| 新疆东戈壁地区高光谱遥感蚀变特征及找矿分析 |
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| 引用本文： | 王永军,王瑞军,孙永彬,王诜.新疆东戈壁地区高光谱遥感蚀变特征及找矿分析[J].矿床地质,2019,38(2):439-448. |
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| 作者姓名： | 王永军 王瑞军 孙永彬 王诜 |
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| 作者单位： | 核工业航测遥感中心,河北石家庄,050002;核工业航测遥感中心,河北石家庄,050002;核工业航测遥感中心,河北石家庄,050002;核工业航测遥感中心,河北石家庄,050002 |
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| 基金项目： | 中国地质调查局项目（编号：12120114036501、12120113099700）资助 |
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| 摘 要： | 针对新疆东戈壁地区还未开展高光谱遥感方面的相关研究问题,提出利用地面和航空高光谱遥感蚀变异常特征,进行蚀变异常带分析及找矿应用的工作思路,系统剖析蚀变矿物异常特征,圈定蚀变带,野外查证新发现多金属矿化线索,取得较好的找矿应用效果。东戈壁地区周边分布有较多的铁及多金属矿床、矿点,成矿地质条件优越,且属准平原状的丘陵地貌,植被覆盖少,基岩裸露好,围岩蚀变发育,具备开展地面和航空高光谱测量的地质和自然地理条件,可获取高质量的高光谱遥感数据并为找矿勘查服务。文章选择新疆东天山成矿带的东戈壁地区,利用FieldSpec Pro FR地面波谱数据和HyMap航空高光谱遥感数据,解析地面各地质体所反映的蚀变矿物异常特征,系统剖析褐铁矿+赤铁矿、绢云母、绿泥石、角闪石等蚀变矿物的异常分布规律和反映的地质意义,综合区域地质特征和成矿规律,圈定高光谱遥感蚀变带,开展蚀变带的野外查证,新发现赋存于石英岩化(含)铁碧玉岩、变细碧岩、石英脉体中的铁、钼等多金属矿化,结合地质、蚀变矿物特征,初步预测东戈壁地区具有形成火山-沉积-后期热液改造型铁矿床、石英脉型钼矿床的成矿潜力,后期应开展以钼、铁矿为主的资源评价,重点开展石英岩化(含)铁碧玉岩、变细碧岩、石英脉体与褐铁矿+赤铁矿、绢云母、绿泥石、角闪石等蚀变矿物叠加地段的地质找矿。高光谱遥感技术可以快速获取异常信息和精确定位矿化异常信息部位,可发现较好的多金属矿化线索,为东戈壁地区下一阶段地质找矿和资源评价提供依据。
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| 关 键 词： | 地质学 高光谱遥感 蚀变特征 蚀变带 找矿分析 东戈壁地区 |
| 收稿时间： | 2018/10/7 0:00:00 |
| 修稿时间： | 2019/2/21 0:00:00 |
Characteristics of hyperspectral remote sensing alteration anomaly and oreprospecting analysis in Donggebi area of Xinjiang |
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| WANG YongJun,WANG RuiJun,SUN YongBin and WANG Shen.Characteristics of hyperspectral remote sensing alteration anomaly and oreprospecting analysis in Donggebi area of Xinjiang[J].Mineral Deposits,2019,38(2):439-448. |
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| Authors: | WANG YongJun WANG RuiJun SUN YongBin and WANG Shen |
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| Institution: | Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, Hebei, China,Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, Hebei, China,Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, Hebei, China and Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, Hebei, China |
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| Abstract: | Donggebi area has the geological and natural geographic conditions to carry out surface and aerial hyperspectral surveys,from which high-quality hyperspectral remote sensing data can be obtained to serve prospecting and exploration, because there are many iron and polymetallic deposits and ore spots around the area., the metallogenic geological conditions are favorable and belong to the quasi-plain hilly landform with less vegetation coverage, along with good exposed bedrock and well developed wall rock alteration. Based on FieldSpec Pro FR ground spectrum data and HyMap aerial hyperspectral remote sensing data, Donggebi area of the East Tianshan metallogenic belt in Xinjiang was selected, and delineation of hyperspectral remote sensing alteration zone was carried out through the process that anomaly characteristics of altered minerals reflected by geological bodies on the ground were analyzed, and the abnormal distribution rules and geological significance of altered minerals such as limonite+hematite, sericite, chlorite and amphibole, as well as metallogenic regularity were systematically analyzed. Iron and molybdenum polymetallic mineralization occurring in quartzite (including) jasperite, metaspilite and quartz veins were found in the field verification of alteration zone. Based on the geological and altered mineral characteristics, it is preliminarily predicted that the Donggebi area has the metallogenic potential of forming volcanic-sedimentary-late hydrothermal modified iron deposits and quartz vein type molybdenum deposits. In the late stage, the evaluation of resources mainly consisting of molybdenum and iron ore should be carried out, with the emphasis placed on on the geological prospecting in the superimposed areas of quartzitized jasperite, metaspilite, quartz vein and limonite + hematite, sericite, chlorite, amphibole and other altered minerals. Hyperspectral remote sensing technology can efficiently acquire anomaly information, accurately find the location of mineralization anomaly information, and find better polymetallic mineralization clues, thus providing a basis for geological prospecting and resource evaluation in the next step of exploration in the Donggebi area. |
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| Keywords: | geology hyperspectral remote alteration anomaly characteristics erosion belt ore prospecting analysis Donggebi area |
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