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

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 pe...

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Bibliographic Details
Published in:Doklady earth sciences 2016-09, Vol.470 (1), p.953-956
Main Authors: Bataleva, Yu. V., Palyanov, Yu. N., Borzdov, Yu. M., Zdrokov, E. V., Sobolev, N. V.
Format: Article
Language:English
Subjects:
Carbonates
Earth and Environmental Science
Earth Sciences
Geochemistry
Mathematical models
Plate tectonics
Pyrite
Silicates
Sulfides
Sulfur
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Summary: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.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X16090105