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多相糜棱岩内第二相对应变局部化的影响 ——以秦岭群花岗质糜棱岩为例
投稿时间:2020-09-24  修订日期:2020-12-08  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021112
摘要点击次数: 89
全文下载次数: 110
作者单位地址
韩宁 中国地质大学(北京) 北京市海淀区学院路29号中国地质大学(北京)
赵中宝 中国地质科学院地质研究所 北京西城区阜外百万庄大街26号
王根厚 中国地质大学(北京) 
孙丽静 中国地质科学院地质研究所 
巴合达尔·巴勒塔别克 中国地质大学(北京) 
基金项目:南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(编号 GML2019ZD0201)
中文摘要:糜棱岩韧性变形发生的应变局部化过程,尤其是多相糜棱岩第二相对基质相变形的影响一直是显微构造研究难点。研究表明糜棱岩借助颗粒边界滑移实现多相混合,形成多矿物相集合体。在多相糜棱岩内,第二相在基质相颗粒边界施加齐纳阻力,牵制基质相颗粒边界的迁移速率,破坏基质相颗粒的动态平衡过程,使基质相颗粒位于古应力计对应的颗粒粒度以下,导致基质相整体的表面积增大,促进扩散交换过程,提高了扩散蠕变,降低了基质相位错蠕变和CPO形成的效率,使变形机制从颗粒粒径不敏感蠕变机制(GSI)过渡为颗粒粒径敏感蠕变机制(GSS)。另外,多相糜棱岩内的第二相具有诱导应变局部化的效应,使塑性应变局部化更为强烈,引起物质强度的变化,进而引起岩石变形过程和岩石圈流变行为的改变。选取秦岭群花岗质糜棱岩进行多相矿物糜棱岩定量化研究,结果显示花岗质糜棱岩伴随着云母含量的增多以及各相混合程度的增大,石英的颗粒粒度明显减小,CPO强度显著降低,基质相显微变形受第二相控制逐渐增强。
中文关键词:多相糜棱岩  第二相  应变局部化  显微变形机制  秦岭群
 
Effect of the second phase on the strain localization in multiphase mylonite: case study on the felsic mylonite in the Qinling Group
Author NameAffiliationAddress
Han Ning China University of Geosciences, Beijing 北京市海淀区学院路29号中国地质大学(北京)
Zhao zhongbao Institute of Geology, Chinese Academy of Geological Sciences, Beijing 北京西城区阜外百万庄大街26号
Wang Genhou China University of Geosciences, Beijing 
Sun Lijing Institute of Geology, Chinese Academy of Geological Sciences, Beijing 
Bahedaer Baletabieke China University of Geosciences, Beijing 
Abstract:The strain localization process and accompanied microstructures during ductile deformation, especially influence of the second phase on main phase mineral microstructure evolution in multiphase mylonite, has always been a difficulty in microstructural geology research. Previous studies have shown that grain boundary sliding is a potential mechanism to achieve multiphase mineral mixing and form multiphase aggregation in mylonite. Actually, natural mylonite is normally composed by multiphase minerals. Generally, in the multiphase mylonite, the second phase exerts a zener resistance at the boundary of the matrix phase grains, which restrains the migration rate of the grain boundaries in the matrix phase. This can destroy the dynamic equilibrium process of the matrix phase grains, and leading to the matrix phase grains below the grain size corresponding to the paleopiezometer. Furthermore, after the matrix phase grain size decreases, the overall surface area of the matrix phase increases that will contribute to the diffusion exchange process. In addition, due to the contribution of diffusion creep and the less efficiency of dislocation creep, the deformation mechanism is intending to change from grain size insensitive creep mechanism (GSI) to grain size sensitive creep mechanism (GSS). Moreover, the second phase in the multiphase mylonite has the effect on strain localization initiation, which probably changes the material strength, the rock deformation process and as well as rheological behavior. In this paper, based on the summary of previous research results, granitic mylonite from the Qinling Group is selected for the quantitative study. The preliminary results show that grain size of quartz and its strength of CPO is significantly reduced where increased mica content and the degree of mixing of the mineral phases within the granitic mylonite. Thus, we concluded that the microstructure of the matrix phase is gradually controlled by the second phase during mylonitic deformation in the natural mylonite.
keywords:Effect of the second phase on the strain localization in multiphase mylonite: a case study on the felsic mylonite in the Qinling Group
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