62 Works

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...

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...

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...

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...

Impacts of probabilistic geological realizations in a geothermal reservoir using numerical and statistical investigations

Ali Dashti , Maziar Gholami Korzani , Christophe Geuzaine & Thomas Kohl
Achieving a (?) reliable geological model is the foremost step in all underground resource assessments. However, regarding the sparsity of data and lack of knowledge, a spectrum of solutions makes more sense compared to a single deterministic model. It this study, a probabilistic geological modeler (Gempy) is used to understand the effect of existing uncertainty in the data representing subsurface layers and faults. A synthetic single fault model in which both the layers and fault...

Numerical Modeling of the 2007-2009 Lava Dome Growth in the Crater of Volcán de Colima, México

Natalya Zeinalova & Alik Ismail-Zadeh
Volcán de Colima is active andesitic stratovolcano in México located at the height of about 3860 m above sea level. It belongs to the Colima Volcanic complex within the Trans-Mexican Volcanic Belt. This volcano is characterized by intermittency of explosive and effusive episodes of volcanic eruptions. For 2007-2009 slowly extruded magma led to a lava dome formation and growth in the volcanic crater. In this work, we present two-dimensional numerical models of the lava dome...

Differences in decompression of the high-pressure Cycladic Blueschist Unit (Naxos Island, Greece): what can inclusions tell us?

Alexandre Peillod , Jarosław Majka , Uwe Ring , Kirsten Drüppel , Clifford Patten , Andreas Karlsson , Adam Włodek & Elof Tehler
Determining the tectonic evolution and thermal structure of a tectonic unit that experiences a subduction-related pressure temperature (P-T) loop is challenging. Within a single unit, P-T conditions can vary from top to bottom which can be only revealed by detailed petrological work. We present micropetrological data of the middle section of the Cycladic Blueschist Unit (CBU) in Naxos, Greece, which indicate a different P-T loop than the top of the section. In the middle section,...

SpannEnD - The crustal stress state of Germany

Steffen Ahlers , Andreas Henk , Tobias Hergert , Karsten Reiter , Birgit Müller , Luisa Röckel , Oliver Heidbach , Sophia Morawietz , Magdalena Scheck-Wenderoth & Denis Anikiev
Information about the recent stress state of the upper crust is important for understanding tectonic processes and for the use of the underground in general. A currently important topic, the search for a radioactive waste deposit, illustrates this relevance, as the crustal stress state is decisive for the short and long-term safety of a possible repository. For example, the integrity of the host rock due to the activation or reactivation of faults and associated fluid...

A global review of carbonatite-hosted fluid inclusions and the role of fluid release on carbonatite magma ascent

Benjamin Florian Walter , Johannes Giebel , Matthew Steele-MacInnis , Michael Marks , Jochen Kolb & Gregor Markl
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...

Self-potential and electromagnetic radiation monitoring of hydraulic fracturing experiments at the Äspö hard rock laboratory (Sweden)

Nadine Haaf & Eva Schill
At the Äspö hard rock underground laboratory in Sweden, six in situ hydraulic fracturing experiments took place at 410 m depth. A multistage hydraulic fracturing approach is tested with a low environmental impact, e.g., induced seismicity. The idea is to mitigate induced seismicity and preserve the permeability enhancement process under safe conditions. The fractures are initiated by two different injection systems (conventional and progressive). An extensive sensor array is installed at level 410 m, including...

Single borehole dilution tests using a permeable injection bag and a novel point-injection probe for the hydraulic characterization of karst aquifers

Nikolai Fahrmeier , Nadine Goeppert & Nico Goldscheider
Single borehole dilution tests are a method for characterizing groundwater monitoring wells or boreholes and can either be conducted as uniform injection throughout the entire saturated length or as point injection at one specific depth. By injecting a tracer into a borehole and measuring concentration profiles, flow horizons and possible vertical flow can be identified and quantified. Compared to conventional methods, such as flowmeters, SBDTs are cheaper and require less equipment, but allow important conclusions...

Comparison of high-resolution SIMS profiles with maximum resolution IRMS stable isotope data

Tobias Kluge , Philipp Holz , Elisabeth Eiche , Thomas Neumann , Alexander Land , Maximilian Schuh , Mario Trieloff & Axel K. Schmitt
High-resolution speleothem paleoclimate records with annual to seasonal resolution are helpful for detailed analysis of climatic changes with limited duration (e.g., volcanic climate impacts), but also for longer-duration events (e.g., at 8.2 ka or 4.2 ka). A high resolution paleoclimate data set is also mandatory for meaningful comparison with archaeological or historical records. Low stalagmite growth rates could impede the acquisition of high-resolution isotope data with the classical micro-milling approach and isotope ratio mass spectrometry...

How much royalties are paid for hydrocarbon and lignite explorations in Germany?

Philipp Blum & Frederic Berger
The Federal Mining Act (Bundesberggesetz, BBergG) was introduced to govern the use of the German subsurface. By paying royalties, companies obtain permissions to exploit resources in Germany. However, there is no transparent reporting on the paid royalties yet. Hence, the objective of this study is to provide an overview of the ownership and paid royalties. Furthermore, we discuss the sustainable use and management of the German subsurface. Our study shows that the subsurface is partly...

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...

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...

The Helmholtz Research Field Earth & Environment DataHub and its NFDI4Earth connection

Peter Braesicke , Roland Bertelmann , Jan Bumberger & Sören Lorenz
Digitalisation and FAIR data are overarching elements in the Helmholtz Research Field Earth and Environment (RF E&E) Program-Oriented Funding Phase IV (PoF IV). Already in the transition years from PoF III to PoF IV (2019/2020) different measures were implemented to facilitate this aim. One of them is the so-called DataHub, with the aim that all Earth System (ES) data that is generated by the RF E&E will be available as FAIR data via a common...

Ground Motion Emissions from Wind Turbines: State of the Art and Implications

Joachim Ritter & Laura Gassner
Wind turbines are massive tall buildings which swing considerably above the ground, especially when they are in operation. These oscillations are composed of the eigenmodes of the whole building and the interaction of the passing blades with the tower. The oscillations are transferred into the ground by interaction of the moving foundation with the ground (soil / rock). The radiated wavefield is composed of elastic waves, conformable to seismic waves. Mainly surface waves are excited...

Structural modelling of Agbada (Tertiary) sandstone reservoirs in “Atled Creek”, Onshore Niger Delta, Nigeria

Olajide Jonathan Adamolekun , Benjamin Busch , Idongesit Akwaowoh , Michael P. Suess & Christoph Hilgers
The distribution of rocks and rock properties is an important part of an overall strategy for reservoir development, placement of new wells and prediction of future production. It also provides a detailed look into the local development of a sedimentary basin. Here we present a case-study from the “Atled Creek” concession, onshore Nigeria. A 3D structural reservoir model of the concession was prepared from available industry seismic data and well logs. Four sandstone reservoirs within...

The fate of crustal xenoliths in carbonatite dykes of the Gross Brukkaros, Namibia

Rebecca Ruwe , Johannes Giebel & Benjamin F. Walter
The Gross Brukkaros (Namibia) reflects a broad dome structure showing a crater-shaped depression with numerous peripheral beforsitic carbonatite dykes. These dykes frequently contain an extreme load of basement (Nama-group) xenoliths (> 60 vol.%) including shales, quartzites, granites and gneisses. While xenoliths of exposed country rocks (mainly shales) show an angular habit, a pronounced rounding of xenoliths from other lithologies proves a wide transport and strong abrasion. This consumption of xenolithic material may result in remarkable...

Metallic raw material demand for hydrogen technology in the German steel production 2030

Katharina Steiger , Jochen Kolb & Christoph Hilgers
To reach Germany’s climate neutrality goal in 2045, different technological and systematical changes have to be conducted, such as the expansion of renewable energies plants, the shift towards e-mobility and the necessary infrastructure. For the measures, metallic raw materials will be increasingly required. The German government plans to support those industry sectors, which are emitting great amounts of CO2. The data evaluation on emissions and energy consumption in Germany shows that the sector "production and...

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...

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)...

Enhancing the contribution of closed systems to geothermal energy generation by increasing the ratio of generated power to the total length of wellbores

Morteza Esmaeilpour , Maziar Gholami Korzani & Thomas Kohl
Geothermal energy extraction through closed systems is a secure approach responding to the global heating demand without contaminating subsurface water and causing seismic events. However, the generated power of conventional closed systems is much lower than those of open systems. Therefore, this study is dedicated to planning a novel closed system, which can produce a significant amount of thermal power. For this purpose, the performance of a single closed-loop deep system with a lengthy horizontal...

The Kieshöhe carbonatites in SW-Namibia – the role of silicatic xenoliths for REE exploration

Benjamin Florian Walter , R. Johannes Giebel , Alan Marlow , Michael Marks , Gregor Markl & Jochen Kolb
Exploration of carbonatite-associated REE-deposits is challenging due to heterogeneous ore distribution and variable and often complex ore mineralogy. The Kieshöhe carbonatite in SW Namibia represents a subvolcanic occurrence hosting dolomite, calcite and ankerite carbonatite dykes, ring dykes and diatremes. Petrography, whole rock geochemistry and microXRF imaging provide insights into the role of silicate xenoliths for the REE mineralization in a subvolcanic environment. Xenolith-rich carbonatites are relatively REE-poor with only minor monazite mineralization, whereas xenolith-free carbonatites...

Registration Year

  • 2022

Resource Types

  • Text


  • Karlsruhe Institute of Technology
  • University of Tübingen
  • Technical University of Berlin
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
  • University of the Free State
  • Helmholtz Centre for Environmental Research
  • Helmholtz Association of German Research Centres
  • Technical University of Darmstadt
  • University of Würzburg
  • European Centre for Space Applications and Telecommunications