Geological and Geochemical Characteristics of Fluid Inclusion in Xiajiadian Gold Deposit, Shaanxi Province

The Xiajiadian gold deposit is a newly-discovered ore deposit occurring in the contact between Sinian and Cambrian strata. The major ore type is gold-bearing breccia. Also, the silicification relating to the goldm ineralization is closely related to the regionalmulti-phased faulting. This paper discusses the processes of mineralization for the deposit through study of fluid inclusion in minerals and O and H isotopes geochem istry. The fluid inclusion contents in quartz of ore-forming minerals are rich in Cl^- and SO₄^2- ,and the ore-forming fluid belong to CO₂-H₂O-XCl-XSO₄ (Xmeans positiveion). The inclusion composition reflects that orogenic processes provided ore-forming fluids for the gold mineralization. H and O isotopic com position shows that ore forming fluid is metam orphic water rich in δ¹⁸OH₂O.