渤海沉积记录的末次冰期千年尺度古环境与古气候变化

方文丽, 姚政权, 石学法, 葛晨东, 乔淑卿, 李小艳, 董智, 王颖. 渤海沉积记录的末次冰期千年尺度古环境与古气候变化[J]. 海洋地质与第四纪地质, 2019, 39(3): 61-71. doi: 10.16562/j.cnki.0256-1492.2018092101
引用本文: 方文丽, 姚政权, 石学法, 葛晨东, 乔淑卿, 李小艳, 董智, 王颖. 渤海沉积记录的末次冰期千年尺度古环境与古气候变化[J]. 海洋地质与第四纪地质, 2019, 39(3): 61-71. doi: 10.16562/j.cnki.0256-1492.2018092101
FANG Wenli, YAO Zhengquan, SHI Xuefa, GE Chendong, QIAO Shuqing, LI Xiaoyan, DONG Zhi, WANG Ying. Millennial-scale paleoenvironment and paleoclimate changes recorded in the Bohai Sea sediments during the last glacial period[J]. Marine Geology & Quaternary Geology, 2019, 39(3): 61-71. doi: 10.16562/j.cnki.0256-1492.2018092101
Citation: FANG Wenli, YAO Zhengquan, SHI Xuefa, GE Chendong, QIAO Shuqing, LI Xiaoyan, DONG Zhi, WANG Ying. Millennial-scale paleoenvironment and paleoclimate changes recorded in the Bohai Sea sediments during the last glacial period[J]. Marine Geology & Quaternary Geology, 2019, 39(3): 61-71. doi: 10.16562/j.cnki.0256-1492.2018092101

渤海沉积记录的末次冰期千年尺度古环境与古气候变化

  • 基金项目:
    青岛海洋科学与技术试点国家实验室鳌山科技创新计划项目“深海地质过程与资源环境效应”(2016ASKJ13);中央级公益性科研院所基本科研业务费专项资金“海洋一所束星北青年学者基金”(2018S01)
详细信息
    作者简介: 方文丽(1995—),女,硕士生,主要从事海洋沉积方面研究,E-mail:18362979806@163.com
    通讯作者: 石学法(1965—),男,研究员,博士,博士生导师,主要从事海洋沉积学与海底成矿作用方面研究,E-mail:xfshi@fio.org.cn 葛晨东(1966—),女,教授,博士,主要从事海洋生物地球化学方向研究,E-mail:gcd@nju.edu.cn
  • 中图分类号: P736.21

  • 文凤英编辑

Millennial-scale paleoenvironment and paleoclimate changes recorded in the Bohai Sea sediments during the last glacial period

More Information
  • 末次冰期千年尺度古气候变化事件在全球大部分载体中均有不同程度的记录,但在海岸带—陆架区的沉积记录中该事件还未见有报道。对取自渤海的BH08孔上部26m的岩芯进行了高分辨率粒度测试与分析,结合AMS 14C测年结果和微体古生物特征,探讨了研究区末次冰期以来古环境和古气候变化。运用粒级-标准偏差法对粒度数据进行研究,发现BH08孔敏感组分(88.4~148.7μm)的变化记录了末次冰期D-O(Dansgarrd-Oeschger)旋回冷暖事件:在暖期时敏感粒级粗组分(88.4~148.7μm)的含量低,而在冷期时含量高,且可以与反映东亚夏季风的指标对应。在暖期时,强盛的夏季风带来丰富的降水,增加的径流可以将粗粒沉积物搬运至更远的下游区,且暖湿气候有利于植被的发育,使得流域内粗粒沉积物减少;而在冷期呈现相反的变化趋势。我们推测,在末次冰期低海面的背景下,格陵兰和北大西洋等高纬地区气候变化导致大气环流和/或洋流系统发生改变,从而对东亚夏季风降水的调控造成河流输入物质的变化可能是造成BH08岩芯敏感组分变化的主要原因。

  • 加载中
  • 图 1  研究区和BH08钻孔位置图

    Figure 1. 

    图 2  BH08岩性(a, b)、粒度(c)、颜色反射率a*(g)以及有孔虫与介形虫含量[35](d, e, f)随深度的变化及其与深海氧同位素LR04 δ18O[36](h)的对应关系

    Figure 2. 

    图 3  BH08孔标准偏差随粒级的变化曲线

    Figure 3. 

    图 4  粒级-标准偏差法获得的敏感粒级的不同组分含量及平均粒径

    Figure 4. 

    图 5  BH08岩芯颜色反射率a*(a)、粒度序列(b)与格陵兰GISP2冰芯(c)[13]、葫芦洞δ18O (d)[6]、三宝洞δ18O(d)[43]以及LR04 δ18O(e)[36]反映的海平面变化曲线的对比

    Figure 5. 

    表 1  BH08孔年代控制点

    Table 1.  Age control points of core BH08

    深度/m 样品类型 14C年龄/aBP 距今日历年龄/cal.aBP 沉积速率/(cm·ka-1)
    1 0.18* 贝壳 600±20 498~300 45.11
    2 0.66 混合底栖有孔虫 2190±30 2145~1846 30.07
    3 0.96 混合底栖有孔虫 2740±30 2818~2495 45.39
    4 1.37 混合底栖有孔虫 5520±30 6252~5957 11.89
    5 2.25 混合底栖有孔虫 7290±30 8054~7790 48.42
    6 3.47* 贝壳 8490±40 9470~8153 137.16
    7 4.09* 混合底栖有孔虫 9010±35 10165~9762 53.82
    8 5.46 混合底栖有孔虫 7930±30 8756~8415 -
    9 8.17* 贝壳 9020±40 10175~9769 -
    10 15.79# OSL - 52500 27.51
    11 45.49** 控制点 - 140000 33.94
    注:*引自文献[33, 34],**引自文献[33],#引自姚政权等未发表数据。
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出版历程
收稿日期:  2018-09-21
修回日期:  2019-01-23
刊出日期:  2019-06-28

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