GEOLOGIC STRUCTURE, MINERALOGY, AND GEOCHEMISTRY OF THE NERUNDA GOLD ORE FIELD (northern Transbaikalia)
I.V. Chetvertakov1, V.A. Vanin1, I.A. Demin2
1Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
2Irkutsk State University, ul. Karla Marksa 1, Irkutsk, 664003, Russia
Keywords: Gold ore field, ore complex, deep fault, intrusive complex, dike series
Abstract
We consider the geologic structure of the Nerunda gold ore field located in the Nerunda-Mama ore district in northern Transbaikalia. Gold-quartz low-sulfide formation and ore-bearing carbonate-terrigenous strata and intrusive complexes are briefly described. An ore complex of beresite-listvenite metasomatites hosting carbonate-quartz veins and vein-veinlet zones is characterized. Two stages of ore formation have been recognized. Anomalous geochemical associations and the composition of ore mineralization typical of these stages have been established. Mineralogical and geochemical studies of gold-bearing metasomatites of the Nerunda ore field were carried out. The known geochemical and mineralogical search criteria used for the assessment of the erosion zone level of gold deposits were applied to the geologic conditions of the Nerunda ore field and the Nerunda-Mama gold ore district as a whole. The emphasis was made on the express assessment of the erosion zone level at the early stage of prospecting. We draw a conclusion about the gold potential of the poorly studied ore objects at depth and give guidelines for the following geological exploration.
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