A5014621639- earthquake and tectonic studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Methane Hydrates and Related Phenomena
- Rock Mechanics and Modeling
- Seismic Imaging and Inversion Techniques
- Geotechnical and Geomechanical Engineering
- Geology and Paleoclimatology Research
- Geological and Geophysical Studies Worldwide
- Hydrocarbon exploration and reservoir analysis
- Geological formations and processes
- Landslides and related hazards
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- Geological and Geophysical Studies
- Earthquake Detection and Analysis
- Granular flow and fluidized beds
- Drilling and Well Engineering
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- CO2 Sequestration and Geologic Interactions
- Geological Modeling and Analysis
- Acoustic Wave Resonator Technologies
- Soil and Unsaturated Flow
- Concrete and Cement Materials Research
Université d'Orléans
2014-2024
Bureau de Recherches Géologiques et Minières
2015-2024
Institut des Sciences de la Terre
2015-2024
Institut des Sciences de la Terre d'Orléans
2014-2024
Centre National de la Recherche Scientifique
2015-2024
Laboratoire d'Hydrodynamique
2017-2023
Observatoire des sciences de l'Univers Paris-Saclay
2023
Japan Agency for Marine-Earth Science and Technology
2008-2014
Tokyo University of Science
2007
The University of Tokyo
2006
Research Article| August 01, 2012 Eclogite breccias in a subducted ophiolite: A record of intermediate-depth earthquakes? S. Angiboust; Angiboust * 1ISTEP, UMR CNRS 7193, UPMC Sorbonne Universités, F-75005 Paris, France *E-mail: samuel.angiboust@upmc.fr. Search for other works by this author on: GSW Google Scholar P. Agard; Agard Yamato; Yamato 2Geosciences Rennes, Université Rennes1, F-35 042 H. Raimbourg 3ISTO, d'Orléans, F-45071 Orléans, Author and Article Information Publisher:...
Geophysical evidence of high fluid pressures and the presence fluidized microstructures provide two independent arguments supporting existence fluid-like materials within core slipping fault zones crust. The nature these varies depending on specific case, including H2O-rich fluid, ultra-comminuted rock, melt formed after frictional slip. persistence such over several episodes slip is questionable, because may decrease associated host-rock damage, while melts solidify almost...
Diapiric intrusions induce significant thermal and mechanical changes in the surrounding host rock, including heating deformation. While previous studies have focused on intrusion formation, few models detail field evolution during progressive pluton boundary migration, even less, with associated host-rock This study aims to simulate Flamanville granitic diapir's growth cooling processes investigate coupling between deformation aureole contact metamorphism. The intrusion, located Normandy,...
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...
[1] Active eclogitization has recently been inferred at depth beneath the Himalaya from geophysical observations, and mechanical consequences of can be observed in field eroded extended nappe stack Scandinavian Caledonides. There, Proterozoic metastable granulites igneous protoliths underwent partial during collision Baltica with Laurentia. The reaction began pseudotachylites veins eventually formed a connected network eclogite-facies shear zones that localized deformation weakened lower...
In this study, we used porosity to assess the compaction state of Nankai accretionary wedge sediments and any implications for stress pore pressure. However, hydrous minerals affect measurements, accounting them is essential toward defining interstitial truly representative state. The water content was measured in core samples estimated from logging data using a resistivity model shale. We cation exchange capacity correct amount bound clay estimates surface conductivity minerals. results...
The Shimanto Belt in SW Japan is commonly described as a paleo-accretionary prism, whose structure explained by continuous accretion like modern accretionary prisms such Nankai. We carried out structural study of the Cretaceous to Miocene part on Kyushu test this hypothesis accretion. Most deformation structures observed field are top-to-the-SE thrusts, fitting well scheme wedge growth frontal or underplating. In particular, tectonic mélange at top Hyuga Group records penetrative reflecting...
The very low water content of the granulitic unit Holsnøy, in Bergen Arcs, Norway, caused its partial metastable preservation throughout Caledonian burial end exhumation, leading to observed mixture completely eclogitized and uneclogitized rocks. eclogitization granulite-facies protolith led a density increase ∼10%, but also large rheological weakening that resulted localization all deep ductile deformation eclogite fraction. We address consequences on subduction dynamics concomitant...
We studied undeformed sediment and accreted strata recently recovered by Ocean Drilling Program/Integrated Program (ODP/IODP) drilling in Nankai Trough convergent margin to unravel the changes physical properties from initial deposition incipient deformation. have derived acoustic (V p ) mechanical (uniaxial poroelastic compliance, compaction amplitude) of samples various drill sites along Muroto (ODP 1173) Kii transects (IODP C0001, C0002, C0006, C0007) isotropic loading tests where...
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...
Fossil structures, such as exhumed accretionary prisms, are the only direct recorders of fluids wetting plate interface near base seismogenic zone. By studying it is thus possible to determine physicochemical properties and geometry dynamics their circulation. We considered here two transects encompassing brittle-plastic transition (BPT) zone, in Franco-Italian Alps Shimanto Belt Japan, compared our data with a broader set examples from literature. On quartz that grew synkinematically at...
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:...