中扬子台地北缘灯影组碳酸盐岩成岩作用序列及成岩模式

研究区主要的成岩作用类型有胶结、溶解、硅化、白云石化、压实-压溶和去白云石化作用等，详细研究了每种成岩作用的矿物岩石学特征及对孔隙形成、演化的影响。把研究区成岩环境划分为大气淡水成岩环境、海水成岩环境、混合水成岩环境、埋藏成岩环境和晚期表生成岩环境五大类．总结了每种成岩环境的成岩组构特征、成岩标志、δ18O和δC及微量元素Na+、Sr2+的分布规律。此外，还探讨了深水斜坡相粉-细晶白云岩和台地浅滩相颗粒白云岩的成岩演化序列与孔隙演化，最后概括出了研究区碳酸盐岩的成岩作用模式。

THE CARBONATE DIAGENETIC MODEL AND SEQUENCE OF THE DENGYING FORMATION (UPPER SINIAN) ON THE NORTHERN MARGIN OF THE MIDDLE YANGTZE PLATFORM

The diagenetic types in the study area include cementation, dissolution, silicification, dolomitization, compaction-compactional dissolution and dedolomitization. The mineralogical and lithological characteristics and their influence on the pore formation and evolution were studied for different types of diagenesis. The diagenetic environments were classified as meteoric environment, marine water environrnent, mixing water environment, deep-buried environment and epidingenetic environment. The diagenetic textures, diagenetic indicators, δ18O and δ13C, and trace element distribution of Na+ and Sr2 + were summarized for each diagenetic environment. The diagenetic opuences and POre evolution ofdeep slope silty crystalline dolomite and granular dolomite from shoals were discussed, and finally, thediagenetic model of carbonate rocks in the study area were summarized.