我国古生代铝土矿矿石结构构造成因命名及矿床命名问题

A Discussion on Origin of Palaeozoic Bauxite Ore Textures and Structures and Bauxite Deposit Names in China

我国古生代铝土矿矿石的结构、构造及矿物组成均具有红土化风化作用形成的特点,与水体中形成的或机械碎屑沉积的完全不同,它是古风化壳铝土物质,与现代风化作用形成的红土铝土矿矿石的结构、构造、矿物组合、同位素组成等均相同,都不是水体中形成的或机械碎屑沉积。因此作者建议将这种铝土矿命名为古风化壳铝土矿为宜。这类矿石的结构、构造命名为红土豆、红土鲕、红土结核、红土结石、红土碎屑、红土碎块等,使之更具成因意义。

There are now two quite different opinions of the origin of palaeozoic bauxite in China : sedimentary hypothesis and ancient weathered crust hypothesis. The point at issue is textures and structures of bauxite ores and whether the mineral composition is weathering or sedimentary in water body , In the writer' s opinion , the textures and structures of palaeozoic bauxite ores and the mineral compositions are of the formation features of laterite slacking, rather than the formation features in water body or the formation features of mechanic claste sedimentation, but identical with the textures, structures, mineral assemblages, isotopic compositions of laterite bauxite formed under the action of modern weathering , belonging to ancient weathered crust bauxite matter. Therefore, the writer suggests that this kind of bauxite be named ancient weathered crust bauxite deposit or ancient laterite bauxite deposit and the names of the bauxite ore textures and structures be added'lateritic' , such as lateritic pisolite, lateritic oolite, lateritic concretion, lateritic nodular, lateritic claste and lateritic boulder, so as to be differentiated from the bauxite formed in water body or in mechanic claste sedimentation.