Abstract
The relationships between the δ18O of quartz veins and veinlets pertaining to the main stage of gold mineralization at the Sukhoi Log deposit and metasomatically altered host slates are estimated. The oxygen isotopic composition of veined quartz and host slates is not uniform. The δ18O of quartz veins from the Western, Central, and Sukhoi Log areas of the deposit vary from +16 to + 18 ‰. The δ18O range of metasomatically altered slates in the Western and Sukhoi Log areas attains 6 ‰. The δ18O of quartz veins are always higher than those of host slates by 3–7‰. The regular difference in the δ18O between quartz veins and host slates indicates that the oxygen isotopic composition of the ore-bearing fluid forming the system of quartz veins and veinlets at the Sukhoi Log deposit could have formed as a result of interaction with silicate rocks, for instance, terrigenous slates enriched in δ18O. Such interaction, however, took place at deeper levels of the Sukhoi Log deposit. It is suggested that the fluid phase participating in the formation of the vein and veinlet system had initially high δ18O(>+10‰) due to interaction with the rocks enriched in δ18O at a low fluid/rock ratio. The oxygen isotope data indicate that the fluid participating in the formation of gold mineralization at the Sukhoi Log deposit was not in equilibrium with igneous rocks at high temperatures.
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Original Russian Text © T.A. Ikonnikova, E.O. Dubinina, M.R. Saroyan, A.V. Chugaev, 2009, published in Geologiya Rudnykh Mestorozhdenii, 2009, Vol. 51, No. 6, pp. 560–567.
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Ikonnikova, T.A., Dubinina, E.O., Saroyan, M.R. et al. Oxygen isotopic composition of quartz veins and host rocks at the Sukhoi Log deposit, Russia. Geol. Ore Deposits 51, 505–512 (2009). https://doi.org/10.1134/S1075701509060075
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DOI: https://doi.org/10.1134/S1075701509060075