鄂尔多斯盆地古生界盖层主要为泥质岩、铝土岩、膏岩和致密碳酸盐岩。
The Palaeozoic caprocks in Erduosi Basin are mainly argillaceous rocks, aluminous rocks, gypsum rocks and dense carbonate rocks.
美国官员指出，这项政策所包含的九种原材料包括铝土岩、焦炭、萤石、镁、锰、碳化硅、结晶硅、黄磷和锌。
U. S. officials said the nine materials covered by their case were bauxite, coke, fluorspar, magnesium, manganese, silicon carbide, silicon metal, yellow phosphorus and zinc.
华北石炭纪岩溶型铝土矿的主要物质来源为下伏的晚寒武世—中奥陶世碳酸盐岩。
The material source of the Carboniferous karst type bauxite in North China mainly came from the underlying Late cambrian-middle Ordovician carbonate rock.
云南的铝矿资源丰富，主要矿产分为沉积型铝土矿和霞石正长岩铝资源两大类。
Yunnan Province is rich in aluminium mineral resources. Main minerals products can be divided into two types. That is, sedimentary bauxite and nepheline syenite.
本文认为孝义铝土矿物质来源主要是下伏奥陶系灰岩。
The authors suggest that the main material source of bauxite is originated from its underlying Ordovician limestone.
奥陶系风化壳上覆铝土质岩类，封盖条件好，有利于形成大型地层、岩性圈闭。
The Ordovician weathering crust has good sealing and covering conditions of aluminum rock on the top, favorable for formation of large-scale stratum and lithologic trap.
奥陶系风化壳上覆铝土质岩类，封盖条件好，有利于形成大型地层、岩性圈闭。
The Ordovician weathering crust has good sealing and covering conditions of aluminum rock on the top, favorable for formation of large-scale stratum and lithologic trap.
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