Abstract
The oxygen isotopic composition of minerals (Qtz, Zrn, Kfs) and bulk samples of Late Cretaceous porphyritic leucogranites of the Omsukchan trough, which are associated with the formation of tin and Sn-polymetallic mineralization, was studied. The δ18O values of bulk samples of leucogranites decrease from +9.7‰ (outside the Dukat ore field) to 10.6‰ (within the ore field), and the light isotope characteristics are mainly an attribute of feldspars and correspond to isotope exchange with meteoric fluid (δ18О = –15‰), over a wide range of T at limited fluid-to-rock ratios (W/R from 0.9–1.6 to 0.3–0.1). Unlike feldspars, the δ18O values of quartz and zircon are partially changed, in the former, probably, by the diffusion mechanism, and in the later, by the dissolution-precipitation one.
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