首页|Structural Geology and Chronology of Shear Zones along the Shangdan Suture in Qinling Orogenic Belt,China:Implications for Late Mesozoic Intra-Continental Deformation of East Asia
Structural Geology and Chronology of Shear Zones along the Shangdan Suture in Qinling Orogenic Belt,China:Implications for Late Mesozoic Intra-Continental Deformation of East Asia
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The Shangdan suture zone(SDZ)in the Qinling orogenic belt(QOB)is a key to under-standing the East Asia tectonic evolution.The SDZ gives information about convergent processes be-tween the North China Block(NCB)and South China Block(SCB).In the Late Mesozoic,several shear zones evolved along the SDZ boundary that helps us comprehend the collisional deformation between the NCB and SCB,which was neglected in previous studies.These shear zones play an essential role in the tectonic evolution of the East Asia continents.This study focuses on the deformation and geochro-nology of two shear zones distributed along the SDZ,identified in the Shaliangzi and Maanqiao areas.The shear sense indicators and kinematic vorticity numbers(0.54-0.90)suggest these shear zones have sinistral shear and sub-simple shear deformation kinematics.The quartz's dynamic recrystallization and c-axis fabric analysis in the Maanqiao shear zone(MSZ)revealed that the MSZ experienced defor-mation under green-schist facies conditions at ∼400-500 ℃The Shaliangzi shear zone deformed under amphibolite facies at～500-700℃.The 40Ar/39Ar(muscovite-biotite)dating of samples provided a pla-teau age of 121-123 Ma.Together with previously published data,our results concluded that QOB was dominated by compressional tectonics during the Late Early Cretaceous.Moreover,we suggested that the Siberian Block moved back to the south and Lhasa-Qiantang-Indochina Block to the north,which promoted intra-continental compressional tectonics.
State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an 710069,China
Institute of Geology,University of Punjab,Lahore 45590,Pakistan
Institute for Ecological Research and Pollution Control of Plateau Lakes,School of Ecology and Environmental Science,Yunnan University,Kunming 650504,China
国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金State Key Laboratory of Continental Dynamics, Northwest University, Xi'an
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