| 青藏高原东北部黄土沉积化学风化程度及古环境 |
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| 引用本文： | 张西营,马海州,谭红兵.青藏高原东北部黄土沉积化学风化程度及古环境[J].海洋地质与第四纪地质,2004,24(2):43-47. |
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| 作者姓名： | 张西营 马海州 谭红兵 |
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| 作者单位： | 中国科学院,青海盐湖研究所,西宁,810008 |
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| 基金项目： | 中国科学院创新工程重要方向性项目(KZCX3 SW 137) |
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| 摘 要： | 通过对青藏高原东北部西宁盆地大墩岭剖面24种常微量元素的测定及数据的处理分析，研究了该地区黄土沉积的化学风化程度及某些地球化学特征。相对上部陆壳(UCC)元素平均值，大墩岭剖面显著富集Ca、Mg、Ti、V、Cr、Ni、Y、Zr等，而亏损Si、Al、K、Na、Sr、Nb等；相对于中国黄土(CL)元素平均值，大墩岭剖面明显富含Fe、Ca、Mg、K、Ti、Cr、Mn、Cu、Rb、Sr、Nb、Ba和P，而Si、Na、Co、Ni、Pb则表现为亏损；在UCC标准化图与CL标准化图中，大墩岭黄土与古土壤变化趋势基本一致。大墩岭剖面尚处于脱Ca、Na的大陆风化初期阶段。与其他地区的风尘沉积相似，大墩岭黄土沉积很可能也起源于上部陆壳，但不排除物源存在一定差别。风尘堆积时该区的气候环境比黄土高原要干冷，这与青藏高原第四纪以来的强烈隆升有直接关系。
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| 关 键 词： | 黄土沉积 化学风化 青藏高原 古环境 |
| 文章编号： | 0256-1492(2004)02-0043-05 |
| 修稿时间： | 2003年12月26 |
CHICAL WEATHERING DEGREE AND PALEOENVIRONMENT OF LOESS DEPOSITION IN THE NORTHEAST OF QINGHAI-TIBET PLATEAU,CHINA |
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| ZHANG Xi-ying,MA Hai-zhou,TAN Hong-bing.CHICAL WEATHERING DEGREE AND PALEOENVIRONMENT OF LOESS DEPOSITION IN THE NORTHEAST OF QINGHAI-TIBET PLATEAU,CHINA[J].Marine Geology & Quaternary Geology,2004,24(2):43-47. |
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| Authors: | ZHANG Xi-ying MA Hai-zhou TAN Hong-bing |
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| Abstract: | Through testing 24 major and trace elements from Dadunling loess section in Xining basin in the northeast of Qinghai-Tibet Plateau and analyzing those data, the authors studied chemical weathering degree and some geochemical characteristics in this area. Compared to the elements' average of the upper continental crust (UCC), Dadunling section is obviously enriched in Ca, Mg, Ti, V, Cr, Ni, Y and Zr and depleted in Si, Al, K, Na, Sr and Nb. Compared to the elements' average of Chinese loess (CL), the enrichment in Fe, Ca, Mg, K, Ti, Cr, Mn, Cu, Rb, Sr, Nb, Ba and P and the depletion in Si, Na, Co, Ni and Pb are also obvious. In UCC and CL normalized maps, the variation trend of loess is basically consistent with that of paleosol in Dadunling section. Dadunling section is still in the incipient weathering stage of depletion in Ca and Na. Like other loess sections, the loess deposition of Dadunling section is probably the upper continental crust (UCC) by origin. But we cannot exclude the possibility that they have different material source areas.When the loess was deposited it was colder and drier in this area than in Loess Plateau and this is directly related to the violent uplift of Qinghai-Tibet Plateau since Quaternary. |
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| Keywords: | loess deposition chemical weathering paleoenvironment Xining basin Qinghai-Tibet Plateau |
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