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| 基金项目：国家科技攻关项目、科技支撑项目“西部优势矿产资源潜力评价技术及应用研究”(2006BAB01A01)，中国地质调查局国土资源大调查项目“全国重要矿产总量预测”(1212010633905;1212010733806;1212011121040)、“全国矿产资源潜力动态评价” (121201103000150003) |
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| 摘要： |
| 南江县尖山石墨矿位于扬子陆块区之上扬子古陆块之米仓山—大巴山基底逆冲带之米仓山基底逆冲带龙门山—大巴山成矿带，其矿床成因存在争议。在野外实地研究和镜下观察的基础上，结合前人研究成果可知，尖山石墨矿含矿建造为碳酸盐岩建造，变质作用为区域变质作用和接触变质作用。石墨矿主要赋存于中元古代火地垭群麻窝子组下段（Pt2mw1）上部的含石墨角砾岩中，矿体呈层状产出。含矿岩石类型为含石墨角砾岩型、石墨片岩型和含石墨大理岩型，显微观察多为细粒微晶石墨，并有少量黄铁矿和黄铜矿伴生；石墨鳞片片径多小于0.05 mm，矿石品位为5%～40%。通过对尖山石墨矿床地质特征的研究以及与其他石墨矿床成因的对比，发现其矿床成因类型应为区域变质-接触变质复合型。 |
| 关键词：石墨 地质特征 矿床成因 四川南江 |
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| Abstract: |
| The Jianshan graphite deposit is located at the thrust belt of Micangshan basement, the thrust belt of Micangshan-Dabashan basement, Upper Yangtze Block, Yangtze Block. And it is in the metallogenic belt of Longmen-Daba Mountains. Its genesis was controversial. Based on field research, microscopic observation and previous studies, it is found that its ore bearing formation is carbonate, its metamorphism is regional metamorphism and contact metamorphism. The graphite minerals are mainly bedded in the graphite bearing breccia of the upper part of Lower Mawozi Formation, Mesoproterozoic Huodiya Group. The ore types are graphite-bearing breccia, graphite schist and graphite bearing marble. Microscopic observation finds that the ore is fine microcrystalline, and associated with a small amount of pyrite and chalcopyrite. The scales of graphite mineral are less than 0.05 mm, the ore content is 5%～40%. The Jianshan graphite deposit genesis is found to be composite of regional metamorphism and contact metamorphism, with analysis of the geological characteristics and comparison with other graphite deposits genesis. |
| Keywords:graphite geological characteristics ore genesis Nanjiang in Sichuan |
| 夏锦胜，孙莉，肖克炎.四川南江尖山石墨矿床地质特征及成因[J].地质学刊,2017,41(2):212-217 |
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