大背坞-瑶里成矿带西段芳村金矿矿床成因及找矿标志

Fangcun Metallogenic Beltofgold Deposit,Genesisand Prospecting Criteria in the West of Dabeiwu-Yaoli

矿区位于扬子准地台江南台隆东段高台山台拱近核部区域构造以北东-北东东向的线型褶皱为其主要特征。矿区金矿产于中元古界双桥山群横涌组中。据区域性地层含矿性统计资料,横涌组金的丰度高达44.32×10-9,为本区形成金的工业矿体提供了矿质来源。中元古界双桥山群横涌组岩石片理化、重结晶作用明显、斑点构造发育的部位是寻找该类型金矿的直接标志。矿床的成因类型为中深成地热水与变质水叠加的中低温热液蚀变破碎带-石英脉型金矿床。

Mine is located in Yangzi quasi platform Southern Taiwan Tai Lung Gaotai mountain in the eastern section of the arch near the core of the regional tectonic in NE-NEE to linear folds is its main feature. The gold deposit occurs in the Middle Proterozoic Shuangqiaoshan group cross Bay group. According to the regional raphic ore bearing data, the abundance of gold in the group of the cross is reached to 44.32× 10-9, which provides a source of mineral resources for the formation of gold in this district. Middle Proterozoic Shuangqiaoshan group cross Chung group schistose rock, recrystallization effect is obvious, mottled structure development site is looking for a direct sign of this type of gold deposit. The genetic type of the deposit is a medium low temperature hydrothermal alteration of deep geothermal water and metamorphic water into a superposition of belt - broken quartz vein type gold deposit.