西藏安多县巴布茸西铅锌矿土壤地球化学特征及成矿预测

发布时间：2018-08-16 07:39

【摘要】：西藏安多县巴布茸西铅锌矿多金属调查评价区位于沱沱河整装勘查区的多才玛—布玛浪纳铅锌铜钼成矿带内,该成矿带现已发现多个矿床点。巴布茸西地质背景与成矿带内已发现的矿床点具有类似的地质背景,因此有着非常好的找矿潜力。本论文在地质调查、物探和化探的基础上,参照区域地质特征,结合研究区内的地质背景以及自然地理条件,并广泛阅读了相关文献,取得了以下主要成果和结论:对土壤化探数据进行初步处理,得到以下认识:As、Sb、Pb、Cd等4种元素的丰度系数大于2,说明这4种元素在研究区内富集程度较高,有着比较好的成矿前景;Ag、Pb等2种元素的变异系数大于1,说明这2种元素在研究区内分布越不均匀,离散程度很高,越有可能局部富集,并形成矿床;偏度系数及峰度系数显示研究区内的9个元素不符合正态分布,说明它们的异常成因类型受到多个地质事件的影响。利用多元统计学方法,如相关分析、聚类分析和因子分析,对原始数据进行了分析处理,结果表明:Pb—Sb—As—Zn—Cd作为一个主因子元素组合,在研究区中套合较好,具有共生或伴生关系,成矿前景良好;球形检验统计量的结果,以及旋转因子载荷图都印证了以上多元统计分析结果的一致性和可靠性。根据本次土壤地球化学测量结果,采用迭代法确定本区背景值和异常下限,并编制地球化学异常图,绘制出西藏安多县巴布茸西调查评价区单元素异常图9幅,圈定单元素异常共15个,其中3个Pb异常和7个Ag异常;Pb元素和Ag元素具有明显的浓集中心,异常值很高,指示成矿。根据单元素异常分析和评价结果,绘制化探综合异常图,圈出多元素组合异常9个,其中乙类异常3个,丙类异常6个。另外,对研究区的物探激电中梯结果做出分析,主要根据视极化率异常圈定异常带3个,编号分别为JD1、JD2及JD3激电异常,推测均为断层作用下以Ag、Pb为主的硫化物进一步富集引起。研究区没有岩浆岩出露,也未发现断层和褶皱构造,围岩蚀变矿化较弱,褐铁矿化纵贯研究区,而且两侧分布多个化探异常区,推测褐铁矿化是该区的找矿标志。综合分析该研究区的地质资料,并结合本次土壤地球化学异常调查和激电中梯的成果,再参考褐铁矿化带的位置,笔者在研究区中部偏南位置圈定了一个Ag、Pb为主元素的成矿预测区,并初步分析引起物化探异常的成因,为进一步的找矿工作做参考,具有一定的理论意义和实用的找矿价值。
[Abstract]:The polymetallic investigation and evaluation area of Babuyongxi Pb-Zn ore deposit in Ando County, Tibet is located in the Docai Ma Brana Pb-Zn Cu Mo metallogenic belt in the Tuotuo River integrated exploration area. Many ore deposit sites have been found in this metallogenic zone. The west geological setting of Babu Anong has a similar geological background to the deposit sites found in the metallogenic belt, so it has very good prospecting potential. On the basis of geological survey, geophysical exploration and geochemical exploration, this paper, referring to the regional geological characteristics, combined with the geological background and natural geographical conditions in the study area, has read the relevant literature extensively. The main results and conclusions are as follows: the preliminary processing of the geochemical data of soil shows that the abundance coefficient of the four elements, such as SbPbN, CD and so on, is greater than 2, which indicates that the enrichment degree of these four elements is high in the study area. The coefficient of variation of the two elements is greater than 1, which indicates that the more uneven the distribution of the two elements in the study area, the higher the degree of dispersion, the more likely they are to be locally enriched and to form a deposit. The skewness coefficient and kurtosis coefficient show that the nine elements in the study area do not conform to the normal distribution, indicating that their anomalous genetic types are affected by many geological events. By using multivariate statistical methods, such as correlation analysis, cluster analysis and factor analysis, the original data are analyzed and processed. The results show that as a combination of major factor elements, the component of the component is better integrated in the study area. The results show that: Pb-Sb-As-Zn-CD is a good combination of elements in the study area. The result of spherical test statistics and the load diagram of rotation factor all confirm the consistency and reliability of the results of multivariate statistical analysis. According to the results of the soil geochemistry survey, the background value and the lower limit of the anomaly were determined by iterative method, and the geochemical anomaly map was compiled, and 9 single element anomalies were drawn up in the west investigation and evaluation area of Bafu antler in Ando County, Tibet. There are 15 anomalous elements in circle order, among which 3 Pb anomalies and 7 Ag anomalies have obvious concentration centers, and the outliers are very high, indicating mineralization. According to the results of single element anomaly analysis and evaluation, the synthetic anomaly map of geochemical exploration is drawn, and 9 multielement combination anomalies are obtained, of which 3 are category B anomalies and 6 are class C anomalies. In addition, the results of geophysical IP ladder in the study area are analyzed, mainly according to the apparent polarizability anomaly delineating three anomalous zones, numbered as JD1, JD2 and JD3, respectively, which may be caused by further enrichment of sulfides dominated by Ag-Pb under the action of faults. There is no magmatic outcrop, no fault and fold structure, weak alteration and mineralization of surrounding rock, longitudinal study area of limonite mineralization, and many geochemical anomaly areas on both sides of the study area. It is inferred that limonite mineralization is the prospecting mark of this area. Based on the comprehensive analysis of the geological data of the study area, combined with the results of the investigation of the geochemical anomalies of the soil and the results of the induced electric ladder, and referring to the location of the limonite mineralization zone, The authors have delineated a metallogenic prediction area of the main elements of AgPb in the central and southern part of the study area, and preliminarily analyzed the genesis of geophysical and geochemical anomalies, which is of certain theoretical significance and practical prospecting value for the further prospecting work.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.4

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