A5032833607- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Paleontology and Stratigraphy of Fossils
- Isotope Analysis in Ecology
- Atmospheric and Environmental Gas Dynamics
- Evolution and Paleontology Studies
- Geological and Geochemical Analysis
- Geological formations and processes
- Marine Bivalve and Aquaculture Studies
- Groundwater and Isotope Geochemistry
- earthquake and tectonic studies
- Pleistocene-Era Hominins and Archaeology
- Geological Studies and Exploration
- CO2 Sequestration and Geologic Interactions
- Geological and Geophysical Studies
- Marine Biology and Ecology Research
- Geochemistry and Geologic Mapping
- Ocean Acidification Effects and Responses
- Marine and coastal ecosystems
- Geochemistry and Elemental Analysis
- Spacecraft and Cryogenic Technologies
- Calcium Carbonate Crystallization and Inhibition
- Coral and Marine Ecosystems Studies
- High-pressure geophysics and materials
Goethe University Frankfurt
2015-2024
University of Bologna
2023
Senckenberg Biodiversity and Climate Research Centre
2013-2021
Johannes Gutenberg University Mainz
2021
University of Lausanne
2003-2005
Goethe Institute
2004
University of Göttingen
1999-2002
This paper reports the results from a second characterisation of 91500 zircon, including data electron probe microanalysis, laser ablation inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS), secondary ion mass (SIMS) and fluorination analyses. The focus this initiative was to establish suitability large single zircon crystal for calibrating in situ analyses rare earth elements oxygen isotopes, as well provide working values key geochemical systems. In addition extensive testing...
Abstract Increased use and improved methodology of carbonate clumped isotope thermometry has greatly enhanced our ability to interrogate a suite Earth‐system processes. However, interlaboratory discrepancies in quantifying (Δ 47 ) measurements persist, their specific sources remain unclear. To address differences, we first provide consensus values from the community for four standards relative heated equilibrated gases with 1,819 individual analyses 10 laboratories. Then analyzed along three...
Abstract The clumped isotopic composition of carbonate‐derived CO 2 (denoted Δ 47 ) is a function carbonate formation temperature and in natural samples can act as recorder paleoclimate, burial, or diagenetic conditions. absolute abundance heavy isotopes the universal standards VPDB VSMOW (defined by four parameters: R 13 , 17 18 λ impact calculated values. Here, we investigate whether use updated more accurate values for these parameters remove observed interlaboratory differences measured...
Shells of the extremely long-lived bivalve mollusk Arctica islandica (Linnaeus 1767) provide century-long, multi-proxy records inter-annual environmental variability in middle- to high-latitude marine settings. Reliable interpretation these climate archives, however, requires exact knowledge length and timing growing season which parameters control shell growth rate during year. Here, intra-annual microstructures, δ18O-derived ambient water temperatures, δ13C from A. shells collected...
Serpentinites are important components of the oceanic lithosphere and viewed as major water sources in subduction zones. Study a set ultramafic rocks equilibrated at increasing depths (oceanic high-pressure antigorite serpentinites, olivine-orthopyroxene rocks), shows that these can act carriers Cl, B, Sr, Rb, Cs, alkalis. Serpentinization mantle produces enrichment The path within stability field serpentine is accompanied recycling alkalis into variably saline fluids (4-8 wt% NaClequiv...
The measurement of the abundances minor isotopologues by mass spectrometry requires correction subtle non-linearities in spectrometer that cause deviations relationship between actual and measured isotope ratios. Here we show negative backgrounds on Faraday cups recording ion beams are observed CO(2) isotopologues, propose a new procedure for clumped measurements.We carefully investigated non-linearity effects abundance (13)C(18)O(16)O, isotopologue with m/z 47, two different spectrometers....
Surface temperature is a fundamental parameter of Earth's climate. Its evolution through time commonly reconstructed using the oxygen isotope and clumped compositions carbonate archives. However, reaction kinetics involved in precipitation carbonates can introduce inaccuracies derived temperatures. Here, we show that dual analyses, i.e., simultaneous ∆47 ∆48 measurements on single phase, identify origin quantify extent these kinetic biases. Our results verify theoretical predictions evidence...
Abstract Sedimentary rocks recording the Toarcian oceanic anoxic event (T‐OAE) are marked by a negative carbon isotope excursion (CIE) reaching up to −7‰ and ranking among largest known in Phanerozoic. These records suggest dramatic perturbation of cycle that has been linked transfer juvenile from endogenic exogenic reservoirs. Nevertheless, magnitude CIE varies significantly one substrate another, hence complicating mass balance evaluation potential driving mechanisms. Here we show, using...
Abstract Reconstructing long-term continental temperature change provides the required counterpart to age equivalent marine records and can reveal how terrestrial temperatures were related during times of extreme climate such as Miocene Climatic Optimum (MCO) following Middle Transition (MMCT). Carbonate clumped isotope (T(Δ 47 )) from 17.5 14.0 Ma Central European paleosols (Molasse Basin, Switzerland) display a pattern MCO that is similar coeval records. Maximum in soil T(Δ ) record (at...
Accumulation of molecular hydrogen in geologic systems can create conditions energetically favorable to transform inorganic carbon into methane and other organic compounds. Although hydrocarbons with a potentially abiotic origin have been proposed form number crustal settings, the ubiquitous presence compounds derived from biological matter presents challenge for unambiguously identifying molecules. In recent years, extensive analysis organics diverse fluids, combined novel isotope analyses...
High-precision analysis of the excess abundance (relative to stochastic distribution) mass 48 isotopologues in CO2 evolved from acid digestion carbonates (∆48) has not been possible until recently due relatively low natural 18O. Here we show that 253 Plus™ gas source spectrometer equipped with Faraday cups and 1013 Ω resistors can perform combined ∆47 ∆48 analyses on external reproducibilities (1SD) 0.010 ‰ 0.030 ‰, respectively. ~10 mg aliquots five carbonate reference materials (ETH 1, ETH...
The Triassic‐Jurassic boundary mass‐extinction event (T‐J; 199.6 Ma) is associated with major perturbations in the carbon cycle recorded stable isotopes. Two rapid negative isotope excursions bulk organic ( δ 13 C org ) occur within immediate interval at multiple locations and have been linked to outgassing of 12 C‐enriched CO 2 from Central Atlantic Magmatic Province. In British Columbia, a positive excursion +5‰ (Vienna Peedee belemnite (V‐PDB)) spans part or all subsequent Hettangian...
The kinetic nature of the phosphoric acid digestion reaction enables clumped isotope analysis carbonates using gas source ratio mass spectrometry (IRMS). In most laboratories digestions are performed at 25°C in sealed vessels or 90°C a common bath. Here we show that different Δ47 results obtained depending on technique employed.Several replicates biogenic aragonite and NBS 19 were reacted with 104% H3 PO4 sample size varied between 4 mg 14 mg. Purification methods standard for analyses...