文章摘要
龙 波.四川省同德石墨矿床地质特征及成因研究[J].地质与勘探,2023,59(5):1000-1016
四川省同德石墨矿床地质特征及成因研究
Geological characteristics and genesis of the Tongde graphite deposit in Sichuan Province
投稿时间:2022-03-05  修订日期:2022-10-21
DOI:10.12134/j.dzykt.2023.05.007
中文关键词: 晶质石墨 地质特征 成因 同德 四川省
英文关键词: crystalline graphite, geological characteristics, genesis, Tongde, Sichuan Province
基金项目:四川省政府性投资地质勘查项目“四川省攀枝花市仁和区同德石墨矿普查”(编号:DZ202104)与四川省自然资源科研项目“四川省晶质石墨成矿条件及分布规律研究”(编号:kj-2021-10)联合资助
作者单位E-mail
龙 波 四川省地质矿产勘查开发局一0六地质队四川成都 四川省战略矿产资源勘查利用研究院四川成都四川省国土科学技术研究院四川成都 1336361927@qq.com 
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中文摘要:
      四川省同德石墨矿床是近年来在扬子板块西缘发现的大型中-大鳞片晶质石墨矿之一。为研究同德石墨矿地质特征及矿床成因,本文采用系统的野外地质调查、地球物理与地球化学等方法,并开展山地取样工程、岩矿测试研究工作。研究认为:同德石墨矿产于古元古代前震旦系康定岩群冷竹关组变质岩层中,赋矿岩石为云母石英片岩。矿体主要呈层状、似层状近南北向展布。矿石矿物为石墨,脉石矿物主要为石英、白云母、黑云母、斜长石及少量铁质矿物等。矿石自然类型为云母石英片岩型,工业类型为中-大鳞片晶质石墨矿。其原岩为一套含碳质泥岩、泥质粉砂岩、砂岩;碳质主要来源为有机物。物探自然电位梯度呈正负相伴,最低电位和梯度值为零的位置往往指示了石墨矿体的顶面中心;音频大地电磁测深呈带状向深部延伸的低阻异常指示了石墨矿体的深部赋存形态。矿床的形成经历了沉积成岩-区域变质阶段,属沉积变质型矿床。
英文摘要:
      The Tongde graphite deposit in Sichuan Province, discovered in the western margin of the Yangtze Plate in recent years, is a large deposits with medium-large-sized crystalline graphite. This work conducted systematic field geological survey, geophysical and geochemical measurements, along with mountain sampling engineering, rock and ore testing research, to investigate the geological characteristics and genesis of the Tongde graphite deposit. The study shows that mica quartz schist serves as the host rock for the Tongde graphite deposit, which is found in the metamorphic rock strata of the Lengzhuguan Formation in the Paleoproterozoic pre-Sinian Kangding rock group. The ore body is mostly distributed in a roughly north-south orientation by layers and quasi-layers. The ore minerals are graphite, while the gangue minerals are mainly quartz, muscovite, biotite, plagioclase and a small amount of iron minerals. The natural type of ores is mica quartz schist type, while the industrial type is medium-large crystalline graphite ore. Its original rock is a set of carbonaceous mudstone, argillaceous siltstone and sandstone. Organic matter is the major source of carbon. The spontaneous potential gradient of geophysical prospecting is accompanied by positive and negative anomalies. The top center of a graphite ore body is frequently indicated by the position where the lowest potential and gradient values are zero in geophysical prospecting. A low resistivity anomaly of audio frequency magnetotelluric sounding that extends deep in a strip indicates the presence of graphite ore bodies in depth. The deposit, which is of the sedimentary metamorphic type, was formed after a period of sedimentary diagenesis and regional metamorphism.
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