Jochen E. Mezger- Ph.D.
- Professor (Assistant) at University of Alaska Fairbanks
Jochen E. Mezger
- Ph.D.
- Professor (Assistant) at University of Alaska Fairbanks
About
57
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Introduction
Current institution
Additional affiliations
January 2013 - present
November 2003 - November 2012
March 1998 - June 2001
Publications
Publications (57)
Laser ablation U–Pb single zircon geochronology was applied to four peraluminous granite and granodiorite samples from the Bassiès pluton in the Central Pyrenees (France) yielding a wide range of concordant ages from early Carboniferous (Tournaisian, 351 Ma) to early Permian (Artinskian, 285 Ma). Emplacement of the Bassiès pluton occurred increment...
Alkaline granitic dikes intruding the metasedimentary mantle and orthogneiss cores of the Aston and Hospitalet domes of the Axial Zone of the Pyrenees are subjects of a laser ablation ICP-MS U-Pb zircon geochronology study. The age spectra recorded by detrital, magmatic xenocrystic and inherited zircons reveal a more complex, nearly continuous Pale...
Poster presentation at GSA 2019, Phoenix, Arizona. Poster session D32: Recent advances in Structural Geology
Petrographic sections, cathodoluminescence and fluorescence images of deformed belemnites from central Alaska (Talkeetna Mountains)
Stretched belemnites" have long been used in tectonic studies to determine extension by measuring the elongation of their rod-shaped guards. Evidence for compression, on the other hand, has not yet been reported from belemnite fossils. In calcareous mudstone from the Lower Cretaceous of the Talkeetna Mts., central Alaska, belemnite rostra of the sp...
Contractionally deformed (i.e. sheared and folded) belemnites have been found in calcareous mudstone in the Talkeetna Mts. Conspicuously absent in the structural geology literature, the poster shows high resolution images and sketches of deformed belemnite fragments. Microphotographs of thin sections are presented. The outcrop conditions, which are...
Laser ablation U-Pb and Th-Pb single zircon and monazite geochronology was applied to seven samples from two Variscan gneiss domes in the central Pyrenean Axial Zone. Detrital zircon ages obtained from a paragneiss in the western Aston dome range from Neoarchean (ca. 2.57 Ga) to Late Neoproterozoic (ca. 560 Ma), suggesting that late Ediacaran sedim...
Presents LA-U-Pb new zircon ages of deep-seated granites in the Central Axial Zone of the Pyrenees. Granites in the core of the Aston and Bossòst domes were emplaced at ca. 339 Ma, and are 35 Myr older than the prominent granite plutons (Bassiès, Mt. Louis-Andorra, etc.). Poster attempts to provide plate tectonic explanation for Visean magmatism.
The origin of the Messel fossil deposit (UNESCO world heritage site) for a long time had been a matter of conjecture. A scientifi c well fi nally proved that the Messel Lake is the result of phreatomagmatic eruptions. Intrabasin faults and folded oil shale within the pit still remained unexplained, suggesting structural control on basin development...
Staurolite- and cordierite-bearing rocks are generally considered to be the result of polymetamorphism, e.g. medium to high pressure regional metamorphism followed by a low pressure-high temperature thermal event (Pattison et al. 1999; Mezger et al. 2004). Staurolite-andalusite-cordierite schist are common in the Aston and Hospitalet domes of the A...
Photomicrographs, pseudosections and AFM diagrams describe the prograde metamorphism of metasedimentary rocks of the western Aston and Hospitalet domes (Central Pyrenees) and relate it to the Visean (ca. 339 Ma) intrusion of the Soulcem granite and the development of the main flat-lying S2 schistosity. It concludes that main deformation and high te...
Die Mérens-Scher-und -Störungszone (MSFZ) ist ein bedeutendes orogen-paralleles Strukturelement innerhalb der variszischen Kernzone der Zentralpyrenäen. Entlang einer Gesamtlänge von 70 km verläuft sie durch Gesteine unterschiedlicher Festigkeit. Die Ausbildung der MSFZ wird beeinflusst durch den Kompetenzkontrast der durchschnittenen Gesteine, sow...
In a mica schist unit of the Bossòst dome (Central Pyrenees, Spain) idioblastic interkinematic staurolite porphyroblasts with straight inclusion trails (Si) have rotated with respect to the main schistosity in the same sense by different amounts. Orientation data of 600 porphyroblasts were obtained from planes parallel to stretching lineation (xz),...
Monoclinic shape fabrics and inclusion trail geometries of porphyroblasts are regarded as reliable shear-sense indicators, provided that timing and sequence of growth can be established. In the southern Bossòst dome of the Central Pyrenees, staurolite and cordierite porphyroblasts in mica schists contain inclusion trails oblique to, but continuous...
LA U-Pb single zircon geochronology of granites, orthogneisses, tonalites and paragneiss from the Bossòst and Aston domes of the Central Pyrenees. Tera-Wasserburg diagrams and CL images of analysed zircons are presented.
Structural and geological maps of the Mérens shear and fault zone, Central Axial Zone in the French and Andorran Pyrenees. Maps cover a 45 km stretch from the Soulcem valley in the West and the Ariège valley in the East.
The second poster that discusses the rotation of staurolite dependent on their initial pre-deformation growth orientation. Samples from the Bossòst Dome, Central Pyrenees. This led to the 2010 paper in the Journal of Structural Geology (32: 1147-1157).
The Variscan basement of the Axial Zone is exposed at four different structural levels in two mantled gneiss
domes of the Central Pyrenees. The Aston-Hospitalet dome reflects the deepest levels and is cored by large orthogneiss massifs. The Bossòst dome further west possesses a central Variscan granitoid pluton and represents the upper crustal leve...
The late Mesozoic and Cenozoic metamorphic evolution of the western North American continental margin is recorded in a belt of homogeneous metapelitic rocks, the Kluane metamorphic assemblage (KMA), in the northern Coast Belt of Yukon Territory. A record of Late Cretaceous medium-pressure and -temperature (c. 7 kbar, 500 °C) metamorphism, M1, is pr...
The basement of the Variscan Axial Zone of the Pyrenees is exposed at four different levels in two elliptical gneiss dome pairs, the Bossòst and the Aston-Hospitalet domes. Microstructural analyses of augengneisses of the dome core and metasedimentary rocks of the mantle reveal that the main Variscan deformation phases reflect an overall compressio...
Structural data and shear sense indicators of orthogneiss and mica schist of the Aston/Hospitalet and Bossòst domes suggest that compressional tectonics dominated the main Variscan deformation in the Pyrenees. Ascending rigid orthogneiss cores or emplacement of plutons resulted in strain accumulation at their roof and in the less competent metasedi...
My first poster that discusses the rotation of staurolite dependent on their initial pre-deformation growth orientation. Samples from the Bossòst Dome, Central Pyrenees. This led to the 2010 paper in the Journal of Structural Geology (32: 1147-1157).
The tectonic setting of the southern Menderes Massif, part of the western Anatolide belt in western Turkey, is characterized by the exhumation of deeper crustal levels onto the upper crust during the Eocene. The lowermost tectonic units of the Menderes Massif are exposed in the Çine Massif, where Proterozoic basement orthogneisses of the Çine nappe...
The Bossòst and the western Aston-Hospitalet structural and metamorphic domes have similar metamorphic characteristics. Textural observations show garnet and staurolite as earlier phases, andalusite, cordierite and sillimanite as later phases. Metastable staurolite-cordierite-biotite-muscovite assemblages found in both domes indicate a decompressio...
A kilometre-scale shear zone is recognized in the Cambro-Ordovician schist of the Bossòst dome, a Variscan metamorphic and structural dome in the Axial Zone of the central Pyrenees. Non-coaxial deformation is recorded by rotated garnet and staurolite porphyroblasts following regional metamorphism M1, while coaxial conditions prevailed during later...
In an interesting contribution to the geological development of the central Axial Zone of the Pyrenees, Souquet et al. (2003) propose a number of new ideas on the local tectonics. That the existence of an early Late Devonian (Frasnian) foreland basin system within the Hercynian
Axial Zone of the Central Pyrenees, developed in front of a southward p...
A kilometre-scale shear zone is recognized in the Cambro–Ordovician schist of the Bossòst dome, a Variscan metamorphic and structural dome in the Axial Zone of the central Pyrenees. Non-coaxial deformation is recorded by rotated garnet and staurolite porphyroblasts following regional metamorphism M1, while coaxial conditions prevailed during later...
The Bossòst dome is an EW-trending doubly plunging antiform with granitic sills and dykes in the core to the south. The main foliation is a flat-lying S1/2 schistosity that grades into a steeper-dipping slaty cleavage at the dome margins. Three major deformational and two metamorphic phases can be differentiated. S1/2 schistosity is an axial planar...
Granodiorite of the Coast Plutonic Complex intruded metasedimentary rocks in the Dezadeash Range of the northern Coast Belt in the late Mesozoic. Graphitic staurolite–biotite schist, associated with the Kluane Metamorphic Assemblage, underlies the western Dezadeash Range, whereas cordierite–biotite gneiss, previously correlated with the Late Proter...
Analogue experiments using Polydimethylsiloxane (PDMS) in the Piazolo & ten Grotenhuis shear box apparatus. Wooden ovals are used as proxy for gneiss domes, colored wax pearls are passive markers. Experiments range from simple shear (Wn=1) and various transpressional settings (Wn=0.2 to 0.8).
The Coast Belt of the northern Cordillera in Canada is the locus of the boundary between accreted and ancient North American margin rocks. The largest exposure of metasedimentary rocks in the Coast Belt is the Kluane metamorphic assemblage (KMA), a northwest-striking belt 160 km long of graphitic mica-quartz schist and gneiss with minor interfoliat...
Mica-quartz schist and olivine serpentinites form the Kluane metamorphic assemblage, a 150-km-long belt that is wedged between the Yukon-Tanana Terrane and the Insular Superterrane in the northern Coast Belt. The olivine serpentinites are serpentinized dunites that occur as lens-shaped bodies, interlayered along strike, with the mica-quartz schist....
Poster has two parts. Part one presents shear sense data on the Kluane metamorphic assemblage (KMA, also known as Kluane Schist) accretion underneath Yukon-Tanana-Terrane. The second part discusses the correlation of the KMA with the Maclaren Glacier metamorphic belt on the other side of the Denali fault in Central Alaska, which has been in interpr...
The Kluane metamorphic assemblage (KMA) forms a 160 km NW-SE striking belt of graphitic mica-quartz schist with interlayered ultramafic lenses. It is located east of the Denali fault at the northwestern margin of the Coast Belt of the Western North American Cordillera, between island arc rocks of the Insular Superterrane (INS) to the west and the p...
Thesis (Ph. D.)--University of Alberta, 1997. Includes bibliographical references.
