贵州寒武系底部黑色岩系型矿床沉积构造特征研究

Primary Study on the Sediment Structures in Black-shale-series Deposits of the Basal Cambrian,Guizhou Province

在中国南方地区早寒武世广泛分布着一套黑色岩系型矿床,其矿物组成和沉积地球化学都表现出明显的热水沉积特征,该黑色岩系沉积构造方面的研究却很少。通过对贵州寒武系底部3个不同黑色岩系型矿带Ni-Mo多金属成矿带、V成矿带、重晶石成矿带的宏观和微观构造的研究,总结了其沉积构造特征,发现其中存在大量类喷溢和喷流过程形成的沉积构造、气-水热液作用形成的沉积构造、胶体及生物化学沉积构造、准同生变形构造等沉积构造和沉积构造序列,分析了不同成矿带之间的沉积构造异同,这对该类型矿床成矿理论的研究具有重要意义。

Black-shale-series deposits related to hydrothermal sedimentation were widely distributed in the basal Cambrian,southwest of China.According to the study on micro and macro structures of three different types of black-shale-series deposit belts,namely Ni-Mo ore deposit belt,V ore deposit belt and barite deposit belt,sedimentary structural features are concluded.Specifically,sedimentary structures and structures series that formed in extravasation,in pneumato-hydrothermal process and in colloidal-biochemical process,as well as some penecontemporaneous sedimentary structures,were found and determined.As a result,comparison analysis was made on the differences and similarities of the sedimentary structures among those three deposit belts,which is of importance for mineralization theories related to deposits of this type.