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2013, 32(2) 191-199 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Composition and structural characteristics of Archean granite in Chentaigou area of Anshan |
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LI Bin-1, JIN Wei-1, ZHANG Jia-Hui-1, WANG Ya-Fei-2, CA Li-Bin-1, WANG Qiang-Long-1 |
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1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� State Key Laboratory of Lithospheric Evolution��Institute of Geology and Geophysics��Chinese Academy of Sciences�� Beijing 100029��China |
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Abstract��
Mass of Archean granite rocks and metamorphic layered sequence exposed in Chentaigou area of Anshan are typical for studying Archean crustal formation and evolution�� We systematically divide the rock units and analyse their rock fabric and structural deformation characteristics of the Archean rocks��with focusing on their compositions and structural features��in the Chentaigou area�� Fine-grained trondhjemitic mylonite��porphyritic granitic mylonite and medium-fine grained granitic gneiss have the characteristics of the Paleoarchean granitic rocks�� and underwent ductile deformation of middle-deep crust level�� Fine-grained trondhjemite is a product of the Mesoarchean magmatic events��showing impervious deformation and partial of ductile-brittle deformation fabric�� Metamorphic layered rocks of the Anshan Group mainly recorded the Neoarchean strong deformation event of middleshallow crust level�� The intrusion of the medium-coarse grained muscovite granite marked the end of early-phase different structural deformation processes in the Late Neoarchean�� The formation and evolution of the Archean crust in the Chentaigou area are also discussed�� |
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Keywords��
granite
fabric
structural evolution
Archean
Chentaigou
Anshan
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Received Revised Online: |
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