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Calc-aluminous insets in olivine of the Sharps chondrite

Published online by Cambridge University Press:  05 July 2018

R. T. Dodd
R. T. Dodd*
Affiliation:
Department of Earth and Space Sciences, State University of New York at Stony Brook, Stony Brook, N.Y., U.S.A.
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Summary

A 250 µm olivine crystal in Sharps contains 1 to 5 µm insets identified by microprobe analysis as ferroan monticellite, spinel, and fassaite with average compositions: olivine (host), (Fe0·44Mg1·51Ca0·05) (Si0·99Al0·01)O4; ferroan monticellite, (Ca0·89Fe0·41Mg0·66) (Si1·00Al0·02)O4; spinel, (Fe0·41Mg0·59)(Fe0·063+Cr0·23Al1·69Si0·01Ti0·01)O4; and fassaite, Ca0.96(Fe0·01Mg0·59)(Al0·18Ti0·07Fe0·163+)(Si1·53Al0·47)O6. Textural and experimental data suggest early crystallization of spinel from a calcic olivine melt, exsolution of ferroan monticellite from the host olivine, and reaction of spinel and ferroan monticellite to form fassaite. The severe depletion of alkalies and silica in this crystal suggests it is a residue from vapour fractionation.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 296 , December 1971 , pp. 451 - 458
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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