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MINERALOGICAL-GEOCHEMICAL CHARACTERISTICS AND THE FORMATION CONDITIONS OF DYVOK ORE OCCURRENCE (SOUTH YAKUTIA, RUSSIA)

Varonika Kardashevskaia

Abstract

The paper presents the results of the research of ore mineralization in quartz, quartz-sulfide, quartz-carbonate-barite, carbonate-barite veins of Dyvok ore occurence. The object of the research is located in the South-East of The Sakha Republic (Yakutia) and is a part of the Stanovoy gold-bearing region. The gold mineralization was found out to belong to gold-quartz-sulfide type, to relate to the stock of Cretaceous granite-porphyry and to be located in the K-feldspar-quartz metasomatites, beresitization and arkiletian rocks. The results of the research indicate that the ore mixture is represented by the following minerals: pyrite, arsenopyrite, secondary minerals: sphalerite, galena, chalcopyrite, boulangerite, barite, native gold, accessory minerals: monazite, zircon, rutile. Native gold is most often attested in the form of small inclusion in pyrite and is of rather low fineness of 630-800?. On the basis of these observations the following sequence of mineral formation has been produced: 1) arsenopyrite-pyrite-quartz; 2) gold-pyrite-quartz; 3) gold-pyrite-chalcopyrite-sphalerite and 4) quartz-boulangerite. For the first time preliminary thermobarogeochemical investigations of the inclusions in quartz of arsenopyrite-pyrite mineral association, where the temperature of complete homogenization in the interval from 155 to-310В°C and pressure of 0.7 kbar was determined. This indicates a medium temperature and medium-deep mineral formation condition.

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DOI resolver: doi.org/10.5593/sgem2018/1.1/s01.034

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