Oxygen isotopic compositions of petrographically described inclusions from Antarctic unequilibrated ordinary chondrites

P(論文) Several inclusions from the Antarctic unequilibrated ordinary chondrites (ALH-764 (LL3), ALH-77015 (L3) and Y-790448 (L3)) were excavated and their petrography, chemical and oxygen isotopic compositions were determined. The coherent data indicates that precursors of the ordinary chondrites con...

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Bibliographic Details
Main Authors: Onuma, Naoki, Ikeda, Yukio, Mayeda, T.K., Clayton, R.N., Yanai, Keizo
Language:English
Published: 1983
Subjects:
Antarctic
The Antarctic
Antarc*
Memoirs of National Institute of Polar Research
Polar Research
Online Access:https://nipr.repo.nii.ac.jp/record/1568/files/KJ00000012201.pdf
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Summary:P(論文) Several inclusions from the Antarctic unequilibrated ordinary chondrites (ALH-764 (LL3), ALH-77015 (L3) and Y-790448 (L3)) were excavated and their petrography, chemical and oxygen isotopic compositions were determined. The coherent data indicates that precursors of the ordinary chondrites consist of a mixture of two different solid materials. One is a pre-existing solid enriched in albite component and depleted in ^<16>O component and the other is a solid depleted in albite component and enriched in ^<16>O component. The latter solid material may be an evaporation residue of the former solid material in an ambient gas. departmental bulletin paper

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