OXYGEN ISOTOPE COMPOSITION OF GARNET AND SPINEL PERIDOTITES IN THE CONTINENTAL MANTLE: EVIDENCE FROM THE VITIM XENOLITH SUITE, SOUTHERN SIBERIA
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dc.contributor.author | Ionov D.A. | |
dc.contributor.author | Harmon R.S. | |
dc.contributor.author | Greenwood P.B. | |
dc.contributor.author | France-Lanord C. | |
dc.contributor.author | Ashchepkov I.V. | |
dc.date.accessioned | 2020-12-03T08:41:37Z | |
dc.date.available | 2020-12-03T08:41:37Z | |
dc.date.issued | 1994 | |
dc.identifier | https://elibrary.ru/item.asp?id=31101546 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1994, , 5, 1463-1470 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20321 | |
dc.description.abstract | Spinel and garnet fades peridotites from the Vitim Volcanic Field in Siberia comprise a suite of fertile mantle xenoliths, which are LREE depleted and have strongly depleted strontium and neodymium isotopic compositions. Determination of ratios by conventional and laser-assisted fluorination techniques yield a very restricted range of whole-rock δ¹⁸O values for both spinel peridotites (+ 5.4 to + 5.8‰) and garnet lherzolites (+ 5.5 to + 5.8‰) equivalent to that observed for lunar rocks and midocean ridge basalts (MORB). Mineral δ18O values for the xenoliths are: olivine = + 5.1 to + 5.8%., orthopyroxene = + 5.7 to + 6.0%., clinopyroxene = + 5.5 to + 6.2%., garnet = + 5.5 to +6.0%., and spinel = + 4.9 to + 5.5%. Similarly, δ18O ranges for silicate mineral pairs vary from only 0.5 to 0.7%. The sixteen peridotite xenoliths studied exhibit equilibrium O-isotope fractionations between minerals of a magnitude expected from theoretical and experimental considerations, in particular a temperature-controlled 18O distribution between olivine and pyroxenes in spinel-bearing peridotites. | |
dc.title | OXYGEN ISOTOPE COMPOSITION OF GARNET AND SPINEL PERIDOTITES IN THE CONTINENTAL MANTLE: EVIDENCE FROM THE VITIM XENOLITH SUITE, SOUTHERN SIBERIA | |
dc.type | Статья |
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