A5026897099- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Hydrocarbon exploration and reservoir analysis
- Mineral Processing and Grinding
- Geological and Geophysical Studies
- Geological formations and processes
- Electron and X-Ray Spectroscopy Techniques
- Earthquake Detection and Analysis
- Geology and Paleoclimatology Research
- Geological and Geophysical Studies Worldwide
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Mineralogy and Gemology Studies
- Geological Studies and Exploration
- Calcium Carbonate Crystallization and Inhibition
- Graphite, nuclear technology, radiation studies
- Landslides and related hazards
- Chemical Synthesis and Characterization
- CO2 Sequestration and Geologic Interactions
- Enhanced Oil Recovery Techniques
- Geoscience and Mining Technology
- Groundwater flow and contamination studies
- Nuclear materials and radiation effects
Centre National de la Recherche Scientifique
2017-2024
Université d'Orléans
2021-2024
Institut des Sciences de la Terre
2015-2024
Bureau de Recherches Géologiques et Minières
2021-2024
Institut des Sciences de la Terre d'Orléans
2020-2024
Institut des Sciences de la Terre de Paris
2018-2023
Sorbonne Université
2018-2023
Laboratoire d'Hydrodynamique
2020-2021
Université Savoie Mont Blanc
2017-2019
Université Grenoble Alpes
2017-2019
Abstract Compositional mapping has greatly impacted mineralogical and petrological studies over the past half-century with increasing use of electron probe micro-analyser. Many technical analytical developments have benefited from synergies physicists geologists they contributed to success this technique. Large-area compositional become routine practice in many laboratories worldwide, improving our ability measure variability minerals natural geological samples reducing operator bias as...
In natural shear zones, micro-porosity is found to decorate the grain boundaries of rocks which have been deformed in viscous conditions. Whether porosity formed during or after deformation widely debated, and requires further investigation test how micro-pores may be produced, particularly monomineralic aggregates.Using a new-generation Griggs-type apparatus, we performed two general experiments using fine grained (∼ 3 μm) quartzite (white novaculite) with low no primary...
Micro-scale porosity is a feature commonly found in viscously deformed quartz-rich mylonites. However, the processes which may form such are actively debated, and whether or not pores formed syn-kinematically to shear zone activity remains uncertain. Yet, production of micro-pores during rock deformation have several critical implications, as affecting strength, possibly through brittle-ductile transition, and/or providing fluid pathways active zones.In this study we focus on bands produced...
Experimental and field-based research has shown that the presence of mica minerals drastically reduces mechanical resistance rocks during both brittle viscous deformation, which allows localization deformation into narrow regions such as shear zones. Furthermore, experimental work proved phlogopite-quartz assemblages with a abundance 30% is weak sample composed entirely mica. This phenomenon occurs combination several processes, including developing interconnected networks domains grain size...
Exhuming shear zones are key structures in the dynamic evolution of orogens. Such accommodate most shear-related exhumation within relatively small rock-volumes. This is possible due to major strain partitioning occurring along weak rocks, frequently represented by phyllosilicate-rich rocks. Thus, study mylonites can provide fundamental insights into mechanisms responsible for architecture orogens.The Hulw Shear Zone Saih Hatat Window Oman (Agard et al., 2010) one these exhuming juxtaposing...
Abstract Linking ages to metamorphic stages in rocks that have experienced low‐ medium‐grade metamorphism can be particularly tricky due the rarity of index minerals and preservation mineral or compositional relicts. The timing Mesozoic exhumation metasedimentary units crystalline basement form internal part Longmen Shan (eastern Tibet, Sichuan, China), are, for these reasons, still largely unconstrained, but crucial understanding regional tectonic evolution eastern Tibet. In situ core‐rim...
Abstract The Longmen Shan belt (eastern border of the Tibetan plateau) constitutes a tectonically active region as demonstrated by occurrence unexpected 2008 M w 7.9 Wenchuan and 2013 6.6 Lushan earthquakes in central southern parts belt, respectively. These events revealed necessity better understanding long‐term geological evolution its effect on present dynamics crustal structure. New structural thermobarometric data offer comprehensive set paleotemperatures across P ‐ T estimates for...
Abstract Pre‐kinematic greenschist facies metamorphism is often observed in granites and basement units of mountain belts, but rarely dated accounted for orogenic cycle reconstructions. Studying pre‐kinematic alteration challenging because its usual obliteration by subsequent syn‐kinematic occurring at conditions typical the brittle–ductile transition. It is, however, to be expected that has major implications rheology upper crust. In 305 Ma‐old Variscan Bielsa massif (located Axial Zone...
Linking the timing of allanite growth to metamorphic conditions in metapelites is particularly challenging because large variety textures and chemical compositions. This study focuses on five garnet–biotite retrogressed different extents, from internal domain Longmen Shan (eastern Tibet) which few petrochronological data documenting ages are available. Microstructural observations were combined with whole-rock compositions, detailed mineral characterization, phase equilibria modelling, situ...
Abstract The Poroshiri ophiolite (Hidaka metamorphic belt, Japan) occurs within a crustal‐scale network of high‐temperature, dextral shear zones that accommodated hundreds kilometres displacement due to the opening Japan Sea in Neogene. opholitic rocks comprise ultramafic, mafic and sedimentary protoliths have been variably hydrated metamorphosed. This work investigates mechanisms timing fluid influx relative viscous deformation metagabbros amphibolites deformed during exhumation from...
<p>The effect of composition on microstructural development and mechanical strength was tested using mica-quartz-aggregates during deformation experiments.</p><p>This study used two chemically different biotite minerals mixed with quartz: (1) high F-phlogopite (2) intermediate in order to investigate the role biotite-bearing systems for shear zones strain accommodation. Shear experiments (Griggs-type apparatus) were performed mica (30 vol. %) quartz...
Understanding mass transfer associated with fluids circulation and deformation in the Alpine orogeny is often complex due to common multistage crystallization. For example, two emblematic historic Pb-Ag deposits of French Alps, Macôt-la Plagne (MP) Peisey-Nancroix (PN), a sedimentary or orogenic origin still debated. To discriminate between metallogenic models deposits, an integrative methodology combining field, microstructural, mineralogical, thermobarometrical, geochronological data was...
Micropores are commonly observed in quartz-rich rocks that deformed at depths of the viscous, metamorphic continental crust. Although presence such porosity – often occurring with angular, pyramidal shapes has major implications for fluid circulations and rock strength, whether or not they produced by deformation remains unclear. Here we provide detailed documentations pure quartz aggregates decorated micropores granitic shear bands from Naxos (Greece). Through estimations...
Extensive micro-porosity can be found in numerous examples of quartz-rich mylonites deformed crustal shear zones, but whether or not deformation is involved the production such pores remains a matter active debate. The occurrence syn-kinematic micro-scale porosity could result overall changes rock strength, as well potentially generating deep permeability. This would have major implications for fluid-rock interactions, earthquake nucleation and ore deposits. In this study, we focus on...