华北克拉通北缘阴山—河套盆山体系构造差异与演化OA

The Yinshan-Hetao basin-mountain system along the northern margin of the North China Craton(NCC)is a key intracontinental deformation belt.Deciphering its structural contrasts and evolution is essential for understanding the mechanisms of intraplate orogeny.By integrating geological mapping,seismic tomography,joint gravity-magnetic-magnetotelluric inversion,apatite fission-track and(U-Th)/He low-temperature thermochronology,zircon U-Pb geochronology and geochemical tracers,we draw the following conclusions.1)The region preserves a continuous tectonic record from 1.96 Ga to the present,which can be subdivided into five stages:Paleoproterozoic collisional basement formation,Neoproterozoic Rodinia break-up,Mesozoic Indosinian compressional orogeny,Yanshanian extensional destruction with initial basin-mountain differentiation,and Cenozoic differential reactivation.2)The basin-mountain contrast is fundamentally caused by a sharp lateral change in lithospheric thickness during NCC destruction;a thermo-rheological boundary zone controls the present"compression in the west,extension in the east"pattern.3)Superimposed far-field effects of multiple plates drive structural differentiation:India-Eurasia collision supplies N-S compression,Pacific slab rollback induces back-arc extension,and the remnant Paleo-Asian oceanic slab modifies deep thermal structure.These three processes synergistically control the spatio-temporal migration of magmatism,deformation and sedimentation.This study provides a new multi-scale observational template for intraplate basin-mountain coupling in a cratonic destruction setting.