| 南极无冰区典型沉积环境石英砂表面结构特征及其在沉积环境识别中的应用 |
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| 引用本文： | 尹雪斌,孙立广,刘晓东.南极无冰区典型沉积环境石英砂表面结构特征及其在沉积环境识别中的应用[J].极地研究,2003,14(1):1-11. |
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| 作者姓名： | 尹雪斌 孙立广 刘晓东 |
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| 作者单位： | 中国科学技术大学极地环境研究室,合肥,230026 |
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| 基金项目： | 国家自然科学基金资助项目 (批准号 :40 0 760 3 2 ) |
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| 摘 要： | 本文利用电镜扫描方法 (SEM)对比分析了南极乔治王岛无冰区海滩沉积、冰碛物以及阿德雷岛湖泊沉积等典型沉积环境中的石英砂表面结构特征 ,得出了乔治王岛各典型沉积环境中石英砂表面结构特征的颗粒频率曲线。结果表明 :不同沉积环境下的石英砂颗粒表面结构特征具有相似性 ,这主要和南极地区广泛发育的冰川作用有关 ,同时 ,它们也有各自典型的特征组合 ,这些典型特征组合的不同反映了石英砂后期的搬运历史和沉积环境的差异。本文还依据石英砂表面特征的颗粒出现频率 ,利用聚类分析方法对研究区内三级海岸阶地上的沉积物和一个未知成因的样品进行了沉积环境的判别分析 ,结果证明石英砂微形貌特征可以作为南极地区沉积环境识别的有效手段
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| 关 键 词： | 石英砂 表面结构 沉积环境 无冰区 南极 |
Measurements of sea ice thickness and its subice morphology analysis using ice-penetration radar in the Arctic Ocean |
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| Yin Xuebin,Sun Liguang and Liu Xiaodong.Measurements of sea ice thickness and its subice morphology analysis using ice-penetration radar in the Arctic Ocean[J].Chinese Journal of Polar Research,2003,14(1):1-11. |
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| Authors: | Yin Xuebin Sun Liguang and Liu Xiaodong |
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| Abstract: | Relative frequency distributions of the various surface textures recorded on quartz grains can indicate the depositional environment. Surface textural analysis of quartz grains under some representative sedimentary environments on the Fildes Peninsula were performed by Scanning Electron Microcopy (SEM). The results suggest that glacial transportation had occurred on the most of quartz grains from various depositional environments in ice free area of King George Island and this correspond well to extensive glacial debris. Furthermore, there are some differently characteristic textures present on quartz grain from various depositional environments in studying area. For example, V shaped pits show high enough frequencies on modern beach sands, suggesting high energy subaqueous transport, and the striations were produced largely on the tills. Based on the data for surface texture occurring frequency, we classify samples into different groups in order to identify their depositional environment. The results show that ancient beach sands were preserved in the second, the third, the fifth marine terraces, and F 1 sample is predominantly composed of tills. These judgments are supported by filed survey. Therefore, surface textural analysis of quartz grains can be used as effectively auxiliary criterion for identification of depositional environment in Antarctic ice free area. |
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| Keywords: | quartz grain surface texture depositional environment ice free area Antarctica |
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