Fluid inclusion study on the Duobaoshan porphyry deposit and Sankuanggou skarn deposit, Heilongjiang, China

摘要

In this paper we use new field data, fluid inclummsions, arid table isotopes (O, H, and S) to refine the roles of the hydrothermal evolution, evaluate changes in the hydrothermal fluids of Duobaoshan porphyry Cu(Mo) deposit and Sankuanggou skarn Fe-Cu deposit. Four ore-forming stages are recognized at The Duobaoshan porphyry Cu(Mo) deposit. Fluid inclusions are abundant in quartz of various stages. Estimated trapping pressures for stage I, II, III are 110-160MPa, 58-80MPa, and 8-17MPa, corresponding trapping temperatures are 375-650°C, 310-350°C, 210-290°C. The 5D and δ~(18)O values of fluids indicate a evolution process from magmtic hydrothermal fluid to a mixing inagmtic and meteoric fluid. The δ~(34)S values of sulfides mainly suggest predominantly source of deep magma chamber.