A5087601688- Astro and Planetary Science
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- earthquake and tectonic studies
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Geological formations and processes
- Stellar, planetary, and galactic studies
- Space Exploration and Technology
- Archaeology and ancient environmental studies
- Methane Hydrates and Related Phenomena
- Geochemistry and Geologic Mapping
- Radioactive contamination and transfer
- Geochemistry and Elemental Analysis
- Pleistocene-Era Hominins and Archaeology
- Geomagnetism and Paleomagnetism Studies
- Radioactivity and Radon Measurements
- Paleontology and Stratigraphy of Fossils
- Landslides and related hazards
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Atmospheric and Environmental Gas Dynamics
- Geological Formations and Processes Exploration
ETH Zurich
2016-2025
École Polytechnique Fédérale de Lausanne
2009-2013
Scottish Enterprise
2005-2010
Scottish Universities Environmental Research Centre
2005-2010
University of Ulster
2009
Centro Nacional de Aceleradores
2008
University of Arizona
2007
We obtained Hf–W metal-silicate isochrons for several H chondrites of petrologic types 4, 5, and 6 to constrain the accretion high-temperature thermal history chondrite parent body. The silicate fractions have 180Hf/184W ratios up ∼ 51 182W/184W 33 ε units higher than whole-rock. These high radiogenic W isotope result in highly precise ages. ages become younger with increasing metamorphic grade range from ΔtCAI = 1.7 ± 0.7 Ma H4 Ste. Marguerite 9.6 1.0 H6 Kernouvé Estacado. Closure...
The geometry and evolution of fluvial systems are thought to be related surface uplift. In eastern Tibet, rivers exhibit peculiar drainage patterns but how these were established their connection with the plateau uplift still under debate. Here, we use detrital zircon U-Pb dating, bedrock (U-Th)/He thermochronometry, topographic analysis numerical modeling explore paleo-drainage pattern Dadu Anning Rivers, Tibet. Our data indicate that Pliocene sources sediments River different from modern...
We determined interstellar cosmic ray exposure ages of 40 large presolar silicon carbide grains extracted from the Murchison CM2 meteorite. Our ages, based on cosmogenic Ne-21, range 3.9 ± 1.6 Ma to ∼3 2 Ga before start Solar System ∼4.6 ago. A majority have lifetimes <300 Ma, which is shorter than theoretical estimates for grains. These condensed in outflows asymptotic giant branch stars <4.9 ago that possibly formed during an episode enhanced star formation ∼7 minority >1 Ga. Longer are...
The near-Earth carbonaceous asteroid (162173) Ryugu is expected to contain volatile chemical species that could provide information on the origin of Earth's volatiles. Samples were retrieved by Hayabusa2 spacecraft. We measured noble gas and nitrogen isotopes in samples found they are dominated presolar primordial components, incorporated during Solar System formation. Noble concentrations higher than those Ivuna-type (CI) chondrite meteorites. Several host phases isotopically distinct have...
Abstract. The Tsangpo-Brahmaputra River drains the eastern part of Himalayan range and flows from Tibetan Plateau through syntaxis downstream to Indo-Gangetic floodplain Bay Bengal. As such, it is a unique natural laboratory study how denudation sediment production processes are transferred river detrital signals. In this study, we present new 10Be data set constrain rates across catchment quantify impact rapid erosion within region on cosmogenic nuclide budgets measured span around 2 orders...
Abstract We present noble gas data for 16 shergottites, 2 nakhlites ( NWA 5790, 10153), and 1 angrite 7812). Noble exposure ages of the shergottites fall in 1–6 Ma range found previous studies. Three depleted olivine‐phyric (Tissint, 6162, 7635) have ~1 Ma, agreement with published similar specimens. The age 10153 (~12.2 Ma) falls 9–13 reported other nakhlites. Our preferred ~7.3 5790 is lower than this range, it possible that represents a distinct ejection event. A Tissint glass sample...
Abstract The Moroccan High Atlas, the Anti‐Atlas belts, and Siroua volcanic massif form an orographic system locally risen to elevations over 4 km. Topographic growth of this occurred by Cenozoic transpressive inversion Mesozoic rift structures concomitant with activity related mantle processes. In order constrain topographic growth, we analyze regional‐scale exhumation pattern, compare it physiographic features. We contribute 35 new mean (U‐Th‐Sm)/He 24 fission track ages on apatite from...
Like most primitive carbonaceous chondrites, the CM chondrites experienced varying degrees of asteroidal aqueous alteration, which may have overprinted pre-accretionary processing. Several alteration scales for (and other chondrites) been proposed based on alteration-dependent changes in various petrological and geochemical characteristics. Given possibility that intensity could be recorded primordial noble gas compositions, we test potential correlations between petrologic, characteristics...
Carbonate deformation through the brittle-ductile transition (BDT) remains incompletely documented in field. We therefore investigate exhumation of SW-Helvetic nappe stack using a new multi-method approach that integrates optical observations with revised nomenclature, thermochronology, stable isotopes, and clumped isotope thermometry, aiming to constrain time-temperature history BDT processes carbonates. Single grain (U–Th)/He zircon apatite fission track ages establish burial/exhumation...
Abstract In 1889 the German poet and novelist Theodor Fontane wrote popular literary ballad “Herr von Ribbeck auf im Havelland.” The Squire is described as a gentle generous person, who often gives away pears from his pear trees to children passing by continued donating after death. Now, 135 years later rock called giving us insight into processes that happened 4.5 billion ago. meteorite (official find location: 52°37′15″N, 12°45′40″E) fell January 21, 2024, has been classified brecciated...
Abstract A combination of ‘bomb spike’ calibration and conventional AMS 14 C dating has been used to determine a detailed age-depth model for 1-m sediment section collected from salt marsh in Poole Harbour, southern England. These data were compared with the chronology obtained 210 Pb analysis 137 Cs age markers. We report post bomb values over 1.46 F (> 146% modern C), both rising falling limbs atmospheric are identified. Five pre-bomb samples analysed using multi-target high-precision...
The Sari\c{c}i\c{c}ek howardite meteorite shower consisting of 343 documented stones occurred on 2 September 2015 in Turkey and is the first fall. Cosmogenic isotopes show that experienced a complex cosmic ray exposure history, exposed during ~12-14 Ma regolith near surface parent asteroid, an ca.1 m sized meteoroid was launched by impact 22 +/- ago to Earth (as did one third all HED meteorites). SIMS dating zircon baddeleyite yielded 4550.4 2.5 4553 8.8 crystallization ages for basaltic...
The Namche Barwa syntaxis in the eastern Himalaya is rapidly evolving terms of its tectonics and topography. Here we constrain exhumation history Yigong River to immediate north across different time scales using a multidisciplinary approach. Our new thermochronometric data reveal an acceleration rates since 2 Ma downstream Yigong. Cosmogenic nuclides thermoluminescence thermochronometry analyses confirm persistent rapid lower over Quaternary with further increased last 100 ka. Together...
The Hayabusa2 spacecraft returned to Earth from the asteroid 162173 Ryugu on 6 December 2020. One day after recovery, gas species retained in sample container were extracted and measured on-site stored collection bottles. consists of helium neon with an extraterrestrial 3 He/ 4 He 20 Ne/ 22 Ne ratios, along some contaminant terrestrial atmospheric gases. A mixture solar Earth’s is best explanation for composition. Fragmentation grains within discussed basis estimated amount indigenous size...
Carbonaceous chondrites are considered to have originated from C-type asteroids and represent some of the most primitive material in our solar system. Furthermore, since carbonaceous can contain significant quantities volatile elements, they may played a crucial role supplying volatiles organic Earth other inner system bodies. However, major challenge unravelling composition chondritic meteorites is distinguishing between which features were inherited parent body, what be secondary feature...
Abstract Deckenschotter are glaciofluvial gravels that cap isolated bedrock plateaus and largely disconnected from today's local drainage. They were deposited when glaciers the Alps first extensive enough to reach northern Swiss foreland, thus providing a unique record of foreland landscape its evolution during earliest Quaternary glaciations. To decipher this record, we employ two robust methodologies: cosmogenic 26 Al/ 10 Be burial dating GIS‐based topographic analysis. ages both new...
Accretionary orogens grow through frontal accretion and crustal underplating, that contribute to thickening by scraping slices of continental crust from the downgoing plate. Although geophysical data provide insights into deep structure these orogens, understanding modes in retreating subduction systems surface responses processes, remains challenging.This study focuses on Albanides-Hellenides, a long-lived orogen Mediterranean resulted eastward Adria plate beneath Eurasia since Late...