马达加斯加Antanisoa石墨矿床成因分析

马达加斯加是世界优质大鳞片石墨矿重要产地之一,随着大鳞片石墨在诸多新兴领域发挥着越来越大的作用,对马达加斯加石墨矿床的研究显得越来越重要。矿床成因研究对石墨矿床的找矿勘查具有指导作用,然而目前关于马达加斯加石墨矿床的研究程度较低,人们普遍认为马达加斯加的石墨矿床是沉积变质成因。文章将Antanisoa石墨矿床作为研究对象,通过对矿区内石墨片岩的岩相学研究以及矿物化学特征研究,发现沉积变质成因的说法并不妥当。野外地质调查和岩相学研究显示出较多与流体充填有关的现象,矿物化学特征表明石墨片岩中与石墨共生的云母为金云母,浅色电气石为镁电气石。结合前人对马达加斯加岛地质背景研究结果与认识,认为马达加斯加Antanisoa石墨矿床更有可能与幔源流体充填有关,有待进一步研究。

Genetic analysis of Antanisoa graphite deposit in Madagascar

Madagascar is one of the important producing areas of high-quality coarse flake graphite deposits in the world. With the coarse flake graphite playing an increasingly more important role in many new fields, the research on the graphite deposits in Madagascar is becoming more and more important. The genetic study of the deposit is of guiding significance for the exploration of the graphite deposit. However, at present, the research on the Madagascar graphite deposits is still very insufficient. It is generally believed that the graphite deposits in Madagascar are of metamorphic origin and materials were derived from carbonaceous pelitic sediments. In this paper, Antanisoa graphite deposit was taken as the research object. Through the study of petrography and mineral chemistry characteristics of graphite schist in the mining area, it is found that the viewpoint of sedimentary metamorphism is not appropriate. Field geological observation and petrographic study show that there are many phenomena related to fluid filling, the mineral chemistry characteristics indicate that the micas in graphite schist are phlogopite and the light color tourmaline is dravite. Based on previous studies of the geological background of Madagascar, it is considered that the Antanisoa graphite geposit in Madagascar is more likely to be related to mantle-derived fluid filling, which needs further study.