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滇西哀牢山变质杂岩中含石墨岩石的变形-变质温度与构造特征
投稿时间:2018-12-24  修订日期:2019-02-27  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2019138
摘要点击次数: 168
全文下载次数: 135
作者单位E-mail
吕美霞 中国地质大学(武汉) 694204273@qq.com 
曹淑云 中国地质大学(武汉) shuyun.cao@cug.edu.cn 
中文摘要:该文章在前人研究成果及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变质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 Spectrum)技术方法和手段,对含石墨岩石及矿物的变形宏观及显微构造、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。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含石墨岩石变形-变质峰值温度为530-460oC。基质中强烈细粒化的石墨石英、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。
中文关键词:哀牢山-红河剪切带、变形显微构造、石墨拉曼光谱地质温度计、晶格优选定向、流变弱化
 
Deformation-metamorphic temperature and characteristics of graphite-bearing rocks within Ailaoshan metamorphic complex
Author NameAffiliationE-mail
LV Mexia China University of Geoscience (Wuhan) 694204273@qq.com 
Cao Shuyun China University of Geoscience (Wuhan) shuyun.cao@cug.edu.cn 
Abstract:On the basis of previous research results and detailed field geological observations, the graphite-bearing rocks in the southeastern part of the Ailaoshan complex in the Cenozoic Ailaoshan-Red River (ASRR) strike-slip fault zone are studied in this paper. The technical methods of optical microscope (OM), scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and Raman spectrum are mainly used to comprehensively analyze the deformation macro- and micro-structure of graphite-bearing rocks and minerals, the graphite Raman temperature, the mineral lattice preferred orientation (LPO) and its deformation-metamorphic environment. Graphite Raman spectrum geothermometer shows that the Raman peak temperature of graphite-bearing rocks in the study area is 530-460℃. Graphite and matrix quartz and plagioclase have obvious similar lattice preferred orientation, and graphite and quartz show strong slip system in the direction of (0001) . The development of fine-grained graphite slip system and feldspar and quartz play an important role in rheological weakening of the grain plastic deformation of the whole rock.
keywords:Ailaoshan-Red River shear zone, Deformation microstructure, Graphite Raman spectrum geothermometer, Lattice preferred orientation (LPO), Rheological weakening
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