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冰川冻土 ›› 2016, Vol. 38 ›› Issue (2): 453-462.doi: 10.7522/j.issn.1000-0240.2016.0051

• 寒区科学与技术 • 上一篇    下一篇

云南大理点苍山末次冰期冰碛物石英砂扫描电镜形态特征分析

陈安东1, 顾佳妮2 3, 赵志中2, 钱方2, 王海雷1   

  1. 1. 中国地质科学院 矿产资源研究所 国土资源部盐湖资源与环境重点实验室, 北京 100037;
    2. 中国地质科学院 地质力学研究所, 北京 100081;
    3. 中国地质大学(北京), 北京 100083
  • 收稿日期:2015-12-02 修回日期:2015-12-02 出版日期:2016-04-25 发布日期:2016-07-13
  • 作者简介:陈安东(1987-),男,山东日照人,2015年在中国地质大学(北京)获博士学位,现为中国地质科学院在站博士后,主要从事第四纪地质与环境学研究.E-mail:anton.chen@163.com
  • 基金资助:
    国土资源公益性行业科研专项(201311140)资助

Quartz grains SEM surface microtextures of Quaternary glacial sediments along the Diancang Mountain in Yunnan, Southwest China

CHEN Andong1, GU Jiani2 3, ZHAO Zhizhong2, QIAN Fang2, WANG Hailei1   

  1. 1. MLR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
    2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    3. China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2015-12-02 Revised:2015-12-02 Online:2016-04-25 Published:2016-07-13

摘要: 云南大理点苍山是大理冰期的命名地,保存有确切的末次冰期冰川作用遗迹.对点苍山冰碛物石英砂进行了扫描电镜形态特征分析,获得了其石英砂形态特征及其频率,并在冰川成因的典型特征的频率上取得了新的认识.扫描电镜分析表明,点苍山冰碛物石英砂形态特征主要为:石英砂形状主要为次棱角状、尖棱角状和多棱角状,边缘多可见次棱脊和棱脊磨损,表面起伏度高;机械特征主要有贝壳状断口、平行解理面、裂隙、粘附碎片、擦痕、机械V形坑;化学特征主要有蚀坑和蚀缝、蜂窝状溶蚀表面、无定形硅沉淀和硅质薄膜.在石英砂表面与冰川作用密切相关的擦痕的频率为8%~32%;粘附碎片的频率为16%~40%;裂隙的频率为12%~32%.通过对点苍山冰碛物的石英砂扫描电镜分析,得出该第四纪海洋性冰斗冰川和悬冰川的石英砂形态特征及其频率.该冰碛物石英砂原始形态特征明显,机械特征频率不高,是近源堆积的冰碛物石英砂的典型形态特征.

关键词: 大理点苍山, 第四纪冰川, 冰碛物特征, 扫描电镜, 石英砂形态特征

Abstract: Diancang Mountain is the place where the concept of Dali Glaciation was put forward, and it is synonymous with the Last Glaciation in China. In this study, we applied Scanning Electron Microscopy(SEM)to the samples of Quaternary glacial sediments from the Diancang Mountain. According to the SEM analysis, the main surface microtextures of quartz grains from the Quaternary glacial sediments in Diancang Mountain are as follows:the quartz grains are mainly subangular and sharp angular outline, subedge ridge, high relief in shape; mechanical characters are mainly conchoidal fractures, parallel cleavages, crevasses, adhering particles, striations, V-shaped percussion cracks;chemical features are dissolution pits and grooves, honeycombed solution surface, SiO2 precipitates and silicon film. The features most related to glacial genesis are striations, with its frequency of 8%-32%;adhering particles, with its frequency of 16%-40%;cracks with its frequency of 12%-32%. According to the SEM of glacial sediments of Diancang Mountain, we obtained the microtextures and its frequency of maritime cirque glacier and hanging glacier. The quartz grains of the glacial sediments are characterized by original features, and glacial mechanical microtextures are not well developed.

Key words: Diancang Mountain, Quaternary glacier, glacial sediments, scanning electron microscopy, surface microtextures

中图分类号: 

  • P534.63