四川盆地及其周缘地区下二叠统碳酸盐岩中，不同程度地发育着一些细晶至粗晶白云岩和白云质灰岩，前人将其解释为淡水透镜体混合白云石化的产物。根据野外及室内薄片观察，并结合阴极发光、碳氧稳定同位素、地球化学分析、包体均一温度和有序度的综合研究，认为这类白云岩主要是由埋藏白云石化作用形成的。 In the Lower Permian carbonate rocks of the Sichuan Basin and its peripheral regions, some fine-grained to coarse-grained dolomites and dolomitic limestones are developed to some extent, which were formerly interpreted as the product of mixed dolomitization of freshwater lenses. Based on the field and in-situ thin-sheet observations, combined with the studies of cathodoluminescence, carbon-oxygen stable isotopes, geochemical analyzes, homogenization temperature and degree of inclusions, it is believed that these dolomites are mainly formed by burial dolomitization.