A5035318443- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Geochemistry and Geologic Mapping
- Particle Accelerators and Free-Electron Lasers
- Mineralogy and Gemology Studies
- Landslides and related hazards
- Glass properties and applications
- Paleontology and Stratigraphy of Fossils
- Geochemistry and Elemental Analysis
- TiO2 Photocatalysis and Solar Cells
- Cryospheric studies and observations
- Advanced Photocatalysis Techniques
- Geological and Geophysical Studies
- Geological and Geophysical Studies Worldwide
- CO2 Sequestration and Geologic Interactions
- Clay minerals and soil interactions
- Chemical Synthesis and Characterization
- Photorefractive and Nonlinear Optics
- Water Quality Monitoring and Analysis
- Geological formations and processes
- Rangeland Management and Livestock Ecology
University of Lausanne
2008-2025
University of Bern
2011-2020
The University of Texas at Austin
2008-2009
University of Vienna
2009
Abstract On the basis of phylogenetic studies and laboratory cultures, it has been proposed that ability microbes to metabolize iron emerged prior Archaea/Bacteria split. However, no unambiguous geochemical data supporting this claim have put forward in rocks older than 2.7–2.5 giga years (Gyr). In present work, we report situ Fe S isotope composition pyrite from 3.28‐ 3.26‐Gyr‐old cherts upper Mendon Formation, South Africa. We identified three populations microscopic pyrites showing a wide...
Abstract The textural and chemical evolution of allanite monazite along a well‐constrained prograde metamorphic suite in the High Himalayan Crystalline Zanskar was investigated to determine P–T conditions for crystallization these two REE accessory phases. results this study reveals that: (i) is stable phase biotite garnet zone (ii) disappears at staurolite‐in isograd, simultaneously with occurrence first monazite. Both occur as inclusions staurolite, indicating that breakdown formation...
Native metals of igneous origin are recognized as one the distinctive features basalts from Moon. Our study demonstrates that tiny Fe-Ni metal blebs nucleated lunar magma exhibit unanticipated, nutshell-like, crystallographic microstructures, can be used in conjunction with local variations chemical compositions to trace complete thermal history host rock. This encompasses rapid cooling on surface, shock reheating upon impact, and post-shock outer space. The indicate lava cooled two stages,...
Massive dehydration is expected to occur during oceanic subduction. The situation quite different continental subduction, where often a large amount of crustal material has experienced first orogenic cycle before the burial second subduction/collision (rocks are therefore polycyclic). and timing and/or hydration episodes in polycyclic rocks strongly controls extent metamorphic re-equilibration cycle. This study aims at estimating fluid budget metapelites from Muret Unit (Dora-Maira Massif,...
In situ iron isotope ratios (δ 56 Fe) in sulfide measured by secondary ion mass spectrometry (SIMS) can provide valuable information on several of Earth's surface processes. SIMS relies the use a matrix‐matched reference material to correct for instrumental fractionation. To date Balmat pyrite has been widely used as material, assumption its homogeneous δ Fe composition. However, studies have reported divergent bulk values, which may jeopardise use. Here, we combined solution MC‐ICP‐MS and...
Abstract Mushroom‐ and atoll‐shaped garnet crystals were found in high‐pressure quartz‐rich pelitic layers from the Monte Mucrone area (Western Alps, Italy). These are characterized by a peninsula‐shaped core surrounded partially crystallized, dodecahedral external rim. Textural observations thermodynamic modelling point towards growth of atoll during two distinct orogenic cycles. The region inner part ring forming edge grew under Barrovian metamorphic conditions likely Hercynian age, while...
In the central and southeastern parts of Himalayas, High Himalayan Crystalline (HHC) high‐grade rocks are mainly exhumed in frontal part range, as a consequence tectonic exhumation controlled by combined thrusting along Main Central Thrust (MCT) extension South Tibetan Detachment System (STDS). NW Himalaya, however, hanging wall MCT range consists low‐ to medium‐grade metasediments (Chamba zone), whereas most amphibolite facies migmatitic gneisses HHC Zanskar exposed more internal orogen...
Abstract The growth history of two populations snowball garnet from the Lukmanier Pass area (central Swiss Alps) was examined through a detailed analysis three‐dimensional geometry, chemical zoning and crystallographic orientation. first population, collected in hinge chevron‐type fold, shows an apparent rotation 360°. 270° are characterized by spiral‐shaped inclusion trails, gradual concentric Mn single orientation, whereas last 90°, crenulated trails secondary maxima centred on distinct...
Abstract Muscovite B4M, distributed in 1961 as an age standard, was ground under ethanol. Five grain size fractions were obtained and characterized by X-ray diffraction. They display a mixing trend between phengitic (enriched the fraction <0.2 µm) muscovitic component (predominant >20 µm). High-pressure phengite is preserved relict retrograde muscovite. Electron microprobe analyses of mineral separate reveal at least four white mica populations based on Si, Al, Mg, Na, Fe F. Rb/K...
Abstract For two decades, considerable efforts have been made to explain the formation of snowball garnets by either rotational or non‐rotational models. On basis morphological, chemical and crystallographic evidence, this paper presents new data on showing that these microstructures can be explained combination previously proposed mechanisms operating consecutively during garnet growth. The crystallization sequence revealed Mn contouring distribution orientations within spiral indicate...
Melt and gas transfer processes are essential to the formation growth of Earth's crust for sustaining volcanic activity. These also play a major role in magma fractionation at shallow depths (< 10 km) where magmas stall rheologically solidify. In this scenario, conditions melt mobilisation during progressive cooling crystal mushes down their solidus remain poorly understood. We present experimental data (at 1.1 kbar) showing how combination temperature content control ability escape from...