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张家坪子金矿床位于冕西金矿集中区,矿体赋存于中三叠统第三段第五层(T2~(3-5))的蚀变白云岩及花岗斑岩脉中,矿体与围岩成渐变过渡关系.区内断裂控矿明显,构造线主体为NNE向,张家坪子韧性剪切带是该金矿床惟一的成矿-容矿构造,严格控制着金矿床的形成和矿体的产出.通过C、O、H、S稳定同位素及流体包裹体的研究,认为该矿床成矿热液以变质水为主,并有部分岩浆水,金成矿物质主要来源于地幔,主成矿期为25 Ma;主成矿期成矿温度峰值集中于200~280℃,其成矿深度峰值主要集中在1.5~2.4 km,属于浅成低温热液型金矿床.
The Zhangjiapingzi gold deposit is located in the Miansi gold deposit and the orebodies occur in altered dolomite and granite porphyry veins of the fifth member (T2 ~ (3-5)) of the third member of the Middle Triassic. The ore The body and the surrounding rock have a gradual transitional relationship with obvious ore-controlling in the area and the main tectonic line being NNE direction. The Zhangjiapingzi ductile shear zone is the only metallogenic-ore-bearing structure of this gold deposit and strictly controls the formation of gold deposits and Ore production. Through the study of C, O, H, S stable isotopes and fluid inclusions, it is considered that the ore-forming hydrothermal fluids are mainly metamorphic water and some magmatic water. The gold mineralization mainly comes from the mantle, The main metallogenic stage is 25 Ma. The main mineralization temperature is concentrated in the range of 200-280 ℃. The mineralization depth mainly concentrates in 1.5-2.4 km and belongs to epithermal-gold deposits.