  ======
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UNCORRECTED PROOF
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WGO AF 'KJ9=D %=GL@=JEA;K   U @LLHK<GAGJ?
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AF? D=KKGFK D=9JF=< >JGE G;=9F <==HK 'F 09KMD ,+ 1L=O9JL '!$ #<K 2@=
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:Q DGO=J E9FLD= KM:<M;LAGF #9JL@ .D9F=L 1;A *=LL  @LLHK<GAGJ?B
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EG<=DAF? G> E9?E9LA;@Q<JGL@=JE9D 9;LANALQ 9L KM:E9JAF= 9J; NGD;9FG=K OAL@ AEHDA
;9LAGFK >GJ GJ= >GJE9LAGF #9JL@ .D9F=L 1;A *=LL  U
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&9FFAF?LGF + &=JRA? . 1LG>>=JK . 1;@GDL=F ( GLR 0 %9J:=1;@öF:=J? " (GF9K
KGF ' 0G=KL 5  $AJKL G:K=JN9LAGFK G> @A?@L=EH=J9LMJ= KM:E9JAF= @Q<JGL@=J
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HGL9K@ =N9HGJAL=K 9 @QHGL@=KAK E ( 1;A  U
&9JDGN "# 49F "=F )=JC@G>  (G@9FKKGF *  2@= 49J:=J?2GJH9 ;@9JFG;C
AL=?J9FAL= 9KKG;A9LAGF 15 1O=<=F EAF=J9DG?Q H=LJGDG?Q 9F< WMA< AF;DMKAGF ;@=E
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&9Q9K@A & &9CML9 7  &Q<JGL@=JE9D KQFL@=KAK G> E=L9D GPA<= F9FGH9JLA;D=K AF KM
H=J;JALA;9D O9L=J +9L=JA9DK  U
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#9JL@  U
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@9DAL=&-!- KQKL=E %=G;@=E !GKEG;@AE ;L9  U
&GND9F< + $A;@D=J ! 0M=KDåLL=F & (G@FK=F &) 9 "==H JGGL=< HA=J;=E=FL
KLJM;LMJ=K AF <==H K=<AE=FL9JQ :9KAFKE9FA>=KL9LAGFK G> KMH=J;JALA;9D O9L=J ?=F=J9
LAGF 9L <=HL@ ( %=G;@=E #PHDGJ  U
&GND9F< + )MRF=LKGN9 2 0M=KDåLL=F & )N9EE=  (G@FK=F &) $D9<E9JC %#
&=:9;@  : 1M:KMJ>9;= HJ=;AHAL9LAGF G> K9DLK AF KMH=J;JALA;9D K=9O9L=J 9KAF
0=K  U
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UNCORRECTED PROOF
5;2'4*+9'2 '7/4+'4*!+9752+:3+525-> ===  ======
&GND9F< + 0M=KDåLL=F &% (G@FK=F &) )N9EE=  )MRF=LKGN9 2 ; 19DL >GJ
E9LAGF 9KKG;A9L=< OAL@ KM:KMJ>9;= :GADAF? 9F< KMH=J;JALA;9D O9L=J +9J .=LJGD %=GD
 U
&GND9F< + 0M=KDåLL=F & (G@FK=F &)  MJA=< @Q<JGL@=JE9D KQKL=EK L@= HG
L=FLA9D JGD= G> KMH=J;JALA;9D O9L=J1;JA5 AF N9JAGMK ?=GDG?A;9D HJG;=KK=K 9F< G;;MJ
J=F;=K AF L@= KM:KMJ>9;= E ( F9D !@=E  U
&GND9F< + 0M=KDåLL=F & (G@FK=F &)  0=< 1=9 K9DL >GJE9LAGFK  9 J=KMDL G> @Q
<JGL@=JE9D HJG;=KK=K 'F 09KMD ,+ 1L=O9JL '!$ #<K 2@= 0=< 1=9 1HJAF?=J
#9JL@ 1QKL=E 1;A=F;=K =JDAF &=A<=D:=J? HH U
&GND9F< + 0M=KDåLL=F & (G@FK=F &) +9FM=DD9 $  .GKKA:D= JGD= G> K9DL 9;;M
EM9DLAGFK AF 5ADKGF ;Q;D=K 'F 9:KLJ9;L .JG;==<AF?K G> L@= JL@MJ &GDE=K +==LAF?
 %=GD 1G; *GF<GF +9Q 
&Kü )( !AL9 +  0Q9F 5 $ 9 2@= -JA?AF G> L@= +=<AL=JJ9F=9F #N9HGJAL= 'FA
LA9D 0=HGJLK G> L@= "==H 1=9 "JADDAF? .JGB=;L %GN=JFE=FL .JAFLAF? ->V;= U
4 
&Kü ) 0Q9F 5 !AL9 + : *9L= +AG;=F= <=KA;;9LAGF G> L@= E=<AL=JJ9F=9F ,9LMJ=
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JG;C K9DL 9 ;9K= KLM<Q G> L@= AF>J9!9E:JA9F J9 K9DL >JGE L@= KGML@ -E9F K9DL :9KAF
E KKG; .=LJGD %=GD MDD   U
1;GLL 1 "JA=KF=J 2 5=AK .  GADAF? 9F< ;GF<=FK9LAGF G> K9DAF= ?=GL@=JE9D WMA<K
9:GN= E9?E9LA; AFLJMKAGFK %=GH@QK 0=K *=LL  U
1;JA:9FG 4 !9J:GF= 1 +9FM=DD9 $! &GND9F< + 0M=KDåLL=F & (G@FK=F &)
 -JA?AF G> K9DL ?A9FLK AF 9:QKK9D K=JH=FLAFAL= KQKL=EK 'FL ( #9JL@ 1;A 
1;JA:9FG 4 4A;;9JG +  1A;ADQ ,A;GDGKA !9L9FA9  +AK;=DD9F=9 ',%4 '11,
 #FJGML= $GJE9LAGF G> &A?@DQ 1ADA;9MF<=JK9LMJ9L=< +=DLK L@JGM?@ 'FL=J9;
LAGF :=LO==F K;=F<AF? 9K9DL 9F< 1=JH=FLAFAL=J=D9L=< 19DAF= JAF=K 'F>=J=F;= >JGE
&Q:D=9F !=FGRGA; ,=H@=DAFAL=K NGD  
1=9JD= 0! 0GKK "   ?=GH@QKA;9D KLM<Q G> L@= 0=< 1=9 9PA9D LJGM?@ :=LO==F
 9F<  , %=GH@QK ( 'FL  U
1=DD=Q 0!  +AF=J9DG?Q 9F< ;D9KKAV;9LAGF 'F 1=DD=Q 0! !G;CK *0+ .DAE=J
'0 #<K #F;Q;DGH=<A9 G> %=GDG?Q #DK=NA=J EKL=J<9E HH U
1@9JH 8 9JF=K (  59L=JKGDM:D= ;@DGJA<=K AF E9KKAN= K=9WGGJ K=JH=FLAFAL=K 9
KGMJ;= G> ;@DGJA<= AF KM:<M;LAGF RGF=K #9JL@ .D9F=L 1;A *=LL  U
1FGO (# #<EGF<K &,  3DLJ9KDGOKHJ=9<AF? JA<?=K J9HA< H9J9<A?E ;@9F?=K
-;=9FG?J9H@Q  U
1G:GD=N  &G>E9FF 5 (G;@ME ). )MREAF "4 1LGDD   2@= 9?= G> KM:
<M;L=< ;GEHGF=FLK AF L@= KGMJ;= G> &9O9AA9F HDME= ,9LMJ= 
1GR9FKCQ 4  -JA?AF G> K9DL <=HGKALK AF <==HO9L=J :9KAFK G> LD9FLA; -;=9F .%
MDD  U
1JAC9FL9HH9 ! ,9J9KAE@9 ). 9K9N9J9B9HH9 &  &A?@DQ K9DAF= WMA< AF;DMKAGFK
AF !@9EMF<A ?J9FAL= 1GML@ 'F<A9 !MJJ 1;A U
1LJGF;AC , &99K= )+  !@DGJAF= AF G;=9FA; AFLJ9HD9L= :9K9DLK ;GFKLJ9AFLK GF
E9FLD= KGMJ;=K 9F< J=;Q;DAF? HJG;=KK=K %=GDG?Q  U
1N=FK=F & (9ELN=AL  9FCK " MKLJ@=AE &  &9DG?=F ;GFL=FLK G> =;DG?
AL= >9;A=K WMA< AF;DMKAGFK 9F< EAF=J9DK ;9D=<GFA<=K O=KL=JF ,GJO9Q ( +=L9EGJH@
%=GD  U
1N=FK=F && 2GJKNAC 2& !9DD=?9JG 1 M?D9F< * &=AE<9D 2& (=JJ9E "
.D9FC= 1 .=J=AJ9 #  %GF<O9F9 D9J?= A?F=GMK HJGNAF;=K HD9L= J=;GFKLJM;
LAGFK NGD;9FA; :9KAFK 9F< KADD NGDME=K 'F 'F 1=FK9JE9 1 1LGJ=Q ! #<K *9J?=
'?F=GMK .JGNAF;=K >JGE %GF<O9F9 9F< <B9;=FL 0=?AGFK NGD  %=GDG?Q 1G;A=LQ
G> *GF<GF 1H=;A9D .M:DA;9LAGF
29D:GL !(  &Q<JGL@=JE9D K9DL:ML @GO EM;@ +9J .=LJGD %=GD  U
29D:GL !( 1L9FD=Q 5 1GM: 0 D19<GMF ,  #HAL9PA9D K9DL J==>K 9F< EMK@
JGGEK AF L@= KGML@=JF "=9< 1=9 1=<AE=FLGDG?Q  U
29DO9FA + #D<@GDE -  #NGDMLAGF G> L@= ,GJO=?A9F%J==FD9F< K=9 %=GD 1G;
E MDD  U
29QDGJ 10 +;*=FF9F +  2@= !GFLAF=FL9D !JMKL ALK !GEHGKALAGF 9F< #NGDMLAGF
D9;CO=DD 1;A=FLAV; .M:DA;9LAGFK 3FAL=<1L9L=K U
2=KL=J (5 &GD?9L= &0 JE=DDAFA $( 5=:D=Q . )ADDAD=9 50 &GF? %2
9JF=J &#  1MH=J;JALA;9D O9L=J GPA<9LAGF L=;@FGDG?Q 'F 'F 2=<<=J "5
.G@D9F< $% #<K #E=J?AF? 2=;@FGDG?A=K AF &9R9J<GMK 59KL= +9F9?=E=FL ''' NGD
 E=JA;9F !@=EA;9D 1G;A=LQ HH U
L=F JAFC 31 D8GM:A 1 $DGJ=K !& 0GLKL=AF 7 /9::9FA ' &9J<=J 1& )=DD=J
%0  1=AKEA; AE9?AF? G> <==H DGON=DG;ALQ RGF= :=F=9L@ L@= "=9< 1=9 :9KAF
9F< LJ9FK>GJE >9MDL AEHDA;9LAGFK >GJ KLJ9AF DG;9DAR9LAGF 9F< ;JMKL9D JA?A<ALQ %=GH@QK
0=K *=LL  * @LLHK<GAGJ?%*
2GJKNAC 2& MJC= ) 1L=AF:=J?=J  5=:: 1( K@O9D *"  "A9EGF<K K9E
HD=< :Q HDME=K >JGE L@= ;GJ=E9FLD= :GMF<9JQ ,9LMJ=  U
2GJKNAC 2& 0GMKK= 1 *9:9ADK ! 1E=L@MJKL +   F=O K;@=E= >GJ L@= GH=F
AF? G> L@= 1GML@ LD9FLA; -;=9F 9F< L@= <AKK=;LAGF G> 9F HLA9F K9DL :9KAF %=GH@QK (
'FL  U

UNCORRECTED PROOF
5;2'4*+9'2 '7/4+'4*!+9752+:3+525-> ===  ======
N9F <=F =DL $(% "= G=J .*   K@9DDGO:9KAF EG<=D >GJ K9DAF= ?A9FLK :9K=<
GF AKGKL9KQ<JAN=F KM:KA<=F;= 'F .9GD9 ! ,A;@GDK % 5ADDA9EK # #<K 1=<AE=F
L9JQ .JG;=KK=K #FNAJGFE=FLK 9F< 9KAFK 9 2JA:ML= LG .=L=J $JA=F< 5AD=Q D9;CO=DD
+9D<=F HH U 'FL=JF9LAGF9D KKG;A9LAGF G> 1=<AE=FLGDG?Q 1H=;A9D .M:DA;9
LAGF
4G?=D + $Jü@%J==F %* GK;@A ! 1;@O9JR=F:9;@ #+  1=JH=FLAFAR9LAGF 9F<
WMA<JG;C AFL=J9;LAGF AF (MJ9KKA; E9V; 9F< MDLJ9E9V; K=9WGGJ ;GFKLJ9AFLK >JGE *A?
MJA9F GH@AGDAL= K=IM=F;=K 'F #%3 %=F=J9D KK=E:DQ !GF>=J=F;= :KLJ9;LK NGD 
59DD9;= . F<=JKGF (J 2  4GD9LAD=K AF E9?E9K 'F 1A?MJ<KKGF & &9M?@LGF
 +;,MLL 10 0QE=J & 1LAP ( #<K 2@= #F;Q;DGH=<A9 G> 4GD;9FG=K ;9<=EA;
.J=KK 19F "A=?G HH U
59DDE9FF ) ?@A: $ !9KLJ9<GJA " !AL9 + 1M=KK # %J=AF=JL ( 0A;C=JL " 
1=<AE=FL9LAGF 9F< >GJE9LAGF G> K=;GF<9JQ EAF=J9DK AF L@= @QH=JK9DAF= "AK;GN=JQ
9KAF =9KL=JF +=<AL=JJ9F=9F +9J %=GD  U
59JJ=F ()  #N9HGJAL=K 2@=AJ #NGDMLAGF 9F< #;GFGEA;K D9;CO=DD 1;A=F;= -P
>GJ<
59JJ=F ()  #N9HGJAL=K 1=<AE=FLK 0=KGMJ;=K 9F< &Q<JG;9J:GFK 1HJAF?=J
5üJR:MJ?
59JJ=F ()  #N9HGJAL=K L@JGM?@ LAE= L=;LGFA; ;DAE9LA; 9F< =MKL9LA; ;GFLJGDK AF
E9JAF= 9F< FGFE9JAF= <=HGKALK #9JL@ 1;A 0=N  U
59JJ=F ()  #N9HGJAL=K 9 !GEH=F<AME 31 ,  1HJAF?=J
=JDAF &=A<=D:=J?
59JJ=F ()  19DL MKM9DDQ K=9DK :ML KGE=LAE=K D=9CK AEHDA;9LAGFK >GJ EAF= 9F< ;9N
=JF KL9:ADALA=K AF L@= K@GJL 9F< DGF? L=JE #9JL@ 1;A 0=N  U
5=?=F=J   "A= #FLKL=@MF? <=J )GFLAF=FL= MF< -R=9F= VJKL =< $JA=<JA;@ 4A=O=?
1G@F J9MFK;@O=A?
5=?=F=J   "A= #AFKL=@MF? <=J )GFLAF=FL= MF< -;=9F= L@AJ< =< +=L@M=F *GF
<GF
5=AF:=J?=J 0 =?AF 8  59D<E9FF , %9J<GK@ + 9=J % $JMECAF  5<GOAF
KCA 1  /M9L=JF9JQ JAK= G> L@= K=<GE <A9HAJ "=9< 1=9 9KAF 'F #FR=D 7
?FGF  1L=AF + #<K ,=O $JGFLA=JK AF "=9< 1=9 .9D=G=FNAJGFE=FL9D 0=
K=9J;@ HH U %=GD 1G; E=JA;9 1H=;A9D .9H=J  @LLHK<GAGJ?

5=KL:JGGC %) 0=KLGF 2(  2@= 9;;J=LAGF9JQ ;GEHD=P G> L@= +=<AL=JJ9F=9F
0A<?= L=;LGFA;K WMA< WGO 9F< L@= >GJE9LAGF G> :JAF= D9C=K9F AFLJG<M;LAGF LG L@=
KH=;A9D AKKM= G> +9JAF= %=GDG?Q +9J %=GD  U
5ADKGF (2  "A< L@= LD9FLA; ;DGK= 9F< L@=F J=GH=F ,9LMJ=  U
5ADKGF (2  1L9LA; GJ EG:AD= =9JL@ L@= ;MJJ=FL K;A=FLAV; J=NGDMLAGF .JG; E .@AD
1G;  U
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... The SO 4 2− concentrations observed in the three hot spring waters were substantially lower relative to the calculated concentrations ( Table 2). The depletion in SO 4 2− in seawater-contaminated waters has been ascribed to the microbial reduction (Chapelle and Mcmahon, 1991;Singaraja et al., 2015;) or the precipitation of CaSO 4 minerals, i.e., anhydrite and gypsum (Boluda-Botella et al., 2008;Gomis-Yagues et al., 2000;Hovland et al., 2018;Kuhn et al., 2003;Singaraja et al., 2015). Considering that high temperatures (>100 • C) of the geothermal reservoir are unfavorable for the activity of sulfate-reducing bacteria (George et al., 2008), it is reasonable to infer that high-temperature condition, high SO 4 2− concentration from seawater and the enrichment in Ca 2+ triggered the precipitation of CaSO 4 (Marshall et al., 1964;Power et al., 1966), which led to the depletion in SO 4 2− . ...
... Considering that high temperatures (>100 • C) of the geothermal reservoir are unfavorable for the activity of sulfate-reducing bacteria (George et al., 2008), it is reasonable to infer that high-temperature condition, high SO 4 2− concentration from seawater and the enrichment in Ca 2+ triggered the precipitation of CaSO 4 (Marshall et al., 1964;Power et al., 1966), which led to the depletion in SO 4 2− . Furthermore, though both gypsum and anhydrite have retrograde solubilities, anhydrite has a lower solubility than gypsum at high temperatures (>50 • C) (Hovland et al., 2018;Power et al., 1966), and firstly precipitates from seawater by heating (Hovland et al., 2018;Kuhn et al., 2003), while gypsum in contact with a saline water is converted to natural anhydrite at temperatures above 90.5 • C (Ostroff, 1964). Accordingly, precipitation of anhydrite triggered by the enrichment in Ca 2+ and the increase in temperature was probably the dominant water-rock interaction which caused the depletion in SO 4 2− in the seawater-contaminated hot spring waters. ...
... Considering that high temperatures (>100 • C) of the geothermal reservoir are unfavorable for the activity of sulfate-reducing bacteria (George et al., 2008), it is reasonable to infer that high-temperature condition, high SO 4 2− concentration from seawater and the enrichment in Ca 2+ triggered the precipitation of CaSO 4 (Marshall et al., 1964;Power et al., 1966), which led to the depletion in SO 4 2− . Furthermore, though both gypsum and anhydrite have retrograde solubilities, anhydrite has a lower solubility than gypsum at high temperatures (>50 • C) (Hovland et al., 2018;Power et al., 1966), and firstly precipitates from seawater by heating (Hovland et al., 2018;Kuhn et al., 2003), while gypsum in contact with a saline water is converted to natural anhydrite at temperatures above 90.5 • C (Ostroff, 1964). Accordingly, precipitation of anhydrite triggered by the enrichment in Ca 2+ and the increase in temperature was probably the dominant water-rock interaction which caused the depletion in SO 4 2− in the seawater-contaminated hot spring waters. ...
Article
Temperatures and chemical compositions of hot springs are decisive of their roles in heating, power-generation, therapeutic applications and recreational activities. However, the influence of seawater intrusion on hot springs are still not fully understood. Typical ten hot springs in and around the Anak-Sinchon Uplift in a coastal area of the northern Korean Peninsula were investigated. All the hot springs were near-neutral to weakly alkaline. High TDS value of 25300 mg/L was found at the hot spring closest to the coastline. TDS values, and concentrations of Na⁺, K⁺, Ca²⁺, Cl⁻ and SO4²⁻ in the hot spring waters near the coast showed decreasing trends with the distance from the coastline. According to the calculation of seawater fraction, three hot springs near the coast were contaminated by seawater. Temperatures of the geothermal reservoir were estimated to range from 103 to 170°C, which were interpolated by thin plate spline to predict the local trend of the reservoir temperature distribution. Mg²⁺ concentration was used to determine the time order between the heating process and seawater intrusion. Among the three seawater-contaminated hot springs, very low Mg²⁺ concentrations in two hot spring waters probably indicate that they were mixed with seawater before being heated in the geothermal reservoir and not affected by seawater intrusion again afterwards; relatively high Mg²⁺ concentration in the hot spring water closest to the coastline likely indicates that it was mixed with seawater again during the ascent from the geothermal reservoir. The geochemical modeling performed with PHREEQC indicates that dolomitization of calcite and precipitation of anhydrite were the dominant water-rock interactions for the seawater-contaminated hot spring waters.
... These salt giants were usually accumulated in active tectonic environments (subduction or rift) and accompanied by some magmatic-hydrothermal events, which may occur as parts of "Wilson cycles" 5,6 . Meanwhile, the complicated hydrodynamics, thermodynamics and properties of brines and the processes of solid-liquid phase transformations in these salt giants were different from the traditional salt formation models 5,6,9,10,11 . The current upsurge in the study of evaporite dynamics, the development of new evaporite mechanisms and the ensuing controversies 5,6,8,9,10,11 have led to re-assessment of various roles in salt accumulation. ...
... Meanwhile, the complicated hydrodynamics, thermodynamics and properties of brines and the processes of solid-liquid phase transformations in these salt giants were different from the traditional salt formation models 5,6,9,10,11 . The current upsurge in the study of evaporite dynamics, the development of new evaporite mechanisms and the ensuing controversies 5,6,8,9,10,11 have led to re-assessment of various roles in salt accumulation. Therefore, a new systematic salt accumulation mechanism is eagerly needed for these large salt deposits. ...
... In spite of the intervals between the LIPs and LEPs, there might be positively promoting effect to accumulation of the LEPs from the LIPs. Recently, Hovland et al. 5,6 suggested a model of large salt accumulation based on hydrothermal processes within Wilson cycles and proposed that solid salt was easily formed in subduction and rifting tectonic environments, such as the Andean subduction zone (oceanic-continental subduction), the Mediterranean ridge subduction zone (oceanic-oceanic subduction), and the East African and Rea Sea rifts. This is consistent with our analysis of statistic data of distributions, masses, and salt-forming rates of evaporite deposits in the world. ...
Preprint
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Large evaporite provinces (LEPs) represent prodigious volumes of evaporites widely developed from the Sinian to Neogene. The reasons why they often quickly develop on a large scale with large areas and thicknesses remain enigmatic. Possible causes range from warming from above to heating from below. The fact that the salt deposits in most salt-bearing basins occur mainly in the Sinian-Cambrian, Permian-Triassic, Jurassic-Cretaceous, and Miocene intervals favours a dominantly tectonic origin rather than a solar driving mechanism. Here, we analysed the spatio-temporal distribution of evaporites based on 138 evaporitic basins and found that throughout the Phanerozoiceon, LEPs occurred across the Earth’s surface in most salt-bearing basins, especially in areas with an evolutionary history of strong tectonic activity. The masses of evaporites, rates of evaporite formation, tectonic movements, and large igneous provinces (LIPs) synergistically developed in the Sinian-Cambrian, Permian, Jurassic-Cretaceous, and Miocene intervals, which are considered to be four of the warmest times since the Sinian. We realize that salt accumulation can proceed without solar energy and can generally be linked to geothermal changes in tectonically active zones. When climatic factors are involved, they may be manifestations of the thermal influence of the crust on the surface.
... These salt giants were usually accumulated in active tectonic environments (subduction or rift) and accompanied by some magmatic-hydrothermal events, which may occur as parts of "Wilson cycles" 5,6 . Meanwhile, the complicated hydrodynamics, thermodynamics and properties of brines and the processes of solid-liquid phase transformations in these salt giants were different from the traditional salt formation models 5,6,9,10,11 . The current upsurge in the study of evaporite dynamics, the development of new evaporite mechanisms and the ensuing controversies 5,6,8,9,10,11 have led to re-assessment of various roles in salt accumulation. ...
... Meanwhile, the complicated hydrodynamics, thermodynamics and properties of brines and the processes of solid-liquid phase transformations in these salt giants were different from the traditional salt formation models 5,6,9,10,11 . The current upsurge in the study of evaporite dynamics, the development of new evaporite mechanisms and the ensuing controversies 5,6,8,9,10,11 have led to re-assessment of various roles in salt accumulation. Therefore, a new systematic salt accumulation mechanism is eagerly needed for these large salt deposits. ...
... In spite of the intervals between the LIPs and LEPs, there might be positively promoting effect to accumulation of the LEPs from the LIPs. Recently, Hovland et al. 5,6 suggested a model of large salt accumulation based on hydrothermal processes within Wilson cycles and proposed that solid salt was easily formed in subduction and rifting tectonic environments, such as the Andean subduction zone (oceanic-continental subduction), the Mediterranean ridge subduction zone (oceanic-oceanic subduction), and the East African and Rea Sea rifts. This is consistent with our analysis of statistic data of distributions, masses, and salt-forming rates of evaporite deposits in the world. ...
Preprint
Full-text available
Large evaporite provinces (LEPs) represent prodigious volumes of evaporites widely developed from the Sinian to Neogene. The reasons why they often quickly develop on a large scale with large areas and thicknesses remain enigmatic. Possible causes range from warming from above to heating from below. The fact that the salt deposits in most salt-bearing basins occur mainly in the Sinian-Cambrian, Permian-Triassic, Jurassic-Cretaceous, and Miocene intervals favours a dominantly tectonic origin rather than a solar driving mechanism. Here, we analysed the spatio-temporal distribution of evaporites based on 138 evaporitic basins and found that throughout the Phanerozoiceon, LEPs occurred across the Earth’s surface in most salt-bearing basins, especially in areas with an evolutionary history of strong tectonic activity. The masses of evaporites, rates of evaporite formation, tectonic movements, and large igneous provinces (LIPs) synergistically developed in the Sinian-Cambrian, Permian, Jurassic-Cretaceous, and Miocene intervals, which are considered to be four of the warmest times since the Sinian. We realize that salt accumulation can proceed without solar energy and can generally be linked to geothermal changes in tectonically active zones. When climatic factors are involved, they may be manifestations of the thermal influence of the crust on the surface.
... There is extensive discussion about the extent to which these DHABs were formed by leaching of tectonically exhumed halite or by release of relic brines trapped within the evaporites (Vengosh et al., 1998;Camerlenghi, 1990;Cita, 2006), or supercritical heating at great depth of seawater resulting in hydrothermally formed salts and brines (Hovland et al., 2018), with the diverse sources of the brines resulting in distinct chemistries ( Table 1). ...
... The source of the brine is underlying evaporites (deposited in the Mediterranean basin during the Messinian Salinity Crisis 5.97 to 5.32 million years ago), mostly from the acme evaporitic stage (5.60 to 5.55 MYA), which has thick beds of halite with associated minerals (Roveri et al., 2004). However, hydrothermally-derived salt and brine has also been proposed as an alternative source (Hovland et al., 2018). ...
Article
Several icy moons of the outer solar system have been receiving considerable attention and are currently seen as major targets for astrobiological research and the search for life beyond our planet. Despite the limited amount of data on the oceans of these moon, we expect them to be composed of brines with variable chemistry, some degree of hydrothermal input, and be under high pressure conditions. The combination of these different conditions significantly limits the number of extreme locations, which can be used as terrestrial analogues. Here we propose the use of deep-sea brines as potential terrestrial analogues to the oceans in the outer solar system. We provide an overview of what is currently known about the conditions on the icy moons of the outer solar system and their oceans as well as on deep-sea brines of the Red Sea and the Mediterranean and their microbiology. We also identify several threads of future research, which would be particularly useful in the context of future exploration of these extra-terrestrial oceans.
... There is extensive discussion about the extent to which these DHABs were formed by leaching of tectonically exhumed halite or by release of relic brines trapped within the evaporites (Vengosh et al., 1998;Camerlenghi, 1990;Cita, 2006), or supercritical heating at great depth of seawater resulting in hydrothermally formed salts and brines (Hovland et al., 2018), with the diverse sources of the brines resulting in distinct chemistries ( Table 1). ...
... The source of the brine is underlying evaporites (deposited in the Mediterranean basin during the Messinian Salinity Crisis 5.97 to 5.32 million years ago), mostly from the acme evaporitic stage (5.60 to 5.55 MYA), which has thick beds of halite with associated minerals (Roveri et al., 2004). However, hydrothermally-derived salt and brine has also been proposed as an alternative source (Hovland et al., 2018). ...
... This would leave behind a salt enriched in halite relative to seawater. Additionally, Hovland et al. (2018a) noted that when volcanic gases like CO2 and SO2 are exposed to the brine, new carbonate and sulfate salts may form. Even though CO2 is the dominant gas released from the Lower Cone, SO2 is also present at depth (evidenced by disproportionation products on and immediately below the sea floor) and may have reacted as it rose from the magma to the sea floor because it is more soluble than CO2 . ...
Article
Hydrothermal vent fluids from Brothers submarine arc volcano were previously collected in 2004, 2005, and 2017. We present new data from 2018 along with a unique time series of a submarine volcano hosting two distinct types of hydrothermal venting to better understand subsurface processes and how they evolve over time. Samples were collected from known venting locations along the NW Caldera, the Upper and Lower Cone sites, and the newly sampled Upper Caldera site. The NW Caldera wall and Upper Caldera vent fluid compositions are controlled by high-temperature water-rock interactions and phase separation between 2004 and 2018. Fe/Mn molar values suggest that the magmatic impact on all fields has been increasing over time. The Upper Cone has varying influences, including short term pulses of magmatic degassing, as revealed in K-Mg-SO4 ternary diagrams, Fe/Mn values, and δD and δ18O data. The Lower Cone is dominated by low temperatures and CO2 degassing and shows a pulse in magmatic influence in 2017, followed by a decrease toward earlier conditions in 2018. The 2017 pulse was accompanied by the increase of an enigmatic, soluble MgSO4 phase, potentially due to the “mining” of a magmatic brine sequestered inside the cone. Stable isotope data across the sites indicate pulses of magmatic waters in 2004 and 2017, immediately followed by episodes of more seawater-dominated fluids in 2005 and 2018. Magmatic degassing, phase separation, permeability, and mineral solubility all strongly influence changes in vent fluid composition. This study highlights the dynamic nature of the Brothers volcano hydrothermal system and the changes in fluid chemistry that may affect resultant mineralization.
... There are also alternative models for the origin of salt giants. Hovland et al. (2006, Hovland et al., 2018discussed deep salt formation by supercritical fluids. Scribano et al. (2017) proposed that salt giants formed not as seawater evaporated, but as it was consumed by serpentinization of lithospheric mantle. ...
Article
The discovery and production, by Petrobras, of over 50 billion barrels in place of pre-salt oil in Brazil's offshore South Atlantic Santos and Campos basins has drawn worldwide attention to its km-thick Cretaceous salt seal since 2007. However, the depth of the pre-salt reservoir in these basins make prohibitive the costs of continuous coring or even extensive logging of the salt. The salt seal of the Santos and Campos basins forms part of the Cretaceous South Atlantic salt giant, the largest in the world, now divided between Brazil and southwestern Africa. Although our petrographic study is concentrated north of the Santos and Campos basins, we nevertheless discuss the age, facies, tectonic-paleogeographic controls and evolution of the entire Brazilian salt giant. Offshore Brazil, salt extends for 2.200 km from the Sergipe Basin in the northeast to the Santos Basin in the southwest. The Sergipe Basin at its NE end displays the full spectrum of evaporite cycles, spanning from carbonates, anhydrites and halites to the highly soluble hydrated Mg-chlorides carnallite, bischoffite and tachyhydrite, as does the Santos Basin in the SW part of the salt giant. The deposition of Mg-chlorides was terminated in Sergipe by an intra-salt unconformity at the carnallite/sylvinite contact, dated as 110.64 ± 0.34 Ma. In the intervening Espírito Santo and Campos basins, these highly soluble salts are absent. Onshore Sergipe and Espírito Santo basins the entire salt sequence has been cored in several wells, including the highly soluble Mg–K–Ca chlorides. Here, we analyze the petrography and chemistry of cores in Sergipe and Espírito Santo. We prove the presence of tachyhydrite beds at both ends of the salt giant in the Sergipe and Santos basins, but not in between the two basins. By comparing the presence of tachyhydrite beds in Brazil with similar evaporite sequences of similar age in Thailand, we defend that the high Ca/Mg and Ca/SO4 ratios in Cretaceous seawater was the de facto cause for tachyhydrite deposition in both regions. Ca/Mg and Ca/SO4 ratios of global seawater were raised by hydrothermal activity over basalts produced at exceptionally high rates in the Aptian along new mid-oceanic ridges and in oceanic plateaus such as Ontong-Java. This exceptionally high activity may be related to the change of the thermochemical conditions across the core-mantle boundary that stabilized the Cretaceous Normal Superchron for nearly 40 Ma, from 123.4 to 121.2 Ma (2σ). to 83.07 ± 0.15 Ma (2σ) Ma. Aptian volcanic activity In the South Atlantic formed the Rio Grande Rise - Walvis Ridge that was the southern barrier of the salt basin, lava flows on the São Paulo Plateau and basalts along the developing South Atlantic Ridge. Evaporite facies reflect cyclic changes on all scales when concentrating the depositing brines. We therefore analyze the effect of increases in brine concentration on the formation of salt crystals throughout multiple depositional cycles. In the later stages of the Brazilian salt basins, increased inflow of seawater from the Central Atlantic Ocean along the Equatorial rift basins enlarged and deepened the existent brine lake while its salinity, and especially its Ca and Mg contents, dropped. Flooding by this less concentrated brine created an unconformity, leaching Mg and Ca from the carnallite and tachyhydrite previously deposited, and replacing these with secondary sylvinite. Our results can be applied to the essentially uncored salt sequence of the Campos and Santos basins, where igneous and hydrothermal activity provided additional sources of calcium. The Ca excess may have been increased still further by serpentinization of lithospheric mantle beneath hyperextended crust and by percolation of seawater through mafic rocks of the proto-Rio Grande Rise – Walvis Ridge that formed the southern barrier of the salt basin.
... Recent studies have suggested that serpentinization in closed systems provides a mechanism to concentrate salts and generate NaCl-MgCl 2 -rich brines that can lead to the formation of seemingly inexplicable occurrences of salt in deep-water rift basins that were never desiccated (e.g. Red Sea and the Mediterranean Sea) (Scribano et al., 2017;Hovland et al., 2018bHovland et al., , 2018aHovland et al., , 2019Manuella et al., 2018;Scribano et al., 2018;Aftabi and Atapour, 2018;Debure et al., 2019). However, such high salinity brines are yet to be seen in active hydrothermal systems hosted by abyssal peridotites. ...
Article
Serpentinization, i.e. the hydrothermal alteration of ultramafic rocks, is an important and ubiquitous geologic process that occurs at slow- and ultraslow-spreading mid-ocean ridges, magma-poor passive margins, and subduction zones. While serpentinization occurs over a wide temperature range and involves diverse fluid compositions, few experimental studies systematically examined the effects of temperature and fluid composition on the kinetics of serpentinization of olivine, and published rates diverge greatly. We present results of an experimental study using synthetic fluid inclusions in Mg-rich olivine as micro batch reactors to monitor the effects of temperature (100 ° to 350 °C), fluid composition (H2O-MgCl-NaCl, H2O-NaCl, H2O-MgCl), and total salinity on serpentinization rates of olivine under closed system conditions. Petrographic observations and Raman analyses of the experimental run products revealed the alteration of olivine to produce serpentine minerals, brucite, and magnetite. The salinity of the aqueous fluid in the inclusions increased as H2O was removed from the solution and incorporated into the hydrous product phases and served as a proxy for reaction progress. The fastest serpentinization rates were found at 250 °C in the presence of a seawater-like aqueous solution. This result further suggests that serpentinization of olivine is fastest at lower temperatures (∼250 °C) and shallower depths in the oceanic lithosphere than suggested by previous studies (∼300 °C). Moreover, our experiments show that serpentinization rates decrease by several orders of magnitude as salinity and the concentration of dissolved Mg increase. These effects may reconcile some of the differences observed when comparing results of previously published rates obtained from experiments involving fluids of different compositions. We constructed a quantitative model based on the principle of detailed balance to predict variations in serpentinization rates (J±) from low temperatures to 320 °C. It suggests that at 25 °C, serpentinization rates are 4 to 5 orders of magnitude slower than at 250 °C. Moreover, the temperature dependence model has been coupled with the kinetic effects derived from experiments involving different fluid composition to calculate the amount of time required for serpentinization of olivine having different reactive surface areas. The model shows that between 200 and 300 °C serpentinization is fast on geologic timescales when rocks with large reactive surface areas interact with a seawater-like aqueous solution (complete serpentinization in days to decades).
Technical Report
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The main objective of this communication is to describe the magmatic 'Global Salt Cycle', 8 an important addition to solar evaporative processes in the formation of salt giants. The Global Salt 9 Cycle (GSC) provides an alternative explanation for the observed volumes and composition of salts, 10 at the location where they are observed. The first stage in the GSC is saturation of oceanic crust and 11 sediments with seawater. Subduction of oceanic crust and serpentinized lithosphere transports 12 water, hydrated minerals, and marine salts deep into the crust and mantle. Upon pressurization and 13 heating of the subducting slab, different parts of this water are expelled at different 14 depths/temperatures. The resulting fluids will contain salts brought in with the slab, as well as 15 minerals and new salts formed by water-rock interaction. The main transport mechanisms bringing 16 mantle fluids closer to the surface, is upwelling of the mantle itself, followed by fluid exsolution. 17 Any tectonic processes that involve upwelling of fluid-invaded mantle or escape of fluids from it, 18 i.e., subduction processes, rifting of continental crust, back arc rifting above active subduction zones, 19 mantle upwelling and lithospheric extension above retreating subduction zones, and mantle 20 upwelling creating intracratonic basins, may potentially lead to deposition of solid salt. The global 21 extent of the processes involved in salt formation included in the GSC concept, is substantiated with 22 information and data included in four appendices (Additional Material). 23
Preprint
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The main objective of this communication is to describe the ‘Global Salt Cycle’. Giant salt accumulations are commonly found along continental margins of former rifts. The first stage in the accumulation process is saturation of newly formed oceanic crust with seawater. Final mobilisation and accumulation of the salts occurs during rifting, localised in the vicinity of relict subduction zones. Oceanic crust is created along the spreading ridges in the deep oceans of the Earth. It exchanges mass and energy with seawater in hydrothermal circulation cells that penetrate deep into the new and fractured crust. Water-rock interactions include the formation of hydrated and hydroxylated minerals, e.g., serpentinites and clay minerals. By incorporating hydroxyl groups and water in their crystal lattices, the salinity of remaining brines increases. Subduction of oceanic crust and serpentinised lithosphere transports water, hydrated minerals, and marine salts deep into the crust and mantle. Upon pressurisation and heating of the subducting slab, different parts of this water are expelled at different depths/temperatures. The resulting fluids will contain salts brought in with the slab, as well as new salts formed by water-rock interaction. The combination of elevated pressures and temperatures, water, salinity, and CO2, create permeability in the normally impermeable, peridotitic mantle, by altering the fluid-rock dihedral angles of mineral grains. This P/T-determined intergranular permeability allows ascent of saline fluids, under lithostatic pressure, within the mantle wedge, or the slab itself. The fluids produce a mechanically weakened and buoyant zone within the mantle wedge due to high pore pressure between mineral grains and reduced mantle density. During the lifetime of a subduction zone, a substantial accumulation of saline fluids within the mantle wedge and crust, is evident. Deep, fluid reservoirs accumulate between the subduction trench and the volcanic front. They may exist for hundreds of millions of years, even after the extinction of the subduction zone. Saline fluids may escape to the surface along deep faults, due to overfilling of available pores/fractures. Fluids within the mantle wedge may form rock melts or exist as supercritical, mineral rich fluids. The combination of reduced pressure due to rifting, and a saline and buoyant mantle, creates a mantle circulation that brings the accumulated, saline fluids, to crustal levels. Salts will therefore accumulate during initial stages of rifting as a result of massive fluid expulsion, phase change and boiling of mantle fluids. No extra energy is required to produce phase change and boiling. The result is formation of solid salts or dense brines/slurries invading fractured crustal rocks, or escaping to the surface/seabed. This process may take place both before and after the sea has invaded a continental rift.
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Gondwana was an enormous supertarrane. At its peak, it represented a landmass of about 100 × 10⁶ km² in size, corresponding to approximately 64% of all land areas today. Gondwana assembled in the Middle Cambrian, merged with Laurussia to form Pangea in the Carboniferous, and finally disintegrated with the separation of East and West Gondwana at about 170 Ma, and the separation of Africa and South America around 130 Ma. Here we have updated plate reconstructions from Gondwana history, with a special emphasis on the interactions between the continental crust of Gondwana and the mantle plumes resulting in Large Igneous Provinces (LIPs) at its surface. Moreover, we present an overview of the subvolcanic parts of the Gondwana LIPs (Kalkarindji, Central Atlantic Magmatic Province, Karoo and the Paraná-Etendeka) aimed at summarizing our current understanding of timings, scale and impact of these provinces. The Central Atlantic Magmatic Province (CAMP) reveals a conservative volume estimate of 700 000 km³ of subvolcanic intrusions, emplaced in the Brazilian sedimentary basins (58-66% of the total CAMP sill volume). The detailed evolution and melt-flux estimates for the CAMP and Gondwana-related LIPs are, however, poorly constrained, as they are not yet sufficiently explored with high-precision U-Pb geochronology.
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The omnipresence of lithium-ion batteries in mobile electronics, and hybrid and electric vehicles necessitates discovery of new lithium resources to meet rising demand and to diversify the global lithium supply chain. Here we demonstrate that lake sediments preserved within intracontinental rhyolitic calderas formed on eruption and weathering of lithium-enriched magmas have the potential to host large lithium clay deposits. We compare lithium concentrations of magmas formed in a variety of tectonic settings using in situ trace-element measurements of quartz-hosted melt inclusions to demonstrate that moderate to extreme lithium enrichment occurs in magmas that incorporate felsic continental crust. Cenozoic calderas in western North America and in other intracontinental settings that generated such magmas are promising new targets for lithium exploration because lithium leached from the eruptive products by meteoric and hydrothermal fluids becomes concentrated in clays within caldera lake sediments to potentially economically extractable levels.
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One of the probable mechanisms that controls the composition of highly mineralized chloride groundwaters is studied using physicochemical numerical simulations of equilibria in water–rock systems. Concentrated brines in the Olenek cryoartesian basin in the northeastern Siberian Platform are determined to be undersaturated with respect of major rock-forming minerals, which suggests that the metamorphosed sedimentary brines should have been diluted by meteoric waters during a certain evolutionary episode of the permafrost zone of the basin in the Late Pleistocene and Holocene.
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Worldwide marine salt deposits ranging over the entire geological record are generally considered climate-related evaporites, derived from the precipitation of salts (mainly chlorides and sulfates) from saturated solutions driven by solar evaporation of seawater. This explanation may be realistic for a salt thickness ≤ 100 m, being therefore inadequate for thicker (> 1 km) deposits. Moreover, sub-seafloor salt deposits in deep marine basins are difficult to reconcile with a surface evaporation model. Marine geology reports on abyssal serpentinite systems provide an alternative explanation for some salt deposits. Seawater-driven serpentinization consumes water and increases the salinity of the associated aqueous brines. Brines can be trapped in fractures and cavities in serpentinites and the surrounding ‘country’ rocks. Successive thermal dehydration of buried serpentinites can mobilize and accumulate the brines, forming highly saline hydrothermal solutions. These can migrate upwards and erupt onto the seafloor as saline geysers, which may form salt-saturated water pools, as are currently observed in numerous deeps in the Red Sea and elsewhere. The drainage of deep-seated saline brines to seafloor may be a long-lasting, effective process, mainly occurring in areas characterized by strong tectonic stresses and/or igneous intrusions. Alternatively, brines could be slowly expelled from fractured serpentinites by buoyancy gradients, and hence separated salts/brines could intrude vertically into surrounding rocks, forming salt diapirs. Serpentinizzation is an ubiquitous, long-lasting process throughout geological times with no demand for an external energy source. It is therefore reasonable to recognize the existence of buried, serpentinite-related salt deposits in many areas of the world.
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The Messinian salinity crisis (MSC) is perceived as an environmental crisis governed by climatic and tectonic controls, affecting global oceans’ salinity and shaping the Mediterranean Sea’s biochemical composition. Recently drilled offshore wells in the Levant Basin retrieved a sedimentary record of the deep-basin Mediterranean MSC salt deposits and the underlying pre-evaporite unit. In this study, we have concentrated on the pre-evaporite interval and its transition into the overlying evaporites. Analysis of this data set changes the way these deposits have been perceived since the 1970s, when they were first penetrated in their uppermost part during Deep Sea Drilling Project expeditions. Using sedimentology, seismic interpretation, biostratigraphy, and astronomical tuning, we show that Messinian salt deposition in the Eastern Mediterranean began during stage 1 of the MSC. In contrast to the present paradigm, salt was deposited synchronously with gypsum in the marginal and intermediate-depth basins significantly before the 50 k.y. interval coined as the “MSC acme event”, ~400 k.y. after the crisis began. Thus salt precipitation took place in a non-desiccated deep basin, having a restricted but often open connection with the Atlantic Ocean, substantially altering our understanding of the mechanisms governing the deposition of salt giants. A coeval onset of basinal halite and marginal gypsum precipitation calls for a revaluation of global-scale climatic and oceanographic models of the MSC, taking into account a much older age for the beginning of halite deposition.
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The Dead Sea transform is an active plate boundary connecting the Red Sea seafloor spreading system to the Arabian-Eurasian continental collision zone. Its geology and geophysics provide a natural laboratory for investigation of the surficial, crustal and mantle processes occurring along transtensional and transpressional transform fault domains on a lithospheric scale and related to continental breakup. There have been many detailed and disciplinary studies of the Dead Sea transform fault zone during the last 20 years and this book brings them together. This book is an updated comprehensive coverage of the knowledge, based on recent studies of the tectonics, structure, geophysics, volcanism, active tectonics, sedimentology and paleo and modern climate of the Dead Sea transform fault zone. It puts together all this new information and knowledge in a coherent fashion.
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The Red Sea is an unusual example of a rift basin that transitioned from its evaporitic stage to fully open-ocean conditions at the end of the Miocene (∼5.3 Ma), much more recently than older Mesozoic margins around the Atlantic and Gulf of Mexico. The patterns of halokinetic deformation occurring in the Red Sea are potentially of interest for understanding more generally how evaporite deposits deform during this early stage. Relevant to this issue, a line of reconnaissance sidescan sonar data (GLORIA) collected along the Red Sea in 1979 is re-evaluated here. We first interpret the data with the aid of newly compiled bathymetry from multibeam sonars in the central and southern Red Sea. Features in the acoustic backscatter data are associated with ridges, valleys and rounded flow fronts produced by halokinetic deformation. Some areas of higher acoustic backscattering from the evaporites are suggested to relate to roughness produced by deformation of the evaporite surface. Within the volcanic (oceanic) axial valleys, areas of differing high and low backscattering suggest varied sediment cover and/or carbonate encrustations. With the benefit of the above experience, we then interpreted data from the northern Red Sea, where there are fewer multibeam data available. Rounded fronts of halokinetic deformation are present in the Zabargad Fracture Zone, a broad, shallow valley crossing the Red Sea obliquely. The presence of halokinetic deformation here is evidence that subsidence has occurred along the fracture zone. Elsewhere in the northern Red Sea, the GLORIA data reveal folds in the evaporite surface, suggesting local areas of convergence, like those implied by multibeam data from inter-trough zones further south. Some linear features are observed, many of which are likely to be ridges overlying salt walls. Interestingly, several such features are oriented along an accommodation zone that is oriented parallel to the plate spreading direction. Several rounded, corrugated features are interpreted as possible evaporite flow fronts. Overall, the impression from the data is of a strongly mobile seabed in the Red Sea because of halokinetic deformation, involving both vertical and horizontal movements. However, salt walls appear more common than in the central and southern axial Red Sea, where horizontal movements instead tend to dominate.
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Serpentinisation of mantle rocks requires the generation and maintenance of transport pathways for water. The solid volume increase during serpentinisation can lead to stress build-up and trigger cracking, which ease fluid penetration into the rock. The quantitative effect of this reaction-induced cracking mechanism on reactive surface generation is poorly constrained, thus hampering our ability to predict serpentinisation rate in geological environments. Here we use a combined approach with numerical modelling and observations in natural samples to provide estimates of serpentinisation rate at mid-ocean ridges. We develop a micromechanical model to quantify the propagation of serpentinisation-induced cracks in olivine. The maximum crystallisation pressure deduced from thermodynamic calculations reaches several hundreds of megapascals but does not necessary lead to crack propagation if the olivine grain is subjected to high compressive stresses. The micromechanical model is then coupled to a simple geometrical model to predict reactive surface area formation during grain splitting, and thus bulk reaction rate. Our model reproduces quantitatively experimental kinetic data and the typical mesh texture formed during serpentinisation. We also compare the model results with olivine grain size distribution data obtained on natural serpentinised peridotites from the Marum ophiolite and the Papuan ultramafic belt (Papua New Guinea). The natural serpentinised peridotites show an increase of the number of olivine grains for a decrease of the mean grain size by one order of magnitude as reaction progresses from 5 to 40%. These results are in agreement with our model predictions, suggesting that reaction-induced cracking controls the serpentinisation rate. We use our model to estimate that, at mid-ocean ridges, serpentinisation occurs up to 12 km depth and reaction-induced cracking reduces the characteristic time of serpentinisation by one order of magnitude, down to values comprised between 10 and 1000 yr. The increase of effective pressure with depth also prevents cracking, which positions the peak in serpentinisation rate at shallower depths, 4 km above previous predictions.
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Foreword by Peter A. Cawood Acknowledgements. 1. Water and hydrothermal fluids on Earth 2. Hydrothermal processes and wall rock alteration 3. Tectonic settings, geodynamics and temporal evolution of hydrothermal mineral systems 4. Intrusion-related hydrothermal mineral systems 5. Porphyry systems fossil and active epithermal systems 6. Skarn systems 7. Submarine hydrothermal mineral systems 8. Metalliferous sediments and sedimentary rock-hosted stratiform and/or stratabound hydrothermal mineral systems 9. Orogenic, amagmatic and hydrothermal mineral systems of uncertain origin 10. Hydrothermal systems and the biosphere 11. Hydrothermal processes associated with meteorite impacts 12. Hydrothermal processes and systems on other planets and satellites 13. Uranium hydrothermal mineral systems References. Index