GEODYNAMICS PROCESS IN THE JUNGGAR BASIN

The Junggar basin is surrounded by Paleozoic sutures and the mountains around the basin have been thrust toward the basin, showing that this basin has been in a long-continued, compressional regime.The change of volcanic rocks from marine facies to continental facies and change of volcanism from strong to weak indicate that after the Permian the upper mantle materials had long been in a constrictive stage, and that the whole basin sank continuously to receive deposits, thus resulting in crustal thickening.During the basin evolution stage in the Permian, the basin was affected by the late Hercynian, Indosinian, Yanshanian and Himalayan phases of tectonic stress fields, resulting in N-S extensional deformation, N-S and NW collisional compressional deformation, alternating N-S and NW extensional and compressional deformations and N-S compresso-shear, thrusting, strike-slip and gravitational sliding deformation, and finally a great variety of complex tectonic types were formed.