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

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 investigated 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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Deformation behavior and fluid action of quartz veins in the Xuelongshan metamorphic complex,Western Yunnan

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中国科学:地球科学英文版 2023年第9期66卷 2011-2033页

作者： Shuting WANG Shuyun CAO lefan zhan Xuemei CHENG Yanlong DONG Xiaowen LI Wenyuan LI State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China

The Xuelongshan metamorphic complex underwent Cenozoic sinistral strike-slip shearing and exhumation from deep to shallow in the southeast margin of the Tibet *** studied the deformation behavior and fluid action of quartz veins in the metamorphic complex in depth based on macroscopic observation,electron backscatter diffraction fabric,and fluid inclusion *** mylonitic samples are characterized by strongly elongated and orientated porphyroclasts and a finegrained matrix with a shear strain of *** ultramylonitic samples are characterized by a strongly fine-grained matrix with a shear strain of ***{m}glide controls the quartz deformation in the mylonites and *** the dominant recovery mechanism,subgrain rotation dynamic recrystallization reduces the grain size and promotes rheological *** porphyroclasts restrict the crystal orientation of the recrystallized quartz *** mylonitic quartz veins have abundant single-phase and two-phase fluid ***,the ultramylonitic quartz veins have a few fluid inclusions,most of which are small and irregular toward the grain *** temperature and pressure of fluid activity in quartz veins are 550–500℃and 391–218 MPa for ultramylonitic quartz veins,with a depth of 14.2–7.9 km and 450–400℃and 236–91 MPa for mylonitic quartz veins,with a depth of 8.6–3.3 *** deformation process changes the shape of fluid inclusions from mylonitization to ultramylonitization and causes fluid leakage,an increase in local fluid pressure at the boundary,and hydrolysis weakening,promoting lattice dislocation glide and recrystallization,which is directly related to regional continuous shear deformation and exhumation.

关键词： Deformed quartz veins EBSD fabric Fluid Rheological weakening Exhumation process

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