Zircon trace element characteristics and ages in granulite xenoliths: a key to understanding the age and origin of the lower crust, Arkhangelsk kimberlite province, Russia

M.Y. Koreshkova, H. Downes, V.A. Glebovitsky, N.V. Rodionov, A.V. Antonov, S.A. Sergeev

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

9 Цитирования (Scopus)

Аннотация

Garnet granulite and pyroxenite xenoliths from the Grib kimberlite pipe (Arkhangelsk, NW Russia) represent the lower crust beneath Russian platform in close vicinity to the cratonic region of the north-eastern Baltic (Fennoscandian) Shield. Many of the xenoliths have experienced strong interaction with the kimberlite host, but in others some primary granulite-facies minerals are preserved. Calculated bulk compositions for the granulites suggest that their protoliths were basic to intermediate igneous rocks; pyroxenites were ultrabasic to basic cumulates. A few samples are probably metasedimentary in origin. Zircons are abundant in the xenoliths; they exhibit complex zoning in cathodoluminescence with relic cores and various metamorphic rims. Cores include oscillatory zircon crystallized in magmatic protoliths, and metamorphic and magmatic sector-zoned zircons. Recrystallization of older zircons led to the formation of bright homogeneous rims. In some samples, homogeneous shells are surrounded by darker convol
Язык оригиналаанглийский
Номер статьи973
Число страниц22
ЖурналContributions of Mineralogy and Petrology
Том167
Номер выпуска2
DOI
СостояниеОпубликовано - 2014

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