A5042678660- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Geophysical and Geoelectrical Methods
- Geophysical Methods and Applications
- Astro and Planetary Science
- Geochemistry and Geologic Mapping
- Ancient Mediterranean Archaeology and History
- Maritime and Coastal Archaeology
- Geochemistry and Elemental Analysis
- Archaeological Research and Protection
- Geological and Geophysical Studies
- Iron oxide chemistry and applications
- earthquake and tectonic studies
- Geological and Geochemical Analysis
- Geological formations and processes
- Space Science and Extraterrestrial Life
- Seismic Waves and Analysis
- Groundwater and Isotope Geochemistry
- Sustainable Industrial Ecology
- Image Processing and 3D Reconstruction
- Earthquake Detection and Analysis
- Aeolian processes and effects
- Soil Carbon and Nitrogen Dynamics
- Pleistocene-Era Hominins and Archaeology
Centre de Recherche et d’Enseignement de Géosciences de l’Environnement
2005-2020
Institut de Recherche pour le Développement
2015-2020
Centre National de la Recherche Scientifique
2006-2020
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2020
Sustainable Europe Research Institute
2004-2020
Aix-Marseille Université
2006-2019
Laboratoire Méditerranéen de Préhistoire Europe Afrique
1997-2006
Cezanne (Italy)
2006
Beicip Franlab (France)
2005
Defect moment of antiferromagnets yields the highest remanent coercivity observed among minerals, and previous studies have been unable to reach saturation isothermal magnetization (IRM) in some goethite hematite, even up 20 Teslas, using resistive Bitter magnets. To go further, acquisition IRM at room temperature has monitored on various natural synthetic hematite samples pulsed magnetic fields 57 Teslas. “Coarse” is saturated around 5 T, low unblocking (T B , i.e. with crystallinity or Al...
Laterites preserved on both sides of the Western Ghats Escarpment Peninsular India have formed by long-term lateritic weathering essentially after India–Seychelles continental break-up following Deccan Traps emplacement ( c. 63 myr ago). Supergene manganese ores were Late Archean protores. Among Mn oxides composing ores, cryptomelane (K-rich oxide) was characterized and dated 40 Ar/ 39 Ar geochronology. Measured ages complement those previously obtained in other South Indian from hinterland...
[1] We present low temperature magnetic data (thermal demagnetization, hysteresis) obtained on thirty three ordinary chondrite meteorites. A transition is observed in the 40–80 K range (average 66 K), and interpreted as a ferrimagnetic to paramagnetic phase transition. quantitative analyses of changes magnetization across chemical elemental argue that chromite, common accessory mineral meteorites, undergoing transition, not troilite or tetrataenite proposed previous studies. Moreover, we...
Research Article| December 01, 2004 Weathering of iron-rich phases in simulated Martian atmospheres Vincent Chevrier; Chevrier 1Centre Européen de Recherche et d'Enseignement en Géosciences l′Environnement, Europôle l′Arbois, BP 80, 13545 Aix-en-Provence, cedex 04, France Search for other works by this author on: GSW Google Scholar Pierre Rochette; Rochette Pierre-Etienne Mathé; Mathé Olivier Grauby 2Centre Matière Condensée Nanosciences, Centre National la Scientifique, Campus...
We have previously developed a method for characterizing and localizing 'homogeneous' buried sources, from the measure of potential anomalies at fixed height above ground (magnetic, electric gravity).This is based on theory uses properties Poisson kernel (real by definition) continuous wavelet theory.Here, we relax assumption sources introduce that call 'multiscale tomography'.Our approach harmonic extension observed magnetic field to produce complex source use solution Laplace equation...
The Roman and early medieval Richeaume XIII necropolis in Provence (France) was systematically studied using magnetic prospection electrical resistivity tomography (ERT). Remains of a limestone-made building are embedded reddish clay formation bearing iron oxides. This produces an interesting negative anomaly, whereas the wall itself is resistive. Other dipolar anomalies correlated with location sepulchres, either covered by roman, strongly magnetized tegulae, or corresponding to burnt...
Characteristic trends in landuse and climate highlight critical challenges future resource management along the tropical topoclimosequence (TCS) of Rungwe Volcanic Province (RVP), a major headwater biodiversity food reservoir Tanzania.The RVP orography supports coherent distribution agroecosystems livelihoods, from hot irrigated lowlands to endangered afromontane forests above 1500 m.a.s.l.Recent increases deforestation, land fragmentation soil denudation/compaction densely populated TCS...
Maize is the main staple crop in East African Mountains. Understanding how edaphic characteristics change along altitudinal gradients important for maximizing maize production Highlands, which are key areas region. This study evaluated and compared levels of some macro micro-elements (Al, Ca, Fe, K, Mg, Mn, Na P) other soil parameters (pH, organic carbon content, texture [i.e. % Sand, Clay Silt], cation exchange capacity [CEC], electric conductivity [EC], water holding [HC]). Soil samples...
The Néel temperatures (T N ) of synthetic goethites (α‐FeOOH), substituted with diamagnetic elements (Al, Ga) have been determined from the temperature dependence their low‐field susceptibility using a Kappabrige AC bridge. These proved to be identical those derived more conventional measurements high‐field or remanent magnetization versus temperature, and in good agreement inferred Mössbauer models. based‐technique appears offer precise rapid method determining T . While coincides maximum...
Tropical rainfall isotopic composition results from complex processes. The climatological and environmental variability in East Africa increases this complexity. Long isotope datasets are needed to fill the lack of observations region. At Kisiba Masoko, Tanzania, rain have been monitored during 6 years. Mean year profiles allow analyse seasonal variations. mean annual is 2099 mm with a rain-weighted −3.2 ‰ for δ18O −11.7 δ2H. consistent available data although they present their own...