34 Works

Quantifying carbonate denudation from cosmogenic 36Cl and climatic and tectonic controls on carbonate landscape evolution

Richard F Ott , Sean F Gallen & David Helman
Department of Earth Sciences, ETH Zurich, Zurich, Switzerland(1);Earth Surface Geochemistry, German Centre for Geoscience Research, Potsdam, Germany(2);Department of Geosciences, Colorado State University, Fort Collins, US(3);Department of Soil and Water Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel(4);Advanced School for Environmental Studies, The Hebrew University of Jerusalem, Jerusalem, Israel(5);Quantifying carbonate denudation and the partitioning between chemical and mechanical surface lowering in karstic areas is challenging. Here...

Curating data and samples in the long-tail - tools and examples from GFZ Data Services

Kirsten Elger & Florian Ott
GFZ Data Services, an international research data repository for the Earth sciences domain and Allocating Agent for the IGSN Global Sample Number (IGSN), is operated under the umbrella of the GFZ German Research Centre for Geosciences. GFZ Data Services increases the discoverability and reusability of data through (1) the provision of comprehensive domain-specific data description via standardised and machine-readable metadata with controlled domain vocabularies; (2) complementing the metadata with comprehensive and standardised technical data descriptions...

Geochemical control of hydraulic and mechanical reservoir sandstone properties

Maria Wetzel , Thomas Kempka & Michael Kühn
University of Potsdam, Institute of Geosciences(2);Geochemical processes such as mineral dissolution and precipitation alter the microstructure of rocks, and thereby affect their hydraulic and mechanical behaviour. Quantifying and considering these property changes in reservoir simulations substantially supports risk assessments related to geological subsurface utilization. In our virtual laboratory, 3D pore-scale models of typical reservoir sandstones are applied to determine the effective hydraulic and elastic properties of sandstones. In order to adequately depict characteristic distributions of...

Authority, Identity and Ethics of Data Re-publication and Duplication

Lesley Wyborn , Kirsten Elger , Jens Klump , Kerstin Lehnert & Mingfang Wu
Today, research data is widely available in digital form, datasets are easily accessible online and the dataset creator should consider it advantageous as this leads to greater uptake. However, the downside is that digital datasets can be easily copied, duplicated in multiple places, and re-published through more than one repository or service. Particularly with web services, mirroring resources is a common practice, especially in online GIS packages and dashboards. ‘Copy WMS link’ buttons are common,...

Hipercorig Hallstatt History (H3): Accessign a deep time window of Lake Hallstatt´s preHistory

Michael Strasser, Flavio Anselmetti, Achim Brauer, Stefano Fabbri, Ulrich Harms & Kerstin Kowarik

Si isotope thermometry in silicified carbonate

Michael Tatzel , Marcus Oelze , Moritz Liesegang , Maria Stuff & Michael Wiedenbeck
Cherts, including silicified carbonates, are one of the most detailed and alteration resistant archives of near-surface environments. Yet, the information disclosed in form of stable isotope ratios of Si and O cannot be confidently translated into conditions prevailing at the Earth surface in deep time. Thermometry based on δ18O is compromised by the lack of knowledge about the fluid’s δ18O value and attempts to determine Si sources or temperatures from δ30Si remain unsatisfying. We investigated...

Sandbox – Creating and Analysing Synthetic Sediment Sections with R

Michael Dietze , Sebastian Kreutzer & Margret C. Fuchs
Geoscientific concepts and hypotheses are usually formulated based on empirical data from the field or the laboratory (induction). After translation into models they can be applied to case study scenarios (deduction). However, the other way around – expressing hypotheses explicitly by models and test these by empiric data – is a rarely touched trail. There are several models tailored to investigate the boundary conditions and processes that generate, mobilise, route and eventually deposit sediment in...

Stromatolitic microorganisms in and on top of fluid-escape structures of the 3.2 Ga Moodies Group

Sebastian Reimann , Christoph Heubeck , Martin Homann , Deon Johannes Janse van Rensburg & Michael Wiedenbeck
The global record of early life is only poorly preserved, but has an ark in the 3.2 Ga Moodies Group of the Barberton Greenstone Belt, South Africa and Eswatini. It preserves silicified photosynthetic and sulfate-reducing metabolic signatures in sandstone-dominated, terrestrial to shallow-marine strata. Large fluid-escape structures are common in thick-bedded kerogen-laminated sandstones of (sub-)tidal facies. We document and interpret silicified, massive and laminated carbonate aggregates and beds, both of likely microbial origin, within and on...

Alpine lithospheric strength and its relation to seismicity distribution

Cameron Spooner, Magdalena Scheck-Wenderoth & Mauro Cacace
GFZ Potsdam, Germany (1); Potsdam University, Germany (2); RWTH Aachen University, Germany (3)

Despite the amount of research focused on the Alpine orogen, different hypotheses still exist regarding varying seismicity distribution patterns throughout the numerous crustal blocks of different physical properties that comprise the region. The thermal field, also varying as a consequence of heterogeneous lithospheric properties, is a key controlling factor for rock strength via thermally activated creep and it exerts a first...

Modelling of fault slip: beyond Mohr-Coulomb?

Mauro Cacace, Guido Blöcher, Antoine B. Jacquey, Hannes Hofmann, Arno Zang , Günter Zimmermann, Oliver Heidbach, Christian Kluge & Magdalena Scheck-Wenderoth
GFZ, German Research Centre for Geosciences, Potsdam, Germany (1); MIT, Massachussets Institute of Technology, Cambridge, MA, USA (2); RWTH Aachen University, Aachen, Germany (3)

In this study, we carry out an evaluation of the potential for induced seismicity arising from hydraulic stimulation of low to intermediate enthalpy porous reservoirs, by taking the geothermal reservoir of Groß Schönebeck (northern Germany) as study case. The aim is to evaluate the spatial and temporal distribution of 26...

The Paleozoic supercontinent cycle and regional tectonics

Uwe Kroner , Tobias Stephan & Rolf L. Romer
TU Bergakademie Freiberg(1);GFZ Potsdam, Germany(2);University of Calgary, Canada(3);Ancient plate boundary processes define the first order architecture of consolidated continental crust. Therefore, regional tectonic features allow for the reconstruction of plate tectonic processes. Here we explain the Paleozoic tectonics of various orogens of Europe and both Americas in terms of the Pannotia – Pangea supercontinent cycle. Early Paleozoic separation of Gondwana and Siberia from the eastern and western edges of North America, respectively, is compensated by...

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...

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...

Large hydraulic diffusivity of a single fault

Qinglin Deng , Guido Blöcher , Jean Schmittbuhl & Mauro Cacace
We provided an approach to estimate hydraulic diffusivity of a single fault by solving the linear diffusion equation in a partly open rough fracture under drained conditions when applying small pressure drop fluctuations (10^-5 Pa) along the fault. In contrast to the traditional calculation for the fracture hydraulic diffusivity using parameters such as hydraulic aperture, fluid compressibility, fluid viscosity, we here directly used time-dependent pressure profile p(x, y, t) to match the analytical solution for...

Data Journals - Bridging the worlds of data and research

David Carlson , Kirsten Elger , Jens Klump , Ge Peng & Johannes Wagner
In less than one decade the open-access data journal Earth System Science Data (ESSD, a member of the Copernicus Open Access Publisher family) grew from a start-up venture into one of the highest-rated journals in global environmental science. Stimulated by data needs of the International Polar Year 2007-2008, ESSD now serves a very broad community of data providers and users, ensuring that users get free and easy access to quality data products and that providers...

Cliff coast collapses driven by nested biological, astronomical and meteorological activity cycles

Michael Dietze , Kristen L. Cook , Luc Illien , Oliver Rach & Niels Hovius
Cliffs line many erosional coastlines. Localized failures can cause land loss and hazard, and impact ecosystems and sediment routing. Links between cliff erosion and forcing mechanisms are poorly constrained, due to limitations of classic approaches. Combining multi-seasonal seismic and drone surveys, wave, precipitation and groundwater data we study drivers and triggers of 81 failures along the chalk cliffs on Germany’s largest island, Rügen. We have found that marine processes are negligible in triggering failures but...

Studying glacial/interglacial cycles from downhole logging data: an application to the ICDP drilling project Lake Junín, Peru

Simona Pierdominici, Christian Zeeden , Jochem Kück , Donald Rodbell & Marc Abbott
Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ, Germany (1); Leibniz Institute for Applied Geophysics, Hannover, Germany (2); Union College, Schenectady, NY 12308, USA (3); Dep. Of Geology and Planetary Science, University of Pittsburg, USA (4)

Can the history of the lake records covering the glacial-interglacial cycles be reconstructed from downhole logging data without the high-resolution data derived from core analysis? To answer this question, we present a study reconstructing glacial-interglacial sediment variability and an estimate...

Simulation study of hydrate formation from dissolved methane in the LArge-scale Reservoir Simulator (LARS)

Zhen Li , Thomas Kempka , Erik Spangenberg & Judith Schicks
Hydrate formation from dissolved methane in saline solutions is a hydrochemical process, resulting in the accumulation of gas hydrates in sedimentary strata under the seafloor or overlain by permafrost regions. In the scope of the SUGAR framework, LARS has been established to study gas hydrate formation processes and dissociation strategies under in-situ conditions. In the latest hydrate formation experiments, key parameters have been applied to mimic the local marine environment of the Mallik site, Canada....

Revised and improved geological model of the Waiwera geothermal reservoir, New Zealand

Andreas Grafe , Thomas Kempka , Michael Schneider & Michael Kühn
Following a thermal and photogrammetric outcrop mapping campaign undertaken at the Waiwera geothermal reservoir in 2019, a pre-existing 3D hydrogeological model was revised in the present study to assess the impact of the updated structural and lithological interpretation on the existing numerical model calibration. For the latter, well data comprising measured temperature and salinity profiles were employed to reconstruct the reservoir’s natural thermal state and spatial distribution of salinity, supported by numerical simulations of density-driven...

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...

Structure and density configuration of Germany’s subsurface: 3-D-Deutschland, an updated three-dimensional lithospheric-scale model

Denis Anikiev , Judith Bott , Mauro Cacace , Hans-Jürgen Götze & Magdalena Scheck-Wenderoth
With this study we revise and improve the three-dimensional lithospheric-scale structural and density model of Germany (3-D-D). Major shortcomings of this model resulted from joining three regional 3-D models that were poorly covered by data at their margins. Merging into a larger model revealed structural inconsistencies in these “marginal” domains. In order to resolve discrepancies between the units in a more consistent way we integrate newly available data from seismic reprocessing, tomography, and use 3-D...

Magnesium and calcium isotope fractionation during microbial dolomite formation

Michael Tatzel , Adina Paytan , Samantha Carter , Daniel A. Frick , Francisca Martinez-Ruiz , Zach A. DiLoreto , Maria Dittrich , Tomaso R. R. Bontognali & Mónica Sanchez-Román
Microbial mediation is considered an important process for the formation of primary dolomite at ambient temperature. Yet, no structural, mineralogical, chemical or isotopic means exist to discern this mode of dolomite formation from secondary dolomite. To explore the utility of metal isotopes in allowing this distinction we characterize magnesium and calcium stable isotope ratios in primary (proto)dolomites from a modern hypersaline environment. Samples from the Khor Al-Adaid sabkhas in Qatar show consistent isotopic differences of...

Uncertainty Quantification for Geothermal Basin- and Reservoir-Scale Applications

Denise Degen, Mauro Cacace, Magdalena Scheck-Wenderoth, Karen Veroy & Florian Wellmann
Numerical simulations of the governing geophysical processes are crucial for geothermal applications in order to characterize the subsurface. This characterization presents us with major challenges ranging from the correct physical and geometrical characterization to the quantification of uncertainties. Quantifying rock physics uncertainties and performing other probabilistic inverse methods is, even with current state-of-the-art finite element solver and high-performance infrastructures, computationally not feasible for complex basin- and reservoir-scale geothermal applications due to the large spatial, temporal,...

Latest results from the hybrid micro-gravity monitoring of the Theistareykir geothermal field (North Iceland)

Nolwenn Portier , Jacques Hinderer , Florian Schäfer , Philippe Jousset , Kemal Erbas , Vincent Drouin , Vincent Drouin , Freysteinn Sigmundsson , Ingwar Magnusson , Gylfi Pall Hersir , Kristjan Agustsson , Agrismur Gudmundsson , Egill Juliusson , Hreinn Hjartasson , Hreinn Hjartasson & Jean-Daniel Bernard
Geothermal energy represents around 30% of the produced electricity in Iceland with a cumulative capacity being equal to 755 MWe (Ragnarsson et al., 2020). In particular, the Theistareykir geothermal plant, which is located on the Mid-Atlantic ridge in North Iceland, produces 90 MWe using two turbines in operation since autumn 2017 and spring 2018, respectively. We will report on the hybrid micro-gravity monitoring and discuss how this technique will contribute to the sustainable management of...

Hydro-mechanical parameters of Cornubian and Odenwald reservoir granitoids with focus on fracture stiffness testing

Lena Muhl , Guido Blöcher , Ingo Sass , Christian Kluge & Tanja Ballerstedt
For the resource development, geothermal systems need to be improved to increase the profitability of the investment. One aspect to support this aim is the reservoir productivity, a key parameter, which depends on the hydraulic and mechanical properties of the reservoir formation. In order to develop possible improvement strategies for the profitability enhancement of geothermal reservoirs and/or nuclear waste repositories, hydraulic and mechanical properties of artificial generated fractures were investigated. The importance of the fracture...

Registration Year

  • 2022
    31
  • 2021
    3

Resource Types

  • Text
    34

Affiliations

  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
    34
  • Freie Universität Berlin
    6
  • University of Potsdam
    4
  • RWTH Aachen University
    4
  • Helmholtz Centre for Environmental Research
    3
  • University of Göttingen
    3
  • Karlsruhe Institute of Technology
    3
  • Technical University of Darmstadt
    3
  • Columbia University
    2
  • University of Strasbourg
    2