摘要
煤系石墨是亟须开发利用的重要煤系矿产,然而对其在成矿过程中不同显微组分的差异石墨化研究的缺失妨碍了开发利用.本文通过选取中国代表性煤系石墨矿床,构建完整的石墨变质程度梯度序列,借助扫描电镜、偏反光显微镜、显微拉曼光谱研究不同显微组分在天然石墨化中显微岩石学和拉曼谱学变化.结果表明,煤系石墨的显微组分包括煤显微组分、新生显微组分、石墨微晶.煤显微组分包括镜质组与惰质组.新生显微组分包括热塑性镜质体、斑点组分、液相结晶焦、热解炭等.石墨微晶包括基质石墨、片状石墨、致密结晶石墨.石墨化机制包括固相、液相与气相石墨化.
Abstract
The coal-based natural graphite is an important coal-based mineral resource that needs to be developed and utilized urgently.However,the lack of research on the differential graphitization of different maceral components in the mineralization process has hindered its development and utilization.In this paper,we have constructed the complete graphite metamorphic gradient sequence based on the study of selected representative coal-based natural graphite deposits in China.By using the scanning electron microscope,polarized and reflective microscope,and Raman spectroscopy,we have studied the micro-petrological and Raman spectroscopic changes of different macerals in the natural graphitization process.The results show that the macerals of coal-based natural graphite include primary macerals,transient micro-components,and graphite microcrystals.The primary macerals include vitrinite and inertinite,with no liptinite.The transient micro-components include thermoplastic vitrinite,mosaic components,liquid-phase crystalline carbon,and pyrolytic carbon.Graphite microcrystals include matrix graphite,flake graphite,and compact crystalline graphite aggregates.Different graphitization mechanisms include solid-phase graphitization,liquid-phase graphitization,and gas-phase graphitization.
维普
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