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PETROLOGY AND ORE POTENTIAL OF GRANITOIDS FROM THE ISTEKH ORE FIELD (NORTHEASTERN VERKHOYANSK-KOLYMA MESOZOIDES)
Abstract
The paper deals with petrology of granitoids from the Istekh ore field in northeast Yakutia accompanied by complex Au-Ag-Sn-W mineralization. Magmatism of the ore field is represented by the Istekh granitoid massif, a series of granite and rhyolite porphyry dikes, and rare dikes of diorite porphyry and trachydolerite. A polygenetic nature of the massif is documented, with origination of parental melts of the amphibole-biotite granodiorites and granites from the lower and upper crustal protoliths, respectively, under the influence of deep heat and fluid fluxes rising from the metasomatized mantle to the magma-generation level. The emplacement of the massif was characterized by pulsatory, nearly simultaneous intrusion of compositionally variable melts from different depths with the following fusion into a single massif. It is found that all magmatic formations developed within the Istekh ore field show the same geochemical specialization for Au, Ag, Sn, W, Bi, Sb and As. This can be explained by their localization within a highly permeable zone that existed there throughout the Cretaceous epoch and favored the supply of additional heat, volatiles, and ore elements from subcrustal sources over the entire magmatic evolution of the region.
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References17
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