四川盆地东北部飞仙关组白云岩成因分析

在综述四川盆地东北部飞仙关组白云岩成因研究现状及存在问题的基础上，通过对研究区内主要由泥—微晶白云石和细—中晶白云石组成的岩石进行岩石学特征、有序度特征、阴极发光特征、同位素特征的研究，并对成岩流体温度、古盐度分析，认为：主要由泥—微晶白云石组成的岩石，如泥—微晶白云岩、藻纹层白云岩等，这类岩石的白云石化作用为准同生白云石化作用；而主要由细—中晶白云石组成的岩石，如晶粒白云岩、鲕粒白云岩、残余鲕粒白云岩等，这类岩石的白云石化作用是由埋藏白云石化作用引起。通过对锶同位素的聚集分布规律分析后认为，该埋藏白云石化作用发生在一个封闭体系中。

An Analysis of the Feixianguan Formation Dolomite Origin in Northeastern Sichuan Basin

On the basis of the overview of status and problems of Feixianguan Formation dolomitite origin in the NortheasternSichuan Province，through the study of the micrite-microcrystalline dolomite and fine grain-microtek dolomite’s petrologicalfeatures，degree of order characteristics，cathodoluminescence characteristics，isotopic，and the diagenetic fluid temperature，paleosalinity：we think that dolomitization of rocks formed by the microcrystalline dolomite，such as micrite- microcrystallinedolomitite，algal-laminated dolomitite，etc.，are Quasi-syngenetic dolomitization，but dolomitization of rocks mainly composedof the fine grain-microtek dolomite，like crystalline dolomitite，oolitic dolomitite，etc.，are formed by burial dolomitization，The analysis of the distribution features of strontium isotope we come to the conclusion that the burial dolomitization occurredin a closed system.