首页|Structural,40Ar/39Ar Geochronological and Rheological Feature Analysis of the Guoxuepu Shear Zone:Indications for the Jitang Metamorphic Complex in the Northern Lancangjiang Zone

Structural,40Ar/39Ar Geochronological and Rheological Feature Analysis of the Guoxuepu Shear Zone:Indications for the Jitang Metamorphic Complex in the Northern Lancangjiang Zone

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  • 国家科技期刊平台
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The Jitang metamorphic complex is key to studying the tectonic evolution of the Northern Lancangjiang zone.Through structural-lithological mapping,structural analysis and laboratory testing,the composition of the Jitang metamorphic complex was determined.The macro-and microstructural analyses of the ductile detachment shear zone(Guoxuepu ductile shear zone,2-4 km wide)between the metamorphic complex and the overlying sedimentary cap show that the shear sense of the ductile shear zones is top-to-the-southeast.The presence of various deformation features and quartz C-axis electron backscatter diffraction(EBSD)fabric analysis suggests multiple deformation events occurring at different temperatures.The average stress is 25.68 MPa,with the strain rates(έ)ranging from 9.77×10-14 s-1 to 6.52×10-16 s-1.The finite strain of the Guoxuepu ductile shear zone indicates an elongated strain pattern.The average kinematic vorticity of the Guoxuepu ductile shear zone is 0.88,implying that the shear zone is dominated by simple shear.The muscovite selected from the protomylonite samples in the Guoxuepu ductile shear zone yields a 40Ar-39Ar age of 60.09±0.38 Ma.It is suggested that,coeval with the initial Indo-Eurasian collision,the development of strike-slip faults led to a weak and unstable crust,upwelling of lower crust magma,then induced the detachment of the Jitang metamorphic complex in the Eocene.

40Ar/39Ar datingstrain patternvorticityEBSDGuoxuepu shear zoneJitang metamorphic complex

FENG Yipeng、WANG Genhou、WANG Shulai、LI Dian、WANG Huan、LU Yang、LIU Han、ZHANG Peilie

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Beijing Institute of Geology for Mineral Resources Co.,Ltd.,Beijing 100012,China

School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China

College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China

Rock Analysis Laboratory,Regional Geology Survey Institute of Hebei Province,Langfang,Hebei 065099,China

Chengdu Center,China Geology Survey,Chengdu 610081,China

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China Geological Survey Scientific Research ProjectChina Geological Survey Scientific Research ProjectNational Natural Science Foundation of China

DD20190167DD2019005342172259

2024

10.1111/1755-6724.15119

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(1)
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