摘要
班公湖-怒江(班怒)成矿带是西藏地区三大斑岩成矿带之一,其西段产出多龙等一系列斑岩-矽卡岩矿床。近年来该带的找矿勘查不断有新发现,表明该带仍具有很大的找矿潜力。该带属高寒山区,地质研究程度很低,常规的矿产勘查技术效率低下。本次研究中,参照斑岩铜矿的面状蚀变特征和蚀变带内含水蚀变矿物组合,以及班怒成矿带中已有典型斑岩铜矿的成矿模式和勘查模型,从多分辨率、多类型遥感图像中提取了与斑岩铜矿密切相关的围岩蚀变信息;在成矿带、矿集区等不同尺度上综合遥感、地质等多元地学信息,圈定了斑岩铜矿找矿远景区;通过野外验证和综合地质评价,发现了多处具有重大成矿潜力的斑岩铜矿远景区。这些远景区将羌塘南缘斑岩成矿带向中-东段延伸了约600km,同时指示在班怒成矿带已有多龙矿集区北侧、羌塘地块腹地存在一个新的斑岩铜矿成矿带,并且在班公湖-怒江带北侧、羌塘南缘还可能存在与晚侏罗世岩浆活动相关的斑岩铜矿成矿事件。总之,本次研究提出的遥感勘查技术能够有效提高班怒成矿带斑岩铜矿的勘查效率,新发现的斑岩铜矿成矿带和成矿事件对于丰富班怒成矿带的区域成矿规律、拓展新的找矿方向和部署新的找矿勘查工作都具有重要的意义。
As one of the triple metallogenic belts in Xizang,Bangonghu-Nujiang(BN)metallogenic belt produces a series of porphyry-skarn deposits.In recent years,new discoveries were made in the prospecting and exploration in this belt,indicating significant potential for mineral exploration of the belt.In this cold alpine belt with a lack of geological research and information,conventional mineral exploration techniques fail.In this study,with reference to the metallogenic characteristics of typical porphyry copper deposits in the belt,including planar alteration,hydrous mineral groups in alteration zoning,and metallogenic models and exploration models,the alterations of wall rocks closely relevant to porphyry copper deposits were extracted from multi-resolution,multi-type remote sensing imagery.By integrating multi-source geoinformation of remote sensing and geology of metallogenic belt and ore concentration areas of different scales,respectively,prospecting areas of porphyry copper deposits were delineated.Using field verification and comprehensive geological evaluation,several prospecting areas with significant mineral potential were identified,geologically extending the BN metallogenic belt about 600km towards the central-eastern segment of the southern margin of the Qiangtang terrane.It is proposed that there exists a new metallogenic belt of porphyry copper deposits to the north of the known Duolong ore concentration area within the BN belt and the Qiangtang terrane,and a metallogenic event of porphyry copper deposits related to Late Jurassic magmatism occurred on the northern side of the BN belt and the southern margin of Qiangtang terrane.Conclusively,the remote sensing exploration techniques proposed in the study can greatly improve exploration of porphyry copper deposits in the BN belt,and the new metallogenic belt of porphyry copper deposits and the metallogenic event are significant for enriching the regional metallogenic theories and patterns of BN metallogenic belt,designing new scopes of mineral exploration,and deploying exploration work.
作者
荆林海
李光明
丁海峰
赵洁
李金祥
张夏楠
JING LinHai;LI GuangMing;DING HaiFeng;ZHAO Jie;LI JinXiang;ZHANG XiaNan(School of Information Engineering,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Digital Earth Science,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;State Key Laboratory of Lithospheric and Environmental Coevolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;International Research Center of Big Data for Sustainable Development Goals,Beijing 100094,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Continental Collision and Plateau Uplift,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)
出处
《岩石学报》
北大核心
2025年第2期362-382,共21页
Acta Petrologica Sinica
基金
第二次青藏高原综合科学考察研究项目(2019QZKK0806)资助.
关键词
斑岩铜矿
遥感
班公湖-怒江成矿带
成矿预测
Porphyry copper deposit
Remote sensing
Bangonghu-Nujiang metallogenic belt
Prospecting
