新疆哈密维权银(铜)矿床地质特征和成矿时代

维权银(铜)矿床是2000年发现的一个独立中型银矿。经过野外及室内研究,发现矿床产于塔里木板块北缘活动带觉罗塔格晚古生代岛弧带的南侧,赋矿地层为中石炭统土古土布拉克组浅海相中酸性、基性火山岩、碎屑岩和碳酸盐岩,受区域早期热蚀变作用而发生不含矿的角岩化;受晚期岩体侵入活动作用形成Ag、Cu等矽卡岩矿化;容矿岩石为钙铁榴石矽卡岩,是一个远离侵入体的以银为主的多金属矽卡岩型矿床。采集维权银(铜)矿东南部花岗岩进行单颗粒锆石的SHRIMPU_Pb年龄测定,结果为(297±3)Ma,是矿床成矿年龄的上限。

Geological characteristics and mineralization epoch of Weiquan silver (copper) deposit, Hami, Xinjiang, China

The Weiquan silver (copper) deposit found in 2000 is an independent silver deposit of meddle size, which is located in the south of Later Paleozoic Jueluotage island arc belt that belongs to the active belt of the north margin of Tarim plate. The host stratum is the shallow_sea facies of intermediate_acid and basic volcanic rocks, clastic rocks and carbonate rocks of the middle Carboniferous Tugutubulake Formation, and the host rock is the andradite skarn. The Weiquan deposit is a silver_polymetallic ore deposit far away from the intrusion. The zircon SHRIMP U_Pb age of the granite sample collected from the southeast of Weiquan deposit is of (297±3) Ma, which is considered to be the upper time limit of the metallogenic age.