武夷德化-尤溪-永泰矿集区遥感解译与光谱特征分析

Remote sensing interpretation and spectral characteristic analysis of Dehua-Youxi-Yongtai ore concentration area, Wuyi

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,德化-尤溪-永泰矿集区以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。遥感蚀变信息的提取揭示了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,研究结果对区域找矿方向具有指示意义。

Dehua-Youxi-Yongtai ore concentration area is located in the south of Wuyishan metallogenic belt, and many hydrothermal deposits related to volcanic-subvolcanism have been found.In this study, the structural features such as fractures and volcanic structures in the ore concentration area are analyzed through remote sensing image interpretation.The information of main altered minerals in the ore concentration area is extracted through remote sensing alteration information, rock mineral spectral characteristics research and altered mineral mapping, and the altered mineral assemblage and distribution characteristics are explored.Remote sensing image interpretation show that the area is dominated by NE trending fault zone, which provides a channel for the eruption of igneous rock and the rise of ore fluid in the mining area, and controls the occurrence of ore veins and rock veins.The extraction of remote sensing alteration information revealed that the hydroxy and iron stained alteration in the ore concentration area has a distribution regularity, which is mainly distributed in the west along the NE trending fault strike alteration area, the middle surrounding Leitan-Ancun volcanic institution alteration area and the northeast surrounding Heshun volcanic institution alteration area, which has a certain significance for the distribution of ore bodies.The spectral identification of rocks and minerals shows that the main types of altered minerals in the ore concentration area are montmorillonite, illite, phengite, chlorite and anhydrite.On this basis, the alteration zoning model of Qiucun Gold Mine is further constructed.The alteration combination of illite+phengite is located near the main ore body, while the alteration combination of montmorillonite+anhydrite is located at the edge of the main ore body.The research results have an indicative significance for regional prospecting direction.