先锋盆地系第三纪时期构造成因的拉分盆地,盆地内沉积了褐煤和硅藻士,均具有工业价值。本文分析了盆地的成因,探讨了煤与硅藻土的聚积条件和分布规律。煤与硅藻土的聚积和分布是受当时的地质构造、基岩岩性、地理环境、气候与植物条件的制约。(1)沉积盆地的东部,为平缓开阔的斜坡带,由于水较浅,水动力条件较弱,利于泥炭沼泽的富集和硅藻的繁殖,故成为褐煤与硅藻土的主要聚积分布区。(2)盆地的南部,为一陡坡,因水深,边缘中的冲、洪积扇发育,粗粒碎屑沉积灌度快,水动力条件强,不利于煤和硅藻土的形成。(3)盆地的中心,长期处于湖水较深,湖底光线较暗,为一弱还原环境,它可以溶解硅藻,而不利于硅藻的大量繁殖及其残骸的保存,因而也不利于煤与硅藻土的形成。最后,就先锋盆地的成矿地质条件,分析了在省内寻找硅藻土矿的地质前提。 Pioneer Basin is a structural division of the Triassic pull the basin, basin deposition of lignite and coker, are of industrial value. This paper analyzes the genesis of the basin and discusses the accumulation conditions and distribution rules of coal and diatomite. The accumulation and distribution of coal and diatomite are controlled by the geological structure, bedrock lithology, geography, climate and plant conditions at that time. (1) In the eastern part of the sedimentary basin, there is a gentle and open slope zone. Due to the shallow water and weak hydrodynamic conditions, it is conducive to the enrichment of peat swamps and the propagation of diatoms, so it becomes the main accumulation distribution area of ​​lignite and diatomite . (2) In the southern part of the basin, there is a steep slope. Due to the deep water, the flushing in the edge and the alluvial fan, the rapid sinking of coarse-grained clasts and strong hydrodynamic conditions are unfavorable to the formation of coal and diatomite. (3) In the center of the basin, the lake is deep for a long time, and the light at the bottom of the lake is dark. It is a weakly reducing environment that can dissolve diatoms, which is not conducive to the massive breeding of diatoms and the preservation of their remains. Formation of diatomaceous earth. Finally, the geologic conditions of the Pioneer Basin are analyzed, and the geological prerequisites for looking for diatomite mines in the province are analyzed.