Computer Science
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1597y&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 597.
Computer Science
3
Mars Environment, Snc Meteorites, Olivine, Meteoritic Composition, Magma, Crystal Structure, Mars Surface, Inclusions, Dark Matter, Scanning Electron Microscopy
Scientific paper
Nakhla is one of the SNC meteorites (Shergottites-Nakhlites-Chassignite) that are widely believed to have originated on planet Mars. Martian meteorites are of great importance in understanding the geology and chemistry of Mars. Nakhla is an igneous clinopyroxenite principally composed of cumulate augite and olivine grains set in a microcrystalline mesostasis. Olivine, in the proportion of 5-18 vol pct, has a nearly homogeneous composition of Fa60. Coexisting augite and olivine are not in equilibrium, reflecting diffusive re-equilibration of olivine with late-stage liquid or subsolidus annealing. Rounded magmatic inclusions (10-350 mm in diameter) are sometimes present in large subhedral olivines that are most likely to be representative of trapped parent magma. Almost all olivines contain dark lamellar inclusions that have specific crystallographic orientation against the host olivine. Here, we report analyses of these lamellar inclusions and discuss their possible petrogeneses.
Mikouchi Takashi
Miyamoto Manabu
Murakami Tadayoshi
Yamada Ikiko
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