Metallogenic age and genesis of Jinshan gold deposit, Jiangxi province, China

The Jinshan gold deposit consists of gold-bearing ultramylonite and gold-bearing quartz vein ores. The Rb-Sr isochron age of fluid inclusions in quartz from quartz veins is the same as that of the gold-bearing ultramylonite, suggesting that both the types of orebodies were formed simultaneously in the Caledonian period, in the range 406 - 409 Ma. REE patterns and sulfur, lead, carbon, hydrogen and oxygen isotope data, as well as the composition of fluid inclusions, have shown that the ore-forming fluids were derived from formation water, and the ore-forming materials came from the gold-hosted rocks. The Jinshan gold deposit occurring in a Caledonian brittle-ductile zone in metamorphosed microclastic rocks owes its origin to Caledonian reworking processes.