Different orders of unconformities in North Tarim Basin are resulted from tectonic movement

stress field transformation and sea level changes.According to multi order unconformities in stratigraphic record

the sequences of Sinian Paleozoic in the study area could be distingushed into 3 megasequences

9 supersequence sets and 39 third order sequences.Though the sedimentary environment

typical featrues of system tracts and distribution regularities of the 3 megasequences are different

the superposition patterns of the third order suquences are basically the same

that is

aggradation

transgression

regression and onlap associations.Based on chronostratigraphic framework

the Sinian Paleozoic could be divided into 3 mega cycles of sedimention.The unconformities between the mega cycles controlled the transformation of depositional pattern.