A5075920228- Astro and Planetary Science
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Mineralogy and Gemology Studies
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Spacecraft and Cryogenic Technologies
- Stellar, planetary, and galactic studies
- Geological and Tectonic Studies in Latin America
- Cryospheric studies and observations
- Geomagnetism and Paleomagnetism Studies
- Radioactive contamination and transfer
- Nuclear Physics and Applications
- Paleontology and Stratigraphy of Fossils
- Ion-surface interactions and analysis
- Marine Biology and Ecology Research
- Astrophysics and Star Formation Studies
- Marine and fisheries research
- Landslides and related hazards
- Asian Studies and History
- Metallurgy and Cultural Artifacts
- Climate change and permafrost
Curtin University
2023-2025
Heidelberg University
2021-2025
Planetary Science Institute
2019-2022
University of California, Los Angeles
2019-2022
University of Wisconsin–Madison
2016-2021
Ruhr University Bochum
2012-2021
To assess the impact of ongoing, historically unprecedented Arctic ice melting, precisely synchronized chronologies are indispensable for past analogs abrupt climate change. Around 12,900 years before present (B.P.), Atlantic-European realm experienced an relapse to near-glacial conditions attributed meltwater fluxes, Younger Dryas. However, it remained unclear how fast this climatic change propagated southward into Europe as terrestrial and ice-core not sufficiently synchronized. Here, we...
The 26Al-26Mg ages of FeO-rich (type II) chondrules from Acfer 094, one the least thermally metamorphosed carbonaceous chondrites, were determined by SIMS analysis plagioclase and olivine/pyroxene using a radio frequency (RF) plasma oxygen ion source. In combination with preexisting FeO-poor I) chondrules, maximum range formation recorded in single meteorite is to help provide constraints on models material transport proto-planetary disk. We also report new three-isotope analyses type II...
Short-lived radionuclides (SLRs) once present in the solar nebula can be used as probes of formation environment our Solar System within Milky Way Galaxy. The first-formed solids System, calcium-, aluminum-rich inclusions (CAIs) meteorites, record one-time existence SLRs such 10Be and 26Al nebula. We measured 10Be–10B isotope systematics 29 CAIs from several CV3, CO3, CR2, CH/CB chondrites show that all except for a FUN CAI homogeneous initial 10Be/9Be with single probability density peak at...
Dust condensation and coagulation in the early solar system are first steps toward forming terrestrial planets, but time scales of these processes remain poorly constrained. Through isotopic analysis small Ca-Al-rich inclusions (CAIs) (30 to 100 μm size) found one most pristine chondrites, Allan Hills A77307 (CO3.0), for short-lived 26Al-26Mg [t1/2 = 0.72 million years (Ma)] system, we have identified two main populations samples characterized by well-defined 26Al/27Al 5.40 (±0.13) × 10-5...
Abstract We performed in situ oxygen three‐isotope measurements of chondrule olivine, pyroxenes, and plagioclase from the newly described CV R ed chondrite NWA 8613. Additionally, isotope ratios chondrules Kaba 3 OxB were determined to enable comparisons degree alteration both lithologies. 8613 was affected by only mild thermal metamorphism. The majority olivine pyroxenes plot along a slope‐1 line diagram, except for type II remolten barred chondrule. When isotopic relict is excluded, low‐...
Dense and strong, hydrothermal-metasomatic jadeitite jadeite-omphacite rocks were used as tools adornments throughout the wider Caribbean since initial inhabitation. Regionally, rich sources of jade are known only in Guatemala (north south Motagua Fault Zone), eastern Cuba northern Dominican Republic, establishing that humans transported jadeitic material over vast distances. This study validates geochemical fingerprinting is a viable provenance method for pre-colonial lithologies. An...
The time at which the Neotethys Ocean started to subduct along southern margin of Eurasia within Iran has been debated in recent years. This margin, referred as Sanandaj-Sirjan Zone (SaSZ), features a series Jurassic calc-alkaline igneous formations were emplaced c. 170 Ma. However, an alternative model suggests that subduction initiation occurred during Cretaceous period. To address this age controversy, we utilized Lu-Hf isochron method and employed SIMS U-Pb zircon rutile geochronology...
Abstract Many archaeological sites with jadeitite artefacts are known in the Caribbean region, but defining source of raw material is a major problem because great mineralogical heterogeneity both potential sources and artefacts. The settlement site Playa Grande on northern coast Dominican Republic particularly significant it yielded evidence on-site axe manufacture, lies only 20–30 km NE recently discovered area serpentinite mélanges nearby Río San Juan Complex (RSJC). A suite nine was...
A synthetic laser ruby crystal (HD-LR1) is introduced as a new matrix-matched reference material for secondary ionization mass spectrometry (SIMS) analysis of oxygen isotopes in corundum.
Abstract In modern environments, pore water geochemistry and modelling simulations allow the study of methane (CH 4 ) sources sinks at any geographic location. However, reconstructing CH dynamics in geological records is challenging. Here, we show that benthic foraminiferal δ 34 S can be used to reconstruct flux (i.e., diffusive vs. advective) timing emissions fossil records. We measured Cassidulina neoteretis specimens from selected samples collected Vestnesa Ridge, a cold seep site Arctic...
The Laacher See eruption (LSE) deposited a key tephra layer that synchronizes Late Glacial paleoclimate records across Europe, and thus provides the temporal framework to investigate onset of Younger Dryas cooling in North Atlantic region. absolute timing climatic consequences this event remain, however, still debated. Here, we present evidence from high-resolution speleothem record Herbstlabyrinth Cave, Central Germany, demonstrating distinct spikes sulfur, fluorescent organic matter,...
The Snake River Plain plateau and the adjacent Columbia Yellowstone volcanic fields form one of world largest flood basalt provinces. Eruptive centers migrated eastward since late Cenozoic following hotspot, erupting an archetypical bimodal suite with compositions ranging from olivine-tholeiite to rhyolite. Up 80% ~1600 km2 eastern portion (ESRP) is covered by mafic lava flows, which four prominent Pleistocene rhyolite domes emerge. Closely associated ESPR Craters Moon (COM) field,...