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Rheological behavior of high temperature garnet-bearing migmatites: The Khondalite Belt example (North China Craton)

文献类型：期刊论文

作者Lobjoie, Cyril2; Trap, Pierre2; Oliot, Emilien3; Lin, Wei1; Barou, Fabrice3; Goncalves, Philippe2; Marquer, Didier2
刊名JOURNAL OF STRUCTURAL GEOLOGY
出版日期2020-02-01
卷号131页码:17
关键词Felsic migmatites Garnet deformation mechanisms EBSD Khondalite belt North China craton
ISSN号0191-8141
DOI10.1016/j.jsg.2019.103910
英文摘要The contribution presents microstructural and petrological results obtained on garnet-bearing felsic migmatites from the Khondalite Belt (North China Craton). The study focused on low-melt fraction felsic migmatites in which peritectic garnet are strongly elongated and show plastic deformation. These peritectic garnet grains show different typology depending on their petrographic location within the layered migmatite. An elongated shaped garnet with sillimanite and biotite inclusion lies within Al-rich layer whereas poecilithic garnets are located within S-rich layers, forming a garnet-quartz aggregate. The study presents petrological, microstructural observation and EBSD analyses of the garnet grains and garnet-quartz aggregates. Phase diagram sections modeling allows to constrain the P-T conditions of the deformation at 850-1000 degrees C and 0.6-1.1 GPa. At such high-to ultra-high temperature conditions, a low melt fraction was produced, between 1 and 12% (generally under 7%). Forescattered diffraction and misorientation maps with Orientation Pole Figure argue for dislocation creep with development of subgrains in garnets. Our results suggest that at high-to ultra-high temperature, the quartz-feldspar-garnet solid framework of felsic migmatites strongly accommodate the deformation and contribute to weakening of migmatite even at low melt fraction.
WOS关键词P-T PATH ; MONGOLIA SUTURE ZONE ; PLASTIC-DEFORMATION ; SILICATE GARNETS ; PHASE-EQUILIBRIA ; CRYSTAL PLASTICITY ; PELITIC GRANULITES ; DAQINGSHAN COMPLEX ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST
资助项目National Key R&D Program of China[2016YFC0600401] ; National Key R&D Program of China[2016YFC0600102] ; NSFC[41502215] ; NSFC[41472193]
WOS研究方向Geology
语种英语
WOS记录号WOS:000512484400006
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC
源URL[http://ir.iggcas.ac.cn/handle/132A11/95673]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Lobjoie, Cyril
作者单位1.Chinese Acad Sci, Inst Earth Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Bourgogne Franche Comte, UMR Chronoenvironm 6249, F-25030 Besancon, France
3.Univ Montpellier, CNRS, UMR Geosci Montpellier 5243, F-34095 Montpellier 05, France
推荐引用方式
GB/T 7714		 Lobjoie, Cyril,Trap, Pierre,Oliot, Emilien,et al. Rheological behavior of high temperature garnet-bearing migmatites: The Khondalite Belt example (North China Craton)[J]. JOURNAL OF STRUCTURAL GEOLOGY,2020,131:17.
APA Lobjoie, Cyril.,Trap, Pierre.,Oliot, Emilien.,Lin, Wei.,Barou, Fabrice.,...&Marquer, Didier.(2020).Rheological behavior of high temperature garnet-bearing migmatites: The Khondalite Belt example (North China Craton).JOURNAL OF STRUCTURAL GEOLOGY,131,17.
MLA Lobjoie, Cyril,et al."Rheological behavior of high temperature garnet-bearing migmatites: The Khondalite Belt example (North China Craton)".JOURNAL OF STRUCTURAL GEOLOGY 131(2020):17.

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来源：地质与地球物理研究所

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