柴达木盆地北部地区,第三系地层中有一种杂色泥岩,根据产状及分析资料,这种杂色泥岩的成因,主要是后生作用期的氧化、还原作用所致。根据成因可分为氧化型、还原型、氧化-还原型三种类型。不同的岩相带有不同的杂色泥岩,以辫状河沉积区和滨湖平坦区最易形成,因此,在岩相研究中有一定的指相意义。 In the northern Qaidam Basin, there is a variegated mudstone in the Tertiary strata. According to the occurrence and analysis data, the origin of this variegated mudstone is mainly due to oxidation and reduction in the epigenetic period. According to the causes can be divided into oxidation type, reduction type, oxidation - reduction type three types. Different lithofacies have different variegated mudstone, which is the easiest to be formed in braided river sedimentary area and lakeshore plain area. Therefore, there is a certain meaning in the study of lithofacies.