陕西梅子铺金矿地质特征及矿床成因分析

Geological characteristics and genesis analysis of Meizipu gold deposit in Shaanxi

陕西省安康梅子铺金矿位于南秦岭南部晚古生代隆升带,为一典型的含金石英脉型矿床。矿体产出形态、规模受断裂构造带控制明显,次级断裂为成矿热液的迁移及沉积提供了通道和场所,区内大面积出露的晚元古代凤凰山石英闪长岩和燕山期花岗岩为成矿提供物质和热动力来源。通过对梅子铺金矿硫同位素进行研究,发现其与文峪和东闯金矿床硫同位素特征相似,各类硫化物的平均值与低温热液矿床和岩浆硫的平均值十分接近,由此推断,梅子铺金矿硫源为混合硫,是岩浆热液与变质岩地层相互作用的产物。该矿床主要成矿作用为热液充填-交代作用。

Meizipu gold deposit in Ankang City,Shaanxi Province is located in the late Paleozoic uplift belt in the south of the South Qinling,and it is a typical gold vein type deposit.The shape and scale of ore bodies are obviously controlled by the fault structure belt,and the secondary faults provide channels and places for the migration and deposition of the ore-forming hydrothermal solution.The late Proterozoic Fenghuangshan quartz diorite and Yanshan granite,which are widely exposed in the area,provide material and thermal power sources for the mineralization.The sulfur isotope characteristics of Meizipu gold deposit are similar to those of Wenyu and Dongchuang gold deposit,and the average values of various sulfides are very close to those of low-temperature hydrothermal deposits and magmatic sulfur.Therefore,it can be inferred that the sulfur of Meizipu gold deposit is probably a kind of muti-source mixture sulfur,which is the product of the interaction between magmatic hypothermal solution and metamorphic rock strata.The main mineralization process of the deposit is hydrothermal filing metasomation.