A5006494730- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Space Science and Extraterrestrial Life
- Marine and environmental studies
- Aeolian processes and effects
- Methane Hydrates and Related Phenomena
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Paleontology and Stratigraphy of Fossils
- Geological Modeling and Analysis
- Maritime and Coastal Archaeology
- Geomagnetism and Paleomagnetism Studies
- Geological and Geophysical Studies Worldwide
- earthquake and tectonic studies
- Geotechnical and Geomechanical Engineering
- Image Processing and 3D Reconstruction
- Hydrocarbon exploration and reservoir analysis
- Spaceflight effects on biology
- Geological formations and processes
- Oil and Gas Production Techniques
- Geological Studies and Exploration
- Magnetic and Electromagnetic Effects
- Geological Formations and Processes Exploration
Laboratoire de Planétologie et Géosciences
2012-2023
Centre National de la Recherche Scientifique
2010-2023
Nantes Université
2012-2023
Le Mans Université
2023
Université Nantes Angers Le Mans
2023
Université d'Angers
2020
Université Paris-Sud
1994-2008
Université Paris Cité
2008
Université Paris-Saclay
2007-2008
Sorbonne Université
2007
Dendritic valleys on the plateau and canyons of Valles Marineris region were identified from Thermal Emission Imaging System (THEMIS) images taken by Mars Odyssey. The geomorphic characteristics these valleys, especially their high degree branching, favor formation atmospheric precipitation. presence inner channels maturity branched networks indicate sustained fluid flows over geologically long periods time. These fluvial landforms occur within Late Hesperian units (about 2.9 to 3.4 billion...
Nili Fossae is a region with fresh exposures of old material. OMEGA spectral data have revealed strong diversity minerals in the region, including mafic and phyllosilicates. Phyllosilicates are found to be primarily Fe‐rich smectites (a type clay minerals). These phyllosilicates observed only on Noachian crust, four types locations: Three without any signatures other than phyllosilicates, (1) smooth layered deposits, (2) massive exhumed material, (3) crater ejecta, one location associated...
OMEGA/Mars Express has discovered large outcrops rich in phyllosilicates the region of Mawrth Vallis, Mars (around 20°W, 25°N). The is located Noachian highly cratered terrains, close to limit Martian dichotomy, where outflow channel Vallis cuts highlands. We have examined this using OMEGA spectra surface from 0.9 μ m 2.6 m, with spatial sampling 500 3 km, offering a full coverage region. show two broad bands centered at 1 and 2.2 revealing presence clinopyroxene on dark surfaces....
The degradation of impact craters provides a powerful tool to analyze surface processes in the Martian past. Previous studies concluded that large (20–200 km diameter) were strongly degraded by fluvial erosion during early history. Our goal is study progression crater through time with particular emphasis on alluvial fans and relative chronology these craters. geometric properties 283 >20 diameter analyzed two highlands Mars, north Hellas Planitia, south Margaritifer Terra, both known...
Abstract The Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) spacecraft landed successfully on Mars imaged the surface to characterize surficial geology. Here we report geology subsurface structure of landing site aid in situ geophysical investigations. InSight a degraded impact crater Elysium Planitia smooth sandy, granule- pebble-rich with few rocks. Superposed craters are common eolian bedforms sparse. During landing, pulsed retrorockets modified...
Recent gullies on Mars are suspected to be the result of liquid‐water‐bearing flows. A formation from wet flows has been challenged by studies invoking granular (dry) Our study focuses sinuous shapes observed for some recent Martian gullies. Sinuous found in locations and slopes (of 10°–15°) similar straight gullies, they therefore related same processes. Numerical simulations performed here introducing topographic variations such as obstacles, roughness, or slope changes that could possibly...
Jezero crater has been selected as the landing site for Mars 2020 Perseverance rover, because it contains a paleolake with two fan-deltas, inlet and outlet valleys. Using data from High Resolution Stereo Camera (HRSC) Imaging Science Experiment (HiRISE), we conducted quantitative geomorphological study of valleys paleolake. Results show that strongest erosion is related to network deep cut into highland bedrock well upstream likely formed before formation regional olivine-rich unit. In...
A closed depression in the Noctis Labyrinthus region of Mars (at 10.4°S, 98.6°W), believed to have formed Late Hesperian, holds an inner pit partially filled with several hundred meters stratified material. Compact Reconnaissance Imaging Spectrometer for (CRISM) visible‐near infrared reflectance data reveal signatures numerous hydrated minerals including halloysite/kaolinite, Fe‐smectite, Si‐OH bearing phases and Fe‐sulfates (polyhydrated, monohydrated, hydroxylated types, jarosite). We use...
Abstract Measurements of ground compliance at the InSight landing site—describing surface response to pressure loading—are obtained from seismic and meteorological data. Compliance observations show an increase with frequency indicating presence a stiffer rock layer beneath exposed regolith. We performed Markov chain Monte Carlo inversion investigate vertical profile elastic parameters down 20 m below InSight. was inverted both freely assuming prior knowledge compaction in regolith,...
Fluvial landforms are observed on the plateau near Echus Chasma and other locations Valles Marineris using high resolution (10 to 50 m/pixel) Mars Express images topography. Branching valleys have a 20‐ 100‐m deep V‐shape profile typical of fluvial processes. Their incision occurred in thin (<150 m) weak, dark unit that overlies basement. The distributed close watershed boundaries as expected for overland flows, different from pure glacial or hydrothermal 2D geometry valley networks show...
Abstract The InSight lander rests on a regolith‐covered, Hesperian to Early Amazonian lava plain in Elysium Planitia within ∼27‐m‐diameter, degraded impact crater called Homestead hollow . km cm‐scale stratigraphy beneath the is relevant mission's geophysical investigations. Geologic mapping and statistics indicate that ∼170 m of mostly basaltic lavas are underlain by Noachian (∼3.6 Ga) materials possible sedimentary origin. Up ∼140 this volcanic resurfacing occurred at 1.7 Ga, accounting...