Armin Zeh

Armin Zeh
Karlsruhe Institute of Technology | KIT · Institut für Angewandte Geowissenschaften - Mineralogie und Petrologie

Dipl. Geol.

About

161
Publications
56,830
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7,483
Citations
Citations since 2016
67 Research Items
4994 Citations
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
Introduction
Additional affiliations
September 2015 - present
Karlsruhe Institute of Technology
Position
  • Professor (Full)
September 2009 - August 2010
Freie Universität Berlin
Position
  • Lecturer

Publications

Publications (161)
Article
The inconsistent stratigraphic framework of the Proterozoic successions in the Aravalli orogen, NW India hinders the detailed reconstruction of its geodynamic evolution during the Archean to Paleoproterozoic. In this study, we present new results of combined U-Pb-Hf isotope data of detrital zircon grains of two conglomerate samples from the souther...
Article
There are ongoing debates about the nature and timing of Kaapvaal-Zimbabwe Craton accretion. A critical role in this discussion plays the Central Zone (CZ) of the Limpopo Belt, which represents a polymetamorphic gneiss terrane limited by the Kaapvaal Craton to the South and the Zimbabwe Craton to the North. Uncertainties mainly result from complex...
Article
We report on the occurrence of pillow lava in the upper part of the banded-ironformation (BIF) sequence of the Quadrilátero Ferrífero, famous for hosting worldclass iron-ore deposits in Minas Gerais, Brazil. A pillow-lava domain is found as an outlier within the BIF sequence, known as the Itabira iron formation or the Itabira Group. The pillow lava...
Article
The Mozaan Group represents the youngest unit of the c. 2.9 Ga Pongola Supergroup located along the south-eastern margin of the Kaapvaal Craton. It comprises a ca. 4800 m thick succession of clastic sedimentary rocks intercalated by minor chemical and volcano-sedimentary rocks deposited in shallow marine to fluvial environments, and is stratigraphi...
Article
Full-text available
The about 2055-Ma-old mafic to ultramafic Uitkomst Complex in the Mpumalanga Province of South Africa hosts the low-grade-large-tonnage Ni-Cu-PGE deposit, Nkomati. The complex is regarded to represent a satellite to the Bushveld Complex and a feeder to an eroded magmatic reservoir in the southeast. Aeromagnetic surveys and previous drilling indicat...
Article
Full-text available
The Carnian Stuttgart-Formation (Schilfsandstein) of the Central European Basin contains relics of Triassic volcanic detritus in form of euhedral zircon grains and authigenic analcime. Multiple LA-ICP-MS spot analyses of single zircon crystals from an outcrop near Heilbronn (SW Germany) yielded weighted average 206 Pb/ 238 U ages between 250 and 23...
Article
The mineral system concept, which combines integrated information from all kinds of geological and geophysical studies, is a very useful approach to predict and locate structures and lithologies potentially associated with gold mineralization at all scales (i.e., upscaling from craton-to district-to camp-to deposit-scale). This is demonstrated in t...
Article
Provenance studies are commonly based on in situ U–Pb dating and Hf isotope analyses of detrital zircon grains, while leaving shape parameters unconsidered, even though these can provide valuable information about the hinterland and detritus transport. This is demonstrated herein by presenting a comprehensive data set derived from approximately 950...
Article
We present the first combined U-Pb ages and Lu-Hf isotope data of zircon grains from the southern Ouaddaï area in Eastern Chad in the Central Africa Orogenic Belt. Zircon xenocrysts from granites and detrital zircons from quartzites of the Ouaddaï document crustal accretion from depleted mantle sources at 3.0 ± 0.5 Ga, rarely up to 3.8 Ga, and for...
Article
The central Aravalli Banded Gneissic Complex, a Proterozoic high-grade polymetamorphic terrane with Archean components in northwest India, is mainly composed of granulites, granitoids, TTG gneisses and metasedimentary rocks. Combined sets of zircon U-Pb-Hf isotopes and whole-rock geochemical data reveal that the gneissic complex is made up of Neoar...
Article
Full-text available
Granites can provide detailed insights into crust formation and reworking during the different stages of orogenic cycles. New field and petrographic observations are integrated with whole-rock geochemical and zircon U-Pb and Hf isotopic data of granitic and subvolcanic felsite intrusions associated with the Atalla Shear Zone (ASZ). Formation of the...
Article
The stabilization of Archaean cratons is accompanied by a transition from juvenile granitic magmatism, to reworking of the pre-existing crust. In this work, we examine the granitoids associated to the ca. 3.1 Ga stabilization of the Kaapvaal Craton of Southern Africa, and investigate the origin and petrogenesis of the granodiorite-monzogranite-syen...
Article
Melt inclusions in zircon represent time capsules, which provide deep insights into igneous rock formation including timing, physicochemical conditions, and the compositional evolution of cogenetic magmas with respect to major, trace, and volatile elements. However, their full potential as petrogenetic indicators, in particular their usability and...
Article
A decimetre-thick, deeply weathered sill intrusive in the Itabira iron formation and exposed at the historical Veloso underground mine in Ouro Preto, Minas Gerais, contains three populations of magmatic zircon grains: (i) xenocrysts with Archaean Pb–Pb and Hf model ages; (ii) xenocrysts of Palaeoproterozoic crystallisation ages of ca. 2200 Ma with...
Article
Full-text available
This paper presents new petrological, geochemical, isotopic (Nd) and geochronological data on magmatic rocks from the poorly known southern Ouaddaï massif, located at the southern edge of the so-called Saharan metacraton. This area is made of greenschist to amphibolite facies metasediments intruded by large pre- to syn-tectonic batholiths of leucog...
Article
The origin of magmas that formed the Bushveld Complex remains highly debated in spite of many decades of intense research. Previous geochemical–petrological studies have shown a strong mantle derivation resulting ultimately in highly economic ore bodies of platinum group elements and chromium. However, geochemistry also points to the contribution o...
Article
Zircon is a potential petrogenetic indicator that can be used to derive physicochemical conditions during magma crystallization. In this study, such conditions are obtained from zircon of both felsic and mafic rocks of the Bushveld Complex (BC), which are characterized by a wide range in bulk-rock Zr contents (4–552 ppm). For that, information from...
Article
The Transvaal Basin in South Africa hosts a 15 km thick pile of sedimentary successions deposited over a period of more than 600 Ma during the Neoarchean to Paleoproterozoic. Presently, little is known about the source of these sediments, as well as about the tectono-magmatic evolution in the hinterland of the Transvaal Basin, preventing detailed g...
Article
Full-text available
The Abu Dabbab rare-metal granite in the Eastern Desert of Egypt is a highly-evolved alkali-feldspar granite with transitional magmatic-hydrothermal features. Extreme geochemical fractionation and the associated significant TaSn resource make the Abu Dabbab intrusion an important feature in the metallogenic evolution of the Arabian-Nubian shield. U...
Article
Full-text available
This contribution explores the petrogenetic relationships between silicate and carbonatitic rocks in the Crevier Alkaline Intrusion (CAI, Québec, Canada). The CAI is located in the Proterozoic Grenville Province and is composed of a suite of undersaturated peralkaline rocks from ijolite to nepheline syenite and carbonatites. Petrogenetic relationsh...
Article
The origin of magmas that formed the Bushveld Complex remains highly debated in spite of many decades of intense research. Previous geochemical–petrological studies have shown a strong mantle derivation resulting ultimately in highly economic ore bodies of platinum group elements and chromium. However, geochemistry also points to the contribution o...
Article
The mineral alabandite, cubic MnS with variable amounts of FeS, occurs in a number of mineral assemblages in manganiferous metasedimentary rocks, some of which are mined as manganese ore. One of them is Morro da Mina, Mina Gerais, Brazil, where alabandite is a minor component of "queluzite", a manganese-silicate-carbonate rock. The Morro da Mina al...
Article
The depositional ages of two Proterozoic supracrustal belts, the older Aravalli Supergroup and the younger Delhi Supergroup, overlying the Aravalli Banded Gneissic Complex in NW India are still unresolved. This study presents new combined detrital zircon U–Pb and Lu–Hf isotope data of two quartzite successions from the Alwar complex of North Delhi...
Conference Paper
Full-text available
The Crevier alkaline intrusion (CAI, QC) is located in the Proterozoic Grenville Province and is composed of a suite of undersaturated alkaline rocks from ijolite to nepheline syenite and carbonatites. We present (i) field relationships; (ii) comagmatic carbonatite, carbonate-free nepheline syenite and carbonate-rich syenite; (iii) textures of inte...
Article
Full-text available
Molybdenum (Mo) and its isotopes have been used to retrieve palaeoenvironmental information on the ocean–atmosphere system through geological time. Their application has so far been restricted to rocks least affected by severe metamorphism and deformation, which may erase or alter palaeoenvironmental signals. Environmental Mo-isotope signatures can...
Article
The Aravalli Banded Gneissic Complex forms a block of Archean gneisses and granitoids in the southern domain of the Aravalli orogen in NW India. Results of U-Pb-Hf isotope analyses on zircon grains combined with whole-rock geochemical data reveal that the gneissic complex is made up of TTGs, which intruded during the Paleoarchean (3310 Ma) and Neoa...
Article
The Allochthonous Belt of the central Grenville Province in Quebec (Canada) hosts LREE-rich pegmatitic granite dykes (PGDs) intrusive into orthogneisses and migmatitic paragneisses. Zircon crystals from a monazite-bearing PGD and two allanite-bearing PGDs of the Lac Okaopéo region were investigated. Concordia U-Pb ages of 1004.2 ± 2.1 Ma, 1001.9 ±...
Chapter
The Pietersburg Block (PB), the northernmost terrane of the Kaapvaal Craton, can be subdivided into four Archaean grey gneiss units: Makhutswi-Murchison South (MMS), Groot Letaba-Duivelskloof (GDL), Goudplaats-Hout River (GHR) and Southern Marginal Zone (SMZ). These domains are limited by greenstone belts (Pietersburg, Murchison, Rhenosterkoppies a...
Article
Full-text available
We present structural, petrological, geochemical and geochronological data compiled in a new geological map on the high-grade metamorphic rocks exposed in the Mbé – Sassa-Mbersi region located along the Tcholliré-Banyo Shear Zone, at the northern edge of the Central Cameroon domain. The region exposes a complex assemblage of metabasic (hornblendite...
Article
Microstructures, trace elements and U–Pb ages of rutile grains are reported from two metasandstone samples of the Moeda Formation, which is the basal unit of the Minas Supergroup in the Quadrilátero Ferrífero, Minas Gerais, Brazil. The Moeda metasandstones, deposited between 2.68 and 2.65 Ga, are intercalated with Witwatersrand-like, pyritiferous a...
Article
Full-text available
Muscovite peraluminous granites (MPGs) form by partial melting of the continental crust and can be related to metalliferous deposits such as tin, tungsten and uranium(U). Metal enrichment in MPGs commonly results from fractional crystallization, but the metal contents of the source play a major role for their fertility. Between ca. 320 and 300 Ma (...
Conference Paper
Full-text available
Muscovite peraluminous leucogranites (MPGs) form by partial melting of the continental crust and can be related to metalliferous deposits such as tin, tungsten and uranium (U). Metal enrichment in MPGs commonly results from fractional crystallization, but the metal contents of the source play a major role for their fertility. In the European Varisc...
Article
The c.3.0–2.9 Ga Pongola Supergroup located on the south-eastern margin of the Kaapvaal Craton preserves some of the most pristine Archean successions but the timing of volcanic and sedimentary processes, and sediment sources remain relatively poorly known. Combined zircon U-Pb ages and Hf isotope data of sandstones from the Nsuze and Mozaan Groups...
Article
V. Ngako and E. Njonfang addressed in their comment an interesting and debated issue about the collision geodynamics of the Pan-African Central African Orogenic Belt (CAOB) in Cameroon. However, the reason for this comment is still not clear to us since it mainly deals with issues far away from the scope of our study, namely, the pre-collisional se...
Article
The Münchberg Massif in northeastern Bavaria, Germany is an allochthonous metamorphic nappe complex within the Saxothuringian Zone of the Variscan orogen. From top to bottom it consists of four major units: Hangend-Serie, Liegend-Serie, Randamphibolit-Serie and Prasinit-Phyllit-Serie, which show an inverted metamorphic gradient of eclogite- to amph...
Article
Molybdenum enrichment in pristine organic-C-rich sedimentary rocks forms the basis for inferring the presence of dissolved oxygen in seawater. Organic matter removes dissolved hexavalent Mo from seawater where anoxic and euxinic conditions are attained. However, it is unknown whether this Mo-based proxy is retained under metamorphic conditions wher...
Article
The South Armorican Shear Zone (SASZ), in the French Armorican Variscan belt, is a lithospheric wrench fault that acted during the Late Carboniferous as a transition zone between two distinct domains: a thickened domain to the south affected by extension and crustal magmatism, and a weakly thickened domain to the north subjected to dextral wrenchin...
Article
Full-text available
In plutonic systems, magma mixing is often modelled by mass balance based on whole-rock geochemistry. However, magma mixing is a chaotic process and chemical equilibration is controlled by non-linear diffusive–advective processes unresolved by the study of bulk samples. Here we present textural observations, LA-(MC-)ICP-MS trace element and Sr–Nd i...
Conference Paper
Full-text available
The central Grenville Province (Quebec) hosts numerous monazite- or allanite-rich pegmatitic granite dykes that display evidence for a post-tectonic timing of emplacement and a rooting in deep units. Investigations of zircon grains, through U-Pb-Hf-O isotopes and trace element analyses from three of these dykes provide evidence that all dykes were...
Article
Stratigraphically well-defined volcanic rocks in Palaeozoic volcano-sedimentary units of the Frankenwald area (Saxothuringian Zone, Variscan Orogen) were sampled for geochemical characterisation and U–Pb zircon dating. The oldest rock suite comprises quartz keratophyre, brecciated keratophyre, quartz keratophyre tuff and basalt, formed in Upper Cam...
Article
Full-text available
The East Massif Central (EMC), France, is part of the internal zone of the Variscan belt where late Carboniferous crustal melting and orogenic collapse have largely obliterated the pre- to early-Variscan geological record. Nevertheless, parts of this history can be reconstructed by using in-situ U-Th-Pb-Lu-Hf isotopic data of texturally well-define...
Article
The late Palaeoproterozoic A-type granites of the northern Aravalli orogen, NW India are moderately to completely metasomatised (albitisation), rendering conventional whole-rock isotope systems, such as Rb-Sr and Sm-Nd meaningless to understand petrogenesis of these rocks. In situ U-Pb-Hf isotope composition of zircon combined with previously publi...
Article
The Bushveld Complex is the largest mafic layered intrusion on Earth, containing immense mineral resources. Despite its importance there remains uncertainty as to its origin and the source of the magmas that formed it. The lower Bushveld series, made up of the Basal Ultramafic Sequence (BUS), the Marginal Zone and Lower Zone, is of particular impor...
Article
We report the results of combined U-Pb and Lu-Hf isotope analyses of detrital and metamorphic zircon grains from a variety of metavolcano-sedimentary rocks of the Dwalile Supracrustal Suite (DSS) from the ca. 3.66-3.20 Ga Ancient Gneiss Complex (AGC) in Swaziland. The results indicate that the DSS is made up by Palaeo- and Mesoarchaean rocks which...
Article
The platiniferous gold–palladium belt of Minas Gerais, Brazil, forms an approximately 240-km-long, roughly north–south-trending domain that includes numerous auriferous lodes and platiniferous alluvium. The belt transects two Precambrian terranes, the Quadrilátero Ferrífero in the southern part, and the southern Serra do Espinhaço in the northern p...
Article
Full-text available
The late stages of the Variscan orogeny are characterized by middle to lower crustal melting and intrusion of voluminous granitoids throughout the belt, which makes it akin to “hot” orogens. These processes resulted in the development of large granite–migmatite complexes, the largest of which being the 305–300-Ma-old Velay dome in the eastern Frenc...
Conference Paper
Full-text available
Dans la chaîne hercynienne européenne, la majorité des minéralisations uranifères (filons ou épisyenites) est représentée par des gisements hydrothermaux spatialement associés à des leucogranites peralumineux d’âge Carbonifère. Ainsi, dans le Massif armoricain, 20000 t d’uranium ont été extraites principalement des trois districts uranifères associ...
Article
The crust of the Paleoproterozoic West African Craton in northern Ghana is dominantly made of Tonalite-Trondhjemite-Granodiorite (TTG) suites, low-K to high-K calc-alkaline granites, with minor LILE-enriched diorites, and chemically related lavas. Results of zircon U-Pb dating indicate that all these different rock types were formed together over a...
Article
Earth's continental crust is dominantly made of buoyant, felsic igneous material (granitoids), that were ultimately extracted from the mantle as a result of Earth's differentiation. Since felsic melts are not in chemical equilibrium with the mantle, they can originate either from melting of older crustal lithologies, or from differentiation of a pr...
Article
The distinction between regional metamorphic and metasomatic mineral assemblages may be occasionally challenging when the two phenomena show a very close spatial and temporal association. The Khetri complex in NW India, provides an excellent example of a geological terrane that has been significantly affected by metamorphism followed by extensive m...
Article
Combined whole-rock, U-Pb zircon and monazite dating, in situ zircon (MC)-SF-ICP-MS Lu-Hf-isotope data are reported for more than 20 Archaean granitoid samples to constrain magmatic events and their sources in the Bundelkhand Craton, northern India. The results are crucial for understanding the extent of reworking vs juvenile crustal growth during...
Article
The Magaliesberg Formation quartzite of the upper Transvaal Supergroup in north-central South Africa represents the biggest Paleoproterozoic arenite deposit on Earth, with a present-day lateral extent of more than 600 km. It therefore has a great potential to provide detailed information about Archean to early Paleoproterozoic crust–mantle evolutio...
Article
Full-text available
The Bakhuis Granulite Belt (BGB) is a metamorphic terrain within the Guiana Shield that experienced ultrahigh-temperature (UHT) metamorphism at 2.07–2.05 Ga. In the southwest of the BGB, the Kabalebo charnockites were emplaced at ca. 1.99 Ga and thus postdate UHT metamorphism by at least 60 Myr. Two generations of gabbroic intrusions have been reco...