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中国沙漠  2018, Vol. 38 Issue (3): 516-523    DOI: 10.7522/j.issn.1000-694X.2018.00012
古气候与环境变化     
常量元素记录的毛乌素沙地东南缘全新世气候变化
苏志珠1, 吴宇婧2, 孔梦园2, 马义娟2, 梁爱民3,4, 柳苗苗5, 张彩霞3
1.山西大学 历史文化学院, 山西 太原 030006
2.太原师范学院 地理科学学院, 山西 晋中 030619
3.中国科学院西北生态环境资源研究院 沙漠与沙漠化重点实验室, 甘肃 兰州 730000
4.中国科学院大学, 北京 100049
5.山西大学 环境与资源学院, 山西 太原 030006
Climate Change Revealed by Geochemical Major Elements during Holocene in the Southeastern Mu US Desert
Su Zhizhu1, Wu Yujing2, Kong Mengyuan2, Ma Yijuan2, Liang Aimin3,4, Liu Miaomiao5, Zhang Caixia3
1.Historical Culture School, Shanxi University, Taiyuan 030006, China
2.College of Geography Science, Taiyuan Normal University, Jinzhong 030619, Shanxi, China
3.Key laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
4.University of Chinese Academy of Sciences, Beijing 100049, China
5.College of Environment and Resources, Shanxi University, Taiyuan 030006, China
 全文: PDF 
摘要: 毛乌素沙地处于中国季风边缘的半干旱区,对气候变化响应敏感,是研究过去全球气候变化的理想场所。对沙地东南缘锦界剖面全新统砂质黄土-古风成砂-古土壤互层沉积序列进行研究,在OSL测年基础上,通过沉积物常量元素氧化物含量及其比值分析,结合粒度、磁化率特征,探讨了毛乌素沙地东南缘7.9 ka BP以来气候变化。结果表明:(1)地层常量元素氧化物以SiO2和Al2O3为主,其他元素含量依次为Na2O、K2O、Fe2O3、CaO、MgO。各种元素活动性不同,K、Na活动性较强,易淋失;Si活动性较稳定,风成砂中易富集;Ca、Mg、Al、Fe活动性较弱,古土壤中富集。(2)7.9 ka BP以来气候变化分为6个阶段。7.9~7.3 ka 最温暖湿润时段;7.3~6.8 ka,气候转冷干;6.8~4.3 ka,整体上温暖湿润,期间存在2次由暖湿变冷干的波动,并出现过6次风沙活动,即6.6~6.3、6.1、5.9、5.7~5.5、5.3~5.0、4.7~4.4 ka;4.3~2.5 ka BP,气候转冷干;2.5~1.8 ka BP出现过短暂湿润期,但暖湿程度不及全新世中期;1.8 ka BP以来气候渐趋干旱并接近现代气候。(3)全新世气候变化与毗邻的萨拉乌苏河流域、浑善达克沙地等记录的气候变化具有很好的一致性,这是通过东亚冬夏季风强弱消长变化对全球变化的区域响应。
关键词: 常量元素 气候变化 全新世 毛乌素沙地    
Abstract: The Mu US Desert located in the semi-arid area of northwest edge of China's monsoon region is typically sensitive to the global climate change, so this area is usually regarded as ideal area for research of climate change and desert evolution. The Jinjie profile (38°44′45″N, 110°09′56″E) of Shenmu County that located in Southeastern of Mu US Desert, has developed representative aeolian sand-paleosoil sedimentary structure. We analyzed sediment in Jinjie profile, based on data of OSL dating, geochemical major element oxides and the ratio of these elements, in combination with magnetic susceptibility and grain size. The result showed that: (1)The sediment of Jinjie profile was mainly composed of SiO2 and Al2O3, with the contents of 69.72%-81.40% and 11.04%-12.71%, the other major element oxides' contents are in order of Na>K>Fe>Ca>Mg. Chemical activity of different geochemical elements in the section showed obvious variability: K, Na and Si were more migrated and leached; while Ca, Mg, Fe, Al were obviously enriched. (2)The geochemical parameters can be used as the sensitive index to indicate the variability of Asian summer monsoon and winter monsoon. (3)The climate change in Southeastern of Mu US Desert since 7.9 ka BP can be classified into 6 stages: 7.9-7.3 ka BP, the paleosoil layer is developed, the summer monsoon was powerful and the climate was warmest and wettest during this period, chemical weathering is strong and indicating accessing to the Holocene Optimum; 7.3-6.8 ka BP, the aeolian sand is developed, and the winter monsoon became stronger and the climate was cold and dry; 6.8-4.3 ka BP, the climate was warm and wet as a whole but still occurs two climatic fluctuations which become dry and cold from warm and wet, more than, there were six aeolian events were recorded at 6.6-6.3 ka BP, 6.1 ka BP, 5.9 ka BP, 5.7-5.5 ka BP, 5.3-5.0 ka BP, 4.7-4.4 ka BP; 4.3-2.5 ka BP, the winter monsoon became stronger again, the cold and dry climate was dominated; 2.5-1.8 ka BP, the climate was warm and humid, but the summer monsoon is weaker than the Holocene Optimum; Since 1.8 ka BP, the climate becomes colder and arider.  The climate change in the study area reflects the strong and weak changes of East Asian monsoon and is coincident with the regional and global climate change.
Key words: geochemical major elements    climate change    Holocene    Mu US Desert
收稿日期: 2017-08-09 出版日期: 2018-06-14
ZTFLH:  P531  
基金资助:

国家自然科学基金重点项目(41330748);

国家重点研发计划项目子课题(2016YFC0500805)

作者简介: 苏志珠(1964—),男,山西原平人,博士,副教授,主要从事干旱区地貌与环境演化研究。E-mail: suzhizhu@163.com
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引用本文:

苏志珠, 吴宇婧, 孔梦园, 马义娟, 梁爱民, 柳苗苗, 张彩霞. 常量元素记录的毛乌素沙地东南缘全新世气候变化[J]. 中国沙漠, 2018, 38(3): 516-523.

Su Zhizhu, Wu Yujing, Kong Mengyuan, Ma Yijuan, Liang Aimin, Liu Miaomiao, Zhang Caixia. Climate Change Revealed by Geochemical Major Elements during Holocene in the Southeastern Mu US Desert. Journal of Desert Research, 2018, 38(3): 516-523.

链接本文:

http://www.desert.ac.cn/CN/10.7522/j.issn.1000-694X.2018.00012        http://www.desert.ac.cn/CN/Y2018/V38/I3/516

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