Abstract
Detailed structural study of ore zones and deformations in host rocks reveals the multistage tectonic evolution of the Malo-Taryn ore field. Gold–quartz mineralization is confined to the interstratal and longitudinal thrust faults, where vein–stringer bodies are systematically oriented relative to the structures of the thrust stage. Antimony mineralization is superposed on gold–quartz mineralization in the same structures, being associated with veins formed during the shear stage of deformations. It is determined that the types of mineralization were formed in the following sequence: gold–bismuth, low-sulfide gold–quartz, berthierite–antimonite, and silver–antimony. Data on mineral assemblages and typomorphic features of minerals are reported. The isotope composition of minerals, temperature conditions, and composition of orebearing fluids are studied. It is established that the same minerals ascribed to different types of mineralization sharply differ in typomorphic features, which is caused by the different composition and genesis of the hydrothermal fluids. The superposition of different types of mineralization on one another within repeatedly activated tectonic structures that were fluid-permeable for a long time is an important indication of large-scale deposits.
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Original Russian Text © V.Yu. Fridovsky, G.N. Gamyanin, L.I. Polufuntikova, 2015, published in Tikhookeanskaya Geologiya, 2015, Vol. 34, No. 4, pp. 39–52.
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Fridovsky, V.Y., Gamyanin, G.N. & Polufuntikova, L.I. Structures, mineralogy, and fluid regime of ore formation in the polygenetic Malo-Taryn gold field, Northeast Russia. Russ. J. of Pac. Geol. 9, 274–286 (2015). https://doi.org/10.1134/S1819714015040028
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DOI: https://doi.org/10.1134/S1819714015040028