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渝南地区红土风化原地残积-搬运再沉积型铝土矿是渝黔地区铝土矿的重要组成部分,因含矿层位横向上变化多端,不同矿区的沉积时代存在比较大的差异。渝南大佛岩矿区代表剖面顶部炭质页岩存在8种指示早石炭世的具环孢子,以及7种具囊和单沟的花粉再沉积组合,但未见指示早二叠世早期的科达类花粉Florinites出现。据此孢粉组合特征,认为大佛岩矿区顶部炭质页岩的部分物源区的沉积时代早于晚石炭世早期,本区铝土岩(矿)的部分物源有可能来自早于晚石炭世早期沉积的底板地层。结合区域地质背景,认为渝南地区铝土矿含矿岩系是一个穿时性地层单位。
The red clay weathered in situ in the south of Chongqing area is a residual sediment-carrying redeposited bauxite is an important part of the bauxite in Yuqian area. Due to the lateral variation of the ore-bearing strata, the depositional ages of different mining areas are quite different. There are eight kinds of pollen redepositions indicating Early Carboniferous, as well as seven kinds of cysts and single ditch in the carbonaceous shale at the top of the representative section of the Dafo rock in Yu’nan. However, there is no indication of the early Early Permian Keda Pollen Florinites appear. According to the characteristics of sporopollen assemblages, it is believed that the depositional time of some source areas of the top carbonaceous shale in the Dafo rock mining area is earlier than that in the early Late Carboniferous. Some sources of bauxite (ore) in this area may come from the early Carboniferous Early sedimentary floor strata. Combined with the regional geological background, it is considered that the bauxite ore-bearing rock series in the south of Chongqing are a stratigraphic unit.