内蒙古盘陀山-鹰嘴红山含钨花岗岩带形成时代及源区示踪  

Formation Age and Source Tracing of the Tungsten-Bearing Granite Belt in the Pantuoshan-Yingzuihongshan Area,Inner Mongolia

作　　者：杨合群[1] 赵国斌[1] 李文明[1] 杨建国[1] 李英[2] 王小红[1] 姜寒冰[1] 谭文娟[1] 

机构地区：[1]西安地质矿产研究所,西安710054 [2]长安大学,西安710054

出　　处：《地质与勘探》2010年第3期407-413,共7页Geology and Exploration

基　　金：国土资源大调查项目(1212010531602);资源潜力评价项目(1212010813036)资助

摘　　要：位于塔里木板块与哈萨克斯坦板块缝合带南侧被动陆缘隆起区的盘陀山-鹰嘴红山花岗岩带,赋存有盘陀山钨矿床-望旭山钨矿床-鹰嘴红山钨矿床。本文选择盘陀山和鹰嘴红山含钨花岗岩体,采用固体质谱稀释法进行锆石U-Pb法同位素测年,获得年龄值为373.8±1.6Ma～398.9±2.9Ma,确定形成时代为泥盆纪;同时测定花岗岩全岩Rb-Sr和Sm-Nd同位素组成,计算得(87Sr/86Sr)i值为0.722158～0.745368,εNd(t)值为-6.70552～-6.55118,根据(87Sr/86Sr)i值明显大于0.708和εNd(t)值远小于0,推断该带含钨花岗岩起源于古老陆壳物质的重熔。The Pantuoshan-Yingzuihongshan granite belt lies in the south of the suture zone between the Tarim plate and Kazakhstan plate,an uplift area in the passive continental margin,where the Pantuoshan tungsten deposit,Wangxushan tungsten deposit and Yingzuihongshan tungsten deposit are situated. The Zircon U-Pb dating of the Pantuoshan and Yingzuihongshan granites yields an age of 373.8±1.6 Ma～398.9±2.9 Ma,indicative of Devonian time. The Rb-Sr and Sm-Nd isotopic constituents of the whole rock have been measured,resulting in initial 87Sr/86Sr rations and εNd （t） values range between 0.722158～0.745368 and -6.55118～-5.88783,respectively. Because the initial 87Sr/86Sr ratios are considerably larger than 0.708 and εNd （t） values less than 0,it can be inferred that the tungsten-bearing granite belt originated from remelting materials in ancient continental crust.

关 键 词：含钨花岗岩 形成时代 源区示踪 盘陀山 鹰嘴红山 

分 类 号：P588.12[天文地球—岩石学] P581[天文地球—地质学]