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粒度端元记录的靖边地区MIS 3以来的气候变化

巩雪娇 王攀 杨振京 董秋瑶 宋超 郭娇 陈洪云

巩雪娇, 王攀, 杨振京, 董秋瑶, 宋超, 郭娇, 陈洪云. 粒度端元记录的靖边地区MIS 3以来的气候变化[J]. 地质科技通报, 2021, 40(1): 184-191. doi: 10.19509/j.cnki.dzkq.2021.0113
引用本文: 巩雪娇, 王攀, 杨振京, 董秋瑶, 宋超, 郭娇, 陈洪云. 粒度端元记录的靖边地区MIS 3以来的气候变化[J]. 地质科技通报, 2021, 40(1): 184-191. doi: 10.19509/j.cnki.dzkq.2021.0113
Gong Xuejiao, Wang Pan, Yang Zhenjing, Dong Qiuyao, Song Chao, Guo Jiao, Chen Hongyun. Climate change recorded by the grain size end member since MIS 3 in Jingbian area[J]. Bulletin of Geological Science and Technology, 2021, 40(1): 184-191. doi: 10.19509/j.cnki.dzkq.2021.0113
Citation: Gong Xuejiao, Wang Pan, Yang Zhenjing, Dong Qiuyao, Song Chao, Guo Jiao, Chen Hongyun. Climate change recorded by the grain size end member since MIS 3 in Jingbian area[J]. Bulletin of Geological Science and Technology, 2021, 40(1): 184-191. doi: 10.19509/j.cnki.dzkq.2021.0113

粒度端元记录的靖边地区MIS 3以来的气候变化

doi: 10.19509/j.cnki.dzkq.2021.0113
基金项目: 

中国地质科学院水文地质环境地质研究所基本科研业务费项目 SK201911

中国地质科学院水文地质环境地质研究所基本科研业务费项目 SK201310

中国地质调查局地质调查工作项目 12120113005900

详细信息
    作者简介:

    巩雪娇(1996-  ), 女, 现正攻读第四纪地质学专业硕士学位, 主要从事黄土沉积区环境变化研究工作。E-mail:gxj13333532546@163.com

    通讯作者:

    王攀(1987-  ), 男, 助理研究员, 主要从事环境地球化学研究工作。E-mail:bjwp@live.com

  • 中图分类号: X141;P532

Climate change recorded by the grain size end member since MIS 3 in Jingbian area

  • 摘要: 黄土作为典型的多物源沉积物,粒度分布常呈现多峰分布。端元分析可以从复杂的沉积物粒度中分离出代表不同沉积物源和沉积动力的端元组分,在黄土研究中得到了广泛应用。利用Paterson参数化端元模型对处于毛乌素沙漠东南缘的靖边三道沟剖面粒度进行端元分离与解释,并讨论其代表的环境意义。靖边三道沟黄土可分为4个端元:EM1(众数粒径8.93 μm)为背景粉尘;EM2(众数粒径25.18 μm)为与季风环流有关的组分;EM3(众数粒径39.91 μm)和EM4(众数粒径56.37 μm)都是与冬季风有关的组分,其中EM3为黄土高原黄土主要组分,EM4与现代沙尘暴的粒级大致相同。通过对各端元组分随年龄变化的曲线进行分析,得到以下结论:该剖面记录了靖边地区自MIS 3以来经历了MIS 3(32.8~29.8 ka BP)、LGM(29.8~22.8 ka BP)、冰消期(22.8~11.3 ka BP)和全新世(8.7~1.7 ka BP)共4个气候时期。端元组分还记录了冰消期H 1事件(16.2~13.8 ka BP)、B/A事件(13.8~12.8 ka BP)、YD事件(12.8~11.3 ka BP)共3次气候快速变化事件和D-O旋回。该剖面还记录了毛乌素沙漠末次冰期经历的3次主要的扩张-收缩旋回以及全新世8.7~8.2,6.0~5.0,3.5~2.5 ka共3次干旱沙进事件。

     

  • 图 1  三道沟剖面地理位置

    Figure 1.  Location of Sandaogou loess profile

    图 2  中值粒径(Md)随深度变化曲线图

    Figure 2.  Graph of median particle size (Md) with depth

    图 3  n=4时,样品拟合的线性相关性(a)和角度偏差(b)

    Figure 3.  Linear correlation(a), and angular deviation (b) of sample fitting when n=4

    图 4  三道沟剖面黄土粒度参数化端元分解

    Figure 4.  Parameterized end-element decomposition of loess particle size in Sandaogou profile

    图 5  三道沟剖面端元含量及中值粒径(Md)含量变化曲线图

    YD.Younger Dryas事件;B/A.Bølling-Allerød暖期;D-O.Dansgaard-Deschger旋回;H1.Heinrich 1事件;LGM.末次冰盛期

    Figure 5.  Graph of end member content and median particle size(Md) content in the Sandaogou profile

    图 6  三道沟剖面 < 2 μm、EM1、>63 μm和EM4颗粒含量的变化

    YD.Younger Dryas事件;B/A.Bølling-Allerød暖期;D-O.Dansgaard-Deschger旋回;H1.Heinrich 1事件;LGM.末次冰盛期

    Figure 6.  Changes in particle content of < 2 μm, EM1, >63 μm, and EM4 in the Sandaogou profile

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