喜马拉雅运动：对川滇交界区古地理重建的制约和楚雄盆地的改造

简述了喜马拉雅运动三大变形幕的运动学特征并分析了在楚雄地区的反映。在剥去喜马拉雅运动的改造、把攀西地堑系和滇中海槽复原到建造时的位置后（楚雄盆地视作相对原地的）,以“盆”“山”耦合的思路重塑了古特提斯分支洋盆的演化及这些盆地的发育。川滇交界区尽管发生燕山运动,印支期建立起来的“盆”“山”耦合关系直至喜马拉雅运动才脱耦。分析了脱耦的各种表现及第四纪内继承的新构造运动对盆地保存和油气成藏的不利因素。

CONSTRAINING OF HIMALAYAN OROGENY ON PALINSPASTIC RECONSTRUCTION OF THE BORDER AREA OF SICHUAN AND YUNNAN PROVINCES AND REFORMATION OF CHUXIONG BASIN

The kinematic features of Himalayan orogeny of the thrusting eastwards, the strike slip faultings and the thrusting southwards, are described briefly, which has resulted in crustal shortening in both latitudinal and longitudinal directions. To strip the reformation of Himalayan orogeny and to restore the Panzhihua Xichang Graben System and the Central Yunnan Trough to their original positions (the Chuxiong Basin being regarded as in situ), the tectonic evolution of the border area of Sichuan and Yunnan Provinces is illustrated in the light of orogenic process (the Palaeotethysides was created) and coupled basin developing. Although the Yanshanian orogeny occurred, the orogen basin relation set up in the Indosinian orogeny was not decoupled until the Himalayan orogeny. All the three deformational episodes are reflected in the Chuxiong Basin, which took its shape, as a structural basin, during the Himalayan movement. The reformation was further strengthened by neotectonic activities which inherited the Himalayan structural modes. Based on the decoupling expressions, the unfavourable factors for the Chuxiong Basin's preservation and oil gas accumulation are analysed.