THE METALLOGENIC GEOMORPHIC CONDITION ANALYSIS OF THE ION-ABSORBING TYPE RARE EARTHS ORE IN THE EASTERN NANLING REGION BASED ON DEM DATA

Rare earths are important strategic resources in China, and ion adsorption type rare earths ore is the characteristics mineral of our country, which occupying an important position. Whether the ion-absorption type mineral deposits can be formed is closed related to the weathering crust, and the development and preservation of weathering crust is subject to micro geomorphology. Therefore, the purpose of this paper is to summarize the weathering crust ion adsorption type rare earth ore metallogenic geomorphic conditions by quantitatively analyzing the terrain factors of geomorphic unit containing rare earth ore under DEM technology, combined with the collected data of rare earth mines and mining area. With the help of GIS technology, terrain elevation, slope, aspect, curvature, surface rolling, surface incision, terrain feature and other kinds of landform factor value were extracted with DEM data. Through the overlay analysis of mineral occurrence and mining area data with the terrain value in the eastern part of Nanling region, the terrain factor value of mineral occurrence and mining area is statistically calculated, and then the geomorphic environment hosting weathering crust type rare earths ore is discussed. The results show that the favorable landscape for REE mineralization is the elevation of 150 ~ 500 m, the slope of 0 ° ~ 20 °, the surface rolling of 100 ~ 400 m, the surface incision of 40~150m, and the terrain feature of the peak or ridge. The results of the study is expected to guide ion adsorption type rare earth ore prospecting exploration in the east of Nanling region.