title: Proposed in situ secondary ion mass spectrometry on Mars.
abstract: Secondary ion mass spectrometry is a powerful analytical tool, which has the potentiality, through molecular ion emission, of detecting minor phases, as well as the unique capability of directly measuring isotope abundances in mineral or organic phases without any prior physical, chemical or thermal processing.  Applied to the in situ analysis of the Martian regolith, it can provide evidence of the presence of carbonates and, by inference (if carbonates constitute significant deposits), of past liquid water--a necessary condition for the development of life.  In addition, oxygen isotopic composition of carbonates preserves a record of the temperature at which this phase precipitated and may therefore help decipher the past climatology of Mars.  Detection of a carbon isotopic composition shift between carbonates and organic matter (on Earth, the result of a kinetic fractionation effect during photosynthesis) would provide a definite clue regarding the existence of a past biochemical activity on Mars.
authors.affiliation: GREMI, Université d'Orléans, France.
authors.forename: R L
authors.initials: RL
authors.lastname: Inglebert
authors.forename: B
authors.initials: B
authors.lastname: Klossa
authors.forename: J C
authors.initials: JC
authors.lastname: Lorin
authors.forename: R
authors.initials: R
authors.lastname: Thomas
mesh_terms: D002247:Carbon Isotopes; D002254:Carbonates / Q000032:analysis; D002980:Climate; D018559:Exobiology; D055593:Geological Phenomena; D005844:Geology; D018535:Mars; D013058:Mass Spectrometry / Q000379:methods*; D000069497:Origin of Life; D010100:Oxygen / Q000032:analysis; D010103:Oxygen Isotopes; D017640:Silicates / Q000032:analysis; D012987:Soil / Q000032:analysis*; D013696:Temperature; D014867:Water / Q000032:analysis
chemical_list: D002247:Carbon Isotopes; D002254:Carbonates; D010103:Oxygen Isotopes; D017640:Silicates; D012987:Soil; D014867:Water; D010100:Oxygen