307 Works

Short-term terrestrial climate variability through MIS 3 and Termination 1

Daniel. Veres
Marine Isotope Stage (MIS) 3 represents a critical interval for understading the response of terretrial environments to rapid climate change driven by orbital focring. As the primary constituent of loess and a major driver in global climate forcing, mineral dust serves as a proxy that allows for direct comparison of loess data with chronologically better resolved ice and lake records. Motivated by the recent emergence of high-resolution magnetic and sedimentological data on European loess-paleosol profiles,...

Sustainability in energy storages - How modern geoscience concepts can improve underground storage monitoring

Benjamin Haske , Tobias Rudolph & Bodo Bernsdorf
Technische Hochschule Georg Agricola, Germany(1);Re-using of large-volume salt caverns for the intermediate storage of liquid and gaseous energy carriers is an indispensable step on the way to a sustainable energy economy. Continuous development of methods for monitoring these facilities is a crucial part of the social license to operate. In the research project "Monitoring system for the safety of cavern storage facilities using satellite and unmanned aerial system (UAS) data" (KaMonSys), safety solutions for critical...

Millennial variability, hydrological and limnological changes during MIS3-2 in Lake Petén Itzá, Guatemala

Rodrigo Martinez-Abarca, Michelle Abstein , Philipp Hoelzmann , Thorsten Bauersachs , Liseth Pérez , Mona Stockhecke , Sergio Cohuo Duran & Antje Schwalb
Heinrich Stadials and Greenland Interstadials are abrupt climate variations that are observed in the Northern Hemisphere throughout Marine Isotopic Stages (MIS) 3-2. Lake Petén Itzá, northern Guatemala, is a key site for paleoclimate investigations due to its sensitivity to changes in climate forcing such as the Intertropical Convergence Zone (ITCZ) and the Atlantic Meridional Overturning Circulation (AMOC). In this study, we reconstructed the hydrology and limnology of Lake Petén Itzá during MIS3-2 based on geochemical...

Paleoclimate reconstruction using Pleistocene paleosols along the middle Atbara River in Eastern Sudan

M. Mohammednoor, Robert Bussert , S. Tsukamoto , M. Richter , O. El Bedri , B. Kraatz , K. Salih , J. Müller , A. Eisawi & F. Bibi
Along the middle Atbara River, Pleistocene alluvial sediments dated to ~200 to 20 ka are exposed in eastern Sudan over a length of about 200 km with a maximum thickness of 50 m. The Atbara River today has its headwaters in the northern Ethiopian Plateau and is the last major tributary of the Nile before it flows through the Sahara. Previous studies and our fieldwork since 2018 have resulted in extensive finds of fossil terrestrial...

Deposition of Subglacial Lake Sediments underneath the Laurentide Ice Sheet? – Sediment Cores from Lake Melville, Canada, provide first Evidence

Sophie Kowalski, Christian Ohlendorf, Jens Matthiessen & Andrea Catalina Gebhardt
Lake Melville is a fjord-type lake located in Labrador, Eastern Canada, as part of the Hamilton Inlet System. It is significantly characterised by its eastern connection to the Labrador Sea through a shallow sill at the entrance to the Rigolet Narrows. In contrast, the western part of the lake receives freshwater input from several major rivers. Previous studies assumed that Lake Melville was fully excavated by the Laurentide Ice Sheet (LIS) during the last glacial....

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...

Carbonate microfacies and transgressive-regressive cycles of Oxfordian shallow-water limestones (Korallenoolith, Lower Saxony Basin)

Deyan Zhang , Stefan Huck & Ulrich Heimhofer
During the Oxfordian stage, the Lower Saxony Basin (LSB) was covered by a shallow epicontinental sea (Ziegler 1990), in which a thick succession of marine limestones and marls was deposited. Unfortunately, the scarcity of open marine marker fossils and numerous sedimentary gaps make it diffcult to correlate strata from the LSB with Oxfordian deposits elsewhere in the world (Betzler et al. 2007; Zuo et al. 2017). In a first step, this study therefore aims at...

Levelized costs and economic impacts of geothermal district heating networks: a decision tree analysis

Astu Sam Pratiwi & Evelina Trutnevyte
Geothermal district heating networks are among the key options to decarbonize the heating sector in the State of Geneva in Switzerland. But the development of geothermal district heating requires high capital costs and involves risk of not finding sufficient geothermal resources, which make these systems less competitive. On the other hand, building geothermal district heating creates a wider impact on the economy, domestically and overall. But such impact has rarely been evaluated. Our study aims...

Parametric optimization and comparative study of an organic Rankine cycle power plant for two-phase geothermal sources

Chaofan Chen , Francesco Witte , Ilja Tuschy , Olaf Kolditz & Haibing Shao
For two-phase geothermal resource, Organic Rankine Cycle (ORC) based binary plant is often applied for power production. In this work, a network topology was built with the Thermal Engineering Systems in Python (TESPy) software to simulate the stationary operation of the ORC plant. With this topology, the performance of nine different working fluids are compared. From the thermodynamic perspective, the gross and net power output is optimized respectively. Results show that R600 has the highest...

Geothermal potential and opportunities in Vietnam

Viet Cao
Located between the Pacific Ring of Fire and Alpide Belt, Vietnam possesses significant potential geothermal resources, with more than 300 hot spring sites with temperatures from 40oC to 100oC have been detected in the territory. Based on available data, Vietnam is estimated to have a geothermal potential of up to 400 MW power generation. A pilot 25MW power plant was constructed in 2013 in Đakrông - Quảng Tri Province, central of Vietnam. From geothermal measurements...

The value of heat interconnection pipelines in the use of deep geothermal energy

Markus Loewer , Maximilian Keim , Anahi Molar-Cruz & Christopher Schifflechner
Over the past fifteen years, Bavaria has become a hotspot for deep geothermal utilization in Europe. There are now 24 plants operating in the Molasse Basin that provide climate-friendly heat, electricity and cooling. For example, the state capital plans to cover its district heating supply in a climate-neutral manner and largely from deep geothermal energy by 2040. However, the use of deep geothermal energy is not limited to Munich. The demand for space heating and...

Simulation of flow through a single fracture calibrated with air permeameter measurements

Marco Fuchs , Sina Hale , Gabriel C. Rau , Kathrin Menberg & Philipp Blum
Determining fluid flow through natural fractures is an important task in many geoscience-related fields, such as geothermics. In order to estimate crucial parameters of single fractures controlling the flow and flow distribution, for example hydraulic apertures, hydro-mechanical numerical models have been established in recent years in addition to experimental methods. Although models enable a greater variety of analyses, they still require time-consuming processing before and after the simulation. This study presents a novel workflow for...

Seismic Monitoring of DeepStor: Using low-cost sensors for ambient noise correlation methods and Citizen Science

Johannes Käufl , Eva Schill & Thomas Kohl
DeepStor is an experimental facility with the goal to investigate High Temperature Aquifer Thermal Energy Storage (HT-ATES) systems at KIT Campus North. The operational seismic monitoring of DeepStor includes a network of five broadband and one borehole seismometer. In addition, we plan to install a scientific monitoring network with low-cost seismometers (such as the Raspberry Shake and the Quakesaver Hidra) to test innovative monitoring methods and for a Citizen Science project. Ambient noise tomography and...

CDGP- a gateway to geothermal data in Alsace

Marc Schaming , Mathieu Turlure , Marc Grunberg & Jean Schmittbuhl
The CDGP [https://cdgp.u-strasbg.fr], Data Center for Deep Geothermal Energy, was created in 2016 by the LabEx G-Eau-Thermie Profonde (continuing now in ITI GeoT) [https://geot.unistra.fr/], to archive the high-quality data collected in the Upper Rhine Graben geothermal sites and to distribute them to the scientific community for R activities, taking Intellectual Property Rights into account. It manages seismological (catalogues, waveforms, focal mechanisms), seismic, hydraulic, geological, and other data related to anthropogenic hazard from different phases of...

Exploration of the geologic and hydrogeologic conditions for a medium deep borehole high-temperature thermal energy storage system at TU Darmstadt, Germany

Lukas Seib , Bastian Welsch , Matthis Frey , Claire Bossennec , Kristian Bär & Ingo Sass
Solutions for seasonal energy storage systems are an essential component for the reliable use of fluctuating renewable energy sources and to bridge the gap between abundant heat availability from renewable sources in summer and an increased heat demand in winter. As a part of the research project ’solar crystalline borehole thermal energy storage system‘ – ‘SKEWS’, a field-scale demonstrator for a medium deep borehole thermal energy storage (BTES) system with a maximum depth of 750...

Gravity survey in delineating geologic features of interest for deep geothermal use at Campus North of KIT.

Maximiliano Pavez , Natalia Cornejo , Florian Bauer & Eva Schill
The seasonal mismatch of the thermal energy demand can be addressed by thermal energy storage systems of high capacity (e.g. Lee 2013). In this scenario, High-temperatures aquifer thermal energy storage systems (HT-ATES), which commonly supply domestic needs could expand to meet heating or industrial processes demands by storing excess heat. DeepStor is a planned scientific infrastructure that address the demonstration the concept of HT-ATES in former hydrocarbon reservoirs of deep sedimentary rocks. Specifically, the concept...

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...

Transition from hydrocarbon production to geothermal heat storage in the Upper Rhine Graben – the DeepStor project

Eva Schill , Jens Grimmer , Katharina Schätzler , Kai Stricker , Judith Bremer & Thomas Kohl
The subsurface conditions of the Upper Rhine Graben are favorable for the development of novel geothermal utilization concepts. In particular, they allow optimization of energy use with flexible heat production and storage scenarios. A first potential analysis revealed an enormous storage potential of formerly used and well-explored oil fields. The involvement of former hydrocarbon reservoirs as components of geothermal concepts perfectly symbolizes the transition from the fossil-fuel age to the use of carbon-neutral renewable energies....

Feasibility Study of Monitoring Delft Geothermal Project Using Land Controlled-Source Electromagnetic Method

Mahmoud Eltayieb , Dieter Werthmüller , Guy Drijkoningen & Evert Slob
Delft geothermal project (DAPwell) is a planned geothermal well doublet, where relatively cold water is going to be injected through one well into a low enthalpy geothermal reservoir to produce hot water from the other well. The volume of the cold water around the injection well will increase over time and, in the end, result in a thermal breakthrough. Thus, it is essential to trace the time-lapse change in the volume of the cold water...

Design and application of messenger nanoparticle tracers for multi-parameter reservoir exploration

Laura Spitzmüller , Jonathan Berson , Bastian Rudolph , Fabian Nitschke , Thomas Schimmel & Thomas Kohl
The inaccessibility of geothermal reservoirs makes the accurate determination and monitoring of reservoir properties and conditions difficult and is a major problem in reservoir engineering. We present an approach for the development of messenger nanoparticle tracers for the simultaneous determination of flow paths ("tracer") and reservoir properties ("messenger"), with a proof-of-concept example of flow-through experiments and temperature detection under controlled laboratory conditions. For this, silica particles are synthesized with a two-layer architecture, an inner closed...

Industrial revolution 4.1 - Critical raw materials and their role in the shift towards renewable energy generation and e-mobility

Ernst Bernhard Teigler , Stephan Peters & Torsten Gorka
Most countries are by now committed to the Paris Agreement, which deals mainly with the reduction of greenhouse gas emissions and financing thereof. Crucial pillars driving this greenhouse gas diminution are renewable energies and e-mobility. As in any industrial revolution, this fundamental shift from “fossil energy” towards renewable energies and e-mobility, requires new technologies and associated new suite of raw materials, without which this shift will not be possible or at least significantly delayed. Energy...

Reassessing evidence of Moon-Earth dynamics: No evidence of shorter lunar months from tidal bundles at 3.2 Ga (Moodies Group, Barberton Greenstone Belt)

Christoph E. Heubeck & Tom Eulenfeld
The sole Archean data point to reconstruct past orbital parameters of the Earth’s moon is from the Moodies Group (ca. 3.22 Ga) of the Barberton Greenstone Belt. From time-series analysis of tidal bundles of a subaqueous sand wave, Eriksson and Simpson (2000) suggested that the Moon’s anomalistic month at 3.2 Ga was closer to 20 days than the present 27.5 days. This is in apparent accordance with models of orbital mechanics which place the Archean...

Source of metals in ultramafic-hosted VMS deposits: insight from the Troodos ophiolite and ODP Hole 735B

Clifford Patten , Malte Junge & Alexandre Peillod
Volcanogenic massive sulfide (VMS) deposits associated with mafic-ultramafic rocks show strong structural control and are located at or in the vicinity of low angle detachment faults such as oceanic core complexes (OCC) in mid-ocean ridge environments. These ultramafic VMS deposits are variably enriched in precious (Au-Ag) critical (Co) and the base metals Cu, Zn, and Ni but the source of the metals remains poorly known. The Troodos ophiolite, Cyprus, and the ODP Hole 735B on...

The data publication chain of the EPOS Multi-scale Laboratories

Geertje ter Maat & the MSL Team
EPOS (the European Plate Observing System) is a pan-European e-infrastructure framework with the goal of improving and facilitating the access, use, and re-use of Solid Earth science data. The EPOS Thematic Core Service Multi-scale Laboratories (TCS MSL) represents a community of European Solid Earth sciences laboratories including rock and magma high-temperature and high-pressure experimental facilities, electron microscopy, micro-beam analysis, analogue modelling of tectonic, geodynamic, and volcanological processes, paleomagnetism, and analytical laboratories. Experimental data from these...

Sequence stratigraphy of the Moodies Group (3.2 Ga), Barberton Greenstone Belt, South Africa

Deon J. Janse van Rensburg , Christoph Heubeck & Sebastian Reimann
The Moodies Group (~3.2 Ga) of the Barberton Greenstone Belt is one of the oldest and best-preserved shallow-water siliciclastic sequences. It also harbors one of the largest occurrences of Paleoarchean microbial mats and the oldest record of early Earth-Moon dynamics. The extent (ca. 40 km * 70 km), lithologic and alluvial-to-prodeltaic facies diversity (incl. paleosols, pedogenic concretions and microbial mats etc.) , good outcrop, and excellent preservation of Moodies strata allows the recognition of mappable...

Registration Year

  • 2022
    307

Resource Types

  • Text
    307

Affiliations

  • Karlsruhe Institute of Technology
    46
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
    31
  • Federal Institute for Geosciences and Natural Resources
    17
  • Technical University of Darmstadt
    13
  • University of Bremen
    10
  • RWTH Aachen University
    9
  • University of Tübingen
    8
  • Ludwig-Maximilians-Universität München
    8
  • University of Strasbourg
    7
  • ETH Zurich
    7