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《Earth Science》 2017-12
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Deformation Fabrics and Rheological Features of Early Permian Fanjiatun Formation from Quannongshan Area,Southeastern Changchun

Liang Chenyue;Liu Yongjiang;Zhu Jianjiang;Li Weimin;Chang Ruihong;Zhang Li;College of Earth Sciences,Jilin University;Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Land and Resources,Jilin University;School of Earth and Space Sciences,Peking University;Shenyang Geological Survey Center,China Geological Survey;  
The Quannongshan area is located in the southeastern part of Changchun,at the junction of the Jiamusi-Yilan fault belt and Xar Moron suture zone.Detailed field observations indicate strong ductile deformation event which developed in these mylonites:Lower Permian Fanjiatun Formation(P1 f)calc-mylonites and the intrusive Yanshanian granitic mylonites.Most rocks were deformed to protomylonites and mylonites macroscopically in a gneissic-like structure.The major strain type is planstrain and marked by much compression,which is general compression.And the deformed rocks are characterized by L=S type tectonites demonstrating a strong tectonic condition of a compressive ductile shear zone.A variety of macro/micro-ductile deformation kinematic marks indicate a significant sinistral shearing.Based on detailed macro/microstructural analysis,quartz c-axis EBSD fabrics,calcite-dolomite geothermometer from electron probe,calcite e twin morphology and quartz/feldspar deformation behaviors,a low-temperature plastic flow characteristics and greenschist metamorphic environment were estimated.The ductile shear zone has a relatively high strain rate,which is between 10-6.95 and 10-8.89 in a highly strained zone and10-9.25-10-12.17 away from the strong deformation zone.The lower limit of the differential stress during the mylonization process should be approximately 51.27-65.46 MPa,which represents that the mylonitization formed at a slightly faster strain rate with low deformation temperature and moderate strain strength.In the initial deformation period,the pressolution diffusion and the twin gliding are the main deformation mechanisms,then in the middle of the deformation they are dominated by the twin gliding and the grain boundary slip.In the late stage of the progressive deformation,the grain boundary sliding occurred in parts of strong stain zone.The formation of this ductile shear zone might be related to the Izanagi plate obliquely NNW subducting under the Eurasia plate during the middle and late Early Cretaceous,which is a local performance of the sinistral strike-slip Jia-Yi fault.
【Fund】: 国家自然科学基金项目(Nos.41230206 41602211)
【CateGory Index】: P534.46;P584
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