Fluid Inclusion Study on the Moyoulete Sb-Cu Deposit, Xinjiang, China

Abstract

The Moyoulete Sb-Cu deposit occurs in Devonian Kelan volcanic-sedimentary basin, which strikes NW-SE along the south margin of Altay Mountains, hosted in lower Devonian upper kangbutiebao formation. Sulfide quartz veins could be divided into two stages: early stage (Q1), charactered by white lenticular or veinlet quartz veins of copper mineralization occurring in metamorphic crystal tuff, metamorphic basic volcanic rock, or rhyolite porphyry; late stage (Q2), charactered by copper-bearing grey-white pyrite-quartz veins cutting the metamorphic rocks. The four types of fluid inclusions in the quartz veins can be identified: 1) CO2-rich fluid inclusions; 2) Water-rich fluid inclusions; 3) Carbonic fluid inclusions; 4) Aqueous fluid inclusions. CO2-rich fluid inclusions in Q1 have Tm, CO2 = -61.9∼ -57.9 °C and Th,CO2 = -10.0∼21.6 °C; the Th,totS’ are 358∼388 °C, while in Q2 have Tm,CO2 = -63.2∼ -60.2 °C and Th,CO2 = -20.4∼17.4°C; the Th,totS’ are 270∼325°C in the Moyoulete Sb-Cu deposit. The characteristics of CO2-rich fluid inclusions from the Moyoulete Sb-Cu deposit are similar to those from other Cu-Au mineralization localities. The genesis of vein Sb-Cu mineralization was connected with the orogeny-metamorphism hydrothermal fluid, resulting from the orogeny metamorphism of the Late Permian-Triassic in the south margin of the Altay Mountains.