| 西藏首例大型石墨矿床——青果矿床地质特征及含矿岩体U-Pb年龄 |
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| 引用本文： | 何亮,林彬,扎西平措,巴桑多吉,杜秋,邵锐,章奇志,何文革.西藏首例大型石墨矿床——青果矿床地质特征及含矿岩体U-Pb年龄[J].中国地质,2021,48(2):359-373. |
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| 作者姓名： | 何亮 林彬 扎西平措 巴桑多吉 杜秋 邵锐 章奇志 何文革 |
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| 作者单位： | 成都理工大学 地球科学学院, 四川 成都 610059;西藏自治区地质矿产勘查开发局第六地质大队, 西藏 拉萨 851400;中国地质科学院矿产资源研究所, 自然资源部深地资源成矿作用与矿产预测重点实验室, 北京 100037;拉瓦尔大学 地质与地质工程系, 加拿大 魁北克, G1V0A6 |
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| 基金项目： | 中国地质调查局项目（DD20160026、DD20160016、DD20190167）、西藏地勘局专项科研资金项目（藏地勘[2018]29号）、西藏自治区科技计划项目（XZ201901-GB-24）、中国地质科学院基本科研业务费项目（SYSCR2019-02）、国家重点研发计划-深地专项（2018YFC0604101）和国家自然科学基金项目（41902097）联合资助。 |
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| 摘 要： | 中国石墨矿产资源丰富,已有的勘查和研究成果多集中于中部、东部地区,而西藏地区石墨矿资源现状及找矿潜力并不清晰。随着矿产勘查工作的投入,在三江地区探获了西藏首例大型石墨矿床——青果石墨矿床。估算结果表明,青果石墨矿床资源量为106.94万t固定碳矿物量(333+334),平均品位8.40%。文章通过详细的野外地质调查及钻孔地质编录,查明青果矿床的基本地质特征;利用锆石U-Pb年代学分析,厘定其含矿岩体的成岩时代,并结合碳同位素组成,探究矿床成因及成矿时代。研究表明,青果矿床石墨主要呈球状、不规则粒状产于二长花岗岩中,矿体呈板状、不规则状,是二长花岗岩捕掳下石炭统卡贡组含煤地层在岩浆热液作用下重结晶的产物。含矿二长花岗岩锆石U-Pb年龄为(244.7±1.3)Ma,形成于中三叠世,代表了含矿岩浆活动的时限,也近似代表石墨成矿时代。区域上多个石墨矿床/点的发现,表明西藏三江地区具备较好的晶质石墨矿找矿潜力。
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| 关 键 词： | 晶质石墨矿 矿床地质特征 锆石U-Pb年龄 矿产勘查工程 青果 西藏 |
| 收稿时间： | 2019/11/12 0:00:00 |
| 修稿时间： | 2021/3/2 0:00:00 |
The first large-sized graphite deposit in Tibet: geology of the Qingguo graphite deposit and U-Pb age of its ore-bearing pluton |
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| HE Liang,LIN Bin,ZHAXI Pingcuo,BASANG Duoji,DU Qiu,SHAO Rui,ZHANG Qizhi,HE Wenge.The first large-sized graphite deposit in Tibet: geology of the Qingguo graphite deposit and U-Pb age of its ore-bearing pluton[J].Chinese Geology,2021,48(2):359-373. |
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| Authors: | HE Liang LIN Bin ZHAXI Pingcuo BASANG Duoji DU Qiu SHAO Rui ZHANG Qizhi HE Wenge |
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| Institution: | Chengdu University of Technology, Earth Sciences College, Chengdu 610059, Sichuan, China;No.6 Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 851400, Tibet, China;MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;Department of Geology and Geological Engineering, University Laval, QC G1V 0A6, Canada |
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| Abstract: | China is rich in graphite mineral resources, and the existing exploration and research results are mostly concentrated in the central and eastern regions. However, the present situation and prospecting potential of graphite mineral resources in Tibet are not clear. With the investment of mineral exploration work, the first large graphite deposit in the Sanjiang area of Tibet was discovered, namely the Qingguo graphite deposit. Its resource is 1.0694 million tons of fixed carbon minerals (indicated and inferred) at average grade of 8.40%. Through detailed field geological survey and borehole geological logging, the basic geological characteristics of the deposit have been clarified. The emplacement age of the ore-bearing pluton was determined by zircon U-Pb geochronology. Combined with the carbon isotopic composition, the genesis and metallogenic age of the deposit were studied. Orebodies in the deposits are hosted in a monzogranite pluton as thick tabular and irregular shape, and graphite is present as ball or irregular rains. These ore-bodies might be formed as the product of recrystallization during the magmatic hydrothermal activity when the coal-bearing strata of the Lower Carboniferous Kagong Formation were captured by monzogranite magma. The U-Pb age of ore-bearing monzogranite yielding (244.7±1.3)Ma indicates its emplacement during Middle Triassic, which represents the magmatic age and metallogenic age. The discovery of many graphite deposits and prospects in Tibet indicate that there is good exploration potential of graphite resources, especially in the Sanjiang area. |
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| Keywords: | graphite deposit mineral characteristics zircon U-Pb age mineral exploration engineering Qingguo Tibet |
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