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MINERALOGICAL FEATURES OF DISSEMINATED GOLD-SULFIDE ORE OCCURRENCES IN THE NORTH-EASTERN SIBERIAN PLATFORM
Abstract
There are the results of studies of mineralogical features of gold-sulfide ore occurrences of disseminated type of three tectonic structures of different grade of the north-eastern Siberian platform: Sololiy, Ebelyakh uplifts and Anabar shield. At the Sololiy uplift of the Olenek arch ??, superposed disseminated ore mineralization is studied in the Early Permian quartz fine-pebble conglomerates. Ore mineralization is confined to thin zones of conglomerate cataclasis and crushing, caused by tectonic impact, and related to the Mesozoic tectonic activation. Near-fault hydrothermal-metasomatic formations with disseminated gold-sulfide mineralization are discovered and studied in carbonate strata of the Ebelyakh uplift for the first time. These formations belong to apocarbonate-siliceous tectonogenous suite. Disseminated ore mineralization is represented by gold, silver, pyrite, sphalerite, chalcopyrite, galena, argentite, antimonite, cinnabar, native tin. Due to the fact that, metasomatic formations and related ore occurrences are localized in fault zones, renewed in the Mesozoic, it is assumed that, the studied ore occurrences were formed as a result of the Mesozoic tectono-magmatic activation. In the territory of the Anabar massif, sulfidized rocks of syenite-monzonite series are identified in the field of the Archean gneiss development. Study of ore mineral paragenesises (gold, pyrite, chalcopyrite, pyrrhotite) and comparison with mineral inclusions in placer gold allowed supposing that, these rocks could be one of primary gold sources. In general, discovery of gold-sulfide ore occurrences of disseminated type indicates potential ore gold content of the north-eastern Siberian platform
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