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《中国科学(D辑:地球科学)(英文版)》 2003-07
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An experimental study on semi-brittle and plastic rheology of Panzhihua gabbro

HE Changrong 1, ZHOU Yongsheng ()1 & SANG Zunan )1,2 1. Institute of Geology and Laboratory of Tectonophysics, China Seismological Bureau, Beijing 100029, China; 2. College of Management, China University of Geosciences, Wuhan 430074, China  
We have carried out a systematic experimental study on semi-brittle and plastic deformation of fine-grained Panzhihua gabbro under dry condition with temperature range of 700—1100℃, confining pressure of 450—500 MPa, and strain rate of 1×10-4—3.1×10-6 s-1, using a triaxial testing system with a Griggs type solid medium pressure vessel. In terms of the parameters in the flow law and microstructure after deformation, the rate-dependent deformation can be categorized into three modes: (i) In temperature range of 700—800℃, the deformation is accommodated by semi-brittle flow, with activation energy Q = 612 12 kJ/mol, and stress exponent n = 14.6. The deformation in microscopic scale corresponds to the dislocation glide accompanied with microfracturing. (ii) In temperature range of 900—950℃, the predominant deformation mechanisms in this phase are mechanical twinning and dislocation glide, with activation energy Q =720 61 kJ/mol, and stress exponent n = 6.4. (iii) In temperature range of 1000—1150℃, the major deformation mechanisms are dislocation glide and dislocation climb with minor processes of partial melting, with activation energy Q = 699 55 kJ/mol and stress exponent n = 4.1. The microstructure and deformation mechanism of our experiments are comparable to the results of clinopyroxene and diabase as observed in previous studies. The flow stress of a mafic lower crust is calculated based on the rheological parameters of dry fine-grained gabbro, which implies that a lower curst with mafic granulite may be brittle, and it is possible to fracture and produce frictional slips. This may be an important implication for earthquake nucleation in the lower crust.
【CateGory Index】: P584
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【References】
Chinese Journal Full-text Database 4 Hits
1 Zhou Yongsheng1, He Changrong1, Li Haijun2 1.State key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029,China2.School of Geoscience and Space Science,Peking University,Beijing 100871,China;The effect of melt distribution on the rheology of rocks.[J];Earth Science Frontiers;2008-03
2 Zhou Yongsheng1, He Changrong1, Huang Xiaoge2, Song Juan1, Sang Zunan3, Kong Hua4 1.State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China2.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China3.China University of Geosciences(Wuhan), Wuhan 430074, China4.Central South University, Changsha 410083, China;Rheological complexity of mafic rocks and the effect of mineral component on creep of rocks[J];Earth Science Frontiers;2009-01
3 CHEN XiaoDe LIN ChuanYong SHI LanBin Institute of Geology,China Earthquake Administration,Beijing 100029,China;Deformation microstructures of lower crustal granulite xenoliths from Hannuoba Cenozoic basalts,China and their geologic implications.[J];Acta Petrologica Sinica;2007-11
4 CHEN Yu-xiang1, 2, DU Jian-guo2, LIU Hong2, ZHANG Jian-ping3 (1. Institute of Geology, China Earthquake Administration, Beijing 100029, China; 2. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China; 3. College of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China);3D modeling of stress distribution at mineral grain boundaries at high temperature and high hydrostatic pressure[J];Journal of Central South University(Science and Technology);2010-01
【Co-references】
Chinese Journal Full-text Database 10 Hits
1 ZHOU Yong-sheng,HE Chang-rongina Earthquake Administration, Beijing 100029, China);The status of continental lithosphere rheology and experiments on creep of rocks at high temperature and high pressure[J];Progress In Geophysics;2004-02
2 Zhou Yongsheng1, He Changrong1, Li Haijun2 1.State key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029,China2.School of Geoscience and Space Science,Peking University,Beijing 100871,China;The effect of melt distribution on the rheology of rocks.[J];Earth Science Frontiers;2008-03
3 Tan Wenbin, He Changrong State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;Frictional sliding of pyroxene and plagioclase gouges in gabbro under elevated temperature and dry condition.[J];Earth Science Frontiers;2008-03
4 Shi Lanbin Lin Chuanyong Chen Xiaode (Institute of Geology, China Seismological Bureau, Beijing 100029) (Laboratory of Tectonophysics, China Seismological Bureau, Beijing 100029) Han Xiuling (Institute of Geology, Chinese Academy of Sciences, Beiji;A XENOLITH-DERIVED GEOTHERM FOR THE LOWER CRUST AND UPPER MANTLE BENEATH HANUOBA AREA, HEBEI PROVINCE, CHINA AND ITS GEOLOGIC IMPLICATIONS[J];SEISMOLOGY AND GEOLOGY;2000-01
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9 Chen Shaohai 1, Zhang Guohui 1, Zhou Xinhua 1, Sun Min 2, Feng Jialin 3 and Xie Manze 3 (1 Institute of Geology, Chinese Academy of Sciences, Beijing 100029; 2 Department of Earth Sciences, Hongkong University, Hongkong; 3 Department o;Petrological Investigations on the Granulite Xenoliths from Hannuoba Basalts, Northern Sino Korean Craton[J];ACTA PETROLOGICA SINICA;1998-03
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【Secondary References】
Chinese Journal Full-text Database 2 Hits
1 Zhou Yongsheng1, He Changrong1, Huang Xiaoge2, Song Juan1, Sang Zunan3, Kong Hua4 1.State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China2.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China3.China University of Geosciences(Wuhan), Wuhan 430074, China4.Central South University, Changsha 410083, China;Rheological complexity of mafic rocks and the effect of mineral component on creep of rocks[J];Earth Science Frontiers;2009-01
2 XU Li-li a,ZHANG Jun-feng b,c(a.Graduate School;b.Faculty of Earth Sciences;c.State Key Laboratory of GeologicalProcesses and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Rheological Properties of the Continental Lower Crust and Destruction Mechanism of the North China Craton[J];Geological Science and Technology Information;2009-06
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