关键词: 川西地区, 前陆盆地, 早中生代, 晚中生代, 构造演化, 沉积作用, 走滑断裂带

Abstract: The studies on the regional tectonic evolution of foreland basin in the western Sichuan province showed that this basin underwent two epochs of tectonic evolution in the Early Mesozoic and Later Cenozoic respectively.The development of foreland basin,deformation characteristics of the foreland and the sedimentation of foredeep in the south and north parts of this foreland basin are all different distinctly.The gravity and magnetic data of the western Sichuan province and its adjacent areas were analyzed.Some new results of distribution and the basement features in the main fault zones were obtained.The rigid basement near Deyang-Mianyang area blocked the propagation of the Cenozoic deformation from south to north,and a series of northwest strike-slip faults further depressed the Cenozoic deformation.The difference of basement features and the existence of a series of northwest strike-slip faults resulted in the difference of the Cenozoic deformation between the north and the south parts.

Key words: western Sichuan province, foreland basin, Early Mesozoic, Later Cenozoic, tectonic evolution, sedimentation, strike-slip fault