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    黄土高原东部(山西阳曲)1.2 Ma以来黄土记录的两次显著干旱化事件

    毛永栋 王治祥 庞志斌

    毛永栋, 王治祥, 庞志斌, 2021. 黄土高原东部(山西阳曲)1.2 Ma以来黄土记录的两次显著干旱化事件. 地球科学, 46(1): 272-280. doi: 10.3799/dqkx.2019.278
    引用本文: 毛永栋, 王治祥, 庞志斌, 2021. 黄土高原东部(山西阳曲)1.2 Ma以来黄土记录的两次显著干旱化事件. 地球科学, 46(1): 272-280. doi: 10.3799/dqkx.2019.278
    Mao Yongdong, Wang Zhixiang, Pang Zhibin, 2021. Two Significant Stages in the Aridification of the Eastern Chinese Loess Plateau since 1.2 Ma. Earth Science, 46(1): 272-280. doi: 10.3799/dqkx.2019.278
    Citation: Mao Yongdong, Wang Zhixiang, Pang Zhibin, 2021. Two Significant Stages in the Aridification of the Eastern Chinese Loess Plateau since 1.2 Ma. Earth Science, 46(1): 272-280. doi: 10.3799/dqkx.2019.278

    黄土高原东部(山西阳曲)1.2 Ma以来黄土记录的两次显著干旱化事件

    doi: 10.3799/dqkx.2019.278
    基金项目: 

    中国地质调查局地质调查工作项目 12120113059300

    国家自然科学基金 41322013

    详细信息
      作者简介:

      毛永栋(1983-), 男, 工程师, 硕士, 主要从事地质矿产和区域地质调查等研究.ORCID:0000-0003-4850-1413.E-mail:mmmyyyddd@163.com

      通讯作者:

      王治祥, ORCID:0000-0001-8640-2761.E-mail:wangzhi8905@126.com

    • 中图分类号: P532

    Two Significant Stages in the Aridification of the Eastern Chinese Loess Plateau since 1.2 Ma

    • 摘要: 重建第四纪时期亚洲内陆干旱过程和沙漠的扩张历史对于我们了解东亚冬季风演变具有重要意义.然而目前对于黄土高原的干旱过程的研究主要聚焦于吕梁山以西的黄土地区,对于其东部还缺乏相应研究.为此,我们对吕梁山东部约1.2 Ma以来的阳曲黄土剖面进行了磁化率和元素含量测试,结果显示阳曲地区在1.2 Ma以来经历了两次明显的干旱事件.第一次干旱化事件发生在0.94 Ma,表现为Si、Fe百分含量和Rb/Sr比值显著减小而Ca含量明显增加,这次事件可能主要与大气CO2浓度下降导致全球冰量增加,特别是北半球冰盖扩张相关.第二次事件发生在0.31 Ma左右,Rb/Sr比值显著下降,Ca含量显著增高,这次事件可能是由于忻定古湖裂解引起区域干旱增强所致.

       

    • 图  1  黄土高原东部阳曲的地理位置(黑色圆圈)

      黄土分布的范围参考Sun et al. (2010); 红色圆圈代表了黄土高原其他发表了磁化率数据的地区,用于和阳曲地区进行空间上对比; LC.洛川; LT.灵台; JB.靖边; YQ.阳曲; ZJC.赵家川

      Fig.  1.  Location of the Yangqu site (black dot) in the Chinese Loess Plateau

      图  2  阳曲和黄土高原其他地区剖面的磁化率对比

      灵台剖面来自于Ding et al. (1999); 赵家川剖面来自于Sun et al. (2006); 靖边剖面来自于Ding et al. (2005); 洛川剖面来自于Hao et al. (2012)

      Fig.  2.  Spatial linkages of magnetic susceptibility (MS) between the Yangqu site and other parts in the Loess Plateau

      图  3  过去1.2 Ma以来阳曲古气候指标和深海氧同位素及天文理论曲线对比

      a.北纬65°夏季太阳辐射(绿色)和偏心率曲线(红色)(Laskar et al., 2004); b.底栖有孔虫δ18O LR04序列(Lisiecki and Raymo, 2005); c~g.分别是阳曲剖面的磁化率,Si,Fe,Ca百分含量和Rb/Sr比率

      Fig.  3.  Comparsion of the paleoclimatic proxies in Yangqu section with other palaeoclimatic data of the past 1.2 Ma

      图  4  阳曲剖面的野外露头照片

      图中显示剖面颜色明显的两次转变

      Fig.  4.  Field picture from the Yangqu Section

      图  5  过去1.2 Ma以来阳曲剖面的Rb/Sr比值和其他古气候记录对比

      a.阳曲地区Rb/Sr比值;b.黄土高原中部风尘沉积质量堆积速率(MAR)(Sun and An, 2005); c.海表温度序列(SST)(Martinez-Boti et al., 2015); d.冰芯记录的大气pCO2(绿色)(Lüthi et al., 2008; Petit et al., 1999; Siegenthaler et al., 2005)和海表水记录的大气pCO2(紫色线)(Hönisch et al., 2009);e.来自于ODP1123Mg/Ca记录的冰量(Elderfield et al., 2012)和模拟的结果(Bintanja et al., 2005

      Fig.  5.  Comparsion of the Rb/Sr ratio in Yangqu section with other palaeoclimatic data of the past 1.2 Ma

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    • 收稿日期:  2019-11-14
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