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Deformation structure and exhumation process of the Laojunshan gneiss dome in southeastern Yunnan of China

Science China Earth Sciences 2021年第12期64卷 2190-2216页

作者： Zhong LIU Shuyun CAO Yanlong DONG Wei LI Xuemei CHENG Haobo WANG Meixia LYU State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan430074China

Middle-lower crust and mantle rocks are generally widely exposed in metamorphic core complex or gneiss dome,which is an ideal place to study the exhumation process related to regional extension and *** Laojunshan metamorphic complex in southeastern Yunnan is located in a special tectonic position surrounded by the Cathaysia,Yangtze and Indochina *** is composed of different metamorphic-deformation rocks and granitic *** also are many economic deposits(e.g.,tin and tungsten)that are spatially and genetically associated with the formation and exhumation of the Laojunshan gneiss *** on detailed analysis of macro-and microscopic structure,stress field distribution and deformation condition,the tectonic units of the Laojunshan metamorphic complex show obvious characteristics of doming,as well as of typical structural units of metamorphic core *** has strongly deformed metamorphic gneiss core(footwall),detachment fault system and sedimentary cover(hanging wall)with lightly metamorphism and *** footwall of gneiss dome presents a strongly ductile deformation domain,accompanied by different ages of granitic *** distribution of developed foliation and lineation within granitic gneisses are arc-shaped and radial,respectively,with a nearly N-S trending from the footwall to the hanging *** of deformed rocks gradually weakens and transits to orthogneiss as it moves away from the detachment fault toward the *** low angle detachment fault between the footwall and the hanging wall shows an arc-like shape *** fabrics are preserved in the deformed rocks of the detachment fault,which are mainly composed of chloritized schist,fault breccia,cataclasite and fault gouge.A large number of normal faults are developed in detachment faults and hanging wall,and their stress fields radiate in an arc around the *** U-Pb ages of amphibolite and granitic gneiss from the footwall range

关键词： Gneiss dome Inversion of stress field ebsd texture Zircon U/Pb geochronology Caledonian movement in South China

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Strain Localized Deformation Variation of a Small-Scale Ductile Shear Zone

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Journal of Earth Science 2023年第2期34卷 409-430页

作者： Lefan Zhan Shuyun Cao Yanlong Dong Wenyuan Li State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China

A continental-scale strike-slip shear zone frequently presents a long-lasting deformation and physical expression of strain localization in a middle to lower crustal ***,the deformation evolution of strain localization at a small-scale remains *** study investigatedebsd results revealed that the small-scale shear zone experienced ductile deformation under medium-high temperature *** aggregates suggested a consistent temperature with an irregular feature,exhibiting a dominated high-temperature prism slip ***,coarse-grained aggregates in the mylonite of the shear zone were deformed predominantly by dislocation creep,while ultra-plastic flow by viscous grain boundary sliding was an essential deformation process in the extremely fine-grained(~50μm)mixed-phases in the ***-derived strain rates calculated from quartz paleopiezometry were on the order of 10^(-15) to 10^(-13) s^(-1)from low-strain mylonite to high strained *** localization and strain ratelimited process was fluid-assisted precipitation presenting transitions of compositions as hydrous retrogression of hornblende to mica during increasing deformation and ***,the potential occurrence of the small-scale shear zone was initiated at a middle-deep crust seated crustal condition dominated by the temperature-controlled formation and rheological weakening.

关键词： strain localization ductile deformation ultramylonite microstructure ebsd texture Gaoligong shear zone

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