A5084579391- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Geochemistry and Elemental Analysis
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Geochemistry and Geologic Mapping
- Heavy metals in environment
- Groundwater and Isotope Geochemistry
- Aquatic and Environmental Studies
- Marine and environmental studies
- Mine drainage and remediation techniques
- Geological Modeling and Analysis
- Geological formations and processes
- Underwater Acoustics Research
- Healthcare Systems and Public Health
- Water Resources and Management
- Geomagnetism and Paleomagnetism Studies
- Aeolian processes and effects
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- CO2 Sequestration and Geologic Interactions
- Water Quality and Pollution Assessment
- Microbial Community Ecology and Physiology
- Coastal and Marine Dynamics
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2019-2023
Numerous studies have provided compelling evidence that the Pacific Ocean has experienced substantial glacial/interglacial changes in bottom-water oxygenation associated with enhanced carbon dioxide storage glacial deep ocean. Under postulated low oxygen concentrations (O2bw), redox zonation, biogeochemical processes and element fluxes sediments must been distinctively different during last period (LGP) compared to current well-oxygenated conditions. In this study, we investigated six sites...
Dissimilatory iron reduction (DIR) is suggested to be one of the earliest forms microbial respiration. It plays an important role in biogeochemical cycling modern and ancient sediments. Since typically accompanied by isotope fractionation, stable isotopes are used as tracer for biological activity. Here we present data dissolved sequentially extracted sedimentary pools from deep hot subseafloor sediments retrieved Nankai Trough off Japan. Dissolved (Fe(II)aq) isotopically light throughout...
Abstract Molybdenum (Mo) is a trace element sensitive to oceanic redox conditions. The fidelity of sedimentary Mo as paleoredox proxy coeval seawater depends on the extent remobilization during postdepositional processes. Here we present content and isotope profiles for deep sediments from Nankai Trough, Japan. signature suggests that these have experienced extensive early diagenesis hydrothermal alteration at depth. Iron (Fe)‐manganese (Mn) (oxyhydr)oxide combined with thiolation leads more...
Abstract Biogeochemical processes in subseafloor sediments are closely coupled to global element cycles. To improve the understanding of changes biogeochemical conditions on geological timescales, we investigate sediment cores from a 1,180 m deep hole Nankai Trough offshore Japan (Site C0023) drilled during International Ocean Discovery Program Expedition 370. During its tectonic migration Shikoku Basin over past 15 Ma, Site C0023 has experienced significant depositional, thermal, and...
Abstract Diagenesis can have a major impact on sedimentary mineralogy. Primary magnetic mineral assemblages be modified significantly by dissolution or formation of new minerals during early late diagenesis. At International Ocean Discovery Program Site C0023, which was drilled in the protothrust zone Nankai Trough Expedition 370, offshore Shikoku Island, Japan, non‐steady state conditions produced complex sequence overprints. Detailed rock measurements, characterize terms abundance, grain...
The Earth’s climate is increasingly warming due to ongoing anthropogenic carbon dioxide (CO2) emissions. In order mitigate the human-made change and meet Paris Agreement goals of limiting below 2°C, active removal (CDR) from atmosphere great importance in addition massive CO2 emission reductions. A possible CDR method rock weathering associated dissolution silicate minerals ocean, which leads marine alkalinity enhancement and, thus, an enhanced flux into ocean. framework...
Volcanic ash significantly contributes to marine sediments, especially in regions with active onshore volcanoes. Alteration of volcanic releases bicarbonate and cations, which drive precipitation authigenic carbonate clay minerals. Furthermore, ashes are commonly enriched reactive iron (Fe[III]), suggesting that alteration as a source reactants plays an important role (bio-)geochemical processes sediments. Volcanic layers ubiquitous sediments Site C0023, was established down 1180 m below...
Microbially mediated iron (Fe) reduction is suggested to be one of the earliest metabolic pathways on Earth and Fe(III)-reducing microorganisms might key inhabitants deep hot biosphere [1, 2]. Since microbial Fe cycling typically accompanied by isotope fractionation, stable isotopes (δ56Fe) are used as tracer for processes in modern ancient marine sediments [3, 4]. Here we present data dissolved sequentially extracted sedimentary pools from subseafloor that were recovered during...