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《Chinese Journal of Geophysics》 2014-08
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Exhumation process of Middle-Upper Yangtze since Cretaceous and its tectonic significance:low-temperature thermochronology constraints

SHI Hong-Cai;SHI Xiao-Bin;CAS Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
A total of 60 new apatite fission track(AFT) data from Middle-Upper Yangtze block provide a database to evaluate the Late Mesozoic and Cenozoic denudation and cooling history of Middle-Upper Yangtze block on a regional scale;combined with the previous published AFT data,the temporal-spatial correlation is preliminarily constructed between regional Cenozoic tectonic activities and intra-continental deformation.The difference in denudation or cooling history among each part is regionalized and successive in space,and is episodic in time.It was first deformed and folded in Jianghan bansin and Huangling uplift,and then the onset timing of formation becomes later from N(E) to S(W) in Micasngshan and Dabashan,while others become later from southeast to northwest,including Xiang exi,east and northeast Sichuan basin,which stands for the characteristics of spatial variation.Episodic characteristics of tectonic movement in time are mainly shown as alternative rapid cooling processes and slow cooling processes.The age of the AFT from different geological units in Micang shan and Daba shan becomes smaller from N(E) to S(W),which means that it was controlled by the thrusting compression of QinlingDabie orogen in Late Mesozoic and Cenozoic;while the age of the AFT from Xiang'exi,east and northeast Sichuan basin becomes smaller from southeast to northwest,standing for the far-field effect of subduction of Pacific plate.The rapid exhumation and cooling event in Late Cenozoic was atributed to uplifting and the northeastward growth of the Tibetan Plateau and onset of the Asian monsoon.The systematic analysis of AFT can provide geochronological constraints on the progressive expansion tectonic deformation of the Middle-Upper Yangtze block.
【Fund】: 中石化海相前瞻性课题(YPH08057)资助
【CateGory Index】: P534.53;P512.2
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