35 Works

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...

X-ray absorption spectroscopy study of Mn reference compounds for the identification and quantification of Mn species in soils

Teresa Zahoransky , Anna V. Wegorzewski , Winnie Huong & Christian Mikutta
Chemical reactivity, mobility, and bioavailability of manganese (Mn) in the environment depend crucially on its speciation. Despite the broad application of X-ray absorption spectroscopy (XAS) to environmental samples, studies covering the identification and quantification of Mn species in soils are surprisingly scarce. In this study, we analyzed 32 organic and inorganic Mn reference compounds by Mn K-edge (6,539 eV) XAS to assess the potential of XAS to differentiate various Mn coordination environments in soils. X-ray...

Geology across borders - Towards a consistent interpretation of the subsurface in the Central North Sea covering the Dutch, German and Danish offshore areas.

Hauke Thöle , Fabian Jähne-Klingberg , Maryke den Dulk , Hans Doornenbal, Finn Christian Jakobsen & Peter Britze
Geology does not follow national borders and for many areas of application, it is essential to know the characteristics of the subsurface on both sides of the border. In the area of the North Sea, however, consistent interpretation of the subsurface across borders are rare, as most studies carried out here by the Geological Survey Organizations (GSOs) in charge have remained confined to their national territories. As a consequence, the interpretations are often not aligned...

Large-scale quantification of Li in spodumene pegmatite using Laser Induced Breakdown Spectroscopy

Simon Müller & Jeannet Meima
Spatially detailed surface analysis of geological samples and drill cores offers insight into element and mineral distributions on large scales, an important information in ore exploration processes. Laser Induced Breakdown Spectroscopy (LIBS) is an uprising technology that allows fast in-situ geochemical measurements directly on a sample surface under atmospheric conditions. Since nearly no sample preparation is needed, the technology is suitable for spatially-resolved measurements on large samples such as drill cores. LIBS also allows the...

Cementation rates of detrital platform carbonates and sequence stratigraphic implications

Thomas Mann & Hildegard Westphal
Different views exist on the prevalent processes that control transport and deposition of detrital platform carbonates in a sequence stratigraphic framework. While some models indicate that meteoric cementation during sea-level lowstands retards sediment transport into deeper basins, others imply marine cementation during highstands as dominant process affecting the architecture of carbonate depositional sequences. These opposing views are based on observations from the Bahamian archipelago, an isolated carbonate platform with a significantly higher carbonate saturations state...

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...

Hyperspectral analysis of lacquer peel profiles as quasi-in-situ analysis for tailings exploration

Wilhelm Nikonow & Dieter Rammlmair
Three lacquer peel profiles were prepared from a copper tailings deposit in Central Chile. The peels were taken from two sides at varying depths of the tailings heap. Parallel to that, samples were taken from each layer within the peels for bulk XRF analysis and particle size analysis. The peels were analysed by Hyperspectral Imaging (HSI, VNIR- SWIR, 400 – 2500 nm wavelength) with the Specim SisuRock system and µXRF mapping using M4 Tornado Plus...

The carbonatites of South Morocco: Unusual occurrences and associated REE-Nb-Ta-Fe mineralization

Rachid Benaouda , Dennis Kraemer , Maria Sitnikova & Michael Bau
The Oulad Dlim massif in the southernmost part of Morocco hosts several carbonatite bodies of different ages. The older carbonatite (1.85 Ga) occurs in the eastern Oulad Dlim massif in the Gleibat Lafhouda area and consists of three juxtaposed magnesiocarbonatite outcrops. They are associated with glimmerite, hosted by Archean gneiss, and unusually intruded by massive IOA deposits. The latter contains up to several wt% REE related to numerous monazite-(Ce) inclusions within large apatite crystals. Columbite-(Fe)...

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...

Tetravalent uranium mobilization by complexation or oxidation and associated U isotope fractionation

Yvonne Roebbert , Chris Daniel Rosendahl , Ashley Brown , Axel Schippers , Rizlan Bernier-Latmani & Stefan Weyer
Uranium (U) isotopes are suggested to monitor the success of (bio)remediation relying on the reduction of soluble and mobile U(VI) to less soluble U(IV)1. However, the subsurface stability of U(IV), typically present as solid-phase non-crystalline U, may be affected by complexation or oxidation. Understanding these processes and their impact on U isotope fractionation is important to correctly interpret field U isotope signatures. We investigated U mobilization by complexation and oxidation and measured the associated U...

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...

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...

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...

µ-EDXRF based classification of chromites. A quick approach for testing hand specimen and drill cores.

Dieter Rammlmair & Wilhelm Nikonow
Chromites from ophiolites and layered intrusions show a wide variety in Cr#, Mg# and Cr/Fe ratios. These ratios provide information on the genesis of the chromite deposits e.g. the place of formation. By means of µ-EDXRF this information can be obtained in a very quick way from cut hand specimen. Unfortunately, chromites show a number of very intensive diffraction signals due to the polychromatic beam of the µ-EDXRF system, which even after calculating the minimum...

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,...

New raw materials from old mines? – Examples from historic mining sites in Europe

Henrike Sievers
Europe is largely dependent on raw materials imports and has to supply its needs, especially of critical raw materials, from international sources. Nevertheless, Europe also has a long lasting mining history and some deposits have been mined continuously even for hundreds of years. Within the GeoERA the project FRAME investigates traditional mining sites and their raw material potential. In addition to the main commodities of these historic deposits, the project focuses on strategic raw materials...

On the infrasound emission generated by wind turbines

Lars Ceranna , Peter Gaebler, Gernot Hartmann, Patrick Hupe, Christoph Pilger & Andreas Steinberg
Aerodynamic infrasonic signals generated by wind turbines can be detected by highly sensitive micro-barometers showing spectral peaks at the blade passing harmonics, which are above the background noise level. As infrasound is one of the four verification technologies for the compliances with the Comprehensive Nuclear-Test-Ban Treaty (CTBT), decreases in detection capability for dedicated infrasound arrays have to be avoided. Therefore, preventing such decrease is particularly important for the two German infrasound stations IS26 in the...

Groundwater resources in northern Namibia

Georg J. Houben
The transboundary Cuvelai-Etosha Basin (Namibia/ Angola) is a semi-arid region. Rising population and water demand increase the stress on already scarce water resources. The local aquifers, the perched KOH-0 and the deeper KOH-1 are of limited use, the former due to low yields and microbiological issues, the latter due to often brackish water. A previously unknown deep freshwater aquifer, KOH-2, with high yield and good water quality was discovered at the end of the 1990s....

The effect of Co substitution and sample preparation on the Raman spectra of pyrite

Khulan Berkh & Dieter Rammlmair
Effect of Co substitution in pyrite was investigated using a Raman microprobe. Textural appearance of Co-bearing pyrite was visualized by mapping method. The revealed Raman map tightly correlates with a Co distribution map obtained by electron microprobe and µ-energy-dispersive X-ray fluorescence microscope. In addition, a strong influence on the pyrite spectra due to sample preparation was documented. The standard mechanical polishing caused highly broadened modes at upshifted frequencies, which could be avoided by analyzing of...

Unique islets in SE Asia: How Holocene climate and sea-level controlled growth of a coral reef island

Yannis Kappelmann, Hildegard Westphal, André Wizemann & Thomas Mann
Coral reef islands are unconsolidated landforms, composed of skeletal carbonate from surrounding reefs and related ecosystems. Facing the predicted rise of sea-level and a changing environment in the next decades, response of low-lying coral reef islands is of great scientific and public interest. To better estimate future behavior, it is necessary to know and classify the effects of past environmental changes on the sedimentary system. In SE Asia, sedimentological understanding of the development of these...

Wind turbine signatures from long distances at the Gräfenberg Array

Klaus Stammler & Lars Ceranna
Since 2012 many wind turbines have been installed on the Frankonian Jura and a number of them also in the vicinity of stations of the Gräfenberg array (GRF), consisting of 13 broadband stations within an area of about 50x100 km. It has been shown that these turbines take a significant effect on the noise level at many of the GRF station sites (Stammler & Ceranna, 2016, reference below). The array as a whole suffers from...

Methane seepage in the northwestern part of the German North Sea

Miriam Römer , Martin Blumenberg , Katja Heeschen , Stefan Schlömer , Hendrik Müller , Simon Müller , Christian Hilgenfeldt , Udo Barckhausen & Katrin Schwalenberg
We studied seafloor characteristics, water column anomalies, and sediment methane geochemistry in the German sector of the central North Sea during a research cruise with the German research vessel Heincke in summer 2019. An extensive hydroacoustic mapping campaign revealed the presence and distribution of flares in the water column, indicative for gas bubble releases as well as for geophysical subsurface indications of elevated gas concentrations. We analyzed the spatial distances of detected flares to subsurface...

On Mesozoic uplifts along the SW edge of the East European Craton – new insight from regional onshore (PolandSPAN) and offshore (BalTec) seismic reflection data from Poland

Piotr Krzywiec , Łukasz Słonka , Aleksandra Stachowska , Quang Nguyen , Michał Malinowski , Christian Huebscher , Regina Kramarska & Niklas Ahlrichs
East European Craton (EEC) in Poland has been recently studied by onshore PolandSPAN and offshore BalTec regional seismic surveys. PolandSPAN data imaged earliest Late Jurassic, earliest Late Cretaceous and mid-Late Cretaceous laterally extensive unconformities that document hitherto unknown substantial uplifts of the SW edge of the EEC. Cretaceous unconformities might have been formed as a result of inversion-induced buckling of the cratonic edge. BalTec offshore survey was acquired within the transition zone between the Paleozoic...

Latest Achievements with drill core scanning based on Laser Induced Breakdown Spectroscopy applied to 6 meter of drill core through Merensky Reef, Bushveld Complex, South Africa

Jeannet Meima , Dieter Rammlmair & Malte Junge
A 6-meter drill core from Merensky Reef, Bushveld Complex, South Africa, was scanned in detail with a drill core scanner based on Laser Induced Breakdown Spectroscopy. The purpose of the investigation was to visualize variations in the chemical composition along the core, and following a mineral classification of the LIBS data, of variations in the mineral chemical composition as well. The LIBS technology is based on atomic emission spectroscopy, in which the excitation of the...

Long-term mechanical behavior of claystone

Sibylle Irene Mayr
For decades, claystone is investigated as a likely host rock material for the deep geological disposal of highly radioactive waste. To ensure safe operation, knowledge about the long-term (thermo-hydro-) mechanical behavior of clay rock is of significant relevance: How will the excavation induced differential stresses gradually dissipate while causing convergence? Laboratory triaxial tests on the mechanical behavior allow for the controlling of major and minor principal stress (differential stress), pore pressure (effective stress), saturation, temperature...

Registration Year

  • 2022

Resource Types

  • Text


  • Federal Institute for Geosciences and Natural Resources
  • University of Bremen
  • Leibniz Centre for Tropical Marine Research
  • Norwegian Geological Survey
  • National Laboratory of Energy and Geology
  • Geological Survey of Denmark and Greenland
  • Leibniz University Hannover
  • Instituto Geológico y Minero de España
  • //ror.org/019w00969:Leibniz-Zentrum für Marine Tropenforschung (ZMT), Bremen, Germany
  • Hasanuddin University