The east of Junggar Basin has undergone multi-stage tectonic movements since the Carboniferous.Its sedimentary center migrated several times and the strata suffered multiple stage erosion.In order to reveal the relationship between stratigraphy and basin evolution

we described the distribution of unconformity based on the interpretation of seismic profile covering the whole basin

and analyzed the tectonic dynamic conditions during unconformity formation.The results show that there are five regional unconformities in the eastern Junggar Basin.They are respectively located on top of the Lower Carboniferous

and at the bottom of the Middle Permian

the bottom of the Cretaceous

the bottom of the Paleogene and the bottom of the Neogene.Accordingly

the Carboniferous-Quaternary of the eastern Junggar Basin can be subdivided into six tectonic layers

namely the Lower Carboniferous

Upper Carboniferous-Lower Permian

Middle Permian-Jurassic

Cretaceous

Paleogene

and Neogene-Quaternary structural layers.From the Late Carboniferous to the Quater-nary

the area experienced five evolutionary stages in total.In the Late Carboniferous

the intra-continental tectonic defor-mation cycles appeared in the area;in the Hercynian

the continental basin formed initially

and in the Mesozoic-Cenozoic

superimposition of the Indosinian

Yanshan and Himalayan movements occurred in a row.The multi-phased and multi-section activities of Kelameili Mountain and Bogda Mountain

and the repeated reactivation of faults within the basin directly led to the tectonic layer superimposition and multistage evolution of Junggar Basin.