新疆乌恰县沙热塔什一带遥感找矿模型建模及应用

发布时间：2018-03-01 01:07

本文关键词： 沙热塔什铅锌矿遥感找矿模型 ASTER 成矿远景区　出处：《新疆大学》2017年硕士论文　论文类型：学位论文

【摘要】：乌恰县沙热塔什铅锌矿位于塔里木盆地(Tarim Basin)西北缘、迈丹他乌古生代陆缘地-塔里木盆地西北缘新生代陆内盆地一带,属塔里木西北缘层控型铅锌成矿带。成矿区带属阔克沙勒岭Fe-Cu-Pb-Zn-Sn-铝土矿矿带,其外围显示出良好的找矿远景。通过研究区域成矿地质背景、控矿要素、成矿规律、遥感致矿异常特征和典型矿床解剖,从已获得的地质数据与资料中,针对优势矿产成矿地质背景提取遥感找矿标志,建立遥感找矿模型。进行遥感地面验证,对遥感找矿模型进行修正,并圈定遥感找矿远景区。本文以新疆乌恰县沙热塔什一带为研究区,结合已有的区域地质矿产调查项目资料,主要是以沙热塔什碳酸盐岩-细碎屑岩型铅锌矿床为研究的重点,基于ASTER和landsat-8 OLI影像数据,综合研究与碳酸盐岩-细碎屑岩型铅锌矿床密切相关的含矿建造、断裂构造、岩浆岩等成矿作用以及矿化有关的围岩蚀变与成矿的关系,借助ASTER影像数据,对比分析研究区内典型矿物的波谱曲线特征,以地质特征和波谱曲线特征进行了典型矿床(沙热塔什铅锌矿)以及沙热塔什一带进行详细的遥感信息的提取,从而建立研究区遥感找矿标志和信息提取的遥感找矿模型,在系统分析典型矿床(沙热塔什铅锌矿)以及区域地质背景的基础上,利用landsat-8 OLI遥感影像数据对研究区的线性构造进行了系统的解译,借助地理信息系统(Geographic Information System),将研究区内与成矿密切相关的遥感找矿信息(岩性、构造和蚀变)提取以及集成,最终在研究区范围内圈定找矿远景区,以期为区域矿产勘查部署工作奠定了基础。本文主要的成果和认识如下:(1)根据ASTER影像数据和已有地质矿产勘查找矿新成果等前人资料,确定沙热塔什铅锌矿床的主要矿化蚀变类型,通过比值、主成分方法进行蚀变信息提取研究,提取结果显示碳酸盐化出露的高值区与现有碳酸盐地层出露吻合度较高,同时与铁染高值区具有较高程度的吻合作为找矿最佳指示,以此作为遥感找矿模型。(2)利用经过图形融合等处理的landsat-8 OLI影像数据,在沙热塔什一带对基础地质信息进行初步的目视判译工作,通过野外调研对解译标志进一步补充和修正,其中在区域内北西向构造最发育,次级断裂主要为北东向、近南北向、这些与区域主断裂斜交的次级断裂更有利成矿。(3)对遥感和传统地质数据进行统一分析,各种信息图层在ArcGIS平台上进行集成,得到研究区蚀变、构造密度图等区域遥感找矿信息,结合地质特征和前人研究成果,圈定了2个碳酸盐岩-细碎屑岩成矿远景区,与新疆地矿局第二地质大队2006年在乌恰县沙热塔什研究区划定的找矿远景区基本相符,为沙热塔什一带找矿工作开展了有益的尝试。
[Abstract]:The Shagetash lead-zinc deposit is located in the northwestern margin of Tarim Basin and the Cenozoic intracontinental basin in the northwestern margin of the Tarim Basin. The ore-forming belt belongs to the Fe-Cu-Pb-Zn-Sn-bauxite ore belt in Kuokeshalling, and its periphery shows a good prospecting prospect. By studying the regional metallogenic geological background, ore-controlling elements and metallogenic regularity, the metallogenic belt belongs to the stratified lead-zinc metallogenic belt in the northwestern margin of Tarim. Based on the geological data and data obtained, the remote sensing prospecting criteria were extracted from the geological background of the dominant mineral deposits, and a remote sensing prospecting model was established, which was verified by remote sensing. The model of remote sensing prospecting is revised and the remote sensing prospecting area is delineated. This paper takes the area of Shagetash, Wuqixian, Xinjiang as the research area, and combines with the existing regional geological and mineral survey project data. Based on ASTER and landsat-8 OLI image data, the ore-bearing formations and fracture structures closely related to carbonatite-fine clastic type lead-zinc deposits are studied, which are mainly focused on the Saratash carbonate and fine clastic rock type lead-zinc deposits, and based on the ASTER and landsat-8 OLI image data. With the help of ASTER image data, the characteristics of wave spectrum curves of typical minerals in the study area are compared and analyzed. Based on the geological characteristics and spectral curve characteristics, the detailed remote sensing information of typical deposits (Shagetash lead-zinc deposit) and the area of Sagatash are extracted, and a remote sensing prospecting model of remote sensing prospecting marks and information extraction in the study area is established. Based on the systematic analysis of typical deposits (Shagetash lead-zinc deposit) and regional geological background, the linear structure of the studied area is systematically interpreted by using landsat-8 OLI remote sensing image data. With the help of Information system, the remote sensing prospecting information (lithology, structure and alteration), which is closely related to ore-forming, is extracted and integrated in the study area. In order to lay a foundation for the regional mineral exploration and deployment, the main achievements and understandings of this paper are as follows: 1) based on the ASTER image data and the existing new achievements in geological and mineral exploration and prospecting, etc. The main mineralization alteration types of Shagetash lead-zinc deposit are determined. The alteration information is extracted by ratio and principal component method. The results show that the high value area of carbonate outcrop is in good agreement with the existing carbonate strata. At the same time, it has a high degree of agreement with the high value area of iron stain as the best indicator for prospecting, which is used as the remote sensing prospecting model. (2) using the landsat-8 OLI image data processed by image fusion and so on. A preliminary visual interpretation of the basic geological information was carried out in the area of Sagatash, and the interpretation marks were further supplemented and corrected through field investigations. Among them, the NW trending structure is the most developed in the region, and the secondary faults are mainly NNE and NNE. These secondary faults, which are oblique with the regional main faults, are more favorable for the analysis of remote sensing and traditional geological data. The information layers are integrated on the ArcGIS platform to obtain the regional remote sensing prospecting information such as alteration, tectonic density map, etc. Combined with geological characteristics and previous research results, two carbonate rock-fine clastic rock metallogenic scenic spots have been delineated, which are basically in line with the prospecting areas designated by the second Geological Group of the Xinjiang Geology and Mining Bureau in the Shagetash research area of Wuqia County on 2006. A useful attempt has been made for prospecting in the area of Saratash.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P627

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