Petrology of Martian meteorite Northwest Africa 998
نویسندگان
چکیده
منابع مشابه
Petrology and geochemistry of nakhlite MIL 03346: A new Martian meteorite from Antarctica
MIL 03346 is a newly discovered meteorite from Miller Range in Antarctica, which belongs to the nakhlite group of Martian meteorites [1]. It is an unbrecciated, mediumgrained olivinebearing clinopyroxenite with a cumulate texture, similar to the 6 other previously known nakhlites. This is only the 2 nakhlite in Antarctic collections, the other being Yamato 000593 and its pairs. The Meteorite Wo...
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Caffee, N. Vogel, R. Wieler, M. D. Leclerc, and A. J. T. Jull, Space Sciences Laboratory, University of California, Berkeley, CA 94720-7450, USA ([email protected]), Department of Physics, Purdue University, West Lafayette, IN 47907-1396, USA ([email protected]), ETH-Zürich, CH-8092, Switzerland ([email protected], [email protected]), NSF Arizona AMS Facility, University of Arizona, Tuc...
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Northwest Africa (NWA) 5790 is the most recently discovered member of the nakhlite group. Its mineralogy differs from the other nakhlites with a high abundance mesostasis (38.1 3.6 vol%) and scarcity of olivine (4.0 2.2 vol%). Furthermore, zoning of augite phenocrysts, and other petrographic and chemical characteristics suggest that NWA 5790 samples the chilled margin of its parent lava flow/si...
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Despite evidence for liquid water at the surface of Mars during the Noachian epoch, the temperature of early aqueous environments has been impossible to establish, raising questions of whether the surface of Mars was ever warmer than today. We address this problem by determining the precipitation temperature of secondary carbonate minerals preserved in the oldest known sample of Mars’ crust—the...
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The halogen concentrations of a number of Martian meteorites vary significantly, with larger variations observed in I/Cl compared to Br/Cl. One striking feature is the high I/Cl ratios associated with those meteorites found in Antarctica. Removal of low temperature, superficial contamination does not significantly reduce the I/Cl ratio [1], indicating that processing in Antarctica is responsibl...
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ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2008
ISSN: 1086-9379
DOI: 10.1111/j.1945-5100.2008.tb01085.x