Abstract

The Jiaojia gold deposit is located in the northwest jiaodong ore-concentrated area, north wing of Laizhou-Xixia anticlinoria, the orebody occurred in the granite which exists the footwall of Jiaojia Fault, Jiaojia Fault is the eastern secondary NE-NNE trending fault of Tan-Lu Great Fault. There are three types of fluid inclusion in Jiaojia gold deposit, respectively are H₂O-CO₂ inclusion (H-C type), CO₂-H₂O-CH₄ inclusion (CH₄ -bearing type) and H₂O inclusion (H type). In Jiaojia gold deposit, the main ore-forming temperature is 170.2～358.1℃, the salinity is ranging from 2.04 wt% NaCl.eq to 10 wt% NaCl.eq with a average of 6.64 wt% NaCl.eq, sum intensity is (0.89～0.946) g/cm³ , pressure estimation is 2×10³～3.8×10³kPa, the Jiaojia gold deposit is mesothermal gold deposit. The metallogenic substances derived from a mantle-crust-mixed source according to the S and Pb isotopes. The Jiaojia gold deposit was formed in the late stage which was a tensional environment. The ore-forming fluids mainly derived from magmatic and meteoric water, and a fraction of metamorphic water. The Jiaojia gold deposit is formed in the Yanshanian.

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