RE-OS ISOTOPE SYSTEMATICS AND PLATINUM GROUP ELEMENT FRACTIONATION DURING MANTLE MELT EXTRACTION: A STUDY OF MASSIF AND XENOLITH PERIDOTITE SUITES
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dc.contributor.author | Pearson D.G. | |
dc.contributor.author | Irvine G.J. | |
dc.contributor.author | Ionov D.A. | |
dc.contributor.author | Boyd F.R. | |
dc.contributor.author | Dreibus G.E. | |
dc.date.accessioned | 2022-04-04T07:16:57Z | |
dc.date.available | 2022-04-04T07:16:57Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13871018 | |
dc.identifier.citation | Chemical Geology, 2004, 208, 1-4, 29-59 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36874 | |
dc.description.abstract | Re–Os isotope and platinum group elements (PGE) systematics are presented for peridotite xenoliths from N. Lesotho (on-craton), S. Namibia (circum-cratonic), the Vitim volcanic field (Baikhal Rift), plus massif peridotites from Beni Bousera, N. Morocco. Mg–Fe variations indicate that these samples have experienced between 5% (Vitim–Beni Bousera) and 50% (Lesotho) melt extraction, providing the opportunity to examine PGE fractionation over a large melting interval. The Namibian xenoliths and Beni Bousera massif peridotites show no variation of iridium group (Ir, Ru, Os; I-PGE) abundances or inter-element fractionations relative to melt depletion indices such as Mg number or Al2O3. Lesotho peridotites show large variations in I-PGE abundances (Os range 0.2–13 ppb) at relatively constant Al2O3 that are not easily rationalised by melt-extraction models. Despite these abundance variations, there is no significant inter-element fractionation of I-PGE, e.g., (Os/Ir)n, showing that these elements are not fractionated by even very large degrees of melting (up to 50% melt extraction). Lesotho peridotites are amongst the most P-PGE (Pt, Pd)-depleted mantle rocks, with highly fractionated chondrite-normalised PGE. PGE systematics for all these peridotite suites allow a relative order of PGE compatibility to be firmly established for mantle melting: | |
dc.title | RE-OS ISOTOPE SYSTEMATICS AND PLATINUM GROUP ELEMENT FRACTIONATION DURING MANTLE MELT EXTRACTION: A STUDY OF MASSIF AND XENOLITH PERIDOTITE SUITES | |
dc.type | Статья |
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