应用地球化学块体方法圈定勐贡地区找矿靶区并估算其资源潜力

发布时间：2018-09-17 19:54

【摘要】：地球化学块体理论从提出至今,虽然它的发展历史仅仅有二十多年历史,但是它在基础理论研究及矿产勘查方面具有重大的意义。一方面,它从物质供应量的角度出发区别了巨型矿床与一般矿床,使地质学家们的视野得到开阔,奠定了其它地质学科发展的基础;另一方面,块体理论在资源量预测、成矿潜力分析方面的应用,有利于缩小找矿靶区,在研究程度较低的研究区内实现找矿突破。研究区地处保山-镇康地块构造单元南段,是三江特提斯构造带的重要组成部分,区内各类矿产资源丰富,其中,芦子园Cu-Pb-Zn-Fe矿多金属矿床已达超大型规模。但由于该区的矿矿产勘查工作起步最晚,仅有少数几个矿床处在普查、详查阶段,具有较大的找矿潜力。故本文以研究区土壤地球化学数据为基础,运用地球化学块体的技术方法,圈定了研究区的地区化学块体,绘制了块体图,通过追踪元素逐步富集的趋势,实现对研究区内的成矿预测;并进一步对该区的成矿元素资源量、潜在资源量进行了计算,定量的评估了块体的成矿潜力。本文首先对数据进行因子分析,将12种元素分为3种元素组合,结合研究区实际情况,确定Pb、Zn为研究区的成矿元素;然后迭代剔除3倍方差以外的离群点,得到成矿元素Pb、Zn的异常下限,并将块体分为6个级次,求得每个级次的分级值;再根据划分的分级级次,绘制了地球化学块体图和谱系树,追踪元素逐步富集的趋势,对研究区成矿潜力进行定性的预测;最后,根据已探明的矿床的资源量,计算了成矿率。对研究程度较低的其他块体进行资源量、潜在资源量的预测,定量的评估了块体的成矿潜力,确定了找矿远景区。本论文所做工作,有利于缩小研究区的找矿靶区,指导研究区内矿床的寻找。
[Abstract]:Geochemical block theory is of great significance in basic theoretical research and mineral exploration, although it has only a history of more than 20 years since it was put forward. On the one hand, it distinguishes giant deposits from general deposits from the point of material supply, which broadens the horizons of geologists and lays the foundation for the development of other geological disciplines; on the other hand, block theory predicts the amount of resources. The application of metallogenic potential analysis is helpful to narrow down the prospecting target area and to realize the ore prospecting breakthrough in the research area where the degree of research is low. The study area is located in the southern section of the structural unit of Baoshan-Zhenkang block. It is an important part of the Sanjiang Tethys tectonic belt and is rich in all kinds of mineral resources. Among them, the Cu-Pb-Zn-Fe ore deposit of Luziyuan has reached a very large scale. However, only a few ore deposits in this area are in the stage of general survey and detailed investigation, which has great prospecting potential because of the late start of mineral exploration work in this area. Therefore, based on the soil geochemical data of the study area, using the technical method of geochemical block, this paper delineates the regional chemical block in the study area, draws the block map, and by tracing the trend of gradual enrichment of elements, The metallogenic potential of the block is evaluated quantitatively by further calculation of the metallogenic element resources and potential resources in the study area. In this paper, the data are first analyzed by factor analysis, 12 elements are divided into 3 kinds of element combinations, and Pb,Zn is determined to be the ore-forming element in the study area, and then the outliers other than 3 times variance are eliminated iteratively. The anomalous lower limit of metallogenic element Pb,Zn is obtained, and the block is divided into 6 stages, and the classification value of each grade is obtained, and the geochemical block map and pedigree tree are drawn according to the classification order, and the trend of element enrichment is traced. The metallogenic potential of the studied area is predicted qualitatively, and finally, the metallogenic rate is calculated according to the resource quantity of the proved ore deposit. The resources and potential resources of other blocks with low degree of study were forecasted, the ore-forming potential of blocks was evaluated quantitatively, and the prospecting prospect was determined. The work done in this paper is helpful to narrow down the ore-prospecting target in the research area and to guide the prospecting of the ore deposit in the research area.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P632

【参考文献】