Abstract
Sulfide-bearing polymineralic inclusions in mantle-derived chromium pyrope garnets of lherzolite paragenesis from lamprophyres of the Chompolo field (Aldan shield, southern Siberian craton) have been studied. The inclusions are composed of either only sulfides or sulfides in association with other minerals (carbonates, silicates, oxides, etc.). The sulfide part of the inclusions is represented by up to four minerals. Among the sulfides, minerals rich in Cu and Ni have been found, whereas Fe sulfides (pyrrhotite, troilite) are absent. This distinguishes the inclusions studied from the majority of sulfide inclusions in mantle minerals and diamonds, as well as in mantle xenoliths from kimberlites. The formation of polymineralic inclusions in chromium garnets of the Chompolo field is attributed to the effect of a carbonate–silicate metasomatic melt/fluid on mantle peridotites, as evidenced by the mineral suite associated with the sulfides. The research results indicate significant differences in the nature of metasomatic processes that occurred in the lithospheric mantle of the southern and central parts of the Siberian craton.
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Funding
Analytical studies were supported by the Russian Science Foundation, project no. 18-77-10062 (SEM, EPMA, RS) and no. 18-17-00249 (LA-ICP-MS). Field work and sampling were supported by a State Assignment of the Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences. Handpicking of garnet samples with mineral inclusions was supported by the President of the Russian Federation, grant no. МК-971.2020.5.
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Translated by M.S. Nickolsky
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Nikolenko, E.I., Sharygin, I.S., Rezvukhin, D.I. et al. Sulfide-Bearing Polymineralic Inclusions in Mantle-Derived Garnets from Lamprophyres of the Chompolo Field (Central Aldan, Siberian Craton). Dokl. Earth Sc. 497, 300–304 (2021). https://doi.org/10.1134/S1028334X21040115
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DOI: https://doi.org/10.1134/S1028334X21040115