四川九龙黑牛洞铜锌矿床地质特征及成因探讨

四川省九龙县黑牛洞铜锌矿床为一个产于前震旦系江浪变质核杂岩中的富铜矿床,受穹隆内发育的环状滑脱构造系统控制。通过对矿床地质特征、成矿物质来源、氢氧同位素等方面的研究,认为矿床的成矿物质主要来自于深部,成矿热液是大气降水和变质水组成的混合流体。矿床的成矿时代为燕山期,矿床的形成与区域构造-岩浆热事件相对应。黑牛洞矿床为中高温变质热液矿床。

Geology and genesis of the Heiniudong copper-zinc deposit in Jiulong,Sichuan

The Heiniudong copper-zinc deposit in Jiulong,Sichuan as a medium-sized copper-rich deposit in the Jianglang metamorphic core complexes within the Songpan-Garze orogenic zone is hosted in the metamorphic rocks of the pre-Sinian Liwu Group Complex,and controlled by the ring-shaped decollement structures within the domes.The integration of geology,origin of ore-forming materials and hydrogen and oxygen isotopic compositions shows that the ore-forming materials are derived mainly from the deeper parts,and the ore-forming hydrothermal fluids come from the mixtures of meteoric and metamorphic water.The mineralization of the ore deposit may be traced back to the Yanshanian in general agreement with the regional tectonic-magmatic hydrothermal events.It is concluded that the Heiniudong copper-zine deposit is a moderate-to high-temperature metamorphic hydrothermal ore deposit.