沙溪斑岩型铜(金)矿床成矿地球化学研究及靶区圈定

A STUDY ON METALLOGENIC GEOCHEMISTR Y AND DELINEATION FOR MINERALIZATION TARGET IN SHAXI Cu-Au PORPHYRY DEPOSIT

沙溪和菖蒲山地区位于扬子金属成矿带中部,前者是一个已经探明并圈定地质储量的中型斑岩型铜(金)矿床.本文通过地质-地球化学-地球物理综合研究,在沙溪矿床的邻区———菖蒲山地区预测并应用高精度地球物理方法圈定了一个与已知矿床规模相近的斑岩铜矿成矿异常区,该异常区由硫化物矿化所引起,呈北北东展布,长1500m,宽500m,总面积接近0.8km2。本文提出了一个斑岩型铜矿的控矿模型,结合区域资料和前人关于我国铜矿成矿研究成果,综合分析得出,本区为形成大型斑岩型铜(金)矿床的有利成矿远景区。

Shaxi and Changpushan areas are loca ted in the middle part of Yangtze meta llic mineralization valley,East China;the former area i s a known explored porphyry Cu -Au dep osit.In this paper the geo-logical,geochemical and geophysic al methods are combined together to i nvestigate Changpushan area adjacent to Shaxi with sulfide mineralizatio n.As a result,another porphyry Cu -Au deposit in Changpushan area is prospected,which has the similarity to that of Shaxi porphyry Cu -Au deposit.The controlled anomaly area by geophysical exploration in Changpushan is in NNE direction with more t han 1500meters long and 500meters wide covering an area of about 0.8km 2 .The study shows that the anomaly is c aused by sulfide mineralization in comparison with t he Shaxi porphyry Cu -Au deposit.A model responsible for controlling ore bodies has been proposed in this r egion.Combining with the tectonic background of forming of la rge porphyry Cu -Au deposits in China,we proposed the fact that whole area has the advantage to form a large porphyry Cu -Au deposit.