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长坑金银矿床方解石的δ13C值为-3．23‰，方解石和石英的δ18O分别为8．64‰～18．61‰和9．60‰～13．0‰，其范围与其它卡林型金矿相似。结合大本（Ohmoto）模式的理论分析，认为成矿热液的总联同位素组成可大致取为-2‰～－17‰，即碳主要来自地层中的沉积碳酸盐，部分来自有机碳。推导出水岩交换过程中流体氢、氧同位素演化的一般性协变方程并进行了理论模拟，认为成矿流体以燕山晚期一第三纪的加热大气降水或建造水为主。
The δ13C value of calcite in Changkeng gold-silver deposit is -3.23 ‰, while the δ18O values of calcite and quartz are 8.64 ‰ ~ 18.61 ‰ and 9.60 ‰ ~ 13.0 ‰, respectively, Gold is similar. According to the theoretical analysis of Ohmoto mode, the total isotopic compositions of hydrothermal fluids are thought to be approximately -2 ‰ to -17 ‰, ie, carbon is mainly derived from sedimentary carbonate in the formation and partly from organic carbon. The general covariance equation of hydrogen and oxygen isotope evolution during fluid-rock exchange is derived and theoretically simulated. It is concluded that the ore-forming fluid is dominated by heated atmospheric precipitation or water in the late Yanshanian-Tertiary.