西北地质2018，Vol.51Issue(2)：93-107,15.
高光谱标志性蚀变矿物组合在找矿预测中的应用研究——以东昆仑东—西大滩一带金矿床为例
Iconic Altered Mineral Assemblages on Prospecting Prediction by Hyperspectral Remote Sensing: Example from the Gold Deposits in Dongdatan and Xidatan Region of East Kunlun Mountain
摘要
Abstract
The East Kunlun area is a very important and promising metallogenic belt in Qinghai Province,where developed an integrated orogenic gold metallogenic series.The metallogenic geological conditions in Dongdatan and Xidatan area have been analyzed in this paper.The results indicate that a good location-vacancy for metallogenic series of orogenic gold deposits exists in Dongdatan and Xidatan.Anomaly extracting results of hyperspectral data (CASI/SASI) indicate that seven types of altered minerals were mainly developed in this area,such as siderite,hornblende,chlorite,epidote,dolomite,calcite,long-medium-short wave of sericite.Different types of altered mineral groups reflect the distribution of shear zones in this region.Though developing the ground spectral measurements of the typical deposit by ASD instrument,this study summarizes the spectral characteristics of different geological units and altered minerals.It proposes that siderite + dolomite + medium wave sericite group is the iconic alteration mineral assemblages in this region.The prospecting criterion is the brittle-ductile shear zone that developed jarosite + limonitization.Combining the X-ray diffraction analysis of mineral composition in these rocks,it shows that the gold mineralization is closely related to regional metamorphism carbonate formnearation,which was controlled by the nearly EW brittle-ductile fault.Then,based on the iconic altered mineral assemblage of hyperspectrum anomaly and it predicts that there are two shear zones located in Wushibada Valley and Xidatan,with good prospecting potential of gold deposits.It also builds the gold prospecting model basing on high spectral information.关键词
标志性蚀变矿物组合/金矿床/高光谱遥感/找矿预测/东昆仑Key words
the iconic altered mineral assemblage/gold deposit/hyperspectral remote sensing/prospecting prediction/East Kunlun分类
天文与地球科学引用本文复制引用
任广利,梁楠,张转,杨敏,李健强,韩海辉,高婷,秦凯,杨军录..高光谱标志性蚀变矿物组合在找矿预测中的应用研究——以东昆仑东—西大滩一带金矿床为例[J].西北地质,2018,51(2):93-107,15.基金项目
“十二五”国家科技支撑计划项目“岔路口-神仙湾铅锌成矿带成矿地质背景及靶区优选”(2015BAB05B03-01),中国地质调查局项目“东昆仑成矿带木孜塔格铅锌铜金多金属矿调查评价区地质矿产调查”(DD20160002),“国家自然科学基金”(41502312)和“航空高光谱遥感调查”(基[2013]01-023-011)联合资助 （2015BAB05B03-01）
