Everest Tectonic Paleomagnetism And Magnetic Fabric Study And Himalayan Uplift

Aiming at the characteristics of many inconsistent standpoints about geological research in Himalayan terranes, this paper sets out from the magnetism, studies the rock magnetic fabrics and magnetotectonics in systematic details, puts forward the new plateau uplifting model, acquires main progressive cognizance below:1.On the basis of metamorphic petrology, combined with structural geology, geochronology, magma petrology and the geophysical data in the depths of the Earth, the inverted metamorphic episodes is did the detailed contrast research for in the higher Himalayan crystallines. The results suggest, there are only a pair of normal and abnormal ductile shear zones, which are active in the meantime, the channel flow or the ductile extrusion takes place in the Higher Himalayan crystallines. However, since Cenozoic, at the macro view or microscope, rock fabrics or magnetic fabrics, there are at least two-phase deformations in MCT and STDS: The earlier period, a strong thrust toward to the south from the north; The later period, tilting, extending toward the north from the south.2. The results of magnetic fabrics research have demonstrated that the combination of NS-directed compressional stress and NWW-trending structural plane resulted in the strike-slipping shear of dextral ductile oblique thrusting, rapid uplifting of mountain masses and high topographic reliefs on the Higher Himalayan crystallines. The locally developed elongated magnetic ellipsoids indicate that the combination of gravitational potential energy of the mountain masses and northward compressional force caused by the Indian plate led to nearly NS-trending extension and collapse, and the formation of a dextral ductile shear zone similar to tilted structures. The formation of the inverted metamorphic episodes and STDS result from thrusting and tilting together.3. Applying modern metamorphic petrology and modern structural geology, combining with magnetic fabrics and rock fabrics, the results suggest the inverted metamorphic episodes and the south Tibet detachment system came from thrusting and tilting in the higher Himalayan crystallines. In south Tibet, thrusting and tilting is perhaps alternate. The alternative moves maybe give rise to rising stage by stage in the Himalayan mountains, and it is one of these reasons of the deformation, metamorphism, magmatic activity, which possess multi-phases in Higher Himalayas.4.The new magnetotectonic data suggest that the Himalayan terrane is wandering...