UDC 553.411(470,5)
Role of intrusive magmatism in genesis of Berezovsk gold deposit (Middle Urals)
V. V. Babenko, Yu. A. Polenov, V. N. Ogorodnikov
Berezovsk post magmatic deposit (Middle Ural) is a classic gold mine object of quartz-vein type with a unique geological and structural position, and therefore the identification of laws of placing of ore miner- alization at such a facility makes it possible to discover new objects of this type, and not only in the Urals. Berezovsk deposit is characterized by joint presense of granitoids and hyperbasites in the areas of gold mineralization. It was found that the gold mineralization is spatially associated with basit-hyperbasites of Pyshminsk-Berezovsk massif, but is maximally manifested in the area of its intersection with Berezovsk dike complex. The article shows the role of ore generating intrusive magmatism in the distribution of gold mineralization of Berezovsk gold deposit, settles close relationship of ore mineralization with intrusive igneous rocks, dunite-harzburgite, gabbro, tonalite, granodiorite and granite formations. It has been shown that the development of mineralization in the ore field is the result of multiple stepwise anatexis associated with diverse geological processes of early and late collisions that led to the formation of pluton of granitoids with dike bundles of granitoids, containing postmagmatic steeply dipping quartz-sulphide transverse to the dikes veins. Hydrothermal mineralization of Berezovsk ore field is genetically linked to the Grand Shartashsk massif of granitoids of tonalite-granodiorite formation. This is confirmed by a vertical zonation of wallrock metasomatic rocks within of Berezovsk ore field, as well as zoning of productive ore mineral associations, defined by power and form of Shartashsk massif roofing. Ore localizing role of mag- matism in the distribution of gold mineralization in quartz-sulfide veins of Berezovsk deposits is caused by geological and structural position of of Berezovsk ore field, early-collisional magmatism of dike series and late-collision post-magmatic activity. Pulses of tectonic movements preceded all these processes.
Keywords: Berezovsk mine; Pyshminsk-Berezovsk hyperbasite massif; Shartashsk massif; ultrabasites; gabbro; granitoids; mineralized dike structure.
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