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Remote Sensing for Land & Resources    2020, Vol. 32 Issue (3) : 222-231     DOI: 10.6046/gtzyyg.2020.03.29
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Application of hyperspectral spectroscopy to constructing polymetallic prospecting model in Hongshan, Gansu Province
WANG Ruijun1(), ZHANG Chunlei1, SUN Yongbin1, WANG Shen1, DONG Shuangfa1, WANG Yongjun1, YAN Bokun2
1. Airborne Survey and Remote Sensing Center of Nuclear Industy, Shijiazhuang 050002, China
2. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China
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Abstract  

In order to further study and explore the application effect and potential of hyperspectral remote sensing technology in geological prospecting, the authors used the aerial and ground hyperspectral remote sensing data of Hongshan region in Gansu Province to analyze the distribution characteristics of altered minerals or altered anomaly information, summarized the distribution law of altered anomaly of ore-forming geological bodies, and proposed the construction idea of ore-finding positioning model of ore-forming geological environment elements based on alteration information characteristics of known typical deposits, ore-controlling elements and alteration information law of ore-forming geological bodies. The authors gradually revealed the metallogenic geological environment expressed by “minerals-landmark minerals-altered minerals-prospecting anomalies”, and constructed the prospecting positioning model of typical deposits and the comprehensive prospecting positioning model of altered minerals and geological background. Guided by the ore-finding positioning model and combined with geological background and ore-forming laws, the authors applied different models to delineate 4 polymetallic prospective areas. After field investigation, better clues of polymetallic mineralization were found. Practice shows that, by analyzing the intrinsic relationship between hyperspectral alteration information and ore-forming laws, more accurate information can be provided for ore prospecting, and the same kind of polymetallic ore prospecting work can be effectively guided.
Keywords hyperspectral remote sensing      altered mineral assemblage      prospecting positioning model      prospecting analysis      Hongshan      Gansu Province     
:  P612  
  TP79  
Issue Date: 09 October 2020
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Ruijun WANG
Chunlei ZHANG
Yongbin SUN
Shen WANG
Shuangfa DONG
Yongjun WANG
Bokun YAN
Cite this article:   
Ruijun WANG,Chunlei ZHANG,Yongbin SUN, et al. Application of hyperspectral spectroscopy to constructing polymetallic prospecting model in Hongshan, Gansu Province[J]. Remote Sensing for Land & Resources, 2020, 32(3): 222-231.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.03.29     OR     https://www.gtzyyg.com/EN/Y2020/V32/I3/222
Fig.1  Simplified geological map of Hongshan area
波段 波长范
围/μm		 带宽/
μm		 光谱采样
间隔/nm		 波段
数量		 信噪比
可见光(VIS) 0.45~0.89 15~16 15 32 1 000:1以上
近红外(NIR) 0.89~1.35 15~16 15 32 1 000:1以上
短波红外1(SWIR1) 1.40~1.80 15~16 13 32 500:1以上
短波红外2(SWIR2) 1.95~2.48 18~20 17 32 500:1以上
Tab.1  HyMap aerial imaging spectrum system main technical parameter table
Fig.2  Construction of prospecting positioning models
Fig.3  Distribution of high-spectral altered minerals in Hongshan area
Fig.4  Comprehensive information of typical iron deposits
矿床类型 典型矿床找矿定位模型 蚀变矿物与地质背景综合找矿定位模型
沉积变质改造型铁矿床 构造-热液脉型多金属矿床 石英脉型多金属矿床 构造蚀变岩型多金属矿床
地质背景 控矿构造为向西倾伏的罗雅楚山背斜构造; 成矿部位为背斜转折端及北翼; 青白口系大豁落山群第四岩组(Qbd4)为赋矿层位 中酸性岩体、岩脉发育地段,NW向、NWW向或其次级断裂发育地段,外围围岩为成矿有利地质体 酸性岩体、岩脉发育地段,NWW向、近EW向或其次级断裂发育地段,石英脉呈NWW向展布,外围围岩为成矿有利地质体 NW向或其次级断裂发育地段,外围围岩为成矿有利地质体
蚀变特征 围岩蚀变: 黑云母化、阳起石化、透闪石—透辉石化、绿泥石化、绢云母化、碳酸盐化、硅化等; 近矿蚀变: 黑云母化、阳起石化、透闪石—透辉石化等 褐铁矿化、绢云母化、硅化呈脉状或条带状展布 褐铁矿化、硅化、碳酸盐化、绢云母化,蚀变多呈团块状叠加分布 褐铁矿化、赤铁矿化、硅化、绿泥石化、绢云母化、黄钾铁钒化等,地表形成带状褪色蚀变带
高光谱矿物信息特征 近矿蚀变矿物: 褐铁矿、白云石、角闪石、黑云母、中铝绢云母、方解石、绿泥石、绿帘石等; 矿体蚀变矿物: 透闪石、透辉石、阳起石、褐铁矿、白云石、角闪石等 褐铁矿、赤铁矿、绢云母、角闪石、绿帘石、白云石等。矿物信息种类多、丰度高、延伸性好、叠加程度高 褐铁矿、绢云母、绿泥石、白云石等。矿物信息种类较多、丰度较高、延伸性好、叠加程度较高 褐铁矿、绿帘石、绿泥石、绢云母、角闪石等。矿物信息种类多、丰度较高、叠加程度较高
Tab.2  List of prospecting positioning model in Hongshan area
Fig.5  Distribution of mineral prospecting prediction area in Hongshan area
Fig.6  Field photos of Magnet mineralization newly found in field verification in KY01 prospecting prediction area
Fig.7  Distribution of mineralization alteration on surface of tectonic alteration zone found by field verification in SY01 area
Fig.8  Field photos of alteration in prospecting prediction area
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