Abstract: In literature [1] Thrust Belt Structure and Significance for Petroleum Exploration in Hala'alat Mountain in Northwestern Margin of Junggar Basin, the Triassic and Permian strata in Heshituologai basin, which were used for supporting its proposed tectonic patterns, are in big differences compared with the actual geologic data. Also, it was concluded by above paper that the deformation of Hala'alat thrust belt originated from the Late Triassic, inherited at the Late Jurassic and ceased after the Cretaceous. The authors in this paper argue that the most intensive deformation of lower structural zone in that pattern should originate mainly from the Cenozoic, and it is the neotectonic movement that transforms intensively all previous tectonic movement evidences, resulting in the difficulties for recovery of previous tectonic/structural deformation in this area.

Key words: Junggar basin, northwestern margin, Hala'alat mountain, tectonic pattern, structural zone, thrust belt, unconformity