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一 有一地区,在元古代绢云母绿泥石片岩层中,广泛分布着铀的弱矿化现象,矿化带断续出现,出露面积很广,局部有加富现象。 矿化带的岩性,不同于一般灰绿色的绢云母绿泥石片岩,而为黑色碳质片岩。色深黑,污手,风化后成黑土,以此可与一般片岩分开,成为显著之找矿标志。黑色片岩,走向东西,倾向或南或北,倾角30—40°不等;和绢云母绿泥石片岩分层界限极不明显,为渐变关系;或成长透镜体状,或成层状,一至三层不等,反映了原沉积时物质成分在垂直及水平方向上的不均匀相变,黑色片岩富碳质,变质后成为细小之石墨鳞片,局部变质较深时,接近石墨片岩,除零星散点外,见到黄铁矿晶粒较少。
In one area, in the Proterozoic sericite chlorite schist layers, the uranium weak mineralization is widely distributed. The mineralization belt appears discontinuously, and the exposed area is very wide and locally enriched. The lithology of the mineralization zone is different from the general gray-green sericite schist, which is black carbonaceous schist. Color dark, dirty hands, weathered into black soil, which can be separated from the general schist, become a significant sign of prospecting. Black schist, to something, or south or north, dip angle of 30-40 °; and sericite chlorite schist stratification is extremely obvious, for the gradual relationship; or growth lens shape, or layered, one to The three layers are different, reflecting the heterogeneous phase transition of the material composition in the vertical and horizontal directions during the original sedimentation. The black schist becomes carbon-rich and becomes a fine graphite flake after metamorphism. When the local metamorphism is deeper, it approaches the graphite schist, Scattered outside, see fewer grains of pyrite.