The Carboniferous sedimentary facies and sequence stratigraphy in the Gyironggou in Gyirong, Xizang

The Toumaisian and Visean deposits with a timespan of about 30 Ma developed in the Carboniferous strata in the Northern Himalaya stratigraphic subprovince in Xizang consist of two lithostratigraphic units:Yali and Naxing Formations, in which the tidal-flat, delta and shallow-marine shelf facies may be recognized. These stratigraphic sequences are involved in one supersequence, and consist of two I type sequences, seven II type (sequences) and two sequence sets, most of which are composed of the transgressive systems tract (TST) and highstand systems tract (HST).