武夷德化-尤溪-永泰矿集区遥感解译与光谱特征分析
投稿时间:2021-11-23  修订日期:2022-10-07  点此下载全文
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李 萌 中国石化石油勘探开发研究院 100083
黄照强 中国冶金地质总局矿产资源研究院 
吴华英 中国冶金地质总局矿产资源研究院 
牛斯达 中国冶金地质总局矿产资源研究院 
倪斌 中国冶金地质总局矿产资源研究院 
基金项目:国家重点研发计划项目“华南陆内成矿系统的深部过程与物质响应”
中文摘要:德化-尤溪-永泰矿集区位于武夷山成矿带南端,已发现多处与火山-次火山作用有关的热液型矿床。本次研究通过遥感影像解译来分析矿集区内断裂、火山机构等构造特征,通过遥感蚀变信息、岩矿光谱特征研究和蚀变矿物填图,提取矿集区主要蚀变矿物信息,探索蚀变矿物组合及分布特征。遥感影像解译表明,本区以NE向断裂带为主,为矿区火成岩喷溢和矿液上升提供了通道,控制着矿脉和岩脉的产出。遥感蚀变信息提取揭示,矿集区羟基和铁染蚀变具有分布规律性,主要分布在西部沿NE向断裂走向蚀变区、中部环绕雷潭-安村火山机构的蚀变区和东北部环绕和顺火山机构的蚀变区,对矿体分布具有一定的指示意义。岩矿光谱识别表明,矿集区主要蚀变矿物类型有蒙脱石、伊利石、多硅白云母、绿泥石、硬石膏等。在此基础上,进一步构建了邱村金矿蚀变分带模型,伊利石+多硅白云母的蚀变组合位于主矿体附近,而蒙脱石+硬石膏的蚀变组合则位于主矿体边缘,对于区域找矿方向具有指示意义。
中文关键词:德化-尤溪-永泰矿集区  遥感解译  光谱测量  蚀变矿物填图
 
Remote Sensing Interpretation and spectral characteristic analysis of Dehua-Youxi-Yongtai Mining Area, Fujian Province
Abstract:The Dehua–Youxi–Yongtai (DYY) ore district, located at the southern end of the Wuyishan metallogenic belt in SE China, contains many hydrothermal deposits related to volcanic and subvolcanic activity. We carried out remote sensing studies at the DYY ore district and spectral and geochemical studies on its wall rocks and the mineralization in order to document the distributions of faults, volcanoes, and alteration, the nature of the intrusive rocks, and the details of the metallogenesis. The Qiucun gold deposit is representative of the DYY district, and we used it as a case study. In the DYY ore district, the intersection of two fault sets played a key role in providing channels for the emplacement of igneous rocks and for the migration of ore-forming liquids and the hosting of ore deposits and the gold mineralization. The remote sensing anomalies of alteration rocks comprise hydroxyl anomalies (OHA) and ferric contamination anomalies (FCA), and both distributed mainly along the main faults and volcanic rocks of the region, and the most significant mineralization is located in regions of intense alteration. The OHA of the Qiucun gold deposit are generally located close to the main orebody, and we propose the use of these anomalies as exploration targets in the region. Spectral analyses show that the alteration assemblage of illite and phengite at Qiucun is spatially associated with the main orebody, while the alteration assemblage of montmorillonite and anhydrite is located at the outer edge of the orebody, which has indicative significance for regional prospecting direction.
keywords:Dehua–Youxi–Yongtai ore district  Qiucun gold deposit  remote sensing interpretation  spectral measurement  alteration mineral mapping
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