Formation of chondrules in a moderately high dust enriched disk: evidence from oxygen isotopes of chondrules from the Kaba CV3 chondrite.

ABSTRACT: Oxygen three-isotope analysis by secondary ion mass spectrometry of chondrule olivine and pyroxene in combination with electron microprobe analysis were carried out to investigate 24 FeO-poor (type I) and 2 FeO-rich (type II) chondrules from the Kaba (CV) chondrite. The Mg#'s of olivine and pyroxene in individual chondrules are uniform, which confirms that Kaba is one of the least thermally metamorphosed CV3 chondrites. The majority of chondrules in Kaba contain olivine and pyroxene that show indistinguishable Δ¹⁷O values (= δ¹⁷O - 0.52 × δ¹⁸O) within analytical uncertainties, as revealed by multiple spot analyses of individual chondrules. One third of chondrules contain olivine relict grains that are either ¹⁶O-rich or ¹⁶O-poor relati

SUBMITTER: Hertwig AT 

PROVIDER: S-EPMC6350813 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature