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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 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

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

基于Isight的某SUV白车身轻量化设计

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汽车实用技术 2024年第7期49卷 54-58页

作者：卞翔李占营董彦龙高文亮江苏科技大学机电与动力工程学院江苏苏州215600 张家港长城汽车研发有限公司江苏苏州215600

车身轻量化设计对汽车的节能减排有重要意义,为了对处于开发后期的某运动型多用途车(SUV)车型进行减重优化,应用代理模型技术搭建白车身优化流程。首先建立SUV白车身有限元模型,对扭转刚度性能进行仿真分析并作为优化设计的约束条件,通... 详细信息

车身轻量化设计对汽车的节能减排有重要意义,为了对处于开发后期的某运动型多用途车(SUV)车型进行减重优化,应用代理模型技术搭建白车身优化流程。首先建立SUV白车身有限元模型,对扭转刚度性能进行仿真分析并作为优化设计的约束条件,通过两次灵敏度分析,筛选出66个关键部件,38个设计变量,基于Isight优化平台,进行试验设计并构建了代理模型,以车身质量为目标,采用HYBRID算法对关键部件的厚度进行尺寸优化设计。优化后的白车身扭转刚度基本保持不变,车身质量得到降低。此优化流程在车型开发后期的白车身减重方面具有良好效果。

关键词：白车身轻量化有限元分析代理模型尺寸优化

Macro-superlubricity in sputtered MoS_(2)-based films by decreasing edge pinning effect

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Friction 2024年第1期12卷 52-63页

作者： Chunmeng dong dong JIANG yanlong FU Desheng WANG Qinqin WANG Lijun WENG Ming HU Xiaoming GAO Jiayi SUN State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

To date,MoS_(2) can only be achieved at *** pinning effect caused by structure defects is the most obvious barrier to expand the size of structural superlubricity to ***,we plan to pin edge planes of MoS_(2) with nanospheres,and then the incommensurate structure can be formed between adjacent rolling nanoparticles to reduce *** sputtered MoS_(2) film was prepared by the physical vapor deposition(PVD)in *** enough Cu_(2)O nanospheres(~40 nm)were generated in situ at the edge plane of MoS_(2) layers by liquid phase *** incommensurate structure(mismatch angle(θ)=8°)caused by MoS_(2) layers was formed before *** friction coefficient of the films(5 N,1,000 r/min)was~6.0×10^(−3) at the *** friction,MoS_(2) layers pinned on numerous of Cu_(2)O nanoparticles reduced its edge pinning effect and decreased ***,much more incommensurate was formed,developing macro-superlubricity.

关键词： sputtered MoS_(2)film Cu_(2)O nanospheres edge pinning effect macro-superlubricity

Deformation Characteristics of Hydrate-Bearing Sediments

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Journal of Ocean University of China 2024年第1期23卷 149-156页

作者： dong Lin LI yanlong ZHANG Yajuan HU Gaowei LIAO Hualin CHEN Qiang WU Nengyou Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266237China Laboratory for Marine Mineral Resources Laoshan LaboratoryQingdao 266237China College of Oceanography Hohai UniversityNanjing 210098China College of Petroleum Engineering China University of Petroleum(East China)Qingdao 266555China

The safe and efficient development of natural gas hydrate requires a deep understanding of the deformation behaviors of *** this study,a series of triaxial shearing tests are carried out to investigate the deformation properties of hydrate-bearing *** of volumetric and lateral strains versus hydrate saturation are analyzed *** indicate that the sediments with high hydrate saturation show dilative behaviors,which lead to strain-softening characteristics during *** volumetric strain curves have a tendency to transform gradually from dilatation to compression with the increase in effective confining *** easy prediction model is proposed to describe the relationship between volumetric and axial *** model coefficientβis the key dominating factor for the shape of volumetric strain curves and can be determined by the hydrate saturation and stress ***,a modified model is established for the calculation of lateral *** corresponding determination method is provided for the easy estimation of model coefficients for medium sand sediments containing *** study provides a theoretical and experimental reference for deformation estimation in natural gas hydrate development.

关键词： gas hydrate deformation characteristics volumetric strain lateral strain prediction model

Grain-size reduction of feldspar and flow of deformed granites within the Gaoligong shear zone, southwestern Yunnan, China

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Science China Earth Sciences 2019年第9期62卷 1379-1398页

作者： yanlong dong Shuyun CAO Xuemei CHENG Junlai LIU Hanchen CAO State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences Wuhan 430074 China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China

Mineral deformation and rock flow mechanism in the lithosphere are related to the rheological behavior and weakening mechanism of the continent. Natural deformation behaviors of feldspars are not well understood due to the complexity of their mineral compositions, crystal structures, as well as changing deformation conditions. The refined microstructure,fabric and composition of major minerals in the deformed granitic rocks within the Gaoligong shear zone(GLGSZ), southwestern Yunnan, China, were studied. With increasing mylonitization, two fabric types of end-members have been distinguished(type-I banded granitic mylonite and type-II banded ultramylonite). The two types of deformed granitic rocks have the same mineral assemblage, but different mineral modes. The type-I banded granitic mylonite has a greater proportion of K-feldspar(mostly present as porphyroclasts)>plagioclase>quartz±biotite, however, the type-II banded ultramylonite has a greater proportion of fine-grained plagioclase>K-feldspar>quartz±biotite. The crystallographic preferred orientation(CPO) patterns of quartz combined with two-feldspar geothermometer, confirm that the quartz grains in the type-I and type-II granitic rock have undergone high-temperature dislocation creep deformation. The K-feldspar grains in the matrix of type-II banded ultramylonite show a dominant(100)[010] slip system with dislocation creep recrystallization, while the fine-grained plagioclase grains present a weak CPO pattern with superplastic flow. The K-feldspar porphyroclasts show grain-size reduction associated with mineral composition and fabric transformation. The myrmekite formation with the fine-grained neocrystallization of plagioclase and quartz significally replaced the K-feldspar porphyroclasts. Finally, the fine-grained neocrystallization plagioclases were formed further into the high strain localized ultramylonites with superplastic flow.

关键词： Feldspar Grain-size reduction EBSD fabric Fluid Myrmekite Mylonite Ultramylonite

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

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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

Effect of SiO_(2) Aerogel-cement Mortar Coating on Strength of Self-Compacting Concrete after Simulated Tunnel Fire

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Journal of Wuhan University of Technology(Materials Science) 2021年第5期36卷 672-681页

作者：王新杰 JIA Zhi 朱平华 LIU Hui CHEN Chunhong dong yanlong Department of Civil Engineering Changzhou UniversityChangzhou 213164China Railway 19th Bureau Group Sixth Engineering Co.Ltd Wuxi 214000Chinaa

In order to facilitate self-compacting concrete to be better used in tunnel linings that can resist fires,a SiO_(2) aerogel-cement mortar coating was *** on the HC curve,a self compacting concrete cube specimens coated and uncoated with SiO_(2) aerogel-cement mortar(SiO_(2)-ACM)were heated to simulate tunnel fire for 0.5,1,1.5,2,2.5,3 and 4 h,*** residual compressive strength was tested after the specimens were cooled to room temperature by natural cooling and water *** results show that,the damages of specimens become more serious as fire time goes on,but the residual strength of specimens coated with SiO_(2)-ACM is always higher than that of uncoated with SiO_(2)-*** addition,the residual strength of specimens cooled by water cooling is lower than that of natural ***,for the specimens coated with SiO_(2)-ACM,the adverse effects of water cooling are *** the increase of fire time,the protective effect of SiO_(2)-ACM is still gradually ***,a formula was established to predict the residual 150 mm cube compressive strength of specimens protected by SiO_(2)-ACM after a simulated tunnel fire.

关键词： self-compacting concrete SiO_(2)aerogel-cement mortar simulated tunnel fire residual compressive strength natural cooling water cooling

Metamorphic, deformation, fluids and geological significance of low-temperature retrograde mylonites of Diancangshan metamorphic massif along Ailaoshan-Red River strike-slip fault zone, Yunnan, China

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Science China Earth Sciences 2018年第8期61卷 1023-1041页

作者： Xuemei CHENG Shuyun CAO Junyu LI Zunpu YU yanlong dong Meixia LV Junlai LIU State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and Resources China University of Geosciences

Diancangshan metamorphic massif is one of the four metamorphic massifs developed along the Ailaoshan-Red River strike-slip fault zone, Yunnan, China. It has experienced multi-stage metamorphism and deformation, especially since the late Oligocene it widely suffered high-temperature ductile shear deformation and exhumation of the metamorphic rocks from the deep crust to the shallow surface. Based on the previous research and geological field work, this paper presents a detailed study on deformation and metamorphism, and exhumation of deep metamorphic rocks within the Diancangshan metamorphic massif,especially focusing on the low-temperature overprinted retrogression metamorphism and deformation of mylonitic rocks. With the combinated experimental techniques of optical microscope, electron backscatter diffraction attachmented on field-emission scanning electron microscopy and cathodoluminescence, our contribution reports the microstructure, lattice preferred orientations of the deformed minerals, and the changes of mineral composition phases of the superposition low-temperature retrograde mylonites. All these results indicate that:(1) Diancangshan deep metamorphic rock has experienced early high-temperature leftlateral shear deformation and late extension with rapid exhumation, the low-temperature retrogression metamorphism and deformation overprinted the high-temperature metamorphism, and the high-temperature microstructure and texture are in part or entirely altered by subsequent low-temperature shearing;(2) the superposition of low-temperature deformation-metamorphism occurs at the ductile-brittle transition; and(3) the fluid is quite active during the syn-tectonic shearing overprinted lowtemperature deformation and metamorphism. The dynamic recrystallization and/or fractures to micro-fractures result in the strongly fine-grained of the main minerals, and present strain localization in micro-domians, such as micro-shear zones in the mylonites. It is often accompani

关键词：变形岩石低温度糜棱岩地质液体云南中国扫描电子显微镜