青海都兰拉克洼尔玛地区遥感蚀变信息提取与成矿预测  

Remote Sensing Alteration Information Extraction and Metallogenic Prediction in Lakewa Erma area,Dulan County,Qinghai Province

作　　者：吴明刚 马文虎 马占青 李明杰 徐洪朝 WU Minggang;MA Wenhu;MA Zhanqing;LI Mingjie;XU Hongchao(College of Marine Geosciences, Ocean University of China, Qingdao, Shandong 266100, China;Yantai Gold College, Yantai, Shandong 265401, China;Key Laboratory of Salt Lake Resource Exploration and Research in Qaidam Basin, Qinghai Province,Golmud, Qinghai 816099, China;Qinghai Qaidam Comprehensive Geological and Mineral Exploration Institute, Golmud, Qinghai 816099, China)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]烟台黄金职业学院,山东烟台265401 [3]青海省柴达木盆地盐湖资源勘探研究重点实验室,青海格尔木816099 [4]青海省柴达木综合地质矿产勘查院,青海格尔木816099

出　　处：《中国锰业》2022年第2期79-84,89,共7页China Manganese Industry

基　　金：中国地质调查局青藏专项项目(12120113032900)。

摘　　要：青海都兰拉克洼尔玛地区地处祁曼塔格-都兰多金属成矿带、大海滩-什多龙多金属成矿亚带,成矿地质条件优越,找矿潜力巨大。区内沙柳河南钼矿床围岩蚀变特征显示区内黄铁矿化、黏土化、绢云母化及绿泥石化等围岩蚀变与矿化关系密切。根据铁染、羟基和硅化蚀变矿物的反射率波谱曲线特征,通过对landsat8 OLI遥感数据不同波段进行主成分分析分别提取了铁染、羟基和硅化蚀变信息,并分别圈定了铁染蚀变异常区3处,羟基蚀变异常区5处和硅化蚀变异常区4处。根据铁染、羟基和硅化蚀变异常组合、分带及分布特征,结合成矿地质背景,在区内圈定5个成矿远景区。经地表踏勘,在I_(2)和I_(3)远景区发现明显的铜钼等矿化,验证效果较好,为区内多金属矿床勘探找矿工作提供了有效参考。Lakewalma area is located in Qimantage-Dulan polymetallic metallogenic belt and Dashan-Shidolong polymetallic metallogenic sub-belt,with superior metallogenic geological conditions and great prospecting potential.The alteration characteristics of surrounding rock of Shaliuhenan Molybdenum deposit show that there is a close relationship among pyritization,clayization,sericitization and chloritization.According to the characteristics of albedo curve of iron-stained,hydroxyl and silicide alteration minerals,we extracted iron staining,hydroxyl and silicification alteration information in landsat8 OLI remote sensing effects by principal component analysis,and delineated 3 iron staining alteration anomaly areas,5 hydroxyl alteration anomaly areas and 4 silicification alteration anomaly areas.According to the anomaly combination,zonation and distribution characteristics of iron staining,hydroxyl and silicification alteration,combined with the metallogenic geological background,five metallogenic prospective areas were delineated in the area.Through surface prospecting,obvious copper and molybdenum mineralization was found in prospect areas I_(2) and I_(3),and the prospecting and verification effect was good,which provided an effective reference for the exploration and prospecting of polymetallic deposits in the area.

关 键 词：landsat8 OLI遥感数据 主成分分析 蚀变信息提取 拉克洼尔玛地区 

分 类 号：P627[天文地球—地质矿产勘探]