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ISOTOPE RATIO 87SR/86SR IN NICKEL ORE OF THE URALIAN SUPERGENE DEPOSITS AND THEIR GENESIS
Abstract
Genesis of the Uralian oxide-silicate supergene nickel deposits remains disputable. There are supergene and polygenic hypogenous model of their origin. The second model usually involves supergene and hydrothermal-hypogenous stages of formation. To solve this problem isotope ratio 87Sr / 86Sr was determined for the first time for the Ufalei and Sakhara supergene nickel deposits. The obtained data on the 87Sr / 86Sr isotopic ratio in samples from ore zones are divided into two groups, which indicate two sources of strontium and the participation of several genetic processes in the formation of nickel rocks of the deposits. All samples of serpentinized rocks are on the level of 87Sr / 86Sr = 0.706-0.707, that indicates a single source of strontium for them, and these ratios are closer to mantle ones, compared with exogenous quartz-goetite rocks of the iron-oxide zone. In both deposits 87Sr / 86Sr ratio increases from low-altered hypogenous serpentinite rocks of the lower part of the deposits (0,70583 and 0,70687) to exogenous iron-oxide rocks of the upper part of the deposits (0,70917 and 0,71004). The average obtained 87Sr / 86Sr ratio in the Sakhara deposit (0, 70838) is higher than in the Ufalei deposit (0, 70697), that indicates a greater influence of exogenous processes on the formation of the weathering profile of the Sakhara deposit.
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