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西藏班公湖-怒江结合带中段去申拉组火山岩年代学及勘查找矿方向
引用本文:邓世林,林彬,张海潮,阿旺仁增,王腾,胡志中,邹兵,张忠坤,杨征坤,刘振宇.西藏班公湖-怒江结合带中段去申拉组火山岩年代学及勘查找矿方向[J].地球科学,2020,45(3):776-788.
作者姓名:邓世林  林彬  张海潮  阿旺仁增  王腾  胡志中  邹兵  张忠坤  杨征坤  刘振宇
作者单位:1.四川省冶金地质勘查局六○五大队, 四川眉山 620860
基金项目:中国地质调查局二级项目DD20160026中国地质调查局二级项目DD20160026国家重点研发-深地专项2018YFC064101中国地质科学院基本科研业务费SYSCR2019-02西藏自治区科技计划项目XZ201901-GB-24国家自然科学基金项目41902097
摘    要:作为班公湖-怒江结合带最为重要的火山岩沉积地层之一,去申拉组一直缺乏精细的年代学研究和找矿潜力的分析.基于班-怒结合带中段尼玛县北部长期的矿产地质调查工作,对热过勒、饿蒙勒、阿俄作登等地区的去申拉组进行了详细解剖,并利用锆石U-Pb定年精细厘定区内去申拉组中英安岩、安山岩的结晶时限分别为106.2±1.3 Ma、107.7±1.4 Ma,属于早白垩世火山活动的产物.同时,区内1:5万水系沉积物异常以及实地调查揭示,阿俄作登和饿蒙勒地区存在良好铜、金、银组合异常,初步揭露1条高品位的矿化体.结合区域成矿作用背景分析,认为该区存在良好的斑岩-浅成低温热液型铜多金属成矿系统的找矿潜力.班公湖-怒江结合带去申拉火山沉积地层的形成时限的精确厘定,为区域基础地质格架的构建提供了直接证据;而其矿化信息的首次揭露,为该带早白垩世大面积覆盖的火山岩地区的勘查找矿工作指明了新方向. 

关 键 词:去申拉组    地质年代学    斑岩-浅成低温热液    班公湖-怒江结合带    西藏
收稿时间:2018-11-19

Geochronology and Ore Prospecting Potential of Qushenla Formation in Middle Segment of Bangong Co-Nujiang Suture Zone,Tibet
Abstract:The Qushenla Formation is one of the most important volcanic strata in Bangong Co-Nujiang suture zone, however, there is no detailed geochronology and prospecting potential study. Based on long-term ore geological survey in Nima County, we do a detailed study on the Qushenla Formation in Reguole, Emengle, Aezuodeng areas, and date the dacite and andesite in Qushenla Formation with U-Pb age of zircons. They are 106.2±1.3 Ma and 107.7±1.4 Ma, respectively, as the result of Early Cretaceous magmatism. At the same time, good Cu, Au, Ag anomalies and one high-grade copper-bearing mineralized body were found in Aezuodeng and Emengle areas, according to the 1:50 000 stream sedimentary analysis. Given the regional metallogenic background, we suggest this area is a good prospecting target for porphyry-epithermal copper system exploration. The precise geochronology of Qeshenla Formation gives the direct evidence for the framework building of regional strata. The first discovery of the mineralization in Qushenla Formation reveals a new direction for the further exploration and prospecting in the large area of the Bangong Co-Nujiang suture zone covered volcanic rocks. 
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