Initial discussion on paleo-fluid geologic process and sandstone-type uranium metallogenesis at southwestern edge of Turpan-Hami basin

Through the study on features of epigenetic alterations and fluid inclusion, two stages of obvious paleo-fluid geologic process have been affirmed in Shuixigou Group (J1-2sh), Middle-Lower Jurassic at the southwestern edge of Turpan-Hami basin: the earlier one is an oxidizing acidic paleo-fluid and the latter one is a reducing alkalic paleo-fluid. The first one caused extensive interlayer oxidation zone consisting of 'yellow' and 'red' alteration of rocks, and is favorable for uranium metallogenesis. The second one led to the formation of the 'calcrete', and unfavorable for uranium metallogenesis. According to the composition of gas-liquid inclusion, it is thought initially that the paleo-fluid is mainly composed of groundwater and gas originated from coal