24 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...

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...

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,...

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...

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

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....

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...

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...

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,...

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...

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...

Thermo-compositional models of the West Gondwana cratons

Nils-Peter Finger , Mikhail K. Kaban , Magdala Tesauro , Walter D. Mooney & Maik Thomas
When Western Gondwana broke apart into the South American and African continents ca.120 Ma ago, some of its cratons were broken apart as well. Following the isopycnic hypothesis, their long-term stability and often neutral to positive buoyancy can be explained by the counteracting effects of cooling (density increase) and iron depletion (density decrease). To separate these effects, we created the presented models following an iterative integrated approach using mainly seismic and gravity data. In the...

Time-dependent fracture permeability induced by fluid-rock interactions under intermittent and continuous flow

Chaojie Cheng & Harald Milsch
Fractures are the predominant flow pathways in low-permeability rocks. Understanding the fluid-rock interactions that occur in rock fractures and their effects on fracture aperture variations is important for assessing the sustainability of reservoir productivity. This study presents two long-term flow-through experiments with fractured pure quartz sandstones to investigate how fluid composition affects fracture changes over time. One sample was continuously flowed through with fluids (DI or Si-rich fluid), while the other sample was subjected to...

Hydro-Mechanical Simulation in Geothermal Reservoirs: Physics and Surrogate Modeling

Ryan Santoso , Denise Degen , Mauro Cacace & Florian Wellmann
Hydro-mechanical (HM) simulations are essential aspects of geothermal reservoir studies to assess the heat production and the associated-environmental impacts, such as seismicity. HM simulations are numerically expensive (especially for large-scale simulations) since they require a relatively fine mesh to capture the complex interplay between the fluid-flow and geomechanical processes. This aspect makes it difficult to perform detailed studies on uncertainties in HM simulations. In this work, we present a comprehensive review and numerical demonstrations about...

GeoLaB - Geothermal Laboratory in the Crystalline Basement

Thomas Kohl , Eva Schill , Judith Bremer , Günter Zimmermann , Olaf Kolditz & Ingo Sass
In Central Europe, the largest geothermal potential resides in the crystalline basement rock with important hotspots in tectonically stressed areas. To better harvest this energy form under sustainable, predictable and efficient conditions, new focused, scientific driven strategies are needed. Similar to other geo-technologies, the complex processes in the subsurface need to be investigated in large-scale facilities to ensure environmental sustainability. The proposed new underground research laboratory GeoLaB (Geothermal Laboratory in the Crystalline Basement) will address...

Registration Year

  • 2022
    21
  • 2021
    3

Resource Types

  • Text
    24

Affiliations

  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
    24
  • Freie Universität Berlin
    4
  • RWTH Aachen University
    4
  • University of Potsdam
    3
  • University of Strasbourg
    2
  • University of Göttingen
    2
  • Commonwealth Scientific and Industrial Research Organisation
    2
  • Technical University of Darmstadt
    2
  • Helmholtz Centre for Environmental Research
    1
  • VU Amsterdam
    1