MAGMATIC-HYDROTHERMAL DEPOSITS OF THE HUNJIANG BASIN, JILIN PROVINCE, NE CHINA, WITH A FOCUS ON THE WHITE MOUNTAIN BRECCIA-HOSTED GOLD DEPOSIT
The majority of the deposits in the Hunjiang basin are of magmatic-hydrothermal or hydrothermal origin, with the exception of sedimentary deposits of coal, hematite, gypsum, and phosphorus. Porphyry Cu, Cu-Au, and Mo deposits and related skarn and epithermal deposits that have been exploited for Au, Ag, Sb, Zn, and Pb, are scattered throughout the basin. The basin also hosts a range of sedimentary rock-hosted gold deposits and occurrences, including White Mountain. The style of mineralization and the alteration assemblage at White Mountain indicate that ore formation occurred at temperatures of less than 200°C from moderately acidic fluids. LA-ICP-MS geochronology of zircons from porphyries, intrusive igneous rocks, and volcaniclastic rocks within the basin give Middle Jurassic to Late Cretaceous magmatic ages. This suggests that the White Mountain gold deposit, along with other magmatic-hydrothermal and hydrothermal deposits in the basin, may have formed during late Mesozoic regional extension.