湖南花垣铅锌矿遥感信息提取与成矿预测研究

发布时间：2018-04-28 23:26

本文选题：铅锌矿 + 遥感信息提取　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：湘西地区是我国重要的铅锌矿产基地之一,2001年国土资源大调查取得显著的找矿成果。该地区的成矿地质条件和成矿地质背景优越,铅锌矿是该地区的特色矿产资源。湘西北铅锌矿床是中国著名的层控型金属矿床,其地质特征类似于美国的密西西比铅锌矿床。该矿床的矿层厚度大、资源量规模大,虽然矿石品位较低,入选品位也很低,但矿床易开采、易选冶。因此,研究该矿床的成矿地质特征,并预测新的成矿靶区具有重大的现实意义。利用遥感技术进行地质填图和矿产资源调查,能够替代人工进入气候、地形环境恶劣的地区,不分昼夜的进行探测,极大的解决了空间、时间带来的难题,减少了人工的时间和成本,提高了工作效率,加快了成果的产出,为科研和生产都带来了便利。在了解区域地质状况和成矿背景等相关知识下,利用多元遥感数据,通过遥感图像处理及遥感构造和蚀变信息提取,结合该区地质图、化探数据,使用证据权法进行成矿预测,主要取得如下成果:1.利用GF-1数据和ETM+数据解译地层及线性构造,解译出了主要的大型断裂带,和二级线性构造,并根据岩性特征和地层对应关系,解译研究区内主要地层;2.利用ETM+数据使用“Crosta法+主成分分析”,进行羟基蚀变信息和铁染蚀变信息提取,并使用门限化的方法进行分级,结合已知矿床(点)的空间分布,对解译结果进行了评价;3.依据花垣地区铅锌矿的成矿模式和控矿的要素,确定找矿标志。4.叠加线性构造信息、遥感羟基蚀变、铁染蚀变信息的基础上,辅以地球化学异常,选取7个证据因子,使用证据权重法,圈定了三个成矿靶区。
[Abstract]:Xiangxi area is one of the important lead and zinc mineral bases in China. The metallogenic geological conditions and metallogenic geological background in this area are superior, and lead and zinc deposits are the characteristic mineral resources in this area. The northwestern Hunan lead-zinc deposit is a famous stratabound metal deposit in China, and its geological characteristics are similar to that of the Mississippi Pb-Zn deposit in the United States. Although the ore grade is low and the ore selection grade is very low, the ore deposit is easy to be mined and processed. Therefore, it is of great practical significance to study the ore-forming geological characteristics of the deposit and to predict the new ore-forming target area. Using remote sensing technology to carry out geological mapping and mineral resources investigation can replace the artificial entry into the climate, the harsh terrain and environment, and the exploration day and night, which greatly solves the difficult problems brought about by space and time. It reduces the time and cost of labor, improves working efficiency, accelerates the output of results, and facilitates scientific research and production. Based on the knowledge of regional geological condition and metallogenic background, using multivariate remote sensing data, remote sensing image processing, remote sensing structure and alteration information extraction, combined with geological map, geochemical exploration data, and using the method of weight of evidence to carry out metallogenic prediction, The main achievements are as follows: 1. Using GF-1 data and ETM data to interpret stratigraphic and linear structures, major large fault zones and secondary linear structures are interpreted. According to lithologic characteristics and stratigraphic correspondence, the main strata in the study area are interpreted. The hydroxyl alteration information and iron stain alteration information were extracted from ETM data by Crosta principal component analysis, and classified by threshold method. The interpretation results were evaluated with the spatial distribution of known deposits (points). According to the ore-forming model and ore-controlling factors of lead-zinc deposit in Huayuan area, the ore-prospecting mark .4. On the basis of superposition of linear structural information, remote sensing of hydroxyl alteration and iron stain alteration, and with geochemical anomalies, seven evidence factors are selected and three ore-forming target areas are delineated by evidence weight method.
【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】：P618.4;P627

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