title: Putative indigenous carbon-bearing alteration features in martian meteorite Yamato 000593.
abstract: We report the first observation of indigenous carbonaceous matter in the martian meteorite Yamato 000593. The carbonaceous phases are heterogeneously distributed within secondary iddingsite alteration veins and present in a range of morphologies including areas composed of carbon-rich spheroidal assemblages encased in multiple layers of iddingsite. We also observed microtubular features emanating from iddingsite veins penetrating into the host olivine comparable in shape to those interpreted to have formed by bioerosion in terrestrial basalts.
authors.affiliation: 1 Jet Propulsion Laboratory , California Institute of Technology, Earth, Astronomy & Physics Mission Formulation, Pasadena, California.
authors.forename: Lauren M
authors.initials: LM
authors.lastname: White
authors.forename: Everett K
authors.initials: EK
authors.lastname: Gibson
authors.forename: Kathie L
authors.initials: KL
authors.lastname: Thomas-Keprta
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Clemett
authors.forename: David S
authors.initials: DS
authors.lastname: McKay
mesh_terms: D002244:Carbon / Q000032:analysis*; D005118:Extraterrestrial Environment; D058085:Iron Compounds / Q000737:chemistry; D017616:Magnesium Compounds / Q000737:chemistry; D018535:Mars; D019110:Meteoroids; D008855:Microscopy, Electron, Scanning; D017640:Silicates / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission
chemical_list: D058085:Iron Compounds; D017616:Magnesium Compounds; D017640:Silicates; D002244:Carbon; C034475:olivine
keywords: Meteorite-Yamato 000593-Mars-Carbon.