滇西勐统地区地球化学异常特征与找矿靶区筛选

发布时间：2019-04-15 14:09

【摘要】：随着地质找矿的不断深入,地表矿床基本被查明,找矿难度加大。长期的实践表明,地球化学探矿作为一种效率高、找矿效果显著的方法,成为寻找隐伏矿以及难辨别矿的主要手段。本次研究工作选取位于三江成矿带南段的昌宁-孟连Pb、Zn、Ag等多金属成矿带的勐统地区进行地球化学测量,在此基础上结合区域成矿背景进行找矿靶区的筛选,找出成矿有利地段,为后续找矿工作提供方向。前期先对勐统地区展开1:5万水系沉积物测量工作,总结对比选取出适合该地区的地球化学异常提取方法,采用网格法对水系沉积物测量获得离散数据处理,取得较好的插值。基于前人已经在该地区验证并得出了统一的地球化学背景结论及认识,所以本次研究通过频率分布直方图得出21种元素基本具有单峰的特征,进而利用了剔除迭代法确定了异常下限。进一步依据研究区地质成矿背景及景观背景划分出三个地质小区,所以单方面的异常下限已经不足以代表整个研究区,因此又统算了不同子区中的异常下限。又利用元素共生组合分析规律,通过相关性分析、因子分析、R型聚类三种方法确定了五组元素共生组合,最后利用DGSinfo软件对异常面积最大的元素区进行着色处理,勾绘并圈定出多元素综合异常区。后期对圈定出的七个异常区进行1:1万土壤剖面测量,在每个异常区中根据异常区的面积和展布布置合适的土壤采样以及X荧光现场分析样,对七个异常区予以验证,着重划分出两个找矿靶区。
[Abstract]:With the continuous deepening of geological prospecting, surface deposits are basically identified, and it is more difficult to find ore deposits. Long-term practice shows that geochemical prospecting, as a method with high efficiency and remarkable prospecting effect, has become the main means of searching for concealed ore and difficult to distinguish ore. In this study, the Mengseries area of Changning-Menglian Pb, Zn,Ag polymetallic metallogenic belt located in the southern part of Sanjiang metallogenic belt was selected for geochemical survey. On this basis, the ore-prospecting target area was screened in combination with the regional metallogenic background. Find out the ore-forming favorable area, provide the direction for the follow-up ore prospecting work. In the early stage, 1: 50 000 river sediment survey was carried out in Mengtong area, and the geochemical anomaly extraction method suitable for Mengtong area was summarized and selected, and the discrete data processing was obtained by using grid method to measure stream sediment. Better interpolation is obtained. Based on the conclusion and understanding of geochemical background which has been verified by predecessors in this area, this study shows that 21 elements have the characteristic of single peak through the histogram of frequency distribution. Furthermore, the lower limit of the anomaly is determined by the elimination iteration method. According to the geological metallogenic background and landscape background of the study area, three geological zones are further divided, so the single anomaly lower limit is not enough to represent the whole study area, so the anomaly lower limit in different sub-regions is calculated. By using the rule of element symbiosis combination analysis, five groups of elements symbiosis combination were determined by correlation analysis, factor analysis and R-type clustering. Finally, the element region with the largest anomaly area was colored with DGSinfo software. Delineate and delineate the multi-element synthetic anomaly area. In the later stage, 1: 10,000 soil profile measurements were carried out in the seven abnormal areas, and the seven abnormal areas were verified by appropriate soil sampling and X-ray fluorescence field analysis samples according to the area and distribution of the abnormal areas in each abnormal area. Two prospecting targets are emphatically divided.
【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】：P632

【参考文献】