A5069082189- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geological and Geophysical Studies
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Reservoir Engineering and Simulation Methods
- Global Energy and Sustainability Research
- Geological formations and processes
- Island Studies and Pacific Affairs
- Geotechnical and Geomechanical Engineering
- Geological and Geophysical Studies Worldwide
- Atmospheric and Environmental Gas Dynamics
- Drilling and Well Engineering
- Granular flow and fluidized beds
- Paleontology and Stratigraphy of Fossils
- Geotourism and Geoheritage Conservation
- Marine and environmental studies
Centre National de la Recherche Scientifique
2020-2025
Université de Bretagne Occidentale
2023-2025
Ifremer
2023-2025
Nantes Université
2023
University of Modena and Reggio Emilia
2021-2023
Université de Strasbourg
2023
Laboratoire de Planétologie et Géosciences
2023
Institut de physique du globe de Paris
2019-2021
Université Paris Cité
2020-2021
Sorbonne Paris Cité
2020
Abstract Detachment faults that exhume mantle peridotites to the seafloor play a major role in accommodation of plate divergence at slow‐spreading ridges. Using 99 samples partially serpentinized dredged from nearly amagmatic segment eastern part Southwest Indian Ridge, we characterize deformation processes active root zone detachment fault systems. The is heterogeneous even sample scale and combines both brittle crystal‐plastic mechanisms. Strain localization initially controlled by...
At ultraslow, magma-poor spreading ridges, plate divergence is controlled by tectonics, leading to the formation of detachment faults. These faults cut through thick, brittle lithosphere (up 15 km) and accommodate tens kilometers displacement, exposing heterogeneous, altered rocks. Among alteration reactions, serpentinization has garnered significant attention for its role in sustaining chemosynthetic microbial life influencing spatial distribution earthquakes within lithosphere. Although...
Mantle processes control plate tectonics and exert an influence on biogeochemical cycles. However, the proportion of mantle sampled in-situ is minimal, as it buried beneath igneous crust sediments. Here we report lithological characteristics two sections from embryonic ocean drilled by International Ocean Discovery Program (IODP) in Tyrrhenian Sea. Contrary to at Mid Ridges (MORs) hyperextended passive margins, our findings reveal exceptionally heterogeneous fertile lithologies, ranging...
Felsic plutonic rocks, such as plagiogranites, are commonly found in minor proportions the lower oceanic crust. The presence of quartz magmatic origin lithosphere, especially mantle, is therefore rarely documented. Here, we present microstructural and petrological observations a gabbro-peridotite hybrid rock collected situ by HOV Nautile along southern wall Kane Fracture Zone, at base megamullion, during KANAUT expedition (Mid-Atlantic ridge, 23°N; Auzende, 1992). This sample,...
Mantle exhumation mechanisms at continent-ocean transitions (COTs) are similar to those slow and ultraslow spreading ridges, where plate divergence is also accommodated by a combination of magmatic processes detachment faulting. However, the timescales COTs poorly constrained because thick sediment cover blanketing basement rocks along mature passive margins. IODP Exp. 402 drilled Tyrrhenian Sea COT successfully recovered in situ sections mantle exhumed during Late Cenozoic extension this...
The “Fani Maoré” eruption off the coasts of Mayotte has been intensively monitored by applying methods similar to those used for subaerial eruptions. Repeated high-resolution bathymetric surveys and dredging, coupled with petrological analyses time-constrained samples, allowed tracking evolution magma over whole submarine eruptive sequence. Indeed, after one year direct ascent (Phase 1), basanitic switched a different pathway that sampled tephri-phonolitic subcrustal reservoir 2). Later,...
Abstract Oceanic Transform Faults are major plate boundaries representing the most seismogenic part of mid ocean ridge system. Nonetheless, their structure and deformation mechanisms at depth largely unknown due to rare exposures deep sections. Here we study mineral fabric deformed mantle peridotites - ultramafic mylonites collected from transpressive Atobá ridge, along northern fault St. Paul transform system in Equatorial Atlantic Ocean. We show that, pressure temperature conditions lower...
Since May 2018 till the end of 2021, Mayotte island has been locus a major submarine volcanic eruption characterized by offshore emission more than 6.5 km 3 basanitic magma. The occurred along WNW–ESE trending ridge on east flank where, in addition, several seemingly recent phonolitic bodies were also identified close to island. To define realistic scenarios magma ascent and potentially predict style an upcoming event, it is crucial have precise understanding plumbing system operating below...
Slow and ultraslow spread oceanic lithospheres consist of a mixture magmatic rocks mantle with variable alteration degrees. However, the nature, extent distribution mineral assemblages are not well constrained. Understanding this pattern at ridges is key to determining nature hydrothermal fluids seismic structure lithosphere, implications for seismogenesis ridges, transform fault zones, subduction zones. Here, we present 2D numerical models that aim explore lithosphere during magma-poor...
The study of the geological processes associated with formation ocean floor is fundamental to understand hydrothermal systems in terms genesis, evolution, duration, cyclicity and spatial distribution as well colonization these by living beings. In this project, we will use music communicate about public. constructed interaction time space three major processes: volcanism, tectonics hydrothermalism. This last process cooling transformation, through alteration rocks, oceanic floor. Finally,...