Fluid Inclusions and C–H–O–S–Pb Isotopes of the Huoluotai Porphyry Cu (Mo) Deposit in the Northern Great Xing’an Range, NE China: Implications for Ore Genesis

The Huoluotai Cu (Mo) deposit is a recently discovered porphyry in the northern Great Xing’an Range, NE China. Fluid inclusion (FI) micro-thermometry results and C–H–O–S–Pb isotope compositions of are presented this study. ore-forming process consists sulfide-barren quartz stage (I), + chalcopyrite ± pyrite molybdenite (II), polymetallic sulfide (III), calcite fluorite (IV). mineralization occurred mainly II. Four types FIs were recognized: liquid-rich two-phase (L-type), vapor-rich (V-type), daughter-mineral-bearing three-phase (S-type), CO2-bearing (C-type). In I, fluids belong to an H2O−NaCl−CO2 system. stages II, III, IV, H2O−NaCl FI H–O analysis show that originated from magmatic origin I mixed with meteoric water II IV. S–Pb suggest source materials has characteristics crust–mantle-mixing origin. boiling micro-thermometric data further was deposited below 400 °C suggesting fluid occurring may be primary factor for precipitation deposit.