新疆双峰山浅成低温热液金矿床特征与成矿机制  

THE GEOLOGIC FEATURES AN D METALLOGENIC MECHANISM OF EPITHERMAL GOLD DEPOSIT IN SHUANGFENGSHAN, XINJIANG

作　　者：郦今敖[1] 莫江平[1] 彭晓明 席小平 王正云[1] 三金柱 

机构地区：[1]桂林矿产地质研究院,广西桂林541004 [2]新疆维吾尔自治区有色地勘局704队,新疆哈密839000

出　　处：《新疆地质》2004年第2期164-169,共6页Xinjiang Geology

基　　金：95国家科技攻关项目(969150503)资助

摘　　要：双峰山矿床位于新疆东天山北部西伯利亚板块陆缘晚古生代岛弧南部边缘,靠近克拉麦里板块缝合带,该矿区早石炭世浅海相玄武-安山质熔浆喷溢转为陆相流纹质熔浆喷发初期,火山热泉沿NW-NWW向线形管道(F_2)形成以低Au品位硅质岩为中心的蚀变矿物晕(带);火山间隙性隐爆,潜火山热液于硅质岩裂隙间发育微细石英(冰长石)网脉,构成矿体,这两个成矿阶段同源同位的蚀变矿物晕(带)套叠,显示双峰山矿床蚀变分带与成矿模式,从上至下为隐爆硅质角砾岩化带、低Au品位硅质岩化带、石英(冰长石)网脉带(矿体)、黄铁矿蒙脱石化带和青磐岩化带,铅、硫同位素和稀土元素等研究表明,该矿床成矿流体与晚古生代岛弧早石炭世流纹质熔浆的陆相喷发相联系;火山热泉循环形成蚀变晕阶段加入大气降水,潜火山热液成矿阶段发育的低温微细石英网脉含冰长石和绢云母,它是一处晚古生代火山地区冰长石-绢云母型浅成低温热液金矿床。Shuangfengshan gold deposit located in north of East Tianshan, Xingjiang occurring along the edge of late Pateozoic arc-islands of the continental margin of Siberia plate, near Kalamaili plate suture. At the beginning of transforming from the flooding of shallow-sea basalt-andesite to the eruption of continental rhyolitic lava in early Carboniferous, volcanic hot spring formed a alternation mineral zone which center is consist of low grade gold-bearing silica rock along the NW-NWW linear pipe. Volcanic intermittent cry(?)oexplosion developed. Subvolcanic hydrothermal quartz(adular) veinlet occurs along the fractures in silica rock and formed orebodies. The overprinting of two isogenous, homothetic ore forming stage alteration appeared in Shuangfengshar gold deposit and formed orderly silica breccia zone, low gold grade silica rock zone, quartz (adular) veinlets zone (ore body), pyrite montmorillonite zone and propylitic zone from upside to underside. The results oflead and sulphur iso(?)ope, REE analysis suggested that source of the ore-forming fluid is related to the continental rhyolitic lava eruption of arc volcanic activity in late Paleozoic (early Carboniferous). During the circulating of volcanic hot spring, atmosphere water was added and alternation zone formed. Subvolcanic hydrothermal fluid resulted in the forming of tiny quartz stockworks with adular and sericite. Shuangfengshan gold deposit is a epithermal gold deposit containing adular and sericite which formed in late Paleozoic volcanic area.

关 键 词：浅成低温热液金矿床 蚀变 火山 晚古生代 硅质岩 成矿阶段 岛弧 长石 矿体 品位 

分 类 号：P618.51[天文地球—矿床学]