广西大厂李家坳铅锌矿区土壤地球化学特征及找矿预测

发布时间：2018-03-21 09:34

本文选题：李家坳铅锌矿床　切入点：大厂矿田　出处：《昆明理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：研究区位于丹池成矿带的中段,靠近大厂矿田东北部边缘。研究区勘查工作程度还不够充分,需结合前人研究成果,进行土壤地球化学测量工作；研究指示元素的土壤地球化学异常特征,结合研究区地质特征并进行异常的合理解释与评价,圈定找矿远景区,缩小找矿范围。本文分析了研究区土壤13种元素的基本统计特征。Au、Ag、Cu、Pb、Hg、Bi、Sn、Zn、 As、Sb元素次生富集倾向明显；Ag、As、Sb、Cd、Mo元素在土壤中分布极不均匀,呈现强分异特征；这是成矿关系密切的地球化学条件。通过迭代法计算出13种元素的异常下限并绘制单元素异常图；可以看出,各元素异常浓度分带不均匀,异常规模差异大。其中Sn、Mo、As、Bi元素异常个数较多,Ag、Pb、Sn、 Mo、As、Sb元素异常达到三级浓度分带,Pb、Sn、Mo、Bi元素异常规模较大,Ag、Cu、Pb、 Zn、Sn、W、As、Sb、Bi元素次生晕套合较好。运用SPSS软件中的多元统计分析,研究元素的共生组合特征,最终得到综合元素异常图,为圈定找矿远景区提供了主要依据。通过相关分析表明：Pb、Zn、Sn、Bi、Sb、Cd、Ag相关性显著。通过聚类分析表明：Pb、Ag、Zn、Cd、Sb、Bi、Sn、As是一类中-低温元素组合,也是主要成矿元素在表生环境下的次生富集组合。通过因子分析表明：F1因子(Zn-Cd-Bi-Sb)是研究区最重要的次生富集元素组合；F2因子(Pb-Ag)为研究区次要的次生富集元素组合。比对相关分析、聚类分析及因子分析结果,研究区具有两种重要的元素组合类型,即Zn-Cd-Bi-Sb是研究区最为重要的成矿元素组合,Pb-Ag是研究区较为次要的成矿元素组合。对研究区的控矿构造进行解析,发现研究区的应力集中区主要分布在断层两侧及尖端,同时褶皱核部也存在应力集中区；褶皱核部和断层附近具备较好的裂隙发育条件。良好的裂隙发育条件是一个非常重要的找矿标志通过探讨研究区“喷流热水沉积+后期热液改造”的矿床成因,据研究区成矿有利因素分析,结合矿化体产出情况、探矿工程控制情况,研究区共圈出四个找矿远景区,其中一级远景区A1、A2、A3,二级远景区B1。其中A1、A3是下一步重点找矿区域。
[Abstract]:The middle section of Yu Dan pool metallogenic belt is near the northeast edge of Dachang Orefield. The degree of exploration in the study area is not enough, so it is necessary to carry out soil geochemistry survey combined with previous research results. This paper studies the characteristics of soil geochemical anomalies of indicator elements, combines the geological characteristics of the study area and makes rational interpretation and evaluation of the anomalies, and delineates the prospecting areas. In this paper, the basic statistical characteristics of 13 elements in the soil of the study area. The basic statistical characteristics of 13 elements in the soil. This is a geochemical condition closely related to mineralization. By iterative method, the anomalous lower limit of 13 elements is calculated and the anomalous map of single element is drawn. It can be seen that the anomalous concentration of each element is not uniform. There is a great difference in the scale of anomalies, among which the number of anomalies in the elements of Sno, Mo-Mo-As-Bi is more than that of Ag-Pb-PbPb, and the anomaly of Mo-As-Sb reaches the third-order concentration zonation. The scale of the anomalies is larger than that of Ag-Cu-Pb, and the SPSS software is used for the multivariate statistical analysis of the secondary halos of the elements, and the results are as follows: (1) in this paper, the results are as follows: 1. By studying the symbiotic assemblage characteristics of the elements, the Synthetical element anomaly map is obtained, which provides the main basis for the delineation of the ore-prospecting distant areas. The correlation analysis shows that there is a significant correlation between the SbCU and the SbSbSbCCDO Ag. By cluster analysis, it is shown that the component of the SbSbSbSbSbSbSbSbSbONAs is a kind of middle-low temperature element assemblage. It is also the secondary enrichment assemblage of the main ore-forming elements in the supergene environment. The factor analysis shows that Zn-Cd-Bi-Sb) is the most important secondary enrichment element assemblage in the study area, and that F _ 2 factor Pb-Agis the secondary secondary enrichment element assemblage in the study area. The results of cluster analysis and factor analysis show that there are two important types of element assemblages in the study area, namely, Zn-Cd-Bi-Sb is the most important assemblage of metallogenic elements in the study area, Pb-Ag is the less important combination of metallogenic elements in the study area, and the ore-controlling structure in the study area is analyzed. It is found that the stress concentration zone in the study area is mainly located on both sides of the fault and the tip of the fault, and there is also a stress concentration zone in the core of the fold. There are good fracture development conditions in the core of fold and near faults. Good fracture development condition is a very important ore prospecting marker. By discussing the genesis of "hydrothermal reformation in the late stage of exhalation hot water deposition" in the study area, According to the analysis of metallogenic favorable factors in the study area, combined with the orebody production and the control of prospecting engineering, four ore prospecting areas have been formed in the study area, among which A _ 1, A _ 2, A _ (3) and B _ (1), A _ (1) A _ (3) are the next important prospecting areas.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.4

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