Суперхондритовые Nb/Ta и Zr/Hf отношения в перидотитах и эклогитах субконтинентальной литосферной мантии: данные мантийных ксенолитов

Лариса Петровна Никитина; Мирьям Самуиловна Бабушкина

doi:10.21638/spbu07.2019.208

Authors

Лариса Петровна Никитина Institute of Precambrian geology and geochronology RAS, 2 Makarova Emb., St. Petersburg, 199034, Russian Federation
Мирьям Самуиловна Бабушкина Institute of Precambrian geology and geochronology RAS, 2 Makarova Emb., St. Petersburg, 199034, Russian Federation

DOI:

https://doi.org/10.21638/spbu07.2019.208

Abstract

The analysis of author’s and literary data on concentrations of Nb, Ta, Zr and Hf and relations Nb/Ta and Zr/Hf in eclogite and peridotite xenoliths from a subcontinental lithospheric mantle (SCLM) beneath Pcm cratons allowed to establish: (1) xenoliths of mantle peridotites from the kimberlites of Kaapvaal, North-American and Siberian cratons (temperature from 900-1000 to 1350-1400°C, pressure from 1.5-2.0 to 5-6 GPa, DlogfO₂^FMQ from -5 to -3) are enriched with Nb and Ta relative to chondrite CI and primitive mantle PM, whereas peridotites from the mantle of the North-China craton are close to CI in their content or depleted in comparison with it; (2) despite significant fluctuations, superhondritic values of Nb/Ta (> 17.4) and Zr/Hf (> 36.0) are characteristic of most peridotite xenoliths from the subcratonic mantle, with exception of North- China craton mantle xenoliths, where they are close to or below CI; (3) in the xenoliths of eclogites from the mantle of the Kasai, Man, Slave cratons (temperature from 900-1000 to 1400-1500°C, pressure from 3 to 5-6 GPa), the content of Nb is 2-3 orders of magnitude higher than those in CI and PM, the ratio of Nb/Ta ranges from chondritic to superchondritic values. The results of the analysis thus indicate that the SCLM zones corresponding to the area of diamond stability, are one of the tanks in BSE with superchondritic Nb/Ta and Zr/Hf values.

Keywords:

subcontinental lithospheric mantle, peridotites, eclogites, Nb, Ta, Zr и Hf fractionation

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References

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