title: Superchondritic Nb/Ta and Zr/Hf ratios in peridotites and eclogites of the subcontinental lithospheric mantle: data from mantle xenoliths
metadata.name: dc.contributor.author
metadata.value: Nikitina, Larisa P.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Babushkina, Miriam S.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2019-08-28T12:25:55Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2019-08-28T12:25:55Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2019-06
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Nikitina, L. P., Babushkina, M. S. (2019). Superchondritic Nb/Ta and Zr/Hf ratios in peridotites and eclogites of the subcontinental lithospheric mantle: data from mantle xenoliths. Vestnik of Saint Petersburg University. Earth Sciences, 64 (2), 294–314.
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/spbu07.2019.208
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/16178
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The analysis of author’s and literary data on concentrations of Nb, Ta, Zr and Hf and on Nb/ Ta and Zr/Hf relations in eclogite and peridotite xenoliths from a subcontinental lithospheric mantle (SCLM) beneath Pcm cratons allowed us to establish the following: (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, Δ log f O2 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 to 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 the 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, and 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.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: Работа выполнена в рамках госбюджетных тем ИГГД РАН (№ 0153-2014-0002, 0153-2015-0008).
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: ru
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Vestnik of St Petersburg University. Earth Sciences;Volume 64; Issue 2
metadata.lang: -
metadata.name: dc.subject
metadata.value: subcontinental lithospheric mantle
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: peridotites
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: eclogites
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Nb, Ta, Zr и Hf fractionation
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Superchondritic Nb/Ta and Zr/Hf ratios in peridotites and eclogites of the subcontinental lithospheric mantle: data from mantle xenoliths
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 294-314.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/16178/1/294-314.pdf
resources.format: Adobe PDF
resources.size: 3,25 MB