CRUST UPLIFT AND ITS IMPLICATIONS IN THE JIAODONG PENINSULA, EASTERN CHINA

Abstract

Significant crust uplift and erosion are common processes in response to geological crises. Our study on emplacement depth of Mesozoic granites and gold deposition in the Jiaodong Peninsula of eastern China, respectively, indicate that during the early cretaceous from 140 Ma to 110 Ma, crust was uplifted and eroded totally for about 7km, in contrast with no more than 4 km since 110 Ma up to now. The large displacements, Coupled with the lithospheric thinning in eastern China, may be response to delamination of the weakened lower crust which had higher density than that of the sublithosphere after volume of adkitic magma generated, meanwhile, coupled with deep process of mantle upwelling triggered by paleo-pacific subduction in the early Cretaceous.