The Late Paleozoic And Cenozoic Structural Deformation Characteristics And Tectonic Evolution In The Luo Cang Area, Tibet

The Qinghai Tibet Plateau has always been the focus and hotspot of geologists at home and abroad.In this paper,through the study of the structural deformation characteristics,deformation sequence,tectonic evolution and stress changes in the roo area,this paper tries to clarify the deformation mechanism,evolution characteristics,power source and stress change law in roo barn area,and provide some reference for the study of deformation mechanism,deformation sequence and structural evolution characteristics of the Qinghai Tibet Plateau.The structural line of the Luo Cang area is generally distributed in the direction of W-E,and the extension of the fold and fault is far away.On the whole,it is nearly squeezed by north-south direction,and the intensity of extrusion is different in different parts of space.Study area synclinorium deformational strength,core >South > North.A series of main folds and fault structures were formed in the area during the Hercynian compression.The deformation mechanism of push from north to south,blocking the Gangdese magmatic arc from South Bend,fold,or even fracture formation.At the end of Permian,the study area has been uplifted for a long time,and has developed to the largest scale deformation movement since the Paleocene.The tectonic deformation evolution of the study area is characterized by the formation(1)-(9)of the Hercynian movement.With the strengthening of the extrusion action in the middle and late stages of the Hercynian movement,the formation of the fold structure is formed,the extrusion action is strengthened,and the fracture of the middle rock formations is formed and the other shallow faults are formed.At the end of Permian,the research area was generally uplifted into ancient land,and the remaining part was residual sea.Later suffer fold movement strongly,the formation of Mesozoic Cenozoic basement in Cuoqin basin,an overall tectonic pattern of the South than in the north.With the closure of the ban Gong belt,the orogenic activity raised the study area to land,followed by further fold uplift and denudation,and the Triassic,Jurassic and Cretaceous strata were missing.Study on the tectonic evolution experienced a split ocean,ocean land conversion and land reform and block uplift of the geological evolution.The Carboniferous Middle Permian Cuoqin area experienced a complete process from down to uplift.The Carboniferous period has a strong extension.The late Middle Permian suffered strong folds movement and formed the basement of the Mesozoic Cenozoic basin in Cuoqin,and the late three fold Jurassic study area was mainly the southern uplift of the back arc foreland basin of the ban Gong Lake Nu River ocean basin.After the Cretaceous-the Palaeocene band was closed,the study area was generally uplifted as land and then entered.The uplift of the fold rises until the land is completely raised,leaving the marine environment.In the late Paleocene,the largest tectonic movement(Himalayan main curtain)was the main tectonic deformation stage.Eocene-Quaternary,north-south,continuous thrust and thrust nappe,forming Piedmont and mountain basins.Planation and whole plateau rapid uplift and denudation,accept.