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Friedhelm Henjes-Kunst

Friedhelm Henjes-Kunst
retired (from Federal Geological Survey of Germany, Hannover) · Isotope Geoscience

About

129
Publications
31,347
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4,070
Citations
Citations since 2016
11 Research Items
1580 Citations
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250

Publications

Publications (129)
Article
We present new geochemical, isotopic and geochronological data for two Cambrian magmatic sequences exposed in northern Victoria Land (Antarctica) at the eastern margin of the Ross-orogenic Wilson Terrane: (i) the metavolcanic and metaplutonic rocks from the Dessent tectono-metamorphic complex, and (ii) the boninite-derived mafic-ultramafic Niagara...
Article
Late Tonian (ca. 785–760 Ma) granodioritic to granitic orthogneisses of the Schirmacher Oasis region in Dronning Maud Land (DML), East Antarctica, are interpreted as recording an active continental margin setting at the periphery of Kalahari and Rodinia. The rocks probably represent exposures of a significant tectonic province hidden beneath the ic...
Article
Full-text available
The Freiberg mining district in the Erzgebirge hosts three principal types of polymetallic veins. These are (1) the quartz-bearing polymetallic sulfide type, (2) the carbonate-bearing polymetallic sulfide type, and (3) the barite-fluorite-sulfide type. We investigated the genesis of each vein-type using Rb-Sr sphalerite geochronology, Sm-Nd fluorit...
Article
The volcanic field of Harrat ar Rahah-’Uwayrid (NW Saudi Arabia) consists of an older plateau basalt sequence that overlies Cambrian sandstone and younger cinder cones with smaller flows that are concentrated in the central part of this field. Petrographic and whole rock geochemical data indicate that the older plateau basalts are alkali olivine ba...
Article
Full-text available
Rocks of the rare-earth element (REY)-enriched apatite deposit in the eastern part of the Schiel Alkaline Complex (SAC; Southern Marginal Zone, Limpopo Belt) were studied for their whole-rock and mineral chemistry, REY mineral distribution and geochronology. Apart from phoscorite (sensu lato), pyroxenite and various syenitic rock types with quite v...
Article
The Tres Marias Zn-Pb-(Ge) deposit in Chihuahua, northern Mexico, is hosted by mid-Cretaceous carbonate rocks. Sulfide ore occurs in a carbonate solution collapse breccia and has been partially altered to zinc silicates and oxides. We have used Rb-Sr sphalerite geochronology and Pb isotope systematics to constrain the age and genesis of the sulfide...
Article
Full-text available
The poorly studied Alpha-Mendeleev Ridge of the Amerasia Basin of the Arctic Ocean is covered by a large magnetic high and interpreted to be part of the Cretaceous High Arctic Large Igneous Province (HALIP). At the north coast of Ellesmere Island, in the Yelverton Bay area, this characteristic magnetic high overlaps the shelf and the coastal area....
Article
Full-text available
The Paleocene was a time of transition for the Arctic, with magmatic activity of the High Arctic Large Igneous Province giving way to magmatism of the North Atlantic Large Igneous Province in connection to plate tectonic changes in the Arctic and North Atlantic. In this study we investigate the Paleocene magmatic record and sediment pathways of the...
Article
Mississippi Valley–type (MVT) Zn-Pb deposits are widely believed to form in compressional tectonic environments, related to gravity-driven fluid flow. They are commonly spatially related to hydrocarbon reservoirs in orogenic foreland settings, but the genetic and temporal links between hydrothermal sulfide mineralization, basin evolution, and hydro...
Article
This article highlights the field geology, geochronology and geochemistry of an important and previously unstudied region between eastern (Sør Rondane Mountains) and central Dronning Maud Land (DML). The area allows the characterisation and ground-truthing of a large and mostly ice-covered area that is geophysically distinct and which was previousl...
Conference Paper
Full-text available
Onshore geological work combined with an onshore/offshore aeromagnetic survey was carried out during joint expeditions of the German BGR and the Canadian GSC to understand the structural architecture of the North American passive continental margin. The joint helicopter-borne magnetic survey in 2008 covered the coastal area of Ellesmere Island to t...
Conference Paper
Full-text available
Onshore extension of the Alpha Ridge into the Yelverton Bay area? Evidence from aeromagnetic and geochronological data Estrada, S.1, Damaske, D.1, Henjes-Kunst, F.1, Oakey, G.2, Schreckenberger, B.1, Eckelmann, K. 3 & Linnemann, U.3 1Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, 30655 Hannover, Germany (solveig.estra...
Article
Tantalum, an important metal for high-technology applications, is recovered from oxide minerals that are present as minor constituents in rare-metal granites and granitic rare-element pegmatites. Columbite-group minerals (CGM) account for the majority of the current tantalum production; other Ta–Nb oxides (TNO) such as tapiolite,wodginite, ixiolite...
Article
The Vergenoeg fluorite deposit in the Bushveld Complex in South Africa is hosted by a volcanic pipe-like body. The distribution characteristics, composition and formation conditions of high-field-strength element (HFSE)-rich minerals in different lithological units of the deposit were investigated by optical and cathodoluminescence microscopy, scan...
Article
Full-text available
Clastic metasedimentary rocks from the Tepla Crystalline Complex (western Bohemian Massif) were analysed for major and trace elements, Sr and Nd isotopes. The metamorphic grade of these rocks of presumed Neoproterozoic protolith age increases from SE to NW from very low-grade to amphibolite-facies conditions. Geochemistry indicates that the sedimen...
Article
Full-text available
Subduction related mafic/ultramafic complexes marking the suture between the Wilson Terrane and the Bowers Terrane in northern Victoria Land (Antarctica) are well-suited for evaluating the magmatic and structural evolution at the Palaeo-Pacific continental margin of Gondwana. One of these intrusions is the "Tiger Gabbro Complex" (TGC), which is loc...
Data
Subduction related mafic/ultramafic complexes marking the suture between the Wilson Terrane and the Bowers Terrane in northern Victoria Land (Antarctica) are well-suited for evaluating the magmatic and structural evolu- tion at the Palaeo-Pacific continental margin of Gondwana. One of these intru- sions is the "Tiger Gabbro Complex" (TGC), which is...
Article
Full-text available
Mafic dykes are a characteristic geological feature of the Ruker Complex in the southern Prince Charles Mountains. We present new geological, geochemical, and Sm-Nd isotopic data for these rocks, which place constraints on their genesis, mantle sources, and relative timing, as well as providing a substantial basis for a comparison between these int...
Article
The Dapingzhang dacite-hosted volcanogenic massive sulfide deposit is located in a late Paleozoic collisional zone, the Sanjiang fold-and-thrust belt, characterized by a collage of Gondwana-derived terranes at the southern margin of the South China (Yangtze) block. This area has experienced repeated Paleozoic and Mesozoic collisional and extensiona...
Article
The study aims to investigate the role of hydrothermal fluids in the formation of talc and magnesite deposits. These deposits occur in manifold geological and tectonical settings such as stockworks and veins within ultramafite hostrocks and monomineralic lenses within marine platform sediments. Along shear zones talc mineralizations may occur as a...
Article
Full-text available
Cretaceous igneous rocks related to the Canadian part of the High Arctic Large Igneous Province (HALIP) were investigated geochronologically using the U-Pb and Ar-Ar methods. The study focused on the predominantly alkaline bimodal Wootton Intrusive (WIC) and Hansen Point Volcanic complexes (HPVC) at northwest Ellesmere Island. Outcrops of these ign...
Article
Full-text available
Petrographical, whole-rock geochemical, Rb-Sr and Sm-Nd isotope as well as geochronological data (conventional and SHRIMP U-Pb methods, Ar-Ar dating) give insights into the magmatic and geotectonic development of the Voikar Massif, Polar Urals, Russia. A mafi c complex that is bordered by an ultramafic complex to the northwest and by an evolved isl...
Article
Ophiolites exposed across the western Tauride belt in SW Turkey represent tectonically-emplaced fragments of oceanic lithosphere incorporated into continental margin following the closure of the Neotethys Ocean during the Late Cretaceous. The mantle sections of the ophiolites contain peridotites with diverse suites of geochemical signatures indicat...
Article
Coltan (the African trade name for columbite-tantalite, a tantalum ore) is one of several raw materials that finance the civil wars in the eastern provinces of the Democratic Republic of the Congo. To improve the transparency along the tantalum trade chain, a ‘certificate of origin’ for so-called ‘conflict minerals’ has been recommended by the Unit...
Article
The Mesoproterozoic Kibara belt in Central Africa has recently been redefined and subdivided into the Karagwe–Ankole belt (KAB) and the Kibara belt (KIB), separated by Palaeoproterozoic (Rusizian) terranes. The KIB and KAB are characterised by the presence of numerous rare metal mineralised (Nb–Ta–Sn) pegmatites and Sn–W mineralised quartz veins th...
Conference Paper
Full-text available
Carbonatites provide most of the World's rare earth elements (REE) but are characteristically enriched in the light REE with low contents of the more highly sought after mid and heavy REE. The Lofdal carbonatite complex, 35 km NW of Khorixas, Namibia, is an exception in that it contains hundreds of carbonatite dykes, some of which are mid and heavy...
Data
The basement of southern Kirwanveggen (western Dronning Maud Land) is formed by a SSW-dipping section consisting of (from SW to NE): migmatic gneisses; granitoid; low-grade/prograde meta-pelites, meta-psammites and meta-basalts (= "Polaris Formation"); ortho-gneiss; quartzite mylonite; Polaris Formation; quartzite mylonite; meta-turbidites.These un...
Conference Paper
Full-text available
The mainly clastic Eureka Sound Group sediments on southern Ellesmere Island (Stenkul Fiord/Split Lake area) bear only few fossils, which allow the identification of particular stratigraphic stages. Recently, we found altered volcanic ash layers that could provide novel stratigraphic marker horizons in the coal–bearing estuarine and fluvial-deltaic...
Article
Full-text available
The age of the hydrothermal Co-Ni-As-(Au) mineralization in the Bou Azzer-El Graara inlier was determined using different isotopic systems on ore and mineralization-related gangue minerals, namely Re-Os on molybdenite, Sm-Nd on carbonates, and U-Pb on brannerite. Re-Os dating of molybdenite was difficult owing to the intimate intergrowth of molybde...
Article
The Ringgold Knoll pegmatite, a late-stage member of the Granite Harbour Intrusives, crosscuts high-grade Wilson gneisses of the Oates Coast. The pegmatite mineral assemblage consists of K-feldspar, plagioclase, quartz, garnet (almandine-spessartine-pyrope), dark tourmaline (schorl-dravite), muscovite, apatite, monazite, zircon, blue Al-rich tourma...
Article
Full-text available
Paleogene sediments in fault-bounded basins on Judge Daly Promontory, northeast Ellesmere Island, Canadian High Arctic, are rich in volcanogenic material. Volcanic pebbles within the Cape Back basin near Nares Strait were studied for their petrography, geochemistry, Sr and Nd isotopes, and geochronology to identify and characterize their parent roc...
Article
During the Neogene, celestite deposits evolved in the Neo-Tethys basins, in what is today called the Mediterranean Sea and the Arabian Gulf. Two evaporite deposits, in Cyprus and in Qatar have been investigated from the sedimentological and mineralogical point of view with emphasis placed on Sr, S and Ca isotopes of carbonate, gypsum and celestite....
Conference Paper
Full-text available
Illegal mining of gold, diamonds, copper, cobalt and, in the last decade, "coltan" has fuelled ongoing armed conflicts and civil war in a number of African countries. Following the United Nations initiative to fingerprint the origin of conflict materials and to develop a traceability system, our working group is investigating "coltan" (i.e. columbi...
Article
Full-text available
The North Mawson Escarpment, in Antarctica’s Prince Charles Mountains, forms part of a Palaeoproterozoic crustal complex which separates Archaean cratonic material to the south from Early Neoproterozoic and Early Palaeozoic metamorphic belts to the north. It consists of nappe-like masses of grey gneiss and metasupracrustal rocks that were subjected...
Article
Full-text available
Following the United Nations initiative to fingerprint the origin of conflict materials, the German Federal Ministry for Economic Cooperation and Development has decided to fund a pilot study on coltan ores. Since 2006, our working group has been investigating columbite-tantalite (coltan) mineralisation, especially in Africa, also within the wider...
Article
Full-text available
Summary: We present new geochemical and U-Pb zircon data on mafic dykes from the southern Prince Charles Mountains. The dykes crystallised at ca 1700 Ma and 1300-1350 Ma. Apparently the oldest (ca 2400 Ma) are high-Mg orthopyroxene-bearing dykes which are also known from the Enderby Land and the Vestfold Hills. Abundant younger dykes are variously...
Article
The Dam Formation in Qatar is a series consisting of calcareous (calcite, dolomite) and evaporitic sediments (gypsum, celestite) that developed under subtidal through supratidal conditions passing towards younger and older series in an environment of deposition more akin to modern beach deposits. In the present study 87Sr/86Sr ratios, δ44/40Ca and...
Article
We report single zircon U-Pb and whole-rock Sm-Nd ages, along with geochemical data, for various leucocratic gneiss, amphibolite and quartzite samples collected from the Lawrence Hills in the Southern Prince Charles Mountains of Antarctica. Our data reveal the existence of two distinct crustal components that were generated at around 2.5 and 1.1 bi...
Article
In the southern Mawson Escarpment, southern Prince Charles Mountains (Antarctica), lenses and blocks of compositionally highly diverse ultramafic and relatively rare mafic rocks are mostly confined to generally east-west trending high-strain shear zones. These rocks consist of amphibole (actinolite, tremolite, anthophyllite or, rarely hornblende),...
Article
The Dam Formation in Qatar is a series consisting of calcareous (calcite, dolomite) and evaporitic sediments (gypsum, celestite) that developed under subtidal through supratidal conditions passing towards younger and older series in an environment of deposition more akin to modern beach deposits. In the present study Sr-87/Sr-86 ratios, delta Ca-44...
Article
Full-text available
The area around Yelverton Bay on the north coast of Ellesmere Island (Canadian Arctic Archipelago) is characterized by the Proterozoic to lower Paleozoic Pearya Terrane and Cretaceous to Cenozoic outliers. Here, the exotic Pearya Terrane comprises the Proterozoic crystalline basement (Succession 1) as well as metasediments and metavolcanics (Succes...
Conference Paper
Full-text available
The demand for electronic metals (e.g. Ge, Ga, In) needed for the fabrication of high-technology materials is growing continuously. Carbonate-hosted, Tsumeb/Kipushi-type base metal sulphide and associated nonsulphide deposits host significant concentrations of germanium, characterized by a unique geochemical association with As, Cu, Ga, In, Mo, Re,...
Article
An interdisciplinary study of the Upper Carboniferous to Middle Permian Ratburi Group, Peninsular Thailand, is presented. The investigation involved sedimentary petrography, inorganic geochemistry, Sr, C, O isotope analyses, micropalaeontology as well as radio-carbon age dating. Emphasis was placed on the post-depositional evolution of the Ratburi...
Article
The early Palaeozoic Ross Orogen in northern Victoria Land, Antarctica, consists of three major fault-bounded tectonostratigraphic terranes. Their true nature, far-travelled or local part of the accretionary collage, is under discussion. The inboard Wilson terrane (WT) consists mainly of high-grade metamorphic rocks intruded by the calc-alkaline ma...
Article
Full-text available
Cretaceous volcanic rocks from the Axel Heiberg and Ellesmere islands of the Canadian High Arctic were studied for their petrography, geochemistry, Rb-Sr and Sm-Nd isotopes, and geochronology. The Early Cretaceous to early Cenomanian tholeiitic olivine basalts of the Isachsen and Strand Fiord formations are petrographically, geochemically, and in t...
Article
High- to very-high-grade migmatitic basement rocks of the Wilson Hills area in northwestern Oates Land (Antarctica) form part of a low-pressure high-temperature belt located at the western inboard side of the Ross-orogenic Wilson Terrane. Zircon, and in part monazite, from four very-high grade migmatites (migmatitic gneisses to diatexites) and zirc...
Article
The high-grade basement of the northwestern Wilson Terrane at Oates Coast is subdivided into three roughly north-south trending zones on the basis of tectonic thrusting and differences in metamorphic petrology. New results of detailed petrological investigations show that metamorphic rocks of the central zone were formed in course of one single, cl...