| 西藏墨竹工卡县甲马多金属矿床几组年龄数据的比较与成因研究 |
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| 引用本文： | 李胜荣,袁万明,屈文俊,邓军,侯增谦.西藏墨竹工卡县甲马多金属矿床几组年龄数据的比较与成因研究[J].岩石学报,2008,24(3). |
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| 作者姓名： | 李胜荣 袁万明 屈文俊 邓军 侯增谦 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083 |
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| 基金项目： | 国家重点基础研究发展规划项目
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国家自然科学基金项目
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中国地质调查局地质大调查项目 |
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| 摘 要： | 甲马矿床是西藏腹地冈底斯带已投入开采的大型多金属矿床,有关其成因的研究直接影响着该带多金属矿床的区域找矿方向及对冈底斯带地球动力学过程的成矿效应研究.目前对该矿床成因尚无统一的认识,关键在于未获得成矿年龄的可靠结果.本文比较了前人和本文获得的Rb-Sr(260Ma和54Ma)、裂变径迹(>25～22Ma)和Re-Os(模式年龄15.4～15.5Ma,等时线年龄15.18Ma和模式年龄15.23～15.62Ma,等时线年龄15.41Ma)等年龄数据,认为Re-Os同位素年龄数据最为可靠,应作为矿床的成矿年龄.矿床Re-Os同位素年龄与矿区外围花岗闪长斑岩全岩K-Ar同位素年龄一致,显示甲马夕卡岩及其中的多金属矿床为斑岩-多底沟组灰岩接触带岩浆热液交代-充填成因,该矿床属冈底斯中段的后碰撞岩浆热液成矿系统.预计该区深部及外围存在斑岩型-夕卡岩型-脉型含金多金属矿化.
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| 关 键 词： | Rb-Sr Re-Os 裂变径迹 多金属矿床 甲马 西藏 |
Comparation of several sets of age data and the origin of the Jiama polymetallic ore deposit in Mozugongka County, Tibet |
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| LI ShengRong,YUAN WanMing,QU WenJun,DENG Jun,HOU ZengQian.Comparation of several sets of age data and the origin of the Jiama polymetallic ore deposit in Mozugongka County, Tibet[J].Acta Petrologica Sinica,2008,24(3). |
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| Authors: | LI ShengRong YUAN WanMing QU WenJun DENG Jun HOU ZengQian |
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| Institution: | LI ShengRong~1 YUAN WanMing~1 QU WenJun~2 DENG Jun~1 HOU ZengQian~3 1.State Key Laboratory of Geological Processes , Mineral Resources,China University of Geosciences,Beijing 100083,China 2.China National Research Center of Geoanalysis,Beijing 100037,china 3.Institute of Geology,Chinese Academy of Geological Sciences,China |
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| Abstract: | The Jiama ore deposit is a large scaled polymetallic deposit being mined in the Gongdese metallogenic belt of the central Tibet.The ore is hosted by garnet-diopside-tremolite skarn without spatial contact to igneous rocks.The origin of the deposit is a key factor affecting the regional prospecting of polymetallic ore deposits in the belt,and it's also essential to the study of mineralization effect of the geodynamic evolution of the belt.Until now there are still no commonly accepted opinion with regard the... |
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| Keywords: | Rb-Sr isotope Re-Os isotope Apatite fission track Poly-metallic ore deposit Jiama Tibet |
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