【摘要】 河南省偃龙铝土矿床是近年通过整装勘查新发现的超大型铝土矿床,通过对大量钻孔岩心数据的分析比较,认为区内存在障壁岛沉积相、浅湖-潟湖沉积相、潮坪-沼泽沉积相等3种主要类型沉积环境.铝土矿成矿过程中,在局部的障壁岛沉积相环境无沉积成矿;在浅湖-潟湖沉积相环境下容易沉积成矿,铝土矿的沉积厚度与浅湖-潟湖沉积相下含矿岩系的沉积厚度呈中度相关关系;在潮坪-沼泽沉积相受沉积环境条件的影响,沉积成矿的条件较差.偃龙地区晚石炭世古地理特征决定了含矿岩系的厚度,但不直接控制铝土矿成矿厚度,而是在其他成矿条件耦合作用下,古地理通过控制铝土矿的沉积环境间接控制铝土矿的形成.更多还原

【Abstract】 The Yanlong bauxite deposit is a recently discovered super-large bauxite deposit. By analysis and comparison of a large number of drill core data,it is considered that there existed three main types of sedimentary environment in the area,namely barrier island facies,shallow lake-lagoon facies,and tidal flat-swamp facies. In local barrier island environment,there is no sedimentary mineralization. It is easy to deposit and mineralize in the shallow lake-lagoon environment,in which the thickness of bauxite is moderately correlated with that of ore-bearing rock series. In the tidal flat-swamp environment,the conditions for sedimentary mineralization are poor. The paleogeographic characteristics of Yanlong area in Late Carboniferous determine the thickness of ore-bearing rock series,yet not directly control the mineralization thickness of bauxite. Instead, it indirectly controls the formation by affecting the sedimentary environment combined with other metallogenic conditions.更多还原