GOLD ORE DEPOSITS AND CRETACEOUS GRANITOID MAGMATISM OF CHUKOTKA

The areas of Cretaceous intrusive magmatism occupy almost all entire territory of Chukotka, and the composition and forms of its manifestation are closely related to geodynamic conditions. The spatial analysis shows that the areas of different composition of Cretaceous intrusions, sometimes are combined, denoting local parts confined to the thickest lithosphere blocks with complete development of magmatism associated with deep magmatic supply channels. The most deposits and ore occurrences of Au are localized in terrigenous flyschoid sequences and granitoids and are widespread mainly in the areas of Early Cretaceous granitoid magmatism on a thick collision-type crust. Cu-Mo-porphyry deposits are associated with the Early Cretaceous and Late Cretaceous granitoids of the Oloy and Okhotsk-Chukotka belts. Au-Ag epithermal deposits of the Okhotsk-Chukotka belt are located in the volcanic rocks mainly within the ranges of Late Cretaceous granitoids. In the ores of about 700 ore occurrences the concentration of Bi, Hg, Sb, Sn, W in the Early Cretaceous granitoids, volcanics and terrigenous rocks are higher than in ores of the Late Cretaceous rocks. On the other hand, the ores in the Late Cretaceous rocks contain more Li, Ni, Ag, Zn, Pb, Mn.

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