大湖塘矿田构造、花岗岩与钨成矿关系探讨

Relationship between the Structure and Granite-Tungsten Mineralization of Dahutang Ore Field

大湖塘钨矿田位于扬子古板块东南缘,属长江中下游成矿带重要组成部分,其发现彻底改变了江西"南钨北铜"的资源格局。针对大湖塘燕山期岩浆岩演化与成矿的关系、构造作用对成矿的影响进行了论述。分析矿体主要赋存在早白垩世岩浆岩接触带附近及爆破角砾岩内,与晋宁晚期黑云母花岗闪长岩和燕山期酸性深成至浅成花岗岩关系密切。矿区内成矿流体主要为中高温、低盐度流体,硫同位素具有幔源硫的特征;在构造体系方面,韧性剪切带、断层及节理发育部位有重要的控矿作用。

Located in the southeastern margin of the Yangtze paleoplat important part of Yangtze River＇s metallogenic belt, which completely c e, Dahutang Tungsten Ore held ＇s an hanges the resource pattern of Jiangxi Province, being ＂tungsten in the south and copper in the north＂ . This paper discusses the relationship between magmatic rocks evolution mineralization and the effects of tectonism on mineralization during Yanshan period of Dahutang. Results show that ore body mainly existed near the contact zone of magmatic rocks of the early cretaceous breccia and in blasting breccia, which had an extremely close relationship with the late Jinningian biotite granodiorite and Yanshanian acidic plutonic to hypabyssal granite. Forming fluids within the mining area were mainly medium-high temperature and low salinity fluids. Sulfur isotopic have the characteristics of mantle-derived sulfur. In the ductile shear zone and fault and joint development are important ore control areas n the structural system.