广东省潮州市登塘镇白水一带,在花岗岩风化壳中发现离子吸附型稀土矿。矿区在大地构造位置上,位于新华夏系构造韩江——榕江北西向构造带,韩江断裂南西侧,葫芦田岩体东部边缘相。花岗岩原岩系中粒黑云母花岗岩,岩体属燕山晚期第二次侵入岩(r~2y),同位素年龄测定约153百万年。在花岗岩中石英含量30—38%,钾长石含量25—45%,斜长石15—36%,黑云母少量,呈鳞片状散布于岩石中。岩石中普遍含有镀、钇、镱、镧、镓等稀有、稀土金属元素,为本区风化壳离子吸附型稀土矿床的形成提供了丰富的物质来源。风化壳为铁褐、黄褐色,表面因析出铁质呈砖红、紫红色。高岭土为乳白色,表面铁染为黄褐色。风化 Guangdong province Chaozhou Dengtang town Baishui area, found in the granite weathered crust ion adsorption rare earth ore. The mining area is located at the tectonic position of the earth in the Xinhuaxiaian system of the Hanjiang-Rongjiang NWWT belt, the southwestern part of the Hanjiang fault and the eastern edge of the Hulutian rock mass. The granitic protolith is medium-sized biotite granite, which belongs to the second intrusive rock (r ~ 2y) in the late Yanshanian period and has an isotopic age of about 153 million years. In granite quartz content of 30-38%, potassium feldspar content of 25-45%, 15-36% of plagioclase, a small amount of biotite, was scaly scattered in the rock. The rocks generally contain rare earth elements such as yttrium, yttrium, ytterbium, lanthanum and gallium, and rare earth metals, which provide a rich source of material for the formation of weathered crust ion-adsorbed rare earth deposits in this area. Weathered crust is iron brown, yellow brown, the surface was precipitated iron was brick red, purple. Kaolin is milky white, surface iron dye to brown. weathering