[1]刘 超,陈 剑*,崔之久,等.雪隆囊地区堰塞湖溃坝沉积物的石英砂表面微观特征[J].山地学报,2017,(03):357-368.[doi:10.16089/j.cnki.1008-2786.000232]
 LIU Chao,CHEN Jian,CUI Zhijiu,et al.SEM Surface Microstructure of Quartz Grains Collected from Dam Break Sediments at Xuelongnang of Jinsha River[J].Mountain Research,2017,(03):357-368.[doi:10.16089/j.cnki.1008-2786.000232]
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雪隆囊地区堰塞湖溃坝沉积物的石英砂表面微观特征()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2017年03期
页码:
357-368
栏目:
山地灾害
出版日期:
2017-05-30

文章信息/Info

Title:
SEM Surface Microstructure of Quartz Grains Collected from Dam Break Sediments at Xuelongnang of Jinsha River
文章编号:
1008-2786-(2017)3-357-12
作者:
刘 超1陈 剑1*崔之久2黎 艳1陈 松1
1.中国地质大学(北京)工程技术学院,北京 100083;
2.北京大学 城市与环境学院,北京 100871
Author(s):
LIU Chao1 CHEN Jian1 CUI Zhijiu2 LI Yan1 CHEN Song1
1.School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;
2.School of Urban and Environmental Sciences, Peking University, Beijing 100871, China
关键词:
雪隆囊 堰塞湖 溃坝沉积物 石英砂 扫描电镜 微观结构
Keywords:
Xuelongnang dam break sediment landslide-dammed lake quartz grains SEM microstructure
分类号:
P642.2
DOI:
10.16089/j.cnki.1008-2786.000232
文献标志码:
A
摘要:
石英砂表面微结构分析有助于理解沉积物的成因环境。四川省雪隆囊地区位于青藏高原东南缘金沙江上游,该处分布有堰塞湖溃坝沉积物。为了判断其溃坝沉积物的沉积成因和形成环境以及过程,采集石英砂样品并进行扫描电镜分析,初步获得堰塞湖溃坝沉积物石英砂的表面微观结构组合特征是次棱角状及次圆状颗粒为主,颗粒边缘形状为棱脊磨损及次棱脊,表面多为中、低起伏; 少量出现贝壳状断口,小撞击坑出现较多,平行解理面少见甚至没有; 擦痕、磨光面少量出现; 化学溶蚀和沉淀形态包括蚀坑和蚀缝、硅质薄膜和硅质球。结果表明雪隆囊堰塞湖溃坝沉积物在沉积过程中不仅受到强烈的机械撞击作用,而且在后期也有比较强烈的水流作用参与其中,可以为分析溃坝沉积物的沉积过程和沉积环境提供参考。雪隆囊溃坝沉积物石英砂表面微观结构特征与残坡积、冰碛、冰水、冲积、洪积、泥石流、湖相沉积、海洋沉积、风成等沉积环境明显不同。
Abstract:
In the study area, the dam break sediments of a landslide-dam were distributed in the Upper Jinsha River in southwest China.Systematical research was carried out regarding quartz grain microstructure characteristics by Scanning Electron Microscopy(SEM), using the Xuelongnang dam break sediment in Upper Jinsha River as the research object.The large amount of statistical data showed that the main microstructure assemblages of the quartz grains in the dam break sediment were common in the medium relief, small pits, sub angular, secondary ridges(50% to 75%); sparse in the sub rounded, ridge wear, low relief, conchoidal fractures, parallel cleavage planes, striation(5%-50%); and rare in the polished surface(< 5%).Meanwhile, chemical dissolution/precipitation patterns were solution pits and crevasses, silica pellicle and globules.The results showed that the dam break sediment was modified not only by mechanical impact, but also by strong water flow afterwards.These findings could potentially be used as a microscopic discriminant mark to distinguish dam break sediment from those which are actually residual deposits, moraine, aqueoglacial deposits, alluvial deposits, diluvial deposits, debris flow deposits, lacustrine sediments, marine sediments, aeolian sediments, and so on.

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备注/Memo

备注/Memo:
收稿日期(Received date):2016-07-04; 改回日期(Accepted date):2016-11-28。
基金项目(Foundation item): 国家自然科学基金重点项目(41230743); 国家自然科学基金面上项目(41571012)。 [Key Program of National Natural Science Foundation of China(41230743); General Program of National Natural Science Foundation of China(41571012).]
作者简介(Biography):刘超(1991-),男,河南濮阳人,硕士研究生,主要研究方向:工程地质、地质灾害与环境。 [Liu Chao(1991-), male, born in Puyang,Henan province,M.Sc.candidate,research on engineering geology,geological hazards and environment.] E-mail: hnpylc 4876170@126.com
*通讯作者(Corresponding author):陈剑(1975-),男,博士,副教授,主要研究方向:工程地质、地质灾害与环境。 [Chen Jian(1975-), male, Ph.D., associate professor, research on engineering geology, geological hazards and environment.] E-mail: jianchen@cugb.edu.cn
更新日期/Last Update: 2017-05-30