A COUPLED MODEL INCORPORATING LOWER-CRUSTAL FLOW IN RESPONSE TO POST-RIFT SEDIMENTARY LOAD OF YINGGEHAI BASIN'S RAPID SUBSIDENCE

Yinggehai Basin is located in the junction area between Indo-China continental block and northern continental margin of South China Sea.Dynamical mechanism for generation and evolution of Yinggehai Basin has become the debate focus due to its complicated tectonic setting,research on the dynamical mechanism of basin's rapid subsidence is the key to solve this problem.Through comparing the history of post-rift rapid subsidence of Yinggehai Basin to the corresponding lift history of Dianxi Plateau,and combined with a coupled model incorporating lower-crustal flow in response to post-rift sedimentary load,it is drawn a conclusion that three tectonic evolution phases of the Yingehai Basin's post-rift rapid subsidence are.rapid subsidence phase,relative stable phase and accelerating subsidence phase.