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在白云鄂博矿区,主赋矿层为(H_5~2)灰褐、黄褐色中厚层状至块状白云岩、含铁白云岩,富含稀有、稀土元素,厚81.2m。下伏(H_5~1)灰黑色磷质白云母片岩、硅质板岩、含磷黑云母板岩、泥板岩夹灰绿色绿帘绿泥板岩和少量白云岩,厚385.1。上覆(H_5~3)灰黑色钠闪斜长片岩、硅质岩、淡绿色条带状硅质岩、暗绿色富钾板岩、富钾粗玄岩,厚度大于27.1m(张鹏远,李双庆等,1993)(注:其他作者多数称赋矿层为H_8,上覆岩层为H_9)。赋矿白云岩东西长达18km,南北宽约2km,矿区白云岩中部厚500～700m,向四周渐薄,东端仅厚50m,西端厚100m,南端厚100～200m(白鸽等,1996)。铁矿体主要在中东部,有东矿和主矿两个大矿体,而在西部
In the Bayan Obo mine area, the main ore-dressing layers are (H_5 ~ 2) gray-brown and medium-thick brown to massive dolomite and iron-bearing dolomite, which are rich in rare earths and rare earth elements and are 81.2m thick. Underlying (H_5 ~ 1) gray-black phosphomitic muscovite schist, siliceous slate, phosphorus-bearing biotite slate, mud slate green-green chlorite slate and a small amount of dolomite, 385.1 thick. Overlying (H_5 ~ 3) gray-black sodium flinty schists, siliceous rocks, pale green banded siliceous rocks, dark green potassium-rich slate, and potassium-rich crude rock with thickness greater than 27.1 m (Zhang Pengyuan, Li Shuangqing et al. , 1993) (Note: The majority of other authors said the ore layer is H_8, the overlying rock is H_9). The dolomite dolomite is 18km wide and 2km wide in the north and south. The middle part of the dolomite in the mined dolomite is 500 ~ 700m thick and thinner to the east, only 50m thick at the east, 100m thick at the west and 100 ~ 200m thick at the southern (Bai et al 1996) . Iron ore is mainly in the eastern part of the country, with two large ore bodies, the East Mine and the Main Mine, while in the west