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Fülöppite Pb3Sb8S15 from the Darasun Volcanogenic–Plutonogenic Gold Deposit (Eastern Transbaikalia)

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Abstract

The Late Jurassic orogenic volcanogenic–plutonogenic Darasun gold deposit (the Eastern Transbaikalian segment of the Mongolia-Okhotsk Foldbelt) includes post-gold antimony mineralization. Aggregates of rice-like quartz, minerals of the jordanite–geocronite–schulzite series, sphalerite, galena, arsenopyrite, tennantite–tetrahedrite, calcite, and Mn–Mg siderite are its earlier formations; the later ones include rice-like quartz, low-iron sphalerite, Pb–Sb sulphosalts, antimonite, and berthierite. The Darasun trend of the sequence of Pb–Sb sulphosalts from bulangerite to fülöppite is typical of post-magmatic hydrothermal gold deposits and differs from that of telethermal ones. There are two fülöppite types in Darasun ores: fülöppite enriched in arsenic (up to 7.5 wt %), which is probably the product of replacement of geocronite and fahlerz mineral series, and arsenic-free fülöppite associated with antimonite and calcite. The composition of arsenic-bearing fülöppite is Pb2.90Ag0.06Cu0.05)3.01(Sb7.05As0.91Bi0.04)8.00S14.99 and the composition of arsenic-free fülöppite is (Pb2.83Cu0.18)3.01Sb7.98S15.01, which are close to stoichiometric. The Darasun fülöppite is characterized by a positive correlation between As, Bi, and Ag; arsenic-free fuloppite is enriched in copper.

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Funding

This study was supported by the Russian Foundation for Basic Research, project no. 19-05-00490.

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Authors and Affiliations

  1. Department of Geology, Moscow State University, 119991, Moscow, Russia

    E. M. Spiridonov, N. N. Krivitskaya, I. A. Bryzgalov, N. N. Korotaeva & K. N. Kochetova

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  1. E. M. Spiridonov
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  2. N. N. Krivitskaya
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  3. I. A. Bryzgalov
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  4. N. N. Korotaeva
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  5. K. N. Kochetova
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Correspondence to E. M. Spiridonov, N. N. Krivitskaya, I. A. Bryzgalov, N. N. Korotaeva or K. N. Kochetova.

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Translated by A. Bobrov

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Spiridonov, E.M., Krivitskaya, N.N., Bryzgalov, I.A. et al. Fülöppite Pb3Sb8S15 from the Darasun Volcanogenic–Plutonogenic Gold Deposit (Eastern Transbaikalia). Moscow Univ. Geol. Bull. 75, 616–620 (2020). https://doi.org/10.3103/S0145875220060125

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