Université de la Réunion

Philippe JEAN-PIERRE

Professeur des universités en sciences de gestion

Recherche par mots-clés :

Filtrer par type d'activité :

  • Sulfates have been discovered by the OMEGA spectrometer in different locations of the planet Mars. They are strongly correlated to light toned layered deposits in the equatorial regions. West Candor Chasma is the canyon with the thickest stack of layers and one with the largest area covered by sulfates. A detailed study coupling mineralogy derived from OMEGA spectral data and geology derived from HRSC imager and other datasets leads to some straightforward issues. The monohydrated sulfate kieserite is found mainly over heavily eroded scarps of light toned material. It likely corresponds to a mineral present in the initial rock formed either during formation and diagenesis of sediments, or during hydrothermal alteration at depth, because it is typically found on outcrops that are eroded and steep. Polyhydrated sulfates, that match any Ca-, Na-, Fe-, or Mg-sulfates with more than one water molecule, are preferentially present on less eroded and darker outcrops than outcrops of kieserite. These variations can be the result of a diversity in the composition and/or of the rehydration of kieserite on surfaces with longer exposure. The latter possibility of rehydration in the current, or recent, atmosphere suggests the low surface temperatures preserve sulfates from desiccation, and, also can rehydrate part of them. Strong signatures of iron oxides are present on sulfate-rich scarps and at the base of layered deposits scarps. They are correlated with TES gray hematite signature and might correspond to iron oxides present in the rock as sand-size grains, or possibly larger concretions, that are eroded and transported down by gravity at the base of the scarp. Pyroxenes are present mainly on sand dunes in the low lying terrains. Pyroxene is strongly depleted or absent in the layered deposits. When mixed with kieserite, local observations favor a spatial mixing with dunes over layered deposits. Sulfates such as those detected in the studied area require the presence of liquid water to form by precipitation, either in an intermittent lacustrine environment or by hydrothermal fluid circulation. Both possibilities require the presence of sulfur-rich groundwater to explain fluid circulation. The elevation of the uppermost sulfate signatures suggests the presence of aquifers up to 2.5 km above datum, only 1 km below the plateau surface.

    • Type de publi. : Article dans une revue
    • Date de publi. : 01/01/2008
    • Auteurs : Nicolas MangoldAline GendrinBrigitte GondetStéphane Le MouélicCathy Quantin-NatafV. AnsanJean-Pierre BibringYves LangevinPhilippe MassonGerhard Neukum
    Fiche détaillée
  • exposition François-Xavier Fabre (Montpellier, Turin, 2007-2008)

    • Type de publi. : Autre publication
    • Date de publi. : 01/01/2008
    • Auteurs : Philippe Bordes
    Fiche détaillée
  • LIG at ImageCLEF 2008, Evaluating Systems for Multilingual and Multimodal Information Access

    • Type de publi. : Communication dans un congrès
    • Date de publi. : 01/01/2008
    • Auteurs : Loïc MaisonnassePhilippe MulhemÉric GaussierJean-Pierre Chevallet
    Fiche détaillée
  • Soil CO2 effluxes, soil carbon balance, and early tree growth following savannah afforestation in Congo: Comparison of two site preparation treatments

    • Type de publi. : Article dans une revue
    • Date de publi. : 01/01/2008
    • Auteurs : Yann NouvellonDaniel EpronAntoine KinanaOliver HamelAndré MabialaRémi d'AnnunzioPhilippe DeleporteLaurent Saint‐andréClaire MarsdenOlivier RoupsardJean-Pierre BouilletJean-Paul Laclau
    Fiche détaillée
  • Droit administratif des biens : domaine public et privé, travaux et ouvrages publics, expropriation

    • Type de publi. : Ouvrage (y compris édition critique et traduction)
    • Date de publi. : 01/01/2008
    • Auteurs : Jean-Marie AubyPhilippe TerneyreJean-Bernard AubyPierre Bon
    Fiche détaillée
  • Transiting exoplanets from the CoRoT space mission. III. The spectroscopic transit of CoRoT-Exo-2b with SOPHIE and HARPS

    • Type de publi. : Article dans une revue
    • Date de publi. : 01/01/2008
    • Auteurs : François BouchyDidier QuelozMagali DeleuilB. LoeilletArtie P. HatzesSuzanne AigrainRoi AlonsoMichel AuvergneAnnie BaglinPierre BargeWilly BenzP. BordéHans J. DeegR. de la RezaRudolf DvorakAnders EriksonMalcolm C. FridlundPhilippe GondoinTristan GuillotGuillaume HébrardLaurent JordaHelmut LammerAlain LégerAntoine LlebariaPierre MagainMichel MayorClaire MoutouMarc OllivierM. PätzoldFrancesco PepeFrédéric PontHeike RauerDaniel RouanJean SchneiderA. H. M. J. TriaudStéphane UdryGünther Wuchterl
    Fiche détaillée
  • Polyelectrolyte multilayer coatings that resist protein adsorption at rest and under stretching

    • Type de publi. : Article dans une revue
    • Date de publi. : 01/01/2008
    • Auteurs : Andreas ReischJoseph HemmerléJean-Claude VoegelEric GonthierGero DecherNadia Benkirane-JesselArmelle ChassepotDamien MertzPhilippe LavallePhilippe MésiniPierre Schaaf
    Fiche détaillée
  • Microchemical imaging of iodine distribution in the brown alga Laminaria digitata suggests a new mechanism for its accumulation

    • Type de publi. : Article dans une revue
    • Date de publi. : 01/01/2008
    • Auteurs : Elodie Françoise VerhaegheAurélien FraysseJean-Luc Guerquin-KernTing-Di WuGuillaume DevèsCharles MioskowskiCatherine LeblancOrtega RYves AmbroisePhilippe Potin
    Fiche détaillée
  • Chronic atrial fibrillation ablation impact on endocrine and mechanical cardiac functions

    • Type de publi. : Article dans une revue
    • Date de publi. : 01/01/2008
    • Auteurs : Frederic SacherJean-Benoît J.-B. CorcuffPhilippe SchraubValérie Le BouffosAgnès GeorgesSamuel O. JonesStéphane LafittePierre BordacharMélèze HociniJacques ClémentyMichel HaïssaguerreLaurence BordenaveRaymond RoudautPierre Jais
    Fiche détaillée
  • Initial stages of Fagus sylvatica wood colonization by the white-rot basidiomycete Trametes versicolor: Enzymatic characterization

    • Type de publi. : Article dans une revue
    • Date de publi. : 01/01/2008
    • Auteurs : Serge LekounougouS. MounguenguiStéphane DumarçayChristophe RosePierre-Emmanuel CourtyJean GarbayePhilippe GerardinJean-Pierre JacquotÉric Gelhaye
    Fiche détaillée