A5021890209- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Earthquake Detection and Analysis
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Hydraulic Fracturing and Reservoir Analysis
- Advanced Data Processing Techniques
- Geochemistry and Geologic Mapping
- Drilling and Well Engineering
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
Institut des Sciences de la Terre
2019-2024
Bureau de Recherches Géologiques et Minières
2020-2024
Centre National de la Recherche Scientifique
2020-2024
Université d'Orléans
2020-2024
Institut des Sciences de la Terre d'Orléans
2019-2022
Laboratoire d'Hydrodynamique
2019-2021
Abstract We have carried a structural study across Kodiak accretionary complex in Alaska, USA, order to describe its thermal structure and decipher the processes of exhumation. The consists stack tectonic mélanges coherent units. Mélanges are characterized by simple shear deformation with pervasive network top‐to‐the‐trench zones, whereas units affected principally horizontal shortening, except for spatially limited outcrops Central Belt. Peak temperatures estimated using Raman spectroscopy...
Abstract In several examples of subduction zones, we compared pairs quartz veins formed either at the lower temperatures seismogenic zone (260°C or below), higher its downdip limit (∼330°C). All analyzed here are mode I cracks that contemporaneously with host‐rock main stage deformation peak burial conditions. Lower‐temperature show crystals euhedral shapes and growth rims, while higher‐temperature contain crack‐seal microstructures. lower‐temperature realm, rims have alternatingly either:...
Whether seismic rupture propagates over large distances to generate mega-earthquakes or is rapidly aborted mainly depends on the slip processes within fault core, including particularly frictional melting intense grain-size reduction and amorphization. The record of in exhumed zones consists many instances Black Faults Rocks, dark glass-like-filled aphanitic veins that have been interpreted as resulting from quenching melts, i.e. pseudotachylytes. Such interpretation has nevertheless...
Tectonic mélanges, penetrative mixes of sediments and basalts, are often interpreted as fossil subduction plate interfaces. These formations, marked by intense deformation, contain witnesses past earthquakes commonly include remnants the oceanic crust subducting plate. The original process that led to mixing basalts is controversial, classically relies either on tectonic slicing downgoing plateduring subduction, or pre-subduction, olistostrome-forming sedimentary mixing. In...
<p>Whether seismic rupture propagates over large distances to generate mega-earthquakes or on the contrary slows down quickly, is heavily dependent slip processes operating within fault core, such as frictional melting intense grain-size reduction and amorphization. The record, in fossil zones, of slip, consists many instances Black Faults Rocks (BFR), that a generally thin dark aphanitic veins similar volcanic glasses, which cross-cuts sharply weakly foliated tectonic...
<p>Veins that form contemporaneously with deformation are the best recorders of fluids circulating in depths orogenic and subduction zones. We have analyzed syn-kinematic quartz veins from accretionary prisms (Shimanto Belt Japan, Kodiak prism Alaska) tectonic nappes collisional orogens (Flysch à Helminthoïdes Alps, southern domain variscan Montagne Noire), which formed at temperature conditions between 250 350°C, i.e. spanning downdip...
<p>The Raman Spectroscopy of Carbonaceous Materials (RSCM) permits to quantify the degree crystallinity carbonaceous materials (CM), which increases upon geological heating. First believed be a reliable indicator metamorphic grade (Pasteris and Wopenka, 1991 ; Wada et al., 1996), quantitative evolution CM has been proposed as new geothermometers for wide range temperature between 200 650°C (Beyssac 2002 Rahl 2005 Lahfid 2010 Kouketsu...
<p>Whether seismic rupture propagates over large distances to generate earthquakes or on the contrary slows down quickly, is heavily dependent slip processes operating within fault core. One possible scenario that during slip, frictional work induces a local and transient release of heat up reach melting rock. This melt-lubrication plane results in resistance drop promotes further propagation fault. Nonetheless, assessing occurrence flash has turned problematic, especially...
<p>Veins that form contemporaneously with deformation are the best recorders of fluids circulating in depths orogenic and subduction zones. We have analyzed syn-kinematic quartz veins from accretionary prisms (Shimanto Belt Japan, Kodiak Complex Alaska) tectonic nappes collisional orogens (Flysch à Helminthoïdes Alps, southern variscan Montagne Noire), which formed at temperature conditions between 250 350°C, i.e. spanning downdip limit...
Abstract Whether seismic rupture propagates over large distances to generate mega-earthquakes or is rapidly arrested mainly depends on the slip processing within fault core, including in particular frictional melting intense grain-size reduction and amorphization. The record of exhumed zones consists many instances Black Faults Rocks, dark glass-like-filled aphanitic veins that have been interpreted as resulting from quenching melts, i.e., pseudotachylytes. Such interpretation has...