河南省偃龙铝土矿床晚石炭世古地理特征及其对铝土矿的控矿意义

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.

LATE CARBONIFEROUS PALEOGEOGRAPHY OF THE YANLONG BAUXITE DEPOSIT IN HENAN PROVINCE: Ore-controlling Significance

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.