18O/16O ratios in anhydrous spinel lherzolite xenoliths from the Shavaryn-Tsaram volcano, Mongolia

dc.contributor.author	Kovalenko V.I.
dc.contributor.author	Harmon R.S.
dc.contributor.author	Kempton P.D.
dc.contributor.author	Stosch H.G.
dc.contributor.author	Hoefs J.
dc.contributor.author	Eonov D.
dc.date.accessioned	2020-04-16T11:04:19Z
dc.date.available	2020-04-16T11:04:19Z
dc.date.issued	1987
dc.identifier	https://elibrary.ru/item.asp?id=31145333
dc.identifier.citation	EARTH AND PLANETARY SCIENCE LETTERS, 1987, 81, 2-3, 193-202
dc.identifier.issn	0012-821X
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/16887
dc.description.abstract	Anhydrous spinel lherzolite xenoliths from the Shavaryn-Tsaram volcano, which represent unusually clinopyroxenerich samples of upper mantle beneath the Tariat Depression in north-central Mongolia, have particularly low δ18O values of +4.9 to +5.7‰ SMOW. Constituent minerals exhibit small (ca. 0.5–0.7‰) variations in18O content (olivine = +4.6 to +5.3‰, clinopyroxene = +5.6 to +6.1‰, orthopyroxene = +5.8 to +6.5‰), that are unrelated to xenolith modal mineralogy, chemical composition, radiogenic isotope character, or pyroxene equilibration temperature. This O-isotope character of the Tariat xenoliths is interpreted to reflect the closed-system distribution of oxygen isotopes in a slowly cooling mantle diapir emplaced into the lithosphere from a relatively primitive region of the asthenosphere.
dc.title	18O/16O ratios in anhydrous spinel lherzolite xenoliths from the Shavaryn-Tsaram volcano, Mongolia
dc.type	Статья

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