西南三江成矿带中南段不同构造单元内构造与矿床（点）相关性及成矿远景区的圈定

发布时间：2018-04-08 07:49

本文选题：西南三江　切入点：构造单元　出处：《成都理工大学》2017年硕士论文

【摘要】：“三江”地区是特提斯成矿域指怒江、澜沧江和金沙江三条江并流的横断山脉地区,地跨滇西、川西、藏东及青海南部,包括青藏高原东部和云贵高原西部,成矿条件极其优越,是我国重要的铜、铅锌、金、银等多金属成矿带。论文在搜集和整理研究区资料的基础上,利用GIS软件对资料数据进行录入筛选分析,应用不同的分析方法,将不同构造单元内的构造分别与矿床(点)进行相关分析,找出它们在空间分布上的空间分布关系,总结规律,从而圈定成矿远景区的分布区域。论文取得的主要成果如下:(1)收集与整理研究区内各断裂构造多源数据资料,按照构造分级原则将研究区内的构造分为4个级别,并在野外做了部分的验证工作。在此基础上,分析了研究区单位网格中构造的长度特征与空间分布规律。(2)对研究区内各类矿床(点)进行多源数据资料收集与整理,对研究区内的884个矿床(点)的信息进行归类总结,根据其规模的大小进行划分,对每个构造单元内的矿点进行统计,分析每个构造单元内单位网格中矿床(点)的空间分布规律与矿床(点)数量特征。(3)通过相关性指数计算公式,计算出13构造单元内构造与矿床(点)的相关性指数,比较指数大小得出每个构造单元内最优缓冲区。通过建立密度图分析其相关性指数高低值分布特征。(4)在最优缓冲区建立的基础上,综合应用构造与矿床(点)关系多种分析方法,对研究区异常区提取。主要有:不同构造单元内对构造与不同规模的矿床(点)进行相关指数的计算、构造复杂度的获取、构造交点密度、构造等密度、构造方位等的插值结果等等。并分析其在空间上的分布上的特征,总结其在研究区内的分布规律,计算出每种分析方法的异常区域。根据每种方法对矿床(点)相关性指数的大小进行权重叠加,最后圈定了成矿的远景区域。基于以上得出的研究成果,可以很明确的得出断裂与矿床(点)在空间上的相关性。在不同的构造单元内,而不是整个三江区域,范围的缩小使本文能够更加细化的描述了三江地区内的矿床(点)与构造之间的关系,能够更加准确的预测出研究区成矿区域,对西南三江区域的成矿规律也是一种补充,希望对西南三江找矿有一定的指导意义。
[Abstract]:The "Sanjiang" region is an area of Hengduan Mountains with three rivers, the Nujiang, Lancang and Jinsha rivers. It spans western Yunnan, western Sichuan, eastern Tibet and southern Qinghai, including the eastern part of the Qinghai-Tibet Plateau and the western part of the Yunnan-Guizhou Plateau.The metallogenic conditions are extremely superior and are important polymetallic metallogenic belts of copper, lead, zinc, gold and silver in China.On the basis of collecting and arranging the data of the study area, the paper uses GIS software to input and screen the data, and applies different analysis methods to analyze the correlation between the structures in different tectonic units and the deposits (points), respectively.To find out their spatial distribution relationship, sum up the law, so as to delineate the distribution of metallogenic scenic areas.The main achievements of this paper are as follows: (1) collecting and collating the multi-source data of each fault structure in the study area, according to the principle of structural classification, the structure in the study area is divided into four levels, and some verification work is done in the field.On this basis, the length characteristics and spatial distribution of the structure in the unit grid of the study area are analyzed. The data of various deposits (points) in the study area are collected and sorted out.The information of 884 deposits (points) in the study area is classified and summarized, and the ore points in each tectonic unit are classified according to their size.Based on the analysis of the spatial distribution of deposits (points) in each unit grid and the quantitative characteristics of deposits (points), the correlation index between the structures and the deposits (points) in the 13 tectonic units is calculated by the formula of correlation index.The optimal buffer in each construction unit is obtained by comparing the index size.On the basis of the establishment of optimal buffer zone, various analysis methods for the relationship between structure and deposit (point) are used to extract the anomalous area in the study area by establishing the density map to analyze the distribution characteristics of the correlation index of high value and low value.The main contents are as follows: the calculation of correlation exponents between structures and deposits (points) of different sizes in different tectonic units, the acquisition of structural complexity, the density of tectonic intersection points, the interpolation results of structural isodensity, structural azimuth, and so on.The characteristics of its spatial distribution are analyzed, and its distribution in the study area is summarized, and the abnormal regions of each analytical method are calculated.According to each method, the size of correlation index of ore deposit (point) is weighted superposition, and finally the metallogenic prospective area is delineated.Based on the above research results, the spatial correlation between faults and deposits can be clearly obtained.In different tectonic units, rather than the whole Sanjiang area, the reduction of the scope of this paper can more detailed description of the relationship between the deposits (points) and structures in the Sanjiang area, and can more accurately predict the metallogenic region in the study area.It is also a supplement to the metallogenic law in the Sanjiang area of southwest China, and it is hoped that it will be of guiding significance to the prospecting of the three rivers in the southwest.
【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】：P612

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