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。
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 type is regional metamorphism type.The industrial type of ores 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 indicates 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,and were further enriched and mineralized under the action of migmatization and deep ductile shearing.
作者
马金虎
刘阳
马晓辉
提云生
马玉伟
赵淦
张向宁
张健
李艳翔
赵亮
MA Jinhu;LIU Yang;MA Xiaohui;TI Yunsheng;MA Yuwei;ZHAO Gan;ZHANG Xiangning;ZHANG Jian;LI Yanxiang;ZHAO Liang(Hebei Geological Engineering Survey Institute,Baoding,Hebei 071051;Institute of Mineral Resources Research of China Metallurgical Geology Bureau,Beijing 101300;Geophysical Exploration Institute of China Metallurgical Geology Bureau,Baoding,Hebei 071051)
出处
《地质与勘探》
CAS
CSCD
北大核心
2020年第4期878-888,共11页
Geology and Exploration
关键词
地质特征
矿床成因
主量元素
区域变质型
石墨矿
马达加斯加
geological features
ore genesis
major element
regional metamorphic type
graphite deposit
Madagascar
