Lubavinskoe Au-bearing ore deposit: petrochemical features of rocks and ores, and the origin conditions (Eastern Transbakalia)

Abstract

Lubavinskoe Au-bearing ore deposit is situated to submeridional deep layered tectonic zone. In these zones the ore veins are associated with small Mesozoic stocks of granodiorite and rocks of the dyke complexes of the sublatitudinal spread. According to geochemical features these intrusions are correspond to adacits. The proportion isotopic ratio of the oxygen and strontium at granodiorites indicates to their origin due to mantle-core interaction. Calculated oxygen isotope composition δ18 in the fluid in equilibrium with quartz in the productive phase 220-280 °С changes from 3,59 to 9.59‰, which corresponds to water of magmatic fluid nature. This is confirmed by the isotopic composition of sulfar for sulphides δ34S, ‰ from +0.7 to +6.7‰, corresponding to hydrothermal orogenic ore deposits.