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长坑矿田金、银矿体主要产于下石炭统与上三叠统不整合面之下的硅质岩中,金、银矿体分离。金矿体主要为浸染状,富集As、Sb、Hg;银矿体主要为脉状,富集Cu、Pb、Zn。金矿体铅同位素组成与寒武纪—石炭纪地层及硅质岩的相同,银矿体铅同位素组成与金矿体的不同。金、银矿体的氢、氧、碳同位素组成也明显不同。银矿体Rb-Sr等时线年龄为70.4Ma。据上述特征,笔者认为长坑金、银矿床是不同成矿作用形成的,金矿主要是热水沉积形成,银矿主要是燕山期晚期改造形成。
The gold and silver ore bodies in Changkeng ore field are mainly produced in chert, under the unconformity between the Lower Carboniferous and the Upper Triassic, and the gold and silver ore bodies are separated. The gold ore bodies are mainly disseminated and enriched in As, Sb and Hg. The silver ore bodies are mainly vein-shaped and enriched in Cu, Pb and Zn. The Pb isotope composition of the gold ore body is the same as that of the Cambrian-Carboniferous strata and silicalite. The lead isotopic composition of the ore body is different from that of the gold ore body. Gold, silver ore body hydrogen, oxygen, carbon isotope composition is also significantly different. The Rb-Sr isochron age of silver ore body is 70.4Ma. According to the above characteristics, I believe that the Changkeng gold and silver deposits are formed by different mineralization, the gold deposits are mainly formed by hydrothermal deposition, and the silver deposits are mainly formed by the late Yanshanian alteration.