Experimental modeling of the interaction of subducted carbonates and sulfur with mantle silicates


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Experimental studies in the system Fe,Ni–olivine–carbonate–S (P = 6.3 GPa, T = 1050–1550°C, t = 40–60 h) aimed at modeling of the interaction of subducted carbonates and sulfur with rocks of the silicate mantle and at investigation of the likely mechanism of the formation of mantle sulfides were performed. It is shown that an association of olivine + orthopyroxene + magnesite + pyrite coexisting with a sulfur melt/fluid with dissolved Fe, Ni, and O is formed at T ≤ 1250°C. An association of low-Fe olivine, orthopyroxene, and magnesite and two immiscible melts of the carbonate and S–Fe–Ni–O compositions are formed at T ≥ 1350°C. It is shown that the reduced S-bearing fluids may transform silicates and carbonates, extract metals from the solid-phase matrix, and provide conditions for generation of sulfide melts.

作者简介

Yu. Bataleva

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

编辑信件的主要联系方式.
Email: bataleva@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

Yu. Palyanov

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: bataleva@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

Yu. Borzdov

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: bataleva@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

E. Zdrokov

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: bataleva@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

N. Sobolev

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: bataleva@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

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