Computer Science
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4769h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, p. 4769
Computer Science
47
Shergottites, Petrography, Geochemistry, Meteoritic Composition, Antarctic Regions, Petrology, Nakhlites, Chassignites
Scientific paper
LEW88516 (LEW), like its near-twin ALH77005 (ALH), is a maskelynite-bearing harzburgite and a member of the SNC family of achondrites. LEW is texturally heterogenous, exhibiting both poikilitic (pyroxene oikocrysts enclosing subhedral olivine and euhedral chromite) and non-poikilitic (cumulus framework of olivine and minor pyroxene, with interstitial maskelynite and secondary minerals) textures. Pyroxenes in LEW appear to be slightly more iron-rich and more varied in composition than those in ALH. LEW olivines have distinctly higher Fe contents; most of the olivine grains in LEW have compositions more iron-rich than any ALH olivine observed. LEW olivine in non-poikilitic areas is substantially more iron-rich than olivine armored by pyroxene. Trace element and minor element patterns of LEW and ALH minerals are essentially identical and are consistent with closed-system, large-volume crystallization of the major phases, followed by development of later phases after assembly of the crystal pile.
Crozaz Ghislaine
Harvey Ralph P.
McSween Harry Y. Jr.
Wadhwa Meenakshi
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