349 Works

Biogeographic patterns of benthic foraminifera in contourite drift systems of the Atlantic Ocean

Anna Saupe , Johanna Schmidt , Jassin Petersen , André Bahr & Patrick Grunert
Benthic foraminifera inhabit diverse marine environments, including areas of persistent bottom currents and contourite drift deposition. Certain highly adapted epibenthic foraminifera colonize contourite deposits as opportunistic suspension feeders. A correlation between these assemblages and high bottom current velocities has been highlighted in previous studies from the Iberian Margin (e.g. Schönfeld, 2002), suggesting their applicability as reliable proxy for reconstructing bottom currents. Our ongoing project aims to document biogeographic patterns of benthic foraminifera from extended contourite...

Battery metal exploration targets in the Erzgebirge from stream sediment geochemistry and mineral predictive mapping with self-organizing maps

Andreas Brosig , Andreas Barth, Peggy Hielscher , Claus Legler , Stefan Schaefer, Peter Bock & Andreas Knobloch
A 50-element stream sediment geochemistry survey with a sample density of one sample per km² shows anomalies for a number of high technology metals, including Sn, W and the battery metals Co and Li. Apart from the anomalies associated with known deposits, low-level anomalies of Li and Co are widespread in anchimetamorphic to greenschist facies metasedimentary rocks. Li anomalies are prominent in Phycoden Group phyllites in the Vogtland and parts of the Frauenbach and Thum...

Modelling Switzerland’s Geology using a Multi-Method Approach

Eva Kurmann & Lance Reynolds
The Swiss Geological Survey (SGS) produces a suite of 3D geological models – both structural and parametric - in an established production environment, on a nation-wide basis. Output consists of regional-scale models of the deep subsurface (e.g. geological and temperature model of the Swiss Molasse Basin) as well as local-scale models of the shallow subsurface, with varying degrees of content and complexity. In addition, a new profile-based approach is currently being implemented – primarily using...

Geophysical borehole logging - using existing data for petrophysical and regional characterisation of claystone formations

Gesa Kuhlmann & Klaus Reinhold
BGR-Dienstbereich Berlin, Germany(1);Claystones in the deep subsurface have various barrier-effective properties for solute transport. Changes in the mineralogical composition (incl. fluids), the structure of claystones in the strict sense, as well for claystone formations in a broader sense, and their regionally different geological development cause a great variety of petrophysical, mineralogical and geochemical properties of claystone sequences. Therefore, sound knowledge of the characteristics of claystone formations is required for the different usage options of the...

Forward stratigraphic modelling of marine petroleum source rocks: the case of the Carson Basin

Samer Bou Daher , Erwan Le Guerroué , Paul Jermannaud & Alcide Thebault
Organic matter rich rocks are the main component of any petroleum system. Marine organic matter deposits form a major part of these rocks and are the source of most oil. Vertical and lateral heterogeneities in marine petroleum source rocks are widely observed and owed to the dynamics of deposition and preservation of marine organic matter. Such source rock heterogeneities add major challenges to hydrocarbon exploration and estimation of resources, therefore, quantification of source rock potential...

Nachbergbau: Chancen und Herausforderungen

Dennis Quandt , Tobias Rudolph & Christoph Hilgers
Bergbau im 21. Jahrhundert bedeutet auch Alt- und Nachbergbau, immer geknüpft an die Bewältigung post-montaner Herausforderungen und die Langzeit- und Zukunftsaufgaben. Hiermit einhergehend sind Fragestellungen zu den damit verbundenen Kosten und der Möglichkeit der Weiterentwicklung im Bereich der Standortintegrität und -überwachung. Zusätzlich ist die gesellschaftliche Akzeptanz (engl. „social license to operate“) von Bergbauprojekten immer ein Thema. Die Forderung der Öffentlichkeit nach mehr Informationen bei der Erkundung, der Erschließung, der Produktion und der Stilllegung eines Bergbaustandortes...

Hydro-Mechanical Simulation in Geothermal Reservoirs: Physics and Surrogate Modeling

Ryan Santoso , Denise Degen , Mauro Cacace & Florian Wellmann
Hydro-mechanical (HM) simulations are essential aspects of geothermal reservoir studies to assess the heat production and the associated-environmental impacts, such as seismicity. HM simulations are numerically expensive (especially for large-scale simulations) since they require a relatively fine mesh to capture the complex interplay between the fluid-flow and geomechanical processes. This aspect makes it difficult to perform detailed studies on uncertainties in HM simulations. In this work, we present a comprehensive review and numerical demonstrations about...

Groundwater exploration and production in arid Jordan

Falk Lindenmaier , Gerhard Kapinos , Mark Gropius , Klaus Holzner , Florian Brückner , Daniel van Rooijen , Rebecca Bahls & Mathias Toll
The water providers of Jordan are constantly seeking to find new water resources to supply the public. Water table depths of up to 250 m, dry aquifers and saline waters make it increasingly difficult to successfully strike exploitable groundwater. We provided geoelectrical measurements for the exploration of a new well field area and set up a preliminary a-priori model for the interpretation of the geoelectrical results. Borehole geophysical logs, data on salinity content and subsurface...

Numerical modelling of seasonal underground hydrogen storage in a saline aquifer

Alvaro Sainz-Garcia , Fidel Grandia , Elena Abarca & Jordi Bruno
Current renewable energies are unsteady resulting in temporary mismatches between demand and supply. The conversion of surplus energy to hydrogen and its storage in geological formations is one option to balance this energy gap. This study evaluates the feasibility of seasonal storage of hydrogen produced from excess wind power electricity in a saline aquifer in Castilla-León region (northern Spain). A 3D multiphase numerical model is performed to test different extraction well configurations during three annual...

Rock-hosted life through time - Integrating biosignatures of ancient and modern hydrothermal systems

Florence Schubotz
Recent advances in analytical tools including more sensitive detection techniques have led to the discovery of microbial biosignatures in ultra-low biomass samples such as the oceanic lithosphere. Here, energy fluxes are low and microbial life has adapted to the slow cycling of sparsely available food and nutrient sources along cracks and fissures and the access to Earths chemical energy through water-rock interactions. Nevertheless, our understanding of the habitability of Earths lithosphere and potential connections to...

The family of battery metals found in European seabed mineral deposits: The MINDeSEA perspective

Javier Gonzalez , Teresa Medialdea , Henrik Schiellerup , Irene Zananiri , Pedro Ferreira , Luis Somoza , Xavier Monteys , Trevor Alcorn , Egidio Marino , Ana Lobato , Thomas Kuhn , Johan Nyberg , Vitor Magalhaes , Rosario Lunar , Boris Malyuk , James Hein & Georgy Cherkashov
Covering 15,000,000 km2, the pan-European seas represent a promising new frontier for the exploration of mineral resources. The GeoERA-MINDeSEA consortium, a cooperative network of 12 Geological Surveys and Marine Institutes, is facing this exploration challenge. 688 seabed mineral occurrences are described in the MINDeSEA database, GIS cartographies and reports, containing valuable information on geology, metallogeny, critical raw materials prospectivity and mineral potential. Five types of mineral deposits are investigated, including seafloor massive sulphides, ferromanganese crusts,...

Ternary porosity systems: New perspectives for Buntsandstein geothermal reservoirs in the Upper Rhine Graben, SW Germany.

Ernst Kiefer , Birgit Müller & Frank Schilling
The clastic Lower Triassic Buntsandstein Formation in the Upper Rhine Graben of SW Germany and NE France has been identified as an attractive geothermal reservoir due to its fracture density and exceptionally high matrix porosity at depth levels of economic geothermal energy extraction. New petrophysical data from deep exploration wells reveal the existence of ternary porosity systems evolved during a multi-phase subsidence history and diagenesis especially at intra-graben structural highs. Primary elements of these porosity...

Reconstruct the evolution of Milankovtich cycle in Paleozoic and Proterozoic and Earth-Moon separation history

Maoyang Zhou , Huaichun Wu & Qiang Fang
At present, it is difficult to obtain numerical astronomy solutions prior to 50 Ma , which should be two reasons for this. First, the solar system's chaotic behavior, namely, small initial disturbances will greatly affect the results of the numerical model of the earth orbit. Second, we do not fully understand the evolution history of the Earth-Moon separation, that is the distance versus time series. Recently, a new method called "TimeOptMCMC" has been successfully applied...

Release of beryllium (Be) and tungsten (W) from historical mine tailings and the environmental impact on epilithic water diatoms in downstream surface water

Lina Hällström
There is a potential risk that geochemical cycles of critical metals (e.g Be and W) will be affected in the pristine environment, when mining of these metals increases to meet the demand in green technology. To understand their geochemical behavior and environmental impact are of high importance to ensure a sustainable development of mine waste and water management. Beryllium and W are identified as elements of potential concern that can have adverse impact on humans...

Evolution and Modeling of the Carbonate-Clastic Permian system in the Jeffara Basin, Central Tunisia

Christos Kougioulis, Pierre-Olivier Bruna , Allard Willem Martinius , Ahmed Nasri , Ghofrane Laouini & Giovanni Bertotti
Permian deposits are found in outcrops and in the subsurface of Central Tunisia. Their sedimentary and stratigraphic characteristics and origin are not fully understood and represents the main focus of this work. Base level changes, location of the palaeo-coastline and stratigraphic architecture and sandstone connectivity of formations are insufficiently known. Answering these questions will impact future hydrocarbon exploration and improve the geological understanding of Tunisia. Seismic lines and well data of the Jeffara Basin have...

Fracture network characterization and DFN modelling of the Upper Carboniferous, Ruhr Area, Germany

Felix Allgaier, Benjamin Busch , Dennis Quandt , Thomas Niederhuber , Birgit Müller & Christoph Hilgers
Since coal mining in the Ruhr Area has been ceased, mine water drainage is gradually reduced leading to the rise of formation water and groundwater levels. Rising mine water levels increase the pore pressure and induce stress changes in the subsurface, which may reactivate natural and/or mining-related faults and fractures. As part of the interdisciplinary FloodRisk project, which aims to enhance the understanding of the geomechanical coupling of increased pore pressure and heterogeneous ground movements,...

Biomineralization processes in low-temperature, shallow-water hydrothermal vent at Tagoro submarine volcano, El Hierro Island (Central East Atlantic)

Blanca Rincón-Tomás , Francisco Javier González , Luis Somoza , James R. Hein , Teresa Medialdea , Esther Santofimia, Egidio Marino & Pedro Madureira
A novel hydrothermal system was discovered at the summit of the underwater Tagoro volcano at 89–120 m depth after the 2011–2012 eruption, characterized by the low-temperature venting of Fe-rich fluids that produced a seafloor draped by extensive Fe-flocculate deposits. The basanite-hornitos are capped by mm- to cm-thick hydrothermally derived Fe-oxyhydroxide sediment and contain micro-cracks and degasification vesicles filled by sulfides (mostly pyrite) and covered by sulfur-oxidizing bacterial mats. Electron microprobe studies on Fe-oxyhydroxide crusts show...

Dynamic as always – Sedimentary evolution of a coral reef island from the Spermonde Archipelago, Indonesia

Yannis Kappelmann , Hildegard Westphal , Dominik Kneer , André Wizemann & Thomas Mann
Leibniz Centre for Tropical Marine Research (ZMT), Fahrenheitstraße 6, Bremen, Germany(1);University of Bremen, Bibliothekstraße 1, Bremen, Germany(2);Bioplan GmbH, Strandstraße 32a, 18211 Ostseebad Nienhagen, Germany(3);Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, Hannover, Germany(4);The effects of changing climate and environmental conditions on coral reef islands have received a lot of attention, and the findings are discussed broadly. The low elevation of such islands above mean sea level and the largely unconsolidated sediment is exposing them to...

Permeability available for VMS source fluids in altered and fractured lavas in the oceanic crust, Semail ophiolite, Oman

Alannah C. Brett & Larryn W. Diamond
The distribution of permeability in the upper oceanic crust controls hydrothermal circulation and the water–rock interactions that feed seafloor mineralization. A prevailing view is that lavas behave as fractured aquifers whose permeability is dominated by major extensional faults flanked by damage zones. Comparatively little is known about the permeability of the km-wide blocks of crust that lie between major faults, yet such blocks constitute huge sources of leachable metals. Our field mapping of hydrothermal veins...

The Museum Mineralogia München (SNSB), a geoscientific place of education

Melanie Kaliwoda, Malte Junge , Malte Hentschel & Wolfgang W. Schmahl
The Museum Mineralogia München represents the museum window of the Mineralogical State Collection Munich (SNSB). It shows constantly reprocessed geoscientific topics through diverse special and permanent exhibitions. In addition, there are numerous exhibitions that are particularly well suited to natural science school content. Topics such as volcanism, symmetry, metamorphosis or the chemistry of pigments are worth mentioning here. It is important to us that the projects can be attended by children and young people and...

Antarctic sea ice reconstructions: pros and cons of highly branched isoprenoids as sea ice proxies

Nele Lamping , Wee Wei Khoo , Juliane Müller , Oliver Esper , Thomas Frederichs & Christian Haas
The reconstruction of past Antarctic sea ice coverage through the application of diatom assemblages is often hampered in near coastal environments due to silica dissolution effects. The more recently established approach of using highly branched isoprenoid biomarkers to identify past sea ice conditions seems a valid method to overcome this limitation and that may also provide insight into ice-shelf dynamics. Here, we evaluate the so-called PIPSO25 index applied to modern surface sediments from the Amundsen...

Petrology and Geochronology of foidites and melilitites in SW Germany and E France

Thomas Binder , Benjamin F. Walter & Michael A. W. Marks
Foidites and melilitites are strongly SiO2-undersaturated rocks that form by extremely low degrees of partial melting of the metasomatically overprinted lithospheric mantle. In Central Europe, they occur in volcanic fields, dike swarms or as isolated stocks and diatremes. Our detailed study on foidites from SW Germany indicates two distinct age groups with marked differences in mineralogy and mineral chemistry: Based on in-situ U Pb age data (apatite, perovskite, zircon) a Miocene cohort (~ 9–19 Ma)...

The Eocene-Oligocene Transition in intra-continental basins: A perspective from the Upper Rhine Graben

Emile Simon , Hendrik Vogel & Mathieu Schuster
The Eocene-Oligocene Transition (EOT) marks a turning point from the Eocene greenhouse paleoclimate to near-modern icehouse conditions. This ~790 kyr long interval is associated with major shifts in geochemical and sedimentological proxies, biological extinctions, and evolutionary turnovers, in both the marine and continental realms. These various archives provide strong evidence for a rapid global cooling, an oceanic reorganization, and the onset of a continental-scale icesheet over Antarctica. The two main causes invoked for this climatic...

Granulometric and lithologic control on heavy mineral distribution in Alpine fluvial sediment

Ariane Djahansouzi, Laura Stutenbecker, Daniela Krieg & Christoph Glotzbach
Heavy mineral studies are dependent on many variables that should be considered in order to avoid erroneous provenance interpretations. Firstly, sediment transported and deposited by larger rivers is the result of the erosion of several lithological units present in the catchment with potentially differing mineral fertilities. Secondly, possible bias arises from the narrow sand-size window that is typically considered for single-grain analysis in sedimentary provenance studies. Quantifying and understanding the resulting bias is crucial for...

The Drosendorf Unit in the Austrian part of the Bohemian Massif: Does it host the oldest rock fragments of Variscan Europe?

Martin Lindner , Etienne Skrzypek , Christoph Hauzenberger , Dominik Hauser , Sabina Steiner & Fritz Finger
Remnants of pre-Cadomian rocks are scarce in the Variscides including the Bohemian Massif. In the latter, numerous Variscan metamorphosed Mesoproterozoic and Early Neoproterozoic sediments and granitoids are contained in the Drosendorf Unit (DU) in Lower Austria. Here, we present U-Pb zircon ages for two orthogneisses from this unit showing even older magmatic formation ages of 2.10 Ga and 2.05 Ga. These granitoid gneisses with volcanic-arc and within-plate characteristics belong to the oldest rocks known from...

Registration Year

  • 2022

Resource Types

  • Text


  • Karlsruhe Institute of Technology
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
  • Federal Institute for Geosciences and Natural Resources
  • Technical University of Darmstadt
  • RWTH Aachen University
  • University of Bremen
  • University of Tübingen
  • Ludwig-Maximilians-Universität München
  • University of Bern
  • Leibniz University Hannover