| Characteristics of geochemical weathering of L3 and S3 loess-paleosol section in the Hengshan area,Shaanxi Province北大核心CSCD |
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| 引用本文： | 杨宇哲,岳大鹏,赵景波,王晓宁,刘怡婷,刘蓉.Characteristics of geochemical weathering of L3 and S3 loess-paleosol section in the Hengshan area,Shaanxi Province北大核心CSCD[J].地理科学进展,2023(2):364-379. |
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| 作者姓名： | 杨宇哲 岳大鹏 赵景波 王晓宁 刘怡婷 刘蓉 |
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| 作者单位： | 1.陕西师范大学地理科学与旅游学院710119;2.中国科学院地球环境研究所710061; |
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| 基金项目： | 国家自然科学基金重点项目(42130507)。 |
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| 摘 要： | The Hengshan area in Shaanxi Province is located at the transitional junction of the Loess Plateau and the Mu Us sandy land in China. It is sensitive to environmental changes and has formed a unique paleoaeolian sand loess paleosol sequence. In this study, the L3 and S3 loess paleosol strata of the Liushumao section in Hengshan were selected for the analysis of the element content and related geochemical parameters in soil samples, to systematically explain the chemical weathering intensity and environmental evolution information recorded by the element geochemical index parameters during the L3 loess accumulation and S3 paleosol development in the Hengshan area. The results show that the major elements in the Liushumao section are mainly SiO2, Al2O3 and CaO. There are differences in the content of major elements in loess layers (L3-1, L3-2), paleosol layers (S3-1, S3-2), and aeolian sand layers (L3F, S3F). The contents of Al2O3 and Fe2O3 are the highest in the paleosol layer of the section, the content of CaO is the highest in the loess layer, and the content of Na2O is the highest in the aeolian sand layer. The CIA and Na/K values of the section samples reveal that the loess-paleosol layer are in the stage of primary chemical weathering, and the aeolian sand layer has not entered the stage of chemical weathering. The high values of CIA, Rb/Sr ratio, and magnetic susceptibility in the Liushumao section indicate the strengthening of weathering and pedogenesis, the relatively warm and humid climate in this period, the increasingly strong summer monsoon, and the fixed contraction of the Mu Us sandy land. The high values of the ratio of silicon and aluminium (Sa) and > 63 μm particle content indicate the occurrence of strong winter monsoon, which led to the activation and expansion of the sandy land under the effect of dry and cold climate. One extremely cold period, two cold periods, and a relatively warm period occurred in the L3 loess accumulation period, while two warm periods and one cold period occurred in the S3 paleosol development period. The change of element geochemical indicators in the Liushumao section revealed that the climate change in the Hengshan area was mainly affected by the change of strength of the East Asian winter and summer monsoon, which is generally consistent with other climate change records in North China. The study results provide more evidence for exploring the climate and environmental changes in the transitional area of the Loess Plateau and Mu Us sandy land in China. © 2023, Editorial office of PROGRESS IN GEOGRAPHY. All rights reserved.
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| 关 键 词： | 黄土—古土壤 常量元素 风化程度 横山地区 |
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