The Sources of Ore‐forming Fluids from the Jinchang Gold Deposit, Heilongjiang Province, NE China: Constraints from the He–Ar Isotopic Evidence

The Jinchang gold deposit (more than 40 tons of gold) is located in the easternmost portion of the Central Asian Orogenic Belt. The gold mineralization types include mainly breccia, quartz vein and alteration rock types. Geological and geochemical characteristics suggest that the Jinchang gold deposit formed by the superposition of epithermal gold deposits and porphyry gold deposits. In this study, the helium and argon isotopic compositions of...