24 Works

Characterization of pore space in sandstone using the anisotropy of magnetic susceptibility

Julius Schenk , Agnes Kontny , Benjamin Busch , Ilner Khasanov & Hagen Steger
The pore space in siliciclastic rocks is one of the most important petrophysical properties in reservoir rock characterization. Of particular interest is the 3D distribution of pore space and permeability for the purpose of reservoir model development. We used a magnetic technique to determine the preferred orientation of the pore space. The approach is based on the injection of a magnetic ferrofluid, which is a stable colloidal suspension of approx. 10 nm-sized magnetite particles, into...

Performance of manganese oxide sorbents for direct lithium extraction from geothermal brines

Klemens Slunitschek , Jochen Kolb & Elisabeth Eiche
Lithium is one of the critical elements for the realization of electric mobility and energy transition. With a contribution to global Li-production and recycling of less than 1% (2017), Europe depends almost entirely on Li-import. To reduce the dependency, new and unconventional Li resources are explored in the EU. One resource are highly saline brines from geothermal reservoirs of the Upper Rhine Graben (URG), characterized by Li concentrations of up to 200 mg/L. Due to...

On-site hydraulic and mechanical characterization of a claystone around a non-lined test tunnel in Mont Terri, Switzerland

Sina Hale , Xavier Ries , David Jaeggi & Philipp Blum
The rock mass around man-made underground structures inevitably experiences major changes in hydraulic and mechanical properties, commonly referred to as excavation damage. In host rock formations for underground nuclear waste storage, such an excavation damaged zone (EDZ) is potentially critical and therefore requires reliable field data sets for safety assessment and the estimation of the long-term behavior. In this study, different on-site measurements were carried out in the EZ-B niche of the Mont Terri Rock...

Reservoir characterization of the coal-bearing Upper Carboniferous clastic succession, Ruhr area, Germany

Jonas Greve , Benjamin Busch , Dennis Quandt & Christoph Hilgers
Structural Geology & Tectonics, Karlsruhe Institute of Technology(2);Due to the closure of coal mining in the northwestern German coalfields, active mine water drainage becomes technically redundant. As a result, the rising mine water table affects the subsurface stress conditions and may induce heterogeneous ground movements of fault blocks. Petrophysical properties of the Upper Carboniferous (Westphalian A and B) rocks are crucial to understand subsurface behavior during mine water rise. As a part of the interdisciplinary...

Regional deformation imprints from anisotropy of magnetic susceptibility data – an example from the Raichur Schist Belt (Dharwar Craton, India)

Santu Biswas, Manish A Mamtani , Agnes Kontny & Christoph Hilgers
The Raichur Schist Belt (RSB) is a NW-SE trending late-Archaean greenstone belt that forms part of the supracrustal units lying over an older gneissic basement. Granites (ca 2.5 Ga) occur in the vicinity of the RSB. The metavolcanics and granites are both massive and lack a field foliation and/or lineation. To work out the time-relationship between emplacement, fabric development and regional deformation of the granite vis-à-vis metavolcanic rocks and regional deformation, we performed Anisotropy of...

Checklist to Support the Helmholtz Centers in Implementing Policies on Sustainable Research Software

Reinhard Messerschmidt, Heinz Pampel, Felix Bach, Wolfgang zu Castell, Michael Denker, Ants Finke, Bernadette Fritzsch, Martin Hammitzsch, Uwe Konrad, Yvonne Leifels, Christoph Möhl, Marco Nolden, Markus Scheinert, Tobias Schlauch, Thomas Schnicke & Dirk Steglich
As the digitalization of research and teaching progresses, the number of software solutions developed at scientific institutions and used for the purpose of knowledge production is increasing. The accessibility and reuse of scientific results called for under the heading “open science” can be ensured in many fields only if, in addition to research data, program code is also made openly accessible. The present guide is addressed to decision-makers at the Helmholtz Centers who deal with...

Wall rock contamination and mineralogical modifications in carbonatite dykes of the Palabora Complex, South Africa

R. Johannes Giebel , Benjamin F. Walter , Michael A.W. Marks & Gregor Markl
Contamination of carbonatite melts is often neglected due to a fast magma ascent and low liquidus temperatures. However, increased silicate mineral formation observed in numerous carbonatite occurrences world-wide requires an external Si introduction. Our study demonstrates that carbonatite dykes penetrating different lithologies of Palabora (South Africa) shows different modes of mineralogical modification. In particular Al and Si-rich lithologies show the most significant effects. Besides silicate mineral formation Si introduction may cause directly and indirectly variations...

Diverse Cultures, Universal Capacity: An Interview with Markus Gabriel

Yue Li & Markus Gabriel
The documentary Philosophy in the Age of Desire records a short encounter between Markus Gabriel and Hiroshi Ishiguro’s Geminoid in 2018. Their exchange on the role of technology in human life, on the conception of human being, and other topics revealed noticeable differences between the German philosopher and the Japanese engineer, but can these be interpreted as “cultural” differences? Four years later two separate interviews follow up on their conversation, This interview explores their differences...

Reasons for extreme Th/U zoning of zircon in magmatic rocks: examples from the Bushveld Complex

Armin Zeh , Dominik Gudelius & Allan H Wilson
Zircons of magmatic rocks can show enormous variations in Th/U ratios (0.2 to 100) and extreme Th/U zoning. We present data from felsic and mafic rocks of the Bushveld Complex in South Africa. Zircon grains in mafic cumulate rocks reveal Th/U ratios up to 70, those in felsic rocks barely exceed 1.0. In mafic rocks zircon mostly occur together with Rt-Bt-Kfs-Qtz in intercumulus domains, and crystallized during final magma cooling between 900 and 700°C, after...

FloodRisk: Earthquakes, uplift, and long-term liabilities – risk minimisation during mine flooding

Dennis Quandt , Michael Alber , Felix Allgaier , Benjamin Busch , Even Markus , Kasper Fischer , Wolfgang Friederich , Jonas Greve , Mathias Knaak , Birgit Müller , Thomas Niederhuber , Detlev Rettenmaier , Martina Rische , Thomas Röckel , Frank Schilling , Daniel Schröder , Olaf Ukelis , Malte Westerhaus , Roman Zorn & Benjamin Busch
Due to the cessation of coal mining in Germany, mine water management in the former coal districts is subject to change and of environmental and economic significance. Since there is no technical need to drain the abandoned coal mines, mine water levels rise. As a result, subsurface rock pore pressures rise changing the subsurface effective stress regime. This may induce local ground movements and activate mining-related and natural fault zones. In order to develop a...

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...

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...

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,...

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)...

Helmholtz Open Science Briefing: Zweites Helmholtz Open Science Forum \"Helmholtz in der Nationalen Forschungsdateninfrastruktur (NFDI)\": Report

Nina Leonie Weisweiler, Roland Bertelmann, Constanze Curdt, Frank Oliver Glöckner, Uwe Jandt, Achim Streit, York Sure-Vetter & Nicolas Villacorta
Zur Förderung des Dialogs zur NFDI in der Helmholtz-Gemeinschaft veranstaltete das Helmholtz Open Science Office am 8. Dezember 2021 ein zweites virtuelles Helmholtz Open Science Forum unter dem Motto „Helmholtz in der Nationalen Forschungsdateninfrastruktur (NFDI)“. Alle Mitarbeitenden der Helmholtz-Gemeinschaft waren eingeladen, sich an dem zentrenübergreifenden Austausch zu beteiligen. Aufbauend auf das erste Forum im Mai 2021 lag der Schwerpunkt der Veranstaltung auf der Identifikation und Diskussion von Helmholtzspezifischen Themen und Aktivitäten bei der Realisierung der...

Performance of manganese oxide sorbents for direct lithium extraction from geothermal brines

Klemens Slunitschek , Jochen Kolb & Elisabeth Eiche
Lithium is one of the critical elements for the realization of electric mobility and energy transition. With a contribution to global Li-production and recycling of less than 1% (2017), Europe depends almost entirely on Li-import. To reduce the dependency, new and unconventional Li resources are explored in the EU. One resource are highly saline brines from geothermal reservoirs of the Upper Rhine Graben (URG), characterized by Li concentrations of up to 200 mg/L. Due to...

Hydrothermal Synthesis of Low Layer Charge Trioctahedral Smectite

Liu Yi-Yu , Nils Schewe , Peter Thissen & Katja Emmerich
Smectites are widely used in (geo-) technical applications and are important components of soils. A definition gap exists between the uncharged non-swellable pyrophyllite and talc (ξ = 0) and the low charged swellable clay minerals (smectites) with 0.2 ≤ ξ ≤ 0.6. Furthermore, no reliable measurement method exists for ξ < 0.2. A recent theoretical study on the hydration of smectites (Emmerich et al. 2018) based on the density functional theory (DFT) indicates the existence...

Multi-paprameter monitoring at alpine karst springs to identify suitable early-warning indicators for bacterial contamination

Simon Frank , Nadine Goeppert & Nico Goldscheider
In alpine regions, karst springs are important sources of drinking water but highly vulnerable to temporary contamination, particularly in response to rainfall events. This variability of water quality requires rapid determination methods of contamination parameters. In this study, we present a multi-parameter approach to determine the dynamics of fecal bacteria, organic carbon and particles at alpine karst springs. Conventional cultivation-based analysis of fecal bacteria such as E. coli is time-consuming. The measurement of the enzymatic...

Metal sources in the actively forming seafloor massive sulfide deposit of the Kolumbo volcano: Insight from the basement rocks

S. Hector , C. G. C. Patten, S. P. Kilias , D. Papanikolaou & C. G. C. Kolb
The shallow submarine Kolumbo volcano , located in the 5 Ma-to-present Aegean volcanic arc in Greece, hosts an active hydrothermal system currently forming polymetallic seafloor massive sulfide (SMS) mineralization on the seafloor, with high As, Ag, Au, Hg, Sb and Tl contents. It is one of the few known SMS deposits associated with continental margin volcanism. The hydrothermal system of the Kolumbo volcano represents an active hybrid analogue style of epithermal and VMS mineralization. The...

Effect of cyclic loading at elevated temperatures on the magnetic susceptibility of a magnetite-bearing ore

Katarzyna Dudzisz , Mario Walter, Ralf Krumholtz , Boris Reznik & Agnes Kontny
Rocks are often subjected to dynamic stress that occurs during earthquakes, volcanic activity as well as human-induced activities. The aim of this study is to test if mechanical fatigue in rocks can be monitored by magnetic methods. For this purpose, the effect of cyclic-mechanical loading (150 + 30 MPa) on the magnetic susceptibility and its anisotropy of a magnetite-bearing ore with varying temperatures and environment was investigated. Our study shows that magnetic susceptibility decreases significantly...

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...

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...

Numerical modeling of the stress state around the Enguri power tunnel

Thomas Niederhuber , Birgit Müller , Thomas Röckel, Mirian Kalabegishvili & Frank Schilling
The Enguri Dam in NW Georgia is one of the highest arch dams in the world. The 15 km power tunnel was initially flooded in 1978. During the rehabilitation project from January - April 2021, an 40 m long open construction-joint was observed. The construction-joints are located on both sides in the lower third of the tunnel, but only the construction-joint on the valley side showed an opening character. The research question of the paper...

Cyclic loading of magnetite bearing rocks: modifications of structure, magnetic and elastic properties

Helena Fuchs , Boris Reznik , Agnes Kontny & Frank Schilling
Repeated seismic activity can cause progressive failure of rock masses due to material fatigue [1]. To simulate induced seismic loading, an iron ore with alternating quartz- and magnetite-rich layers from the Sydvaranger mine (Finnmark/Norway) was subjected to laboratory uniaxial compressional cyclic loading at low stresses in the range of elastic deformation (about 6 MPa static ±3 MPa dynamic pressure) and frequencies related to induced seismicity (10 – 100 Hz) [2]. Some of the experiments were...

Registration Year

  • 2022

Resource Types

  • Text


  • Karlsruhe Institute of Technology
  • Helmholtz Association of German Research Centres
  • Alfred Wegener Institute for Polar and Marine Research
  • University of Tübingen
  • Geologischer Dienst Nordrhein-Westfalen (Germany)
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
  • Helmholtz Centre for Environmental Research
  • Gubkin Russian State University of Oil and Gas
  • University of the Free State
  • Georgian Technical University