Cenozoic strike slip orogeny in Sanjiang area, Southwestern China

This paper systematically discusses the characteristics of strike slip shear zones, regional extensions and metamorphic core complexes, Cenozoic basins, and alkaline magmatic activities in the process of strike slip in Sanjiang area of Southwest China. It is considered that Sanjiang area has experienced five temporal and spatial evolution stages:the compression contraction deformation period (60-40Ma), strike slip extension thermal uplift period (40-38Ma), shear deep melting period (38-23Ma), strike slip shear extension period (23-11Ma), and strike slip denudation uplift period (11-5Ma), corresponding to five kinds of motion mechanism and dynamic system:collision and compression, strike slip tension thermal uplift (magma), strike slip shear deep melting, shear extension, strike slip collapse, which are mainly manifested as strike slip orogeny. The Sanjiang Orogenic Belt in Southwest China is the result of the oblique subduction of the Indian plate to the Eurasian plate, forming a number of giant clockwise strike slip shear zones in which the blocks escape to the South and rotate clockwise. The strike slip fault system plays a role in orogeny in the form of displacement adjustment and structural transformation, and the Sanjiang Orogenic Belt in Southwest China is a typical strike slip orogenic belt.