论文部分内容阅读
长坑金矿主要产在长坑下石炭统灰岩与上三叠统页岩断层不整合面下的硅质岩中，矿化可分为两期，早期金矿化为层状及透镜状，和硅质岩的产状一致，其δ34S‰。在─35．4～—0．3之间，极差大，变化大，具沉积硫的一般特征；成矿流体的δD‰为─80～—59。晚期矿化主要以辉锑矿-石英脉形式产出，其δ34S‰：0．8～2．3，均一，变化小，和早期矿化有明显差异，晚期矿化成矿流体的δD‰：─30～—46。两期矿化铅同位素组成相似，和下伏地层的基本一致。据矿床的地质地球化学特征及前人有关硅质岩成因认识，认为长坑金矿早期矿化主要是热水沉积形成的，晚期矿化是改造形成的，成矿物质主要来自下伏地层。
The Changkeng gold deposit is mainly produced in the chert under the unconformity between the Chang-keng Lower Carboniferous limestone and the Upper Triassic shale fault. The mineralization can be divided into two phases, the early gold mineralization is stratified and lenticular , Consistent with the origin of the chert, its δ34S ‰. Between -35.4 and -0.3, there is great range and great variation, with the general characteristics of sedimentary sulfur. The δD ‰ of ore-forming fluids is -80 ~ -59. The late mineralization is mainly in the form of stibnite-quartz vein with δ34S ‰ of 0.8-2.3, which is uniform and small change, which is obviously different from the early mineralization. The δD ‰ of late mineralization: 30 ~ -46. The two mineralized lead isotopes are similar in composition to the underlying strata. According to the geological and geochemical characteristics of the deposit and the predecessors’ understanding of the genesis of the cherts, it is believed that the early mineralization of the Changkeng gold deposit is mainly formed by hydrothermal sedimentation. Late mineralization is reformed and formed, and the ore-forming materials mainly come from the underlying strata.