THE XENOLITHS OF GRANULITE-ECLOGITE GROUP FROM ALKALINE ULTRAMAFIC DYKES AND PIPES OF THE KANDALAKSHA GRABEN

dc.contributor.author	Kortshkova M.Yu.
dc.date.accessioned	2021-01-06T07:51:19Z
dc.date.available	2021-01-06T07:51:19Z
dc.date.issued	1998
dc.identifier	https://elibrary.ru/item.asp?id=31848377
dc.identifier.citation	Вестник Санкт-Петербургского университета. Серия 7. Геология. География, 1998, , 1, 69-XIV
dc.identifier.issn	1029-7456
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/22296
dc.description.abstract	According to estimated temperatures and pressures (700-860°C, 13-20 kb) the xenoliths of the grabuliteeclogite group from alkaline ultramafic dykes and pipes of the Kandalaksha graben come from the low crust. The mineral chemistry of the xenoliths depends on both the bulk rock composition and the PT-equilibrium conditions. There are systematic changes in the mineral compositions when garnet-free websterites and granulites turn to Gr-websterites and further to eclogites. The chemistry and geochemistry of the rocks evidence that the granulite-eclogite xenoliths group is heterogeneous. Ancient crust material exhausted with partial melting, ancient subducted oceanic crust, and basalt underplating could be the sources of the xenoliths.
dc.title	THE XENOLITHS OF GRANULITE-ECLOGITE GROUP FROM ALKALINE ULTRAMAFIC DYKES AND PIPES OF THE KANDALAKSHA GRABEN
dc.type	Статья

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