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马鞍桥金矿床产于西秦岭造山带商丹断裂带南缘的E-W脆-韧性剪切带中,矿床空间定位和矿体展布受脆-韧性剪切带控。选择马鞍桥金矿床矿石、地层岩石和二长花岗斑岩的代表性样品,针对性地开展碳-氧和氢-氧同位素分析测试。研究结果证明:成矿早阶段和主阶段成矿流体以变质热液或地层改造热液为主,而晚阶段则主要为大气降水。马鞍桥金矿床矿化地质特征和同位素地球化学组成为广义的类卡林型金矿床或属介于造山型和卡林型金矿床之间的过渡类型。
The Madangqiao gold deposit is produced in the E-W brittle-ductile shear zone at the southern margin of the Shangdan fault zone in the Western Qinling orogen, and the spatial distribution of orebodies and orebody distribution are controlled by the brittle-ductile shear zone. Representative samples from the Archean gold deposit, stratigraphic rocks and monzonitic granite porphyries were selected for carbon-oxygen and hydrogen-oxygen isotope analysis. The results show that the metallogenetic fluids in the early stage and the main stage of metallogenesis are dominated by metamorphic hydrothermal fluids or stratigraphic alteration of hydrothermal fluids, while the late stage is mainly the atmospheric precipitation. The mineralization geology and isotope geochemistry of the Ma’anshan gold deposit are broadly carlin-like gold deposits or belong to the transitional type between the orogenic and Carlin-type gold deposits.