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Hg- and Cd-Bearing Pd, Pt, Au, and Ag Minerals in Sulfide-Bearing Mafic and Ultramafic Rocks of the Yoko-Dovyren Intrusion in the Baikalides of the Northern Baikal Area

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Abstract

Hg and Cd are rare chemical elements found in magmatic PGE and Au mineralization and typical of this mineralization in the Late Riphean Yoko-Dovyren plagioperidotite–troctolite–gabbronorite intrusion hosted in the Baikalides of the Baikal area. The paper discusses variations in the composition, associations, and distribution traits of the Hg- and Cd-bearing Pt, Pd, Au, and Ag minerals. Many of the precious-metal minerals are Pt, Pd, and Au chalcogenides and intermetallic compounds of postmagmatic genesis and occur as single crystals and stringers in sulfides and silicate matrix and at their contacts. The minerals were formed with the participation of fluids from the crystallizing Fe–Cu–Ni sulfide melts. They are constrained to the central part of the intrusion and found in sulfide-bearing plagiolherzolite (PL) in the lower part of the intrusion, in sulfide-bearing pegmatoid troctolite (T) in the bottom portion of the troctolite unit, and in sulfide-bearing pegmatoid anorthosite (A) in the top part of the troctolite unit. From PL to T and further to A, the content and diversity of the Hg-bearing minerals remarkably increase, with Hg distributed in these minerals very unevenly, and with Cd-bearing minerals identified only in A. The leading Hg concentrators in T and A are pneumatolytic (fluid–metasomatic) moncheite and, particularly, later telargpalite (Pd,Ag)3(Te,Pd,Hg), which contains up to 11 wt % Hg. The latter mineral is sometimes found in association with Hg-electrum, kustelite, and potarite. Potarite in T is Pb-rich, and this mineral in A is Pb-free. Appreciable Hg concentrations in precious-metal minerals in the Yoko-Dovyren intrusion suggest that these minerals crystallized in a closed system at high temperatures. Potarite content in A is much higher, and Hg concentration in telargpalite in A is notably lower (2.9 wt % Hg on average) than in this mineral in T (5.9 wt % Hg on average). The potarite might have been produced by epigenetic serpentinization processes (low-grade metamorphism) at the expense of the material of pneumatolytic Hg-bearing telatgpalite, kotulskite, and zvyagentsivite. This corresponds to specifics in Hg distribution in the telatgpalite, kotulskite, and zvyagentsivite in T and A and much higher intensity of metamorphism.

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ACKNOWLEDGMENTS

This study was supported by Russian Science Foundation (Grant 16-17-10129) and was conducted using equipment purchased under the Development Program for the Lomonosov Moscow State University.

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Correspondence to E. M. Spiridonov.

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Translated by E. Kurdyukov

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Spiridonov, E.M., Orsoev, D.A., Ariskin, A.A. et al. Hg- and Cd-Bearing Pd, Pt, Au, and Ag Minerals in Sulfide-Bearing Mafic and Ultramafic Rocks of the Yoko-Dovyren Intrusion in the Baikalides of the Northern Baikal Area. Geochem. Int. 57, 42–55 (2019). https://doi.org/10.1134/S0016702919010105

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