PRESOLAR SPINEL GRAINS FROM THE MURRAY AND MURCHISON CARBONACEOUS CHONDRITES
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dc.contributor.author | Zinner E. | |
dc.contributor.author | Amari S. | |
dc.contributor.author | Guinness R. | |
dc.contributor.author | Nguyen A. | |
dc.contributor.author | Stadermann F.J. | |
dc.contributor.author | Walker R.M. | |
dc.contributor.author | Lewis R.S. | |
dc.date.accessioned | 2022-01-01T05:41:02Z | |
dc.date.available | 2022-01-01T05:41:02Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=5189016 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2003, 67, 24, 5083-5095 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33994 | |
dc.description.abstract | With a new type of ion microprobe, the NanoSIMS, we determined the oxygen isotopic compositions of small (<1μm) oxide grains in chemical separates from two CM2 carbonaceous meteorites, Murray and Murchison. Among 628 grains from Murray separate CF (mean diameter 0.15 μm) we discovered 15 presolar spinel and 3 presolar corundum grains, among 753 grains from Murray separate CG (mean diameter 0.45 μm) 9 presolar spinel grains, and among 473 grains from Murchison separate KIE (mean diameter 0.5 μm) 2 presolar spinel and 4 presolar corundum grains. The abundance of presolar spinel is highest (2.4%) in the smallest size fraction. The total abundance in the whole meteorite is at least 1 ppm, which makes spinel the third-most abundant presolar grain species after nanodiamonds (if indeed a significant fraction of them are presolar) and silicon carbide. The O-isotopic distribution of the spinel grains is very similar to that of presolar corundum, the only statistically significant difference being that there is a larger fraction of corundum grains with large 17O excesses (17O/16O > 1.5 x 10-3), which indicates parent stars with masses between 1.8 and 4.5 M#. | |
dc.title | PRESOLAR SPINEL GRAINS FROM THE MURRAY AND MURCHISON CARBONACEOUS CHONDRITES | |
dc.type | Статья |
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