CHARACTERS OF COUPLING BETWEEN MESOZOIC SEDIMENTARY BASIN AND OROGENIC BELT IN SICHUAN OVERLAIN BASIN AND ITS ADJACENT AREA

Sichuan overlain basin is located among the Jiangnan, Qinling-Dabie and Longmen orogenic belts, and at the juncture among ancient Asia, Circum-Pacific and Tethys. It has undergone four basin generation episodes, i.e., marine basin, coal basin, continental basin and relict basin, since Mesozoic. The sedimentary filling processes in the basin can be generalized as three modes, i.e., foreland, depression and reactivated basin. On the basis of analysis of the tectonic evolution, kinematics and sedimentary filling of the basin together with its orogens, we discover the coupling between the movement period for the peripheral orogens of the basin and the formation period of the ancient uplift in the basin in terms of time, the coupling between the movement period of the peripheral orogens of the basin and the transformation period of sedimentary environment in the basin in terms of time, the coupling between the strike for the tectonic axis of the peripheral orogens and that for the tectonic axis of the piedmont depression or the foreland fold-fault belts in the basin, the coupling between the strike for the tectonic axis of the foreland fold-fault belts and that for the tectonic axis of the syntectonic sedimentary or depression center formed in different periods.