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Twinning and intergrowth of olivine crystals in chondritic meteorites

Published online by Cambridge University Press:  05 July 2018

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

The angular relationships among sets of olivine plates in barred chondrules were investigated on the universal stage to test a suggestion that such chondrules represent exsolution and inversion from a pre-existing jadeitic pyroxene. In one of sixty-seven cases studied, adjacent plates represent olivine twinning on (100); the others vary randomly and correspond to neither olivine nor pyroxene twinning. On this basis and from other evidence, we conclude that the mineralogy and texture of barred chondrules are primary and due to rapid crystallization of ultrabasic magma in a low-pressure environment.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 295 , September 1971 , pp. 324 - 327
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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Footnotes

1

Present address: Department of Geology, Parks Road, Oxford, England.

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