检索结果-南通市图书馆

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

Science China Earth Sciences 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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： Low-temperature mylonites Brittle-ductile transition Microstructure Fluid Exhumation Rheological weakening

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Single-scan polarization-resolved degenerate four-wave mixing spectroscopy using a vector optical field

引用

Photonics Research 2022年第1期10卷 230-236页

作者： JIAQI YUAN xuemei cheng XING WANG TENGFEI JIAO ZHAOYU REN State Key Laboratory of Photon-Technology in Western China Energy International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics&Photon-TechnologyNorthwest UniversityXi’an 710069China State Key Laboratory of Transient Optics and Photonics Chinese Academy of SciencesXi’an 710119China

We report on a new method to achieve the single-scan polarization-resolved degenerate four-wave mixing(DFWM)spectroscopy in a Rb atomic medium using a vector optical field,in which two pump beams are kept linearly polarized and a vector beam is employed as the probe *** the polarization and intensity of the DFWM signal are closely dependent on the polarization state of the probe beam,a vector probe beam with space-variant states of polarization is able to generate a DFWM signal with space-variant states of polarization and intensity across the DFWM ***,the polarization-resolved spectra can be retrieved from a single DFWM *** the best of our knowledge,this is the first time that the single-scan polarizationresolved spectrum detection has been realized experimentally with a vector *** work provides a simple but efficient single-scan polarization-resolved spectroscopic method,which would be of great utility for the samples of poor light stability and fast optical processes.

关键词： resolved mixing degenerate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Stimulated Brillouin scattering induced all-optical modulation in graphene microfiber

引用

Photonics Research 2019年第1期7卷 8-13页

作者： JIWEN ZHU xuemei cheng YALI LIU RUIDUO WANG MAN JIANG DIAO LI BAOLE LU ZHAOYU REN State Key Lab Incubation Base of Photoelectric Technology and Functional Materials National Photoelectric Technology and Functional Materials& Application International Cooperation Center Institute of Photonics & Photon-Technology Northwest University

Graphene microfibers are burgeoning modulators with great potential in all-optical communication. One of the critical issues that remains to be understood is the dynamic mechanism of light–graphene interaction. Here, we propose a power dependent modulation by using 980 nm pump light and 1064 nm signal light via graphene microfiber, and the results show a strong transmission reduction and frequency blue shift with the increase of pump power. The experimental observation is attributed to a stimulated Brillouin scattering process induced by the pump light. Power and frequency variations are a result of energy transition of the scattered phonon in the fiber. This work reveals the nonlinear effect process in the light–graphene interaction and provides a new method for power and frequency control with graphene all-optical modulation.

关键词： Graphene microfibers burgeoning modulators great potential

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhancement of phase conjugation degenerate four-wave mixing using a Bessel beam

引用

Photonics Research 2018年第3期6卷 162-167页

作者： QIAN ZHANG xuemei cheng HAOWEI CHEN Bo HE ZHAOYU REN YING ZHANG JINTAO BAI State Key Laboratory Incubation Base of Photoelectric Technology and Functional Materials National Photoelectric Technology and Functional Materials and Application of Science and Technology International Cooperation CenterInstitute of Photonics&Photon-TechnologyNorthwest UniversityXi'an 710069China School of Science Engineering University of PAPXi'an 710086China

We report on the enhancement of phase conjugation degenerate four-wave mixing(DFWM) in hot atomic Rb vapor by using a Bessel beam as the probe beam. The Bessel beam was generated using cross-phase modulation based on the thermal nonlinear optical effect. Our results demonstrated that the DFWM signal generated by the Bessel beam is about twice as large as that generated by the Gaussian beam, which can be attributed to the extended depth and tight focusing features of the Bessel beam. We also found that a DFWM signal with reasonable intensity can be detected even when the Bessel beam encounters an obstruction on its way, thanks to the selfhealing property of the Bessel beam. This work not only indicates that DFWM using a Bessel beam would be of great potential in the fields of high-fidelity communication, adaptive optics, and so on, but also suggests that a Bessel beam would be of significance to enhance the nonlinear process, especially in thick and scattering media.

关键词： Enhancement of phase conjugation degenerate four-wave mixing using a Bessel beam

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

企业信息化过程中知识转移机理分析

引用

情报杂志 2005年第5期24卷 36-37页

作者：程雪梅广东揭阳职业技术学院揭阳522000

在分析知识转移一般过程的基础上,研究了企业信息化过程中的六种知识转移类型,探讨了知识转移过程中价值的实现方式。

关键词：信息化过程知识转移机理分析企业一般过程

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高空高速无尾布局无人机全包线鲁棒控制设计研究

引用

弹箭与制导学报 2011年第1期31卷 23-25,32页

作者：程雪梅西北工业大学西安710072

高空高速无尾布局无人机全包线鲁棒控制因其宽泛的飞行包线和特殊的布局成为飞行控制设计的技术难点。文中把鲁棒控制设计分解为无尾飞机的鲁棒稳定和高空高速无人机宽包线飞行的鲁棒控制两步,阐述了适合于无尾飞机的鲁棒稳定结构,给出... 详细信息

高空高速无尾布局无人机全包线鲁棒控制因其宽泛的飞行包线和特殊的布局成为飞行控制设计的技术难点。文中把鲁棒控制设计分解为无尾飞机的鲁棒稳定和高空高速无人机宽包线飞行的鲁棒控制两步,阐述了适合于无尾飞机的鲁棒稳定结构,给出了全包线鲁棒控制设计方法,仿真分析显示较好的解决了无尾飞机从低空低速到高空高速的鲁棒控制。

关键词：高空高速无尾布局全包线鲁棒控制

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

滇西哀牢山变质杂岩中含石墨岩石的变形-变质温度、构造特征及流变弱化意义

引用

地质学报 2020年第2期94卷 491-510页

作者：吕美霞曹淑云李俊瑜程雪梅中国地质大学(武汉)地质过程与矿产资源国家重点实验室地球科学学院武汉430074

前人研究表明石墨化作用与变质温度具有良好的相关性,同时室内摩擦实验研究认为少量石墨就能够有效地降低断层摩擦阻力,进而被认为对断层弱化起着重要的固体润滑作用而开始受到大家的关注。但是由于技术手段的限制,我们对天然断裂带中... 详细信息

前人研究表明石墨化作用与变质温度具有良好的相关性,同时室内摩擦实验研究认为少量石墨就能够有效地降低断层摩擦阻力,进而被认为对断层弱化起着重要的固体润滑作用而开始受到大家的关注。但是由于技术手段的限制,我们对天然断裂带中含石墨岩石的宏观-微观构造、变形机制、变形-变质环境以及对岩石流变行为的贡献仍然还不是很清楚。本文在详细的野外地质观测的基础上结合室内实验分析,对新生代红河-哀牢山走滑断裂带内哀牢山深变质杂岩东南侧边界发育的含石墨岩石开展了深入的研究。其中主要侧重利用光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)以及拉曼光谱(Raman Spectra)技术方法和手段,对宏观及显微构造变形行为、石墨拉曼温度、矿物晶格优选定向(LPO)以及其变形-变质环境进行了综合分析。结果表明,含石墨岩石显微构造特征表现为典型的塑性到超塑性流动构造特征,通过石墨拉曼光谱地质温度计,获得了哀牢山杂岩东部边界与上盘未变质岩石接触的含石墨岩石变形-变质的石墨拉曼温度为462~505℃;而靠近深变质岩含石墨岩石的石墨拉曼温度在511~529℃。基质中强烈细粒化的石墨、石英及长石具有明显的晶格优选定向,其中石墨和石英均表现出强烈的(0001)方向上的滑移系。细粒化的石墨滑移系的发育与长石、石英共同对岩石整体的晶质塑性变形起着重要的流变弱化作用。

关键词：哀牢山-红河剪切带变形显微构造变形石墨石墨拉曼光谱地质温度计晶格优选定向流变弱化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：