- Tytuł:
- Oxygen-isotopic compositions of minerals from the Baszkówka chondrite
- Autorzy:
- Maruyama, S.
- Powiązania:
- https://bibliotekanauki.pl/articles/2059312.pdf
- Data publikacji:
- 2001
- Wydawca:
- Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
- Tematy:
-
Baszkówka
meteorites
ordinary chondrites
chondrules
spinel
oxygen isotopes - Opis:
- Oxygen isotopic compositions of two picotite-bearing chondrules from Baszkówka L5(S1) equilibrated ordinary chondrite have been determined by secondary ion mass spectrometry. The O-isotopic compositions of the minerals in the picotite-bearing chondrules are slightly more 16O-rich than the bulk O-isotopic composition of Baszkówka. The petrological properties and the O-isotopic compositions of these chondrules suggest that they have closer relationship to ferromagnesian chondrules than CAIs. The 16O-enrichment of the picotite-bearing chondrules may result from incomplete O exchange reaction between 16O-rich chondrule precursors and the 16O-poor solar nebular gas. This implies that the picotite-bearing chondrules are more primitive than ordinary ferromagnesian chondrules in Baszkówka. The O-isotopic compositions of the minerals in one of these chondrules relate to the crystallization sequence. These O-isotopic variations of minerals within the chondrule may result from incomplete O exchange between the chondrule melt droplet and the nebular gas. The heterogeneity of the O-isotopic composition in Baszkówka indicates that Baszkówka has not been homogenized completely during thermal metamorphism and/or secondary alteration.
- Źródło:
-
Geological Quarterly; 2001, 45, 3; 303-312
1641-7291 - Pojawia się w:
- Geological Quarterly
- Dostawca treści:
- Biblioteka Nauki
Artykuł