354 Works

Probabilistic Machine Learning for improved Decision-making with 3-D Geological Models

Florian Wellmann , Miguel de la Varga , Nilgün Güdük , Jan von Harten , Fabian Stamm , Zhouji Liang & s.Mohammad Moulaeifard
Geological models, as 3-D representations of subsurface structures, can be combined with gravity inversions to obtain geometric representations of geological objects with similar porperty distributions. These models are built on prior assumptions and imperfect information, and they often result from an integration of geological and geophysical data types with varying quality. These aspects result in uncertainties about the predicted subsurface structures and property distributions, which will affect the subsequent decision process. We discuss approaches to...

Behaviour of metals in the geothermal fluid system of the Upper Rhine Graben: Lithium

Michèle Jungmann , Benjamin Walter , Elisabeth Eiche , Tobias Kluge , Dominik Gudelius & Jochen Kolb
Karlsruhe Institute of Technology, Germany(1);In order to increase the economic potential of geothermal power plants in view of environmental protection and sustainability, there are considerations to extract critical raw materials (CRM), such as lithium, from the geothermal fluids. The Upper Rhine Graben (URG) in southern Germany is of particular interest as it represents a hydrothermal fluid reservoir with large CRM potential. Apart from the sedimentary strata with different reservoir rocks and associated fluids, their Variscan...

Reconstruct sedimentation rate and time from downhole logging data at Lake Chalco, Central México

Mehrdad Sardar Abadi , Christian Zeeden & Thomas Wonik
Leibniz Institute for applied Geophysics, Germany(1);Understanding the evolution of lower latitude climate from the most recent glacial periods to post-glacial warmth in the continental tropical regions has been obstructed by a lack of continuous geological records. Here we present results from a lacustrine record from tropical North America. Specifically, we examine sediments from Lake Chalco, located in the Valley of Mexico, central Mexico (19°30’N, 99°W). The basin represents a hydrological closed system surrounded by the...

Ultramafic-hosted volcanogenic massive sulfide deposits: an overlooked sub-class of VMS deposits forming in complex tectonic environments?

Clifford Patten , Rémi Coltat , Malte Junge , Alexandre Peillod , Marc Ulrich , Gianreto Manatschal & Jochen Kolb
Institute of applied geochemistry, KIT, Germany;Laboratoire de Géologie, CNRS-UMR 8538, Ecole Nationale Supérieure de Paris, France;Mineralogical State Collection Munich, Germany;Department of Geological Sciences, Stockholm University, Sweden;Institut Terre et Environnement de Strasbourg, CNRS-UMR 7063, Université de Strasbourg, France;Volcanogenic massive sulphide (VMS) deposits have been recognized both in fossil and present-day settings (e.g. mid-ocean ridges (MORs), back-arcs, island-arcs, fore-arcs) and are associated with different lithologies leading to variable metal enrichments. More recently, a sub-type of VMS associated...

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...

Underground Hydrogen Storage (UHS) – status quo and perspectives in Germany

Matthias Warnecke & Simone Röhling
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Germany(1);Recently, politics and industry has discussed green hydrogen as one of the carbon-zero energy sources of the future. Besides many other countries, Germany formulates clear goals for the energy transition from fossil to hydrogen energy in its "National Hydrogen Strategy". In order to ensure steady supply of hydrogen and to secure national reserves the underground storage of hydrogen (UHS) is increasingly coming into focus. Germany already has extensive experience...

Raw materials for our everyday life in the context of museum education

Maryam Junge , Melanie Kaliwoda & Wolfgang W. Schmahl
The need of raw materials for our society and our everyday life steadily increased during the last decades. In particular, the technological development demands for a secure supply as well as increasingly more metals. Therefore, a secured supply of raw materials is crucial for the economy worldwide. The supply risks of metals due to limited availability from only few countries became a political debate during the last decade, .i.e. defining the term critical raw materials....

Soil gas monitoring for identifying potential ground movements and earthquakes in the frame of mine flooding - Requirements, methods and developments

Olaf Ukelis , Roman Zorn & Detlev Rettenmaier
European Institute for Energy Research, Germany(1);Soil gas surveys (e.g. 222Rn, CO2, O2 etc.) are very well known in diverse backgrounds such as the detection of geological faults, prediction of earthquakes or monitoring of gas contamination risks at building sites. Risk monitoring using soil gases in the frame of mine flooding is a quite new field of application currently investigated in the frame of the German BMBF funded project FloodRisk. Analogies to some of the classical...

Nephelinites from the Gregory Rift

Michael Marks, Michelle Siegel , Mika Henzler , Thomas Binder , Simon Braunger, Thomas Wenzel , Anatoly Zaitsev , Andrei Arzamastsev & Gregor Markl
Nephelinites are strongly SiO2-undersaturated volcanic rocks that are often associated with phonolites and carbonatites. In the Gregory Rift in East Africa several major nephelinitic-phonolitic volcanoes occur, with some of them being associated with carbonatitic rocks (e.g., Oldoinyo Lengai, Kerimas, Mosonik, Shombole, Meru), while others lack carbonatites (e.g, Sadiman, Essimingor, Burko). We characterize the magmatic evolution of the Burko volcano and compare our results with published data from spatially associated nephelinite-phonolite±carbonatite associations in the Gregory Rift...

Hydrocarbon Migration and its Implications for Hydrocarbon Exploration and Charge Risk Assessment: Case Studies from the Persian Gulf, Iran

Alireza Baniasad & Ralf Littke
Historically, basin and petroleum system modeling has mainly focused on understanding the burial and thermal history of sedimentary rocks as well as related hydrocarbon generation from kerogen (sedimentary organic matter) in source rocks; much less studies treated hydrocarbon migration and accumulation in great detail, although it is of uttermost importance for petroleum exploration and production. New 2D and 3D basin models in different parts of the Persian Gulf indicate the variable complexity of hydrocarbon migration...

Recent headwall deglaciation and retreat from cosmogenic 10Be in medial moraine debris of a Swiss valley glacier

Katharina Wetterauer, Dirk Scherler , Leif S. Anderson & Hella Wittmann
Debris-covered glaciers are fed from steep bedrock hillslopes that tower above the ice, so-called headwalls. Recent observations in high-alpine glacial environments suggest that rock walls are increasingly destabilized due to climate warming. An increase in debris delivery to glacier surfaces will modify glacial mass balances, as surface debris cover impacts on the melt behavior of the ice underneath. Consequently, we expect that the response of debris-covered glaciers to climate change is likely linked to how...

Linking Laser-Ablation ICP-MS analysis and sulfide textures in identifying gold remobilization and enrichment processes in modern seafloor massive sulfides, Kolumbo arc volcano, Greece

Stephanos P. Kilias , Evangelia Zygouri , Nikolaos Zegkinoglou , Manuel Keith , Thomas Zack , Daniel J. Smith , Paraskevi Nomikou & Paraskevi Polymenakou
Target settings to secure sustainable access to raw materials include seafloor massive sulphide (SMS) resources. Gold-rich SMS deposits, are often the result of complex interplay of multiple Au enrichment events. Recent studies have shown that high-grade Au ores result from Au remobilization from preexisting mineralization, driven by fluid-induced coupled dissolution-reprecipitation (CDR) reactions; however investigations into this process in modern Au-rich SMS, are lacking. To tackle this issue, Au-rich [AuBULK≤32ppm; Au/(Cu+Zn+Pb)=1.9], polymetallic (Sb, Tl, Hg, Ag,...

Tectonic accretion controls erosional cyclicity in the Himalaya

Dirk Scherler , Sanjay Kumar Mandal & Hella Wittmann
Indian Institute of Science Education and Research Kolkata, Mohanpur, India(3);The evolution of Earth’s climate over geological timescales is linked to surface erosion by weathering of silicate minerals and burial of organic carbon. However, methodological difficulties in reconstructing erosion rates through time and feedbacks among tectonics, climate, and erosion spurred an ongoing debate on mountain erosion sensitivity to tectonic and climate forcing. A key question is whether late Cenozoic climate cooling has increased global erosion rates...

Towards a harmonised inventory for European mineral resources

Kari Aasly , Mark Simoni , Pasi Eilu & Lisbeth Flindt-Jørgensen
With the global increase in raw material demand there is a need for harmonized supporting tools for sustainable resource management in Europe. Europe needs to assess their resource potential, but the European countries do not have a common tool to aggregate information for continent-wide resource inventories. The United Nations Framework Classification for Resources (UNFC) is a system that may be used for this purpose. One of the specific tasks in the MINTELL4EU project under the...

3D Basin modelling of the northern Upper Rhine Graben : insights on geothermal fluid pathways

Gillian Bethune , Adriana Lemgruber-Traby , Claire Bossennec , Kristian Bär , Jeroen van der Vaart , Christine Souque & Renaud Divies
The area of the Upper Rhine Graben (URG) is known for its geothermal potential. However, the recent interest for lithium co-production from geothermal brines raises questions about the quantification and dynamics of fluid flow paths in the geothermal system at the basin scale. This study aims to better understand the impact of the fluid circulation on the temperature field evolution and on the fluid recharge by performing a 3D thermal basin modeling. The Buntsandstein group...

The compilation of the new Alpine gravity maps - from the work of the AlpArray Gravity Research Group

Pavol Zahorec , Juraj Papco , Roman Pasteka , Miroslav Bielik , Sylvain Bonvalot , Carla Braitenberg, Jörg Ebbing , Gerald Gabriel , Andrej Gosar , Adam Grand , Hans-Jürgen Götze & György Hetényi
The international networking initiative AlpArray Gravity Research Group (AAGRG) focused on the compiling homogeneous surface-based gravity datasets across the Alps and adjacent areas, on creating digital data sets for Bouguer and Free Air anomalies. In 2016/17 all ten countries around the Alps have agreed to contribute with point or gridded gravity data and data processing techniques to a recompilation of the Alpine gravity field in an area which is limited by 2° to 23° East...

Peak Ring Magnetism: Rock- and mineral-magnetic properties of the Chicxulub impact crater

Bruno Daniel Leite Mendes , Agnes Kontny , Ksenia Gaus , Bonny Kuipers & Mark Dekkers
Large impact structures on Earth like the Chicxulub in Mexico are characterized by magnetic highs but the magneto-mineralogical origin is still poorly constrained and impact-generated melt versus hydrothermal activity models are discussed. The IODP-ICDP expedition 364 drilled into the peak ring of the Chicxulub impact crater, which is characterized by a well-developed hydrothermal system. This system was active for up to 2 Ma, reaching temperatures of 350-450°C. The main goal of our study is the...

Crustal structure and margin configuration of the La Baja Guajira basin, Colombia: regional 2D seismic reflection interpretation, gravimetric and thermal modelling

Leidy Castro-Vera , Ralf Littke , Stefan Back & Rocío Bernal-Olaya
The La Baja Guajira Basin (LBGB) is the primary gas-producing region of Colombia and represents South America's northernmost prolongation. This study presents an analysis of regional 2D-seismic reflection data of LBGB integrated with borehole and gravity information. The deepest basement in the study area occurs in the northwestern offshore. This depocenter is oriented NW-SE. In the basin, four fault groups occur: 1) NW-SE-striking basement normal faults; 2) strike-slip faults; 3) inverted normal faults, and 4)...

Digging into Eocene hothouse climate variability: Linking X-ray fluorescence (XRF) scanning and palynology of Messel sediment cores

Stefanie Kaboth-Bahr , André Bahr , Olaf Lenz , Volker Wilde , Sonja Wedmann & Jörg Pross
The late early to early middle Eocene (~48 Ma) maar lake sediments of the famous Messel fossil-pit, located near Darmstadt, SW Germany, represent a prime archive for climate dynamics operating during the geologically most recent greenhouse period of the Earth. In this study, we investigate the potential of geochemical data obtained via high-resolution XRF core scanning to decipher hydrologic variability from the Messel sediments. Such data have the potential to yield insight into the paleoenvironmental...

First evidence from Lake Melville, Canada: Subglacial lake sediments underneath the Laurentide Ice Sheet?

Sophie Kowalski , Christian Ohlendorf , Andrea Catalina Gebhardt & Jens Matthiessen
The fjord-type Lake Melville is located in Labrador, Eastern Canada, as part of the Hamilton Inlet System. It is mainly characterised by riverine freshwater influx into its western end and intrusion of saline water from the Labrador Sea through the shallow Rigolet Narrows. Previous studies assumed that the retreating Laurentide Ice Sheet (LIS) caused the deposition of a typical glacial sediment sequence when its margin reached Lake Melville between 10,000 to 8,000 years ago (King,...

Microbial H2 consumption at conditions relevant for H2 underground storage

Anja Dohrmann & Martin Krüger
Underground storage of hydrogen could be an alternative way to store large amounts of energy. However, microbial consumption of H2 is still a major uncertainty factor. Since microbial life is widespread in the crust of the earth an underground storage site needs to be seen as a habitat for microorganisms. Microbial activity at the H2 storage site might affect the stored H2 as well as the integrity of the storage site itself. There is great...

Light at the end of the well: A compact and low-cost DIY water level meter

Nils Michelsen
Goundwater level data are a crucial element of water resources assessments. Corresponding measurements are often carried out with electric water level tapes, which are – despite their simple concept – relatively expensive. Here, I present a low-cost alternative, consisting of an ordinary measuring tape and an off-the-shelf “LED bait” (actually used for fishing). The latter is simply attached to the tape with a binder clip and starts flashing upon water contact. At reasonable depth-to-water conditions...

Utilising magnetic minerals to track and identify hydrocarbon migration pathways and source regions: a case study on the Beatrice Field, Inner Moray Firth, UK North Sea

Joseph Richard Perkins , Adrian Muxworthy & Al Fraser
Recent studies at Imperial College London have demonstrated that variations in magnetic mineralogy can be used to help track and quantify hydrocarbon migration. This work has built on past studies that identified strong magnetic anomalies associated with hydrocarbon accumulations, with several mechanisms suggested for their origin including: the influx of magnetic-mineral forming molecules creating new magnetic minerals; the formation of a reducing environment forcing chemical re-magnetisation of in situ minerals; and iron-forming bacteria biodegrading hydrocarbon...

The Early Bird in STEM Education – The PepperMINT Project

Lisa Michael & Tobias Rudolph
In order to cope with the wide-ranging field of geoscientific and geotechnical research it is essential to invest in the education of the next generation’s scientists and engineers. Many German high-school graduates decide to pursue a STEM (Science, Technology, Engineering, Mathematics) degree. Unfortunately, the dropout rates in STEM education are high and students struggle with basic subjects like science and mathematics where they are lacking knowledge from school [1]. With the project “PepperMINT“, funded by...

Contrasting intensity of aragonite dissolution in glacial vs. interglacial intervals of a sea-level controlled subtropical carbonate succession

Lars Reuning , Hanaa Deik , Benjamin Petrick , Hideko Takayanagi , Yasufumi Iryu , Margot Courtillat & Maria-Angela Bassetti
Aragonite and high-Mg calcite are abundant in modern, neritic temperate water systems but are nearly absent from their fossil counterparts. Dissolution of these metastable mineral phases will often leave no visible trace in the sedimentary record. Furthermore, it has been proposed that dolomitization is driven by reflux of mesohaline, aragonite undersaturated waters and that dolomite crystal growth is tightly coupled to aragonite dissolution in a temperate carbonate slope system. This study aims to clarify the...

Registration Year

  • 2022
    354

Resource Types

  • Text
    354

Affiliations

  • Karlsruhe Institute of Technology
    50
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
    33
  • Federal Institute for Geosciences and Natural Resources
    24
  • Technical University of Darmstadt
    17
  • RWTH Aachen University
    14
  • University of Tübingen
    12
  • University of Bremen
    12
  • Ludwig-Maximilians-Universität München
    9
  • Kiel University
    8
  • University of Bern
    7