Инд. авторы: Shatsky V.S., Zedgenizov D.A., Ragozin A.L.
Заглавие: Evidence for a subduction component in the diamond-bearing mantle of the Siberian craton
Библ. ссылка: Shatsky V.S., Zedgenizov D.A., Ragozin A.L. Evidence for a subduction component in the diamond-bearing mantle of the Siberian craton // Russian Geology and Geophysics. - 2016. - Vol.57. - Iss. 1. - P.111-126. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы: DOI: 10.1016/j.rgg.2016.01.008; РИНЦ: 26857106; SCOPUS: 2-s2.0-84958660748; WoS: 000369723900009;
Реферат: eng: Evidence for the involvement of a subduction component in diamond formation is analyzed based on literature data and our studies. Examination of xenoliths of diamondiferous eclogites, including X-ray tomography analysis, testifies to the superposed character of most diamonds. Diamond generation is accompanied by the serious modification of eclogite substratum. Isotope-geochemical data show that the eclogites originated from oceanic-crust rocks. The oxygen isotope compositions of garnets and clinopyroxenes from websterite xenoliths are similar to the mantle average (5.3-5.6 parts per thousand). The eclogite minerals vary considerably in oxygen isotope composition (delta O-18 of 5.3 to 12.4 parts per thousand). Diamonds of eclogitic paragenesis predominate dramatically in the placers of the northeastern Yakutian diamondiferous province. In placer eclogitic diamonds, delta C-13 varies from -27.2 to -3 parts per thousand (n = 28). In diamonds of ultrabasic paragenesis, the range of delta C-13 values is much narrower (from -7.1 to -0.5 parts per thousand). All diamonds of variety V have a lighter carbon isotope composition (from -24.1 to -17.4 parts per thousand). In a wide range of crystals with a contrasting carbon isotope composition, the isotope composition of the rim tends toward the average mantle value. This suggests that the eclogitic diamonds grew first with the participation of carbon from subducted continental crust and finally with the involvement of mantle carbon. (C) 2016, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
Ключевые слова: websterites; diamond; upper mantle; UDACHNAYA KIMBERLITE PIPE; OXYGEN-ISOTOPE COMPOSITION; ROBERTS-VICTOR ECLOGITES; OCEANIC-CRUST; SOUTH-AFRICA; KOKCHETAV MASSIF; TRACE-ELEMENT; MINERAL INCLUSIONS; STABLE-ISOTOPES; HIGH-PRESSURE ROCKS; eclogites;
Издано: 2016
Физ. характеристика: с.111-126
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