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The Sitathali meteorite

Published online by Cambridge University Press:  05 July 2018

T. V. Viswanathan ,
N. R. Sen Gupta ,
D. R. Das Gupta  and
S. Banerjee
T. V. Viswanathan
Affiliation:
Geological Survey of India, a Calcutta-13
N. R. Sen Gupta
Affiliation:
Geological Survey of India, a Calcutta-13
D. R. Das Gupta
Affiliation:
Geological Survey of India, a Calcutta-13
S. Banerjee
Affiliation:
Geological Survey of India, a Calcutta-13
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Summary

Sitathali is an olivine-bronzite chondrite, consisting largely of olivine (Fa18) and orthopyroxene (Fs19) with minor amounts of a clinopyroxene (Ca36Fe12Mg52), plagioclase (An12), nickel-iron, troilite, chromite, and a phosphate (apatite or merrillite). The chemical analysis of a 4 gm sample gave SiO2 39·85, TiO2 0·10, Al2O3 2·84, Cr2O3 0·35, FeO 13·27, MnO 0·28, MgO 23·01, CaO 1·84, Na2O 0·65, K2O 0·15, H2O+ 0·23, H2O− 0·05, P2O5 0·25, FeS 5·09, Fe 10·22, Ni 1·58, Co tr. total 99·76. The metal displays Neumann bands, some deformed, as well as areas of apparent flowage. Troilite locally exhibits twin lamellae and in places replaces kamacite in the plessite fields. Elsewhere it is in braided veinlets and globules, both reflecting former melting. The varied textures suggest a complex post-formational history encompassing several deformational events presumably due to breakups and possible extraterrestrial impacts.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 295 , September 1971 , pp. 335 - 343
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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Footnotes

1

Published with the kind permission of the Director-General, Geological Survey of India.

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