黔中铝土矿集区作为中国重要的铝工业基地，含铝岩系主要为下石炭统九架炉组，矿床类型属沉积型铝土矿。蔡家坝铝土矿床是近年在黔中地区开展铝土矿精查工作时新发现的隐伏的沉积型铝土矿床，研究了该铝土矿床在成矿过程中相关的古气候条件、沉积环境以及成矿物质来源等问题。结果表明，含铝岩系上部铝土岩主要呈泥质结构，主要由高岭石和伊利石组成；中部铝土矿主要呈碎屑状和隐晶质结构，以及少量的鲕粒结构，主要由硬水铝石和伊利石组成；下部铁质岩主要呈隐晶质结构，主要由赤铁矿组成。蔡家坝铝土矿床含铝岩系整体主要形成于陆相环境，且含铝岩系上部铝土岩层和中部铝土矿层主要形成于相对氧化的环境，而下部铁质岩层则主要表现出相对还原的环境。同时，含铝岩系的下部铁质岩和中部铝土矿主要形成于炎热潮湿的古气候条件，而上部铝土矿则为温暖湿润气候条件下的产物。成矿物质来源研究表明，蔡家坝铝土矿床含铝岩系主要来源于下伏寒武系清虚洞组白云岩和灰绿色黏土岩夹层。对指导该区铝土矿的找矿勘探具有重要意义。

As an important aluminum industrial base in China, the bauxite concentration area in central Guizhou Province is hosted within the Lower Carboniferous Jiujialu Formation, and the deposit type belongs to the sedimentary bauxite. The Caijiaba bauxite deposit is a newly discovered bauxite deposit during the fine investigation of bauxite in central Guizhou Province in recent years. The paleoclimatic conditions, sedimentary environment and metallogenic provenance related to this bauxite deposit in the metallogenic process were studied. The results show that the upper bauxitic claystone of the Al-bearing rock series is mainly pelitomorphic texture and is mainly composed of kaolinite and illite. The middle bauxite ore is mainly clastic and cryptocrystalline textures, followed by a small number of ooidal texture, which is mainly composed of diaspore and illite. The lower ferruginous rock is mainly cryptocrystalline texture and is mainly composed of hematite. The Al-bearing rock series of the Caijiaba bauxite deposit is mainly formed in the continental environment, and the upper bauxitic claystone and middle bauxite ore layers are mainly formed in a relatively oxidized environment, while the lower ferruginous rock layer mainly shows a relatively reduced environment. Meanwhile, the lower ferruginous rock and middle bauxite ore layers are mainly formed in hot and humid paleoclimatic conditions, while the upper bauxitic claystone layer is the product of warm and humid climatic conditions. Research on the sources of ore-forming materials indicates that the Al-bearing rock series of the Caijiaba bauxite deposit is mainly derived from the dolomite and interbedded gray-green claystone of the Lower Cambrian Qingxudong Formation. The results are of great significance in guiding the exploration and prospecting of bauxite deposits in this area.