NONCHONDRITIC PT/PD RATIOS IN ARC MANTLE XENOLITHS: EVIDENCE FOR PLATINUM ENRICHMENT IN DEPLETED ISLAND-ARC MANTLE SOURCES
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dc.contributor.author | Kepezhinskas P. | |
dc.contributor.author | Defant M.J. | |
dc.date.accessioned | 2021-04-10T08:10:59Z | |
dc.date.available | 2021-04-10T08:10:59Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=41904493 | |
dc.identifier.citation | Geology, 2001, 29, 9, 851-854 | |
dc.identifier.issn | 0091-7613 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27628 | |
dc.description.abstract | Mantle-derived spinel harzburgites from the Kamchatka arc have fractionated Pd- group element patterns, and Pt is clearly enriched relative to Pd and Rh. This fractionation is also consistent with chondritic Ir-group platinum-group element distribution and super- chondritic Pt/Pd, chondrite-normalized (Pt/Os)N and (Pt/Ir)N found in harzburgite xenoliths from the Tubaf seamount in the Lihir island group of the Tabar-Lihir-Tanga-Feni island arc in Papua New Guinea. The nonchondritic Pt/Pd ratios and Pt enrichment in the island-arc mantle are best explained by extraction of melt in a back-arc volcanic-arc setting, which left refractory Pt-Fe alloys in the residual mantle. Pt-Fe alloys selectively concentrate Pt relative to Pd and, overall, increase the Pt/Pd in a subarc mantle wedge. Partial melting of this Pt-enriched mantle wedge above the subduction zone, due to hydrous flux from the subducting lithosphere, is potentially capable of producing Pt-rich primitive melts parental to the Alaskan-type ultramafic-mafic complexes. | |
dc.title | NONCHONDRITIC PT/PD RATIOS IN ARC MANTLE XENOLITHS: EVIDENCE FOR PLATINUM ENRICHMENT IN DEPLETED ISLAND-ARC MANTLE SOURCES | |
dc.type | Статья |
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