A5045314411- Geological and Geochemical Analysis
- Geochemistry and Elemental Analysis
- Radioactive element chemistry and processing
- Geology and Paleoclimatology Research
- Groundwater and Isotope Geochemistry
- Paleontology and Stratigraphy of Fossils
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- earthquake and tectonic studies
- Clay minerals and soil interactions
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Isotope Analysis in Ecology
- Nuclear Physics and Applications
- Geochemistry and Geologic Mapping
- Crystal Structures and Properties
- Chemical Synthesis and Characterization
- Geological and Geophysical Studies
- Marine and environmental studies
- Archaeology and ancient environmental studies
- Seismology and Earthquake Studies
- Analytical chemistry methods development
- Geological formations and processes
- Pleistocene-Era Hominins and Archaeology
- Glass properties and applications
University of Bremen
2011-2024
Leibniz Centre for Tropical Marine Research
2021
GFZ Helmholtz Centre for Geosciences
2006-2015
Technische Universität Braunschweig
1963
We present new analytical data of major and trace elements for the geological MPI‐DING glasses KL2‐G, ML3B‐G, StHs6/80‐G, GOR128‐G, GOR132‐G, BM90/21‐G, T1‐G, ATHO‐G. Different methods were used to obtain a large spectrum element data, in particular, EPMA, SIMS, LA‐ICPMS, isotope dilution by TIMS ICPMS. Altogether, more than 60 qualified geochemical laboratories worldwide contributed analyses, allowing us reference information values their uncertainties (at 95% confidence level) up 74...
Ocean acidification and mass extinction The largest in Earth's history occurred at the Permian-Triassic boundary 252 million years ago. Several ideas have been proposed for what devastated marine life, but scant direct evidence exists. Clarkson et al. measured boron isotopes across this period as a highly sensitive proxy seawater pH. It appears that, although oceans buffered acidifiying effects of carbon release from contemporary pulses volcanism, buffering failed when volcanism increased...
The La Paz aquifer system (Baja California Sur, Mexico) is under severe anthropogenic pressure because of high groundwater abstraction for urban supply (city Paz, around 222,000 inhabitants) and irrigated agriculture (1900 ha). In consequence, seawater has infiltrated the aquifer, forcing abandonment wells with increased salinity. objective this study was to assess intrusion, understand hydrogeochemical processes involved estimate contribution in tested. comprises mainly alluvial filling...
We present data on the concentration, isotope composition and homogeneity of boron in NIST silicate glass reference materials SRM 610 612, powders glasses geological JB‐2 (basalt) JR‐2 (rhyolite). Our are intended to serve as references for both microanalytical wet‐chemical techniques. The δ 11 B compositions determined by N‐TIMS P‐TIMS agree within 0.5% compare with SIMS 2.5%. profiles demonstrate better than = 2% glasses, however a slight depletion was detected towards outermost 200 μm rim...
The Istituto di Geoscienze e Georisorse (IGG), on behalf and with the support of International Atomic Energy Agency (IAEA), prepared eight geological materials (three natural waters five rocks minerals), intended for a blind interlaboratory comparison measurements boron isotopic composition concentration. were distributed to twenty seven laboratories ‐ virtually all those performing geochemical isotope analyses in world ‐which agreed participate intercomparison exercise. Only fifteen...
Abstract To evaluate the interlaboratory mass bias for high‐precision stable Mg isotopic analysis of natural materials, a suite silicate standards ranging in composition from felsic to ultramafic were analyzed five laboratories by using three types multicollector inductively coupled plasma spectrometer (MC‐ICPMS). Magnesium compositions all labs are agreement most rocks within quoted uncertainties but significantly (up 0.3‰ 26 Mg/ 24 Mg, >4 times uncertainties) different some mafic...
Abstract Chlorine, lithium, and boron are trace elements in rhyolite but enriched groundwater flowing through because they tend to partition into the fluid phase during high‐temperature fluid‐rock reactions. We present a large data set of major element δ 37 Cl, 7 Li, 11 B compositions thermal water from Yellowstone Plateau Volcanic Field (YPVF). The Cl/B, Cl/Li, Cl (−0.2‰ +0.7‰), (−6.2‰ −5.9‰) values alkaline‐chloride waters reflect leaching chlorine, that has +0.1‰ +0.9‰ −6.3‰ −6.2‰,...
Abstract Salars with lithium-rich brines are a characteristic feature of the Central Andes, but knowledge about main sources lithium and mobilization processes in salar deposits is still incomplete. This work focuses especially on Salar de Diablillos (southern Puna) as part larger area that includes neighboring Centenario Ratones. Building ability Li tracer silicate weathering, we investigate content isotope composition samples from depocenter catchment basin (3-D) conduct surface...
Abstract The Central Andes of South America host the largest known lithium resources in a confined area, but primary sources salar deposits and mobilisation process are still matter speculation. Chemical weathering at or near surface leaching hydrothermal systems active magmatic arc considered two main mechanisms Li extraction from source rock. strontium isotope composition typical offer insights into processes on how brine Andean evaporites formed. Data Salar de Pozuelos indicate...
Abstract. The low δ56Fe values of dissolved iron liberated by microbial reduction are characteristic many shallow subsurface sediments and – if not significantly changed within the oxic sediment layer related benthic Fe fluxes into water column. Here, we decipher whether stable isotope signatures in pore respective solid-phase samples also useful for unraveling processes driving liberation deeper methanic sediments. We investigated fine-grained deposits Helgoland mud area, North Sea, where...