The diagenesis of late carboniferous carbonate rocks in the middle Yangtze area were mainly dolomitization

compaction pressure solution and dissolution

secondly recrystallization

cementation and locally dedolomitization

silification

desilification

pyritization

gypsification and degypsification. The various types of diagenesis were superposed

to different degrees

by karstification which could be identified by diagenetic composition

textures and structures. Based on the composition

textures and structures of diagenetics

oxygen and carbon isotopes

contents of minor elements and cathode luminescence of diagenetic components

the diagenetic environments could be distinguished into marin atmospheric fresh-water mix water and burial environment. During the formation and evolution of carbonate rocks

the superposition of different diagenetic environments and diagenetic types formed complicated diagenetic sequence and environmental association.