安徽东至县方坑坞—杨树桥地区金矿化特征及成因探讨

Characteristics and causes of gold mineralization in the Fangkengwu-Yangshuqiao area,Dongzhi County,Anhui Province

安徽东至县方坑坞—杨树桥地区金多金属矿大地构造位置处于扬子准地台下扬子台坳的石台穹褶断束与江南台隆交接部位,受近东西向断裂控制。金矿(化)体主要产于休宁组与小安里组层间破碎带及邓家组与葛公镇组界面韧性剪切带中,呈脉状、网脉状,总体北倾。矿石矿物主要有自然金、褐铁矿、黄铁矿等,脉石矿物以石英为主,次为绢云母、绿泥石等。矿化类型为石英脉型金矿及含金构造蚀变岩型。找矿标志有构造、石英脉、蚀变、化探异常等。

The geotectonic position of the gold polymetallic ore in the Fangkengwu-Yangshuqiao area of Dongzhi County,Anhui is located at the junction of the Shidai dome folded fracture bundles and the Jiangnan plateau in the lower Yangtze plateau of the Yangzi quasi-terraneous plateau.It is controlled by the near east-west fracture.The gold mineralization ore bodies are mainly located in the interlayer crushing zone between the Xiuning group and the Xiaoli group,as well as in the tough shear zone at the interface of the Dengjia group and the Gegongzhen group,appearing vein-like or in a network,generally dipping northward.The main ore minerals include natural gold,limonite,and pyrite,while the vein minerals are mainly quartz,followed by sericite and chlorite.The mineralization types consist of quartz vein-type gold ore and gold-bearing tectonic alteration rock type,with exploration indicators such as structures,quartz veins,alteration,and geochemical anomalies.