| 南极无冰区古海蚀龛石英颗粒表面结构特征及其环境意义 |
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| 引用本文： | 刘晓东,孙立广,尹雪斌,赵俊琳.南极无冰区古海蚀龛石英颗粒表面结构特征及其环境意义[J].海洋地质与第四纪地质,2002,22(1):37-42. |
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| 作者姓名： | 刘晓东 孙立广 尹雪斌 赵俊琳 |
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| 作者单位： | 1. 中国科学技术大学,极地环境研究室,合肥,230026
2. 北京师范大学,环境科学研究所,北京,100875 |
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| 基金项目： | 国家自然科学基金资助项目 ( 4 0 0 76 0 32 )，中国科学院创新工程资助项目 ( KZCX-2 -30 3 |
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| 摘 要： | 石英砂表面结构特征组合能指示沉积物的搬运历史和沉积环境。利用电镜扫描方法分析了南极法尔兹半岛上海蚀成因的古海蚀龛沉积物中的石英砂表面结构特征组合。结果表明，在所有的石英砂表面上均表现出冰川和水流共同作用的结构特征组合，龛中沉积物是冰水沉积环境下的产物，在沉积过程中，沉积物先经过较薄的冰川搬运，后经历了不同能量的流水改造作用，但冰川和流水的搬运距离有限。上述研究结果表明，南极法尔兹半岛上的冰盖解体并退出长城站区的时间应早于4600aBP。
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| 关 键 词： | 古海蚀龛 石英砂 表面结构 沉积环境 南极 |
| 文章编号： | 0256-1492(2002)01-0037-06 |
| 修稿时间： | 2001年7月27日 |
CHARACTERISTICS OF SURFACE TEXTURES OF QUARTZ IN THE WAVE CUT NOTCH IN THE FILDES PENINSULA OF ANTARCTICA AND THEIR ENVIRONMENTAL SIGNIFICANCE |
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| LIU Xiao-dong ,SUN Li-guang ,YIN Xue-bin ,ZHAO Jun-lin.CHARACTERISTICS OF SURFACE TEXTURES OF QUARTZ IN THE WAVE CUT NOTCH IN THE FILDES PENINSULA OF ANTARCTICA AND THEIR ENVIRONMENTAL SIGNIFICANCE[J].Marine Geology & Quaternary Geology,2002,22(1):37-42. |
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| Authors: | LIU Xiao-dong SUN Li-guang YIN Xue-bin ZHAO Jun-lin |
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| Institution: | LIU Xiao-dong 1,SUN Li-guang 1,YIN Xue-bin 1,ZHAO Jun-lin 2 |
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| Abstract: | Relative frequency distributions of various surface texures recorded in quartz grains can indicate the transportational history and depositional environment.In this paper,surface texture analysis of quartz grains from a wave-cut notch in the Fildes Peninsula was performed by Scanning Electron Microscopy(SEM)to identify different types of textures and to give their transportational and depositional environment.Relative frequency distributions of the various surface textures recorded in quartz grains indicate that sediments deposited in the goe had the same or similar transportational history and depositional environment.From improved environmental grain percentage method,it is shown that those microtextures from glacial and fluvial environment have a considerable overlap in the types of surface textures,as might be expected in this system where sediment had been transported by glacier.A detailed investigation of quartz surface texture suggests that the thickness of ice transporting the goe sediments was thin,and the distance of transport by glacier is very finite.All the above information indicates that all the sediments in the goe was generated in a glaciofluvial depositional environment.Based on the transportational history and sedimentary environment of the goe sediments,it is known that the age of the glacier retreating process in the Fildes Peninsula was earlier than 4 600 aBP. |
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| Keywords: | wave-cut notch quartz grain surface texture sedimentary environment |
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