16 Works

OneGeochemistry: Enabling a coordinated online global network of multiple distributed geochemical repositories and databases

Kerstin Annette Lehnert , Lesley Wyborn , Dominik Hezel , Alexander Prent , Kirsten Elger , Geertje ter Maat , Marthe Klöcking & Jens Klump
Since the discipline of ‘geochemistry’ was first defined in 1838, geochemical data has been pervasively acquired and used in the Earth, environmental and planetary sciences and become fundamental for understanding past, present, and future processes in natural systems. Initially, geochemical data was published in hard-copy literature, but as analytical systems became computerised, major digital databases emerged (EarthChem, PetDB, OZCHEM and GEOROC) which revolutionised data access. They have proven the power of re-use of geochemical data...

The Werra-Fulda mining district, underground extension of the CEVP-alkaline magmatic province – New insights in the magmatic evolution and its interaction with evaporitic deposits.

Axel Zirkler , Ulrich A. Glasmacher , Florian Krob , Silvio Zeibig , Jochen Olbert & Istvan Dunkl
The Werra-Fulda mining district located in Central Germany hosts a world-class deposit of sulfate bearing potash salts. The Permian (Zechstein, ca. 255 Ma) evaporite sequence was intruded by mafic melts in the Neogene resulting in magmatic dykes as well as sill structures frequently observed in the subsurface mining galleries. Furthermore, volcanic rocks intersect the overlaying strata (mainly Buntsandstein and Muschelkalk) at localized spots forming distinct mountains. In this study, samples from subsurface mafic dykes and...

Mesozoic to Cenozoic exhumation history of the Odenwald and Heidelberg, Germany

Ulrich Anton Glasmacher , Florian Krob , Melanie Raupp , Nicklas Brachmann , Dunkl István , Danny Stockli & Günther Wagner
In Germany, the first apatite fission-track study was performed in the Odenwald (Wagner 1968) with the results of Mesozoic apatite fission-track ages. The presentation will re-examine the Mesozoic-Cenozoic exhumation history of the Odenwald and Heidelberg area with new thermochronological data. The Odenwald as part of the Mid-German Crystalline Zone is characterized by outcrops of the Variscan basement and overlain Mesozoic and Cenozoic strata. Towards the West, the Variscan Basement is bound by the Upper Rhine...

Magnesium and calcium isotope fractionation during microbial dolomite formation

Michael Tatzel , Adina Paytan , Samantha Carter , Daniel A. Frick , Francisca Martinez-Ruiz , Zach A. DiLoreto , Maria Dittrich , Tomaso R. R. Bontognali & Mónica Sanchez-Román
Microbial mediation is considered an important process for the formation of primary dolomite at ambient temperature. Yet, no structural, mineralogical, chemical or isotopic means exist to discern this mode of dolomite formation from secondary dolomite. To explore the utility of metal isotopes in allowing this distinction we characterize magnesium and calcium stable isotope ratios in primary (proto)dolomites from a modern hypersaline environment. Samples from the Khor Al-Adaid sabkhas in Qatar show consistent isotopic differences of...

Large regional structures from puzzle pieces - the hidden Triassic rift on the western flank of the Eichsfeld-Altmark-Swell

Alexander Malz, Jonas Kley & Heinz-Gerd Röhling
The incorporation of regional geologic knowledge is essential to solve multiple geological questions in any defined research area meaning that small-scale observations must fit with general regional interpretations as well as the tectonic and sedimentary setting. Conversely, in areas with sparse subsurface information, a conceptional knowledge of the observed area must be developed by incorporating and combining small-scale indications into a sound regional geologic model. In this contribution, we collect some of these small-scale “puzzle...

Habitability of early Earth: Liquid water under a faint young Sun facilitated by tidal heating due to a closer Moon

René Heller , Jan-Peter Duda , Max Winkler , Joachim Reitner & Laurent Gizon
Carbonatites crystallize from mantle-derived carbonate- and volatile-rich melts that exsolve large amounts of fluids during their ascent through and emplacement into the crust. A global review of available fluid inclusion data for carbonatitic systems from variable emplacement depths identified four types of fluid inclusions: (type-I) vapour-poor H2O-NaCl fluids with <50 wt.% salinity; (type-II) vapour-rich H2O-NaCl-CO2 fluids with <5 wt.% salinity; (type-III) multi-component fluids with high salinity without CO2; and (type-IV) multi-component fluids with high salinity...

Late Cretaceous-Tertiary tectonic inversion of northeastern Asian continental margin: insight from the low temperature thermochronology in NE China

Jianping Zhou , Dunkl Dunkl Istvan , Yongjiang Liu , Weimin Li & Hilmar von Eynatten
University of Göttingen, Geoscience Center, Department of Sedimentology and Environmental Geology,Göttingen, Germany (1); Key Lab of Submarine Geoscience and Prospecting Techniques, MOE, Institute for Advanced Ocean Study, College of Marine Geosciences, Ocean University of China, Qingdao, China (2); Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China (3); College of Earth Sciences, Jilin University, Jianshe Str. 2199, Changchun 130061, Jilin, China (4)

The Cretaceous Songliao basin in Northeast...

Mineral inclusions in detrital garnet – An excellent petrogenetic tool

Jan Schönig
Cold and deep subduction is a characteristic feature of modern-style plate tectonics (MSPT) and a prerequisite for the formation of low-temperature/high-pressure (LT/HP) and ultrahigh-pressure (UHP) rocks. Although having strong implications for processes like the movement of materials between surface and mantle, mantle convection, thermal regimes, or the crustal growth rate, the onset of MSPT is poorly understood and controversially debated. One argument for an early onset are local occurrences of Paleoproterozoic retrogressed rocks suggested to...

Automated heavy mineral analysis of silt-sized sediment by artificial-intelligence guided Raman Spectroscopy

Nils Keno Lünsdorf , Jan Ontje Lünsdorf , Gábor Újvári & Hilmar von Eynatten
Compositional data on heavy minerals is fundamental in sedimentary provenance analysis. Typically, this data is gathered by optical microscopy and more recently, by mineral chemical analysis (MLA, QEMSCAN) or Raman micro-spectroscopy. In silt-sized sediments optical microscopy is unfeasible. We introduce a systematic and highly efficient approach to assess the heavy mineral composition in fine grain-size fractions (10-30 µm and 30-62 µm) by Raman micro-spectroscopy. The approach starts with a web-application that creates and visualizes large...

Si isotope thermometry in silicified carbonate

Michael Tatzel , Marcus Oelze , Moritz Liesegang , Maria Stuff & Michael Wiedenbeck
Cherts, including silicified carbonates, are one of the most detailed and alteration resistant archives of near-surface environments. Yet, the information disclosed in form of stable isotope ratios of Si and O cannot be confidently translated into conditions prevailing at the Earth surface in deep time. Thermometry based on δ18O is compromised by the lack of knowledge about the fluid’s δ18O value and attempts to determine Si sources or temperatures from δ30Si remain unsatisfying. We investigated...

Application of in-situ U-Pb-He double-dating on detrital zircons – an example of Alpine sediments from the Inn river and its tributaries

Falko Malis , István Dunkl & Hilmar von Eynatten
In-situ U-Pb-He double-dating of detrital zircon provides information regarding formation and cooling ages of source rocks. Its advantage over conventional dating methods is the unique ability to obtain a high quantity of precise single zircon data with constraints for both low- and high-temperature chronology. In provenance studies the information collected by double-dating can be used to reconstruct more complex tectonic settings and geologic evolution of individual zircons. Here, it is used to distinguish the components...

Timing and mechanisms of Late Mesozoic to Early Cenozoic exhumation and uplift in Central Europe

Hilmar von Eynatten , Jonas Kley & István Dunkl
Widespread exhumation and uplift affected Central Europe in Late Cretaceous to Paleogene time (e.g. Kley and Voigt, 2008, Geology, 36, 839-842). The area involved includes thrust-related basement uplifts and inverted Mesozoic basins and extends at least from the Rhenish Massif to the Bohemian Massif and from the Black Forest/Vosges to the North German Basin. Exhumation and basin inversion started at approx. 95 Ma based on stratigraphic constraints (Voigt et al. 2021, Solid Earth, https://se.copernicus.org/preprints/se-2020-188), well...

Exhumation and erosion rates in the flat-topped Nock Mountains in the Eastern Alps constrained by low-temperature and cosmogenic 10Be data

Andreas Wölfler , Andrea Hampel , Christoph Glotzbach & István Dunkl
Constraining rates of landscape evolution is a necessary pre-requisite for reconstructing the spatiotemporal evolution of the Earth´s surface. In our study, we present new zircon and apatite fission track and (U-Th)/He ages as well as catchment-wide 10Be-derived erosion rates to determine exhumation and erosion rates in the Nock Mountains, an elevated-low relief landscape in the Eastern Alps. Zircon fission track and zircon (U-Th)/He analyses yielded cooling ages of ~90 and ~80 Ma, respectively, which we...

Late Anisian microbe-metazoan build-ups (“stromatolites”) in the Germanic Basin – aftermath of the Permian – Triassic Crisis

Yu Pei , Jan-Peter Duda , Jan Schönig , Cui Luo & Joachim Reitner
The so-called Permian – Triassic mass extinction was followed by a prolonged period of ecological recovery that lasted until the Middle Triassic. Triassic stromatolites from the Germanic Basin seem to be an important part of the puzzle, but have barely been investigated so far. Here we analyzed late Anisian (upper Middle Muschelkalk) stromatolites from across the Germanic Basin by combining petrographic approaches (optical microscopy, micro X-ray fluorescence, Raman imaging) and geochemical analyses (sedimentary hydrocarbons, stable...

Combined architectural-element and microfacies analyses in carbonate sedimentology: the intra-basin shoal complex of the Lower Muschelkalk (Rüdersdorf Formation, Anisian)

Fabian Käsbohrer & Matthias Franz
The layer-cake strata of the epeiric Anisian-Ladinian Muschelkalk are devoid of large-scale architectural elements, e. g. steep clinoforms of a progradional platform slope. This resulted in a simplified approach in facies analysis, in which results of classical microfacies analysis (microscale) are used directly to conclude on depositional models (macroscale). In coastal settings, depositional cycles (mesoscale) are often defined in an intermediate step to visualize progradational or retrogradational patterns of shorelines or shoreline-detached shoals. Apart from...

Does regional geology help to assess earthquake hazard in continental interiors?

Tim Hahn, Jonas Kley, Diethelm Kaiser & Thomas Spies
Earthquake hazard assessment is crucial for different planning tasks, including the search for a German nuclear waste repository. Germany is located in an intraplate setting with a low level of seismicity and the seismically active faults are incompletely known. To solve this problem, seismotectonic regions (SR) of assumed uniform seismicity can be defined and used as a basis to define seismic area sources to be used in seismic hazard analyses. We have elaborated a new...

Registration Year

  • 2022
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  • 2021
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Affiliations

  • University of Göttingen
    15
  • University of Tübingen
    3
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
    3
  • Heidelberg University
    2
  • Göttingen Academy of Sciences and Humanities
    2
  • VU Amsterdam
    1
  • The University of Texas at Austin
    1
  • Columbia University
    1
  • Jilin University
    1
  • University of Münster
    1