A5090557563- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Groundwater and Isotope Geochemistry
- Geological and Geochemical Analysis
- Marine Bivalve and Aquaculture Studies
- Astro and Planetary Science
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Marine Biology and Ecology Research
- Geochemistry and Geologic Mapping
- Radioactive element chemistry and processing
- Marine and environmental studies
- Atmospheric and Environmental Gas Dynamics
- Geological and Geophysical Studies
- Greenhouse Technology and Climate Control
- Geochemistry and Elemental Analysis
- Marine and coastal ecosystems
- Mine drainage and remediation techniques
- CO2 Sequestration and Geologic Interactions
- Pleistocene-Era Hominins and Archaeology
- Geological Formations and Processes Exploration
- Geological formations and processes
- Drilling and Well Engineering
Vrije Universiteit Brussel
2025
University of Geneva
2022-2024
Utrecht University
2019-2024
Royal Netherlands Institute for Sea Research
2022
ETH Zurich
2013-2021
Max Planck Institute for Marine Microbiology
2013-2014
University of Bremen
2013
Max Planck Society
2011
About a decade after its introduction, the field of carbonate clumped isotope thermometry is rapidly expanding because large number possible applications and potential to solve long-standing questions in Earth Sciences. Major factors limiting application this method are very high analytical precision required for meaningful interpretations, relatively complex sample preparation procedures, mass spectrometric corrections needed. In paper we first briefly review evolution standardization...
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...
Rationale Clumped isotope analyses ( Δ 47 ) of carbonates by dual inlet (DI) mass spectrometry require long integration times to reach the necessary high precision due low abundance rare isotopologue 13 C 18 O 16 O. Traditional DI protocols this only with large amounts sample and/or a number replicates as portion analyte gas is wasted. We tested an improved analytical workflow that significantly reduces sizes and total analysis time per while preserving accuracy. Methods implemented LIDI...
Abstract Carbonate clumped isotopes offer a potentially transformational tool to interpret Earth's history, but the proxy is still limited by poor interlaboratory reproducibility. Here, we focus on uncertainties that result from analysis of only few replicate measurements understand extent which unconstrained errors affect calibration relationships and paleoclimate reconstructions. We find highly precise data can be routinely obtained with multiple analyses, this not always done in many...
Clumped isotope thermometry can independently constrain the formation temperatures of carbonates, but a lack precisely temperature-controlled calibration samples limits its application on aragonites. To address this issue, we present clumped compositions aragonitic bivalve shells grown under highly controlled (1-18°C), which combine with data from natural and synthetic aragonites wide range (1-850°C). We observe no discernible offset in values between foraminifera, mollusks, abiogenic or...
Abstract The occurrence of the quartz‐carbonate alteration assemblage (listvenite) in ophiolites indicates that ultramafic rock represents an effective sink for dissolved CO 2 . However, majority earlier studies carbonation had to rely on surface exposure reaction textures and field relationships. Here we present first observations obtained from 300 m deep BT1B drill hole, ICDP Oman Drilling Project, allowing a continuous high‐resolution investigation. Hole recovered core intersecting...
Abstract Clumped isotopes provide a theory‐based proxy to reconstruct formation temperatures of carbonates. With the introduction empirical transfer function (ETF) and several carbonate standards, interlaboratory comparison has become achievable. Due rare occurrence multiply substituted isotopologues, analytical precision these measurements is very low. In order improve precision, we investigate optimal strategy for conversion into absolute reference frame using simulation approach. We find...
Abstract A few key methodological uncertainties remain for the carbonate clumped isotope community. One is how to compare data among published sets that are not anchored InterCarb Carbon Dioxide Equilibrium Scale (I‐CDES). second temperature calibrations of calcite those other minerals in I‐CDES—particularly dolomite and apatite—which can elucidate several Earth system dynamics. Previous thermometer discrepant from one another variably (dis)agree with developed calcite; apatite have yet been...
The variability of seawater temperature through time is a critical measure climate change, yet its reconstruction remains problematic in many regions. Mg/Ca and oxygen isotope (δ 18OC) measurements foraminiferal carbonate shells can be combined to reconstruct δ 18O 18OSW). latter changes local hydrology (e.g., precipitation/evaporation, freshwater inputs) global ice volume. But diagenetic processes may affect Mg/Ca. This restricts potential places, including the Mediterranean Sea, strategic...
The reliable determination of past seawater temperature is fundamental to paleoclimate studies. We test the robustness two paleotemperature proxies by combining Mg/Ca and clumped isotopes (Δ47) on same specimens core top planktonic foraminifera. strength this approach that Δ47 are measured foraminifera, thereby providing independent estimates temperature. This replication constitutes a rigorous individual methods with advantage can be applied fossil specimens. Aliquots for analyses treated...
Abstract Seasonal variability in sea surface temperatures plays a fundamental role climate dynamics and species distribution. bias can also severely compromise the accuracy of mean annual temperature reconstructions. It is therefore essential to better understand seasonal climates past. Many reconstructions deep time neglect this issue rely on controversial assumptions, such as estimates water oxygen isotope composition. Here we present absolute based clumped measurements bivalve shells...
Quantitative reconstructions of hydrological change during ancient greenhouse warming events provide valuable insight into warmer-than-modern cycles but are limited by paleoclimate proxy uncertainties. We present sea surface temperature (SST) records and seawater oxygen isotope (δ
Abstract. The Maastrichtian (~72–66 Ma), the final stage of Cretaceous, experienced long-term cooling with high atmospheric CO₂ and weak latitudinal temperature gradients. Tectonic movements variations in climate lead to sea-level changes dynamic ocean conditions. This background probably affected seawater circulation regime shallow epeiric Chalk Sea that covered a large portion Northern European continent. connections evolving Atlantic, Arctic Basin tropical Thetis Ocean South their impact...
A long-term cooling trend from middle Lutetian onwards (~44 Ma) was briefly interrupted by a short-lived warming event in the early Bartonian (~41 Ma), known as Middle Eocene Climatic Optimum (MECO). At this stage, Himalayan orogenesis ongoing, and mountain had not yet attained its current elevation, which now plays crucial role shaping Asia's seasonality monsoon patterns. The Indian Subcontinent reached tropical latitudes during long voyage southern to northern hemisphere, after disjunction...
     The late Ediacaran Nama Group of southern Namibia and northwestern South Africa hosts a mixed carbonate-siliciclastic Proterozoic succession is key for resolving the timing early metazoan evolution, leading to suite geochronology studies these rocks. Important outcrops upper are found in Swartpunt area, where depositional sequence preserved as series thrust plates that formed during compression associated with Gariep orogeny. Here, numerous silicified...
Dissimilatory sulphate reduction (DSR) leads to an overprint of the oxygen isotope composition by water. This is assumed occur via cell-internally formed sulphuroxy intermediates in pathway. Unlike sulphate, can readily exchange isotopes with Subsequent exchange, these intermediates, e.g. sulphite, are re-oxidised reversible enzymatic reactions thereby incorporating used for re-oxidation sulphur intermediates. Consequently, rate and expression DSR-mediated between water depend not only on...
One of the most intriguing recent discoveries in biogeochemistry is ubiquity cryptic sulfur cycling. From subglacial lakes to marine oxygen minimum zones, and sediments, cycling – simultaneous sulfate consumption production has been observed. Though this process does not leave an imprint budget ambient environment thus term it may have a massive impact on other element cycles fundamentally change our understanding biogeochemical processes subsurface. Classically, sulfate-methane transition...
The Atlantis Bank is a representative example of an oceanic core complex formed on slow-spreading ridge. It dominated by olivine gabbros emplaced at ∼12 Ma and exhumed from original depths more than ∼2500 metres below seafloor (mbsf). In order to investigate the timing exhumation low-temperature alteration we investigated twenty-two calcite veins in samples recovered 809-mbsf Hole U1473A drilled during Expedition 360 International Ocean Discovery Program. yielded laser ablation U-Pb bulk...