OSMIUM ISOTOPIC COMPOSITIONS OF MANTLE XENOLITHS: A GLOBAL PERSPECTIVE
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dc.contributor.author | Meisel T. | |
dc.contributor.author | Walker R.J. | |
dc.contributor.author | Irving A.J. | |
dc.contributor.author | Lorand J.P. | |
dc.date.accessioned | 2021-04-09T02:56:42Z | |
dc.date.available | 2021-04-09T02:56:42Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=32120442 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2001, 65, 8, 1311-1323 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27594 | |
dc.description.abstract | The Re-Os isotopic systematics of spinel- and garnet-bearing mantle xenoliths from North and Central America, Europe, southern Africa, Asia, and the Pacific region were determined to define more precisely the isotopic composition of a hypothetical primitive upper mantle (PUM). When plotted against Al2O3 or other melt depletion indicators, the 187Os/188Os ratios of all xenolith suites display positive trends toward a uniform composition at a fertile mantle composition. A 187Os/188Os value for PUM of 0.1296 ± 0.0008 (level of confidence 95%) was defined on the basis of 117 spinel-bearing xenoliths from this work and data from the literature, including data for massif peridotites. The 187Os/188Os ratio of the PUM is similar to the range of compositions defined by ordinary and enstatite chondrites, not carbonaceous chondrites. Spinel-bearing mantle peridotites sampled by volcanism and peridotite massifs appear to have been extracted from a common fertile source (PUM) between 1 and 2 Ga ago. These peridotites now form part of the subcontinental lithospheric mantle underlying continental crust of similar or greater formation age. | |
dc.title | OSMIUM ISOTOPIC COMPOSITIONS OF MANTLE XENOLITHS: A GLOBAL PERSPECTIVE | |
dc.type | Статья |
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