摘要
There is still no consensus on the mechanisms that have led to the growth and rise of the 3 10 6km\+2 wide and 5000m high Tibet plateau.In one class of models,the whole lithosphere is inferred to deform as a thin viscous sheet.Concurrent thickening of the crust and lithospheric mantle over a vast area absorbs most of the plate convergence.In the thickest region (Tibet),topographic rebound is subsequently triggered by convective removal of the thickened mantle.This is followed by relief collapse and extension.The rebound has a profound effect on climate.Only the final collapse is associated with strike\|slip faulting,which is thus seen as a shallow and minor side\|effect.In another class of models,strain localization along lithospheric shear zones,and decoupling between mantle and crust,are thought to govern the deformation of Asia.Strike\|slip faulting and thrusting combine to cause diachronic uplift of Tibet soon after the onset of collision.The crust thickens but the mantle beneath subducts.At any given time,a small number of boundaries extending to the base of the lithosphere absorb much of the convergence.
There is still no consensus on the mechanisms that have led to the growth and rise of the 3 10 6km\+2 wide and 5000m high Tibet plateau.In one class of models,the whole lithosphere is inferred to deform as a thin viscous sheet.Concurrent thickening of the crust and lithospheric mantle over a vast area absorbs most of the plate convergence.In the thickest region (Tibet),topographic rebound is subsequently triggered by convective removal of the thickened mantle.This is followed by relief collapse and extension.The rebound has a profound effect on climate.Only the final collapse is associated with strike\|slip faulting,which is thus seen as a shallow and minor side\|effect.In another class of models,strain localization along lithospheric shear zones,and decoupling between mantle and crust,are thought to govern the deformation of Asia.Strike\|slip faulting and thrusting combine to cause diachronic uplift of Tibet soon after the onset of collision.The crust thickens but the mantle beneath subducts.At any given time,a small number of boundaries extending to the base of the lithosphere absorb much of the convergence.
出处
《地学前缘》
EI
CAS
CSCD
2000年第S1期365-365,共1页
Earth Science Frontiers
