MN-CR ISOTOPE SYSTEMATICS OF THE D'ORBIGNY ANGRITE
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dc.contributor.author | Glavin D.P. | |
dc.contributor.author | Kubny A. | |
dc.contributor.author | Jagoutz E. | |
dc.contributor.author | Lugmair G.W. | |
dc.date.accessioned | 2022-10-27T10:15:46Z | |
dc.date.available | 2022-10-27T10:15:46Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=28255657 | |
dc.identifier.citation | Meteoritics and Planetary Science, 2004, 39, 5, 693-700 | |
dc.identifier.issn | 1086-9379 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39205 | |
dc.description.abstract | We have conducted a detailed study of the Mn-Cr systematics of the angrite D'Orbigny. Here, we report Cr isotopic abundances and Mn/Cr ratios in olivine, pyroxene, glass, chromite, and bulk rock samples from D'Orbigny. 53Cr excesses in these samples correlate well with their respective Mn/Cr ratios and define an isochron with a slope that corresponds to an initial 53Mn/55Mn ratio = (3.24 ± 0.04) - 10-6 and initial 53Cr/52Cr ratio of e(53) = 0.30 ± 0.03 at the time of isotopic closure. The 53Mn/55Mn ratio of the D'Orbigny bulk rock is more than two-fold the 53Mn/55Mn ratio of the angrites Lewis Cliff 86010 (LEW) and Angra dos Reis (ADOR) and implies an older Mn-Cr age of 4562.9 ± 0.6 Ma for D'Orbigny relative to a Pb-Pb age of 4557.8 ± 0.5 Ma for LEW and ADOR. One of the most unusual aspects of D'Orbigny is the presence of glass, a phase that has not been identified in any of the other angrites. The Mn-Cr data for glass and a pyroxene fraction found in druses indicate that they formed contemporaneously with the main phases of the meteorite. Since the Mn-Cr age of D'Orbigny is ~5 Ma years older than the angrites LEW and ADOR, D'Orbigny likely represents an earlier stage in the evolution of the angrite parent body. | |
dc.title | MN-CR ISOTOPE SYSTEMATICS OF THE D'ORBIGNY ANGRITE | |
dc.type | Статья |
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