广西下雷锰矿区定量岩相图编制及其意义

Compilation and Geological Implication of the Quantitative Lithofacies Map of Xialei Manganese Deposit,Guangxi Province

以广西下雷锰矿区为例,通过对大量钻孔剖面资料进行整理、分析和统计,提取出锰矿区矿层数、矿层累计厚度、夹石累计厚度、矿层顶板厚度、矿层底板厚度等5类成矿参数,给出了岩相图编制的详细步骤,进而编制出定量岩相图、成矿参数等值线图。以岩相图为基础,结合上述5类成矿参数,对岩相分布、岩石组合特征与锰成矿之间的关系进行分析。结果表明,矿层数最多、矿层累计厚度最大、夹石累计厚度最大、矿层顶板厚度最大、矿层底板厚度最大的矿段主要分布于硅质岩相区;锰成矿主要受控于硅质岩相,硅质岩类的岩石组合特征控制了锰矿的沉积背景,锰矿主要沉积于深水宁静环境中。

Taking the Xialei manganese deposit in Guangxi province as the research object,the large amount of the drilling data is sorted,analyzed and counted so as to obtain the five types of ore-forming parameters such as the number of seam,cumulative seam thickness,cumulative stone thickness,seam roof thickness,and seam floor thickness. The compilation process of lithofacies map is given in detail,and then,the lithofacies map and ore-forming parameters contour map are compiled. Based on the lithofacies map,the relationship between the characteristics of lithofacies distribution and rock association and the oreforming process of manganese are analyzed. The results show that,the siliceous rock blocks usually owns the maximum number of seam,cumulative seam thickness,cumulative stone thickness,seam roof thickness and seam floor thickness; Manganese ore is mainly controlled by the siliceous rocks,and the sediment background of manganese ore deposit is controlled by the siliceous rock combination features. Manganese ore is mainly deposited in the environment of deepwater and tranquility.