OXYGEN ISOTOPE EVIDENCE REGARDING THE FORMATION OF SPINEL-BEARING CHONDRULES
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dc.contributor.author | Maruyama S. | |
dc.contributor.author | Yurimoto H. | |
dc.contributor.author | Sueno S. | |
dc.date.accessioned | 2021-01-09T03:54:52Z | |
dc.date.available | 2021-01-09T03:54:52Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=129931 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1999, , 1, 165-171 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/22408 | |
dc.description.abstract | Oxygen isotope compositions of individual mineral grains in two spinel-bearing chondrules have been determined by secondary ion mass spectrometry. O isotope ratios of spinel grains in a plagioclase-rich chondrule were extremely 16O-rich (δ18O ~ δ17O ~ -35%%) indicating close relationship to spinels in Ca-Al-rich inclusions (CAIs), whereas O isotope ratios of a spinel grain in barred-olivine chondrule were less enriched in 16O (δ18O ~ δ17O ~ -10%%). The degree of 16O-excesses among minerals within each chondrule was parallel to the crystallization sequences. These measurements suggest that some CAI-spinel grains were incorporated into the chondrule precursors, and that the O isotopic variation among minerals may result in incomplete exchange of O isotopes between 16O-rich chondrule melt and 16O-poor ambient nebular gas. The mesostasis having an O-isotopic composition near the terrestrial fractionation line may have been somewhat affected by the aqueous alteration in the parent body. | |
dc.subject | METEORITES | |
dc.subject | CHONDRULES | |
dc.subject | CALCIUM-ALUMINIUM INCLUSIONS | |
dc.subject | SPINEL GROUP | |
dc.subject | OXYGEN | |
dc.subject | ISOTOPES | |
dc.subject | SECONDARY ION MASS SPECTROSCOPY | |
dc.title | OXYGEN ISOTOPE EVIDENCE REGARDING THE FORMATION OF SPINEL-BEARING CHONDRULES | |
dc.type | Статья |
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