MINERAL CHEMISTRY OF A ZIRCON-BEARING, COMPOSITE, VEINED AND METASOMATISED UPPER-MANTLE PERIDOTITE XENOLITH FROM KIMBERLITE

dc.contributor.author	Dawson J.B.
dc.contributor.author	Hill P.G.
dc.contributor.author	Kinny P.D.
dc.date.accessioned	2021-03-06T03:56:46Z
dc.date.available	2021-03-06T03:56:46Z
dc.date.issued	2001
dc.identifier	https://elibrary.ru/item.asp?id=13873563
dc.identifier.citation	Contributions to Mineralogy and Petrology, 2001, 140, 6, 720-733
dc.identifier.issn	0010-7999
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/26391
dc.description.abstract	Zircon-bearing veins in a harzburgite xenolith from kimberlite have imposed Ca-metasomatism on the harzburgite wall rock, in addition to adding K, Fe, Ti and OH. The zircon, previously dated to have an age similar to that of the xenolith-hosting kimberlite, shows higher Y, Nb, Ba, REE, Th and U contents than other mantle-derived zircons. Peripheral alteration of the zircon to baddeleyite and zirconolite, and alteration of vein ilmenite to perovskite suggest reaction with an evolving carbonatitic kimberlite melt. The high Cr2O3 content (0.77 wt%) of the zirconolite extends the compositional range of terrestrial zirconolite.
dc.title	MINERAL CHEMISTRY OF A ZIRCON-BEARING, COMPOSITE, VEINED AND METASOMATISED UPPER-MANTLE PERIDOTITE XENOLITH FROM KIMBERLITE
dc.type	Статья

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