| 中国黄土颜色变化的控制因素和古气候意义 |
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| 引用本文： | 何柳,孙有斌,安芷生.中国黄土颜色变化的控制因素和古气候意义[J].地球化学,2010,39(5):447-455. |
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| 作者姓名： | 何柳 孙有斌 安芷生 |
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| 作者单位： | 1. 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西,西安,710075;中国科学院研究生院,北京,100049
2. 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西,西安,710075 |
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| 摘 要： | 选择位于黄土高原东南缘的渭南剖面和中部的西峰剖面末次间冰期以来的黄土-古土壤序列，研究了黄土颜色（亮度和红度）变化的时空特征及其主要控制因素。结果表明，黄土的亮度变化主要与铁氧化物、有机质、碳酸盐的含量有关，三者的影响依次减弱，而红度变化则主要受控于铁氧化物的种类和含量。值得注意的是，渭南剖面的红度变化与亮度和磁化率记录在Ls／S1过渡时段明显不一致，表明单一的磁化率或颜色指标（红度）在重建夏季风强度时都有一定的局限性。尽管磁化率和红度变化受控的铁氧化物不同，但两者都同风化成壤关系密切，本文综合考虑两个指标，通过对磁化率和红度标准化，提出一个新的Stack指标，用于反演末次间冰期以来夏季风的演化，为深入理解东亚夏季风演化尤其是倒数第二次冰消期夏季风的增强特征提供了新的线索。
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| 关 键 词： | 中国黄土 亮度 红度 磁化率 夏季风 |
Changing color of Chinese loess:Controlling factors and paleocliamtic significances |
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| HE Liu,SUN You-bin,AN Zhi-sheng.Changing color of Chinese loess:Controlling factors and paleocliamtic significances[J].Geochimica,2010,39(5):447-455. |
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| Authors: | HE Liu SUN You-bin AN Zhi-sheng |
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| Institution: | HE Liu1,2,SUN You-bin1 and AN Zhi-sheng1 1.State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710075,China,2.Graduate University of Chinese Academy of Sciences,Beijing 100049 |
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| Abstract: | Two loess-paleosol sequences at the Weinan and Xifeng sections spanning the last climatic cycle were investigated to better understand the spatial and temporal variations of the soil color(e.g.,lightness and redness) and their major controlling factors.Our results show that lightness and redness are significantly different between loess and paleosols layers,with relatively low lightness values and high redness values in the paleosol layers.Variations in the lightness are strongly linked to the concentration... |
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| Keywords: | Chinese loess lightness redness magnetic susceptibility summer monsoon |
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