Martian Dunite NWA 2737: Petrographic constraints on geological history, shock events, and olivine color
نویسندگان
چکیده
منابع مشابه
Metal-saturated sulfide assemblages in NWA 2737: Evidence for impact-related sulfur devolatilization in Martian meteorites
NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal-saturated Fe-Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni-poor troilite (Fe ⁄S = 1.0 ± 0.01), sometimes Cr-bearing (up to 1 wt%), coexists with micrometer-...
متن کاملXenon Isotopic Components in Nwa 2737– a Chassignite from the Hot Desert
Introduction: NWA 2737 recently recovered from the Moroccan sahara is a martian dunite. Based on mineralogy (e.g., 89.6 % olivine), major (Fe/Mn) and trace element chemistry as well as oxygen isotopic signature (∆O = 0.305), it has been identified as the second Chassignite [1, 2]. The meteorite however has a few differences from Chassigny pointing to differences in petrogenesis and martian evol...
متن کاملPetrographic Constraints on Shock Induced P/t Conditions in Shergottites
Introduction: Martian meteorites (MM) comprise rocks shocked in the range of 5-55 GPa during natural impact events [1]. Together with the suite of experimentally shocked rocks, they are valuable assets for the study of the progressive stages of shock metamorphism. Petrographic investigations of MM, in combination with shock and post shock temperature calculations are presented. This data set is...
متن کاملPYROXENE CRYSTAL CHEMISTRY AND THE LATE COOLING HISTORY OF NWA 2737. B. Re- ynard,
ynard, P. Beck, J-A. Barrat and M. Bohn, Laboratoire des Sciences de la Terre, CNRS UMR 5570, Ecole Normale Supérieure de Lyon, 46 allée d’Italie, 69364 Lyon Cedex 7, France. E-mail : [email protected], Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Ranch road NW, DC20015. Email:[email protected]. U.B.O.-I.U.E.M., place Nicolas Copernic, F-29280 Plouzané Cedex, France....
متن کاملHeterogeneous Noble Gas Distribution in the Nwa 2737
Introduction: NWA 2737 is the second chassignite, whose brown colored appearance different from Chassigny would be due to shock metamorphism. Noble gas compositions so far reported for the NWA 2737 [1, 2] are largely different from those of Chassigny. High Xe/Xe up to ~2 observed in NWA 2737 might be shock-implanted Martian atmospheric Xe. Common ejection event at ∼11 Myr was suggested for NWA ...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 2007
ISSN: 0148-0227
DOI: 10.1029/2006je002777