PYROXENITE XENOLITHS IN PICRITE BASALTS (VITIM PLATEAU): ORIGIN AND DIFFERENTIATION OF MANTLE MELTS
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dc.contributor.author | Ashchepkov I.V. | |
dc.contributor.author | André L. | |
dc.date.accessioned | 2021-07-20T07:47:15Z | |
dc.date.available | 2021-07-20T07:47:15Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=14996566 | |
dc.identifier.citation | Geologiya i geofizika, 2002, 43, 4, 343-363 | |
dc.identifier.issn | 0016-7886 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/29776 | |
dc.description.abstract | The petrography and major- and trace-element chemistry of pyroxenite xenoliths from Miocene picrite basalts of the Vitim plateau suggest an origin by polybaric fractional crystallization of mantle melts. High-temperature giant-grained black pyroxenites and clinopyroxene megacrysts make a long trend (Fe# = 0.12 to 0.23%) corresponding to polybaric Cpx-Ga cotectic fractionation, possibly, associated with formation of a pre-eruption vein system. Low-temperature black pyroxenites are products of interaction of residual melts with the lower crust material. High-temperature hybrid websterites may have been produced by mixing of basaltic melts with fused (<5–10% partial melting) metasomatic mantle lherzolites or by AFC processes with Ga-Cpx dissolution. Anatectic Cr pyroxenites were formed mostly by segregation of partial melts from lherzolite material and remelting of former veins. Low-temperature hybrid garnet pyroxenites result from interaction of metasomatic lherzolites (or earlier Cr-diopside veins) with volatile-enriched differentiated basaltic melt. Remelting of earlier mineral generations, which occurs in all rising melt systems, is reflected by mirror-like peaks on spidergrams, spikes on TRE diagrams, and LREE and HFSE (and ore element) enrichment. | |
dc.subject | Megacryst | |
dc.subject | basalt | |
dc.subject | clinopyroxene | |
dc.subject | garnet | |
dc.subject | ilmenite | |
dc.subject | mantle | |
dc.subject | melt | |
dc.subject | fractional crystallization | |
dc.subject | partition coefficients | |
dc.subject | melting | |
dc.subject | assimilation | |
dc.subject | inductively coupled plasma | |
dc.title | PYROXENITE XENOLITHS IN PICRITE BASALTS (VITIM PLATEAU): ORIGIN AND DIFFERENTIATION OF MANTLE MELTS | |
dc.type | Статья |
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