| 青藏高原东缘第四纪泥石流沉积物地球化学分析 |
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| 引用本文： | 魏东岚,李永化.青藏高原东缘第四纪泥石流沉积物地球化学分析[J].水土保持研究,2012,19(6):292-298. |
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| 作者姓名： | 魏东岚 李永化 |
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| 作者单位： | 辽宁师范大学 城市与环境学院, 辽宁 大连 116029 |
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| 基金项目： | 国家重点基础研究发展规划“青藏高原形成演化及其环境、资源效应” |
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| 摘 要： | 以甘肃武都地区、云南小江流域发育的泥石流体为研究对象,采用地球化学元素分析方法,分析不同地区,不同时代泥石流体中化学元素的分布、分配、迁移和富集的规律,并对泥石流沉积物中的硅铝系数(SiO2/Al2O3)、CaCO3含量、pH值、有机质含量所反映的气候变化特点进行了探讨.结果表明:第四纪泥石流的地球化学特征有别于其它类型的第四纪沉积物;青藏高原东缘第四纪泥石流体中SiO2、CaCO3、有机质含量表现为时代越老含量越高,而Al2O3、K2O含量则表现为时代越老含量越低;硅铝系数表现为时代越老越高,显示了第四纪时期该地区气候波动的总体趋势是干燥程度逐渐增加.研究结果对分析青藏高原的阶段性隆升具有一定的借鉴意义.
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| 关 键 词： | 青藏高原 第四纪 泥石流沉积物 地球化学 |
The Geochemistry Analysis of the Debris Flow Sediment in the Quaternary at the Eastern Fringe of Qinghai-Tibetan Plateau |
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| WEI Dong-lan,LI Yong-hua.The Geochemistry Analysis of the Debris Flow Sediment in the Quaternary at the Eastern Fringe of Qinghai-Tibetan Plateau[J].Research of Soil and Water Conservation,2012,19(6):292-298. |
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| Authors: | WEI Dong-lan LI Yong-hua |
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| Institution: | College of Urban and Environment Science, Liaoning Normal University, Dalian, Liaoning 116029, China |
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| Abstract: | The debris flow of the Wudu region in Gansu and Xiaojiang River Basin in Yunnan was taken as study Sites. By geochemical analysis, the chemical elements distribution, allocation and migration of chemical elements in debris flow in different times at different areas were investigated. Then the characteristics of climate change which influenced by the SiO2/Al2O3, the content of CaCO3, pH and organic matter in the sediment of debris flows were analyzed. The results showed that the geochemistry features of debris flow in Quaternary were distinct from other types of sediment. With the ages varying from oldness to youth, the content of SiO2, the content of CaCO3 and organic matter changed from high to low values, whereas the content of Al2O3 and the content of K2O increased. The SiO2/Al2O3 in debris flow became low from old to new ages, which showed that the tendency of climatic change became dry in this regional of Quaternary period. This result have some referential significance for the analysis of the uplift of Tiber. |
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| Keywords: | Qinghai-Tibet Plateau Quaternary debris-flow sediment geochemistry |
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