OXYGEN-ISOTOPIC COMPOSITIONS OF RELICT AND HOST GRAINS IN CHONDRULES IN THE YAMATO 81020 CO3.0 CHONDRITE
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Kunihiro T. | |
dc.contributor.author | Rubin A.E. | |
dc.contributor.author | McKeegan K.D. | |
dc.contributor.author | Wasson J.T. | |
dc.date.accessioned | 2022-03-21T07:44:12Z | |
dc.date.available | 2022-03-21T07:44:12Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=12090485 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2004, 68, 17, 3599-3606 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36478 | |
dc.description.abstract | We report the oxygen-isotope compositions of relict and host olivine grains in six high-FeO porphyritic olivine chondrules in one of the most primitive carbonaceous chondrites, CO3.0 Yamato 81020. Because the relict grains predate the host phenocrysts, microscale in situ analyses of O-isotope compositions can help assess the degree of heterogeneity among chondrule precursors and constrain the nebular processes that caused these isotopic differences. In five of six chondrules studied, the Δ17O (=δ17O −0.52 · δ18O) compositions of host phenocrysts are higher than those in low-FeO relict grains; the one exception is for a chondrule with a moderately high-FeO relict. Both the fayalite compositions as well as the O-isotope data support the view that the low-FeO relict grains formed in a previous generation of low-FeO porphyritic chondrules that were subsequently fragmented. It appears that most low-FeO porphyritic chondrules formed earlier than most high-FeO porphyritic chondrules, although there were probably some low-FeO chondrules that formed during the period when most high-FeO chondrules were forming. | |
dc.title | OXYGEN-ISOTOPIC COMPOSITIONS OF RELICT AND HOST GRAINS IN CHONDRULES IN THE YAMATO 81020 CO3.0 CHONDRITE | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru