The Rationality of Mixed Water Dolomitization and Buried Dolomitization——Taking the Genesis of Dolostone of Feixianguan Formation in the Sichuan Basin as an Example

人们对白云石的研究已有200多年的历史，但关于白云岩的成因仍然存在很大的争议。目前国内对白云岩成因的研究主要停留在对国外提出的白云石化模式的套用阶段。以四川盆地飞仙关组部分白云岩成因为例，早期学者多倾向于用混合水白云石化模式解释其成因，近几年又有学者提出了埋藏成因，并对其白云石化流体性质作了具体研究。本文以四川盆地飞仙关组白云岩为例，从引发飞仙关组白云岩成因争议的岩石学特征、地球化学特征展开讨论，分析这两种成因模式的争议点所在，以期寻找到混合水白云石化和埋藏白云石化作用的是与非，为更进一步研究白云岩的成因提供一定参考。 Although researches on dolomite have been lasting for more than 200 years, there are still many disputes about the genesis of dolostone, and nowadays’ domestic researches in this field just confine to mechanical application of foreign dolomitization models. Taking part of dolostone of Feixianguan Formation in the SichuanBasinas an example, early researchers tended to consider it as the result of mixed water dolomitization, while in recent years, some scholars came up with the idea of buried causes and studied dolomitization fluids carefully. Based on the discussion of the petrological and geochemical characteristics of dolostone in Feixianguan Formation, this study analyzes the clashes of these two types of genetic model of dolostone, hoping to work out the rationality of mixed water dolomitization and buried dolomitization, which will provide a reference for further research on dolostone genesis.