Computer Science
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985metic..20..479r&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 20, Sept. 30, 1985, p. 479-489.
Computer Science
14
Carbonaceous Chondrites, Chondrites, Meteoritic Composition, Aluminum Compounds, Calcium Compounds, Phosphates, Pyroxenes, Sulfides, Meteorites, Phosphate, Sulfide, Aluminum, Calcium, Ordinary Chondrites, Carbonaceous Chondrites, Element Ratios, Cv3 Chondrites, Co3 Chondrites, Mineralogy, Composition, Chondrites, Stony Meteorites, Comparisons, Samples, Meteorites, H Chondrites, L Chondrites, Ll Chondrites, Metal, Grains, Formation, Thermal Effects, Description
Scientific paper
Electron microscopic examinations were carried out on various chondrites to re-examine previously reported anomalously high Al/Ca ratios. Polished thin sections of the three CV3, two CO3 and the Krymka LL3 chondrites were scanned to characterize the phosphate-sulfide inclusions. The formation of the assemblages was interpreted as proceeding in five steps, starting with the formation of metal grains with early nebular material and finishing with a reaction between schreibersite with Ca, O and Cl to form merrillite and chloropatite. The abundances of the observed assemblages were not high enough to imply Al/Ca ratios similar to whole-rocks. It is concluded that the specimens were originally examined with a broader electron beam than used to examine standard samples, and resulted in the anomalously high Al/Ca ratios.
Grossman Jeffrey N.
Rubin Alan E.
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