| 马达加斯加石墨矿地质特征及其成因分析 |
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| 引用本文： | 马金虎.马达加斯加石墨矿地质特征及其成因分析[J].地质与勘探,2020,56(4):878-888. |
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| 作者姓名： | 马金虎 |
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| 作者单位： | 河北省地质工程勘查院，河北保定； 中国冶金地质总局矿产资源研究院，北京 101300； 中国冶金地质总局地球物理勘查院，河北保定 |
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| 摘 要： | 马达加斯加石墨矿资源丰富,找矿潜力大。对马达加斯加东部及西南部3个典型石墨矿床进行综合对比研究,发现其石墨矿成因类型为区域变质型,矿石工业类型以大鳞片晶质石墨为主,自然类型可分为片岩型、片麻岩型及变粒岩型,石墨矿赋矿地层为Graphite岩系。对含矿岩石进行主量元素分析,认为其原岩为富含有机质、富铝的砂质、粉砂质、泥质沉积碎屑岩;形成环境为活动大陆边缘区域和大陆岛弧区域。马达加斯加石墨矿床的形成均经历了多次变质作用,富含有机质岩石主要通过区域变质作用形成晶质石墨矿床,并在混合岩化及深层次韧性剪切作用下进一步富集成矿。
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| 关 键 词： | 地质特征 矿床成因 石墨矿 马达加斯加 |
| 收稿时间： | 2020/3/31 0:00:00 |
| 修稿时间： | 2020/7/3 0:00:00 |
Geological characteristics and genetic analysis of graphite deposits in Madagascar |
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| Ma Jinhu.Geological characteristics and genetic analysis of graphite deposits in Madagascar[J].Geology and Prospecting,2020,56(4):878-888. |
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| Authors: | Ma Jinhu |
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| Abstract: | Madagascar is rich in graphite resources and has great prospecting potential. A comprehensive comparative study of three typical graphite deposits in eastern and southwestern Madagascar suggests that the genetic types are sedimentary metamorphism type. The industrial type of ore is mainly large scale crystalline graphite, and the natural types can be divided into schist type, gneiss type and granulite type. The host stratum of the graphite deposit is the Graphite series, Analysis of major elements in ore-bearing rocks, It is considered that the protolith is Sandy, silty and argillaceous sedimentary clastic rock rich in organic matter and aluminum. The forming environment is active continental margin area and Continental Island Arc area. The formation of graphite deposits in Madagascar has undergone many times of metamorphism. The organic-rich rocks formed crystalline graphite deposits through regional metamorphism. It is further enriched and mineralized under the action of migmatization and deep ductile shearing. |
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| Keywords: | geological features ore genesis graphite deposit Madagascar |
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