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UDC (553.41.061.17:553.2):(551.732+551.734/.735)(571.51-13) FORMATIONAL FEATURES OF THE IRBINSKY DEPOSIT OF PRECIOUS METALS (WESTERN TRANSBAIKALIA)
A. V. Tatarinov, L. I. Yalovik, V. F. Posokhov
The field envelopes a series of ore zones that are pulled together confined to the steeply dipping tectonic faults cutting the shariage cover. They consist of dynamometamorphic rocks of mainly milonite facies arisen on high-magnesian basic vulcanite of the Kelyan-Irokinda fragment of the Riphean Baikal-Muya greenstone belt. These basalts belong to the bimodal basalt-rhyolitic series of the Upper Riphean Kelyan Formation. Two main industrial mineral types of ore mineralization have been distinguished: the gold-chalcopyrite-pyritequartz and gold-silver-bornite-chalcopyrite-quartz ones. Formation of the ore-forming system of the field is associated with deformation and metamorphic events in the Cambrian, Devonian and Carboniferous periods.
Key words: fields, precious metals, ore-forming system, dynamic metamorphism, ore minerals, mineral types, genesis.
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