The first finding of graphite inclusion in diamond from mantle rocks: The result of the study of eclogite xenolith from Udachnaya pipe (Siberian craton)
- Autores: Mikhailenko D.1, Korsakov A.1,2, Golovin A.1,2, Zelenovskiy P.3, Pohilenko N.1,2
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Afiliações:
- Sobolev Institute of Geology and Mineralogy, Siberian Branch
- Novosibirsk State University
- Institute of Natural Sciences
- Edição: Volume 469, Nº 2 (2016)
- Páginas: 870-873
- Seção: Geochemistry
- URL: https://journals.rcsi.science/1028-334X/article/view/188792
- DOI: https://doi.org/10.1134/S1028334X16080250
- ID: 188792
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Resumo
A xenolith of eclogite from the kimberlite pipe Udachnaya–East, Yakutia Grt+Cpx+Ky + S + Coe/Qtz + Dia + Gr has been studied. Graphite inclusions in diamond have been studied in detail by Confocal Raman (CR) mapping. The graphite inclusion in diamond has a highly ordered structure and is characterized by a substantial shift in the band (about 1580 cm–1) by 7 cm–1, indicating a significant residual strain in the inclusion. According to the results of FTIR spectroscopic studies of diamond crystals, a high degree of nitrogen aggregation has been detected: it is present mainly in form A, which means an “ancient” age of the diamonds. In the xenolith studied, the diamond formation occurred about 1 Byr, long before their transport by the kimberlite melt, and the conditions of the final equilibrium were temperatures of 1020 ± 40°C at 4.7 GPa. Thus, these graphite inclusions found in a diamond are the first evidence of crystallization of metastable graphite in a diamond stability field. They were formed in rocks of the upper mantle significantly below (≥20 km) the graphite-diamond equilibrium line.
Sobre autores
D. Mikhailenko
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Autor responsável pela correspondência
Email: pazilovdenis@igm.nsc.ru
Rússia, pr. Akad. Koptyuga 3, Novosibirsk, 119037
A. Korsakov
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: pazilovdenis@igm.nsc.ru
Rússia, pr. Akad. Koptyuga 3, Novosibirsk, 119037; Novosibirsk
A. Golovin
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: pazilovdenis@igm.nsc.ru
Rússia, pr. Akad. Koptyuga 3, Novosibirsk, 119037; Novosibirsk
P. Zelenovskiy
Institute of Natural Sciences
Email: pazilovdenis@igm.nsc.ru
Rússia, Yekaterinburg
N. Pohilenko
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: pazilovdenis@igm.nsc.ru
Rússia, pr. Akad. Koptyuga 3, Novosibirsk, 119037; Novosibirsk