Computer Science
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996m%26ps...31..807p&link_type=abstract
Meteoritics, vol. 31, pages 807-815.
Computer Science
2
Scientific paper
Olivine grains from selected meteorites (the Springwater pallasite, the Lowicz mesosiderite, the ALHA 84025 brachinite, the Krymka LL3 chondrite, and the Calcalong Creek lunar meteorite) and terrestrial rocks (San Carlos forsterite and Rockport fayalite) were studied by optical microscopy and high- precision EPMA. Detailed microprobe traverses revealed regular igneous zoning in the Krymka and Calcalong Creek olivines. Traverses across the San Carlos forsterite grain are flat and display no chemical variations larger than the 2s range of counting error (10.2 mole % Fa). Traverses across olivine grains in the ALHA 84025, Lowicz, and Springwater meteorites show regular patterns of periodic or wavy chemical variations well exceeding the 2s uncertainty range. However, no lamellar structure was seen in BSE images. It is suggested that the periodic chemical variations may be due to spinodal decomposition of primary more or less homogeneous grains. I conclude that the absence of earlier reports of such variations simply means that olivine grains in equilibrated meteorites have not been examined closely enough to detect them.
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