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

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.