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    南海西北部过去~55 ka以来元素地球化学记录的古气候环境演变

    田成静 蔡观强 李明坤 李波 赵利

    田成静, 蔡观强, 李明坤, 李波, 赵利, 2021. 南海西北部过去~55 ka以来元素地球化学记录的古气候环境演变. 地球科学, 46(3): 975-985. doi: 10.3799/dqkx.2020.276
    引用本文: 田成静, 蔡观强, 李明坤, 李波, 赵利, 2021. 南海西北部过去~55 ka以来元素地球化学记录的古气候环境演变. 地球科学, 46(3): 975-985. doi: 10.3799/dqkx.2020.276
    Tian Chengjing, Cai Guanqiang, Li Mingkun, Li Bo, Zhao Li, 2021. Paleoclimatic and Paleoenvironmental Changes Recorded by Elemental Geochemistry in the Northwestern South China Sea since the Past~55 ka. Earth Science, 46(3): 975-985. doi: 10.3799/dqkx.2020.276
    Citation: Tian Chengjing, Cai Guanqiang, Li Mingkun, Li Bo, Zhao Li, 2021. Paleoclimatic and Paleoenvironmental Changes Recorded by Elemental Geochemistry in the Northwestern South China Sea since the Past~55 ka. Earth Science, 46(3): 975-985. doi: 10.3799/dqkx.2020.276

    南海西北部过去~55 ka以来元素地球化学记录的古气候环境演变

    doi: 10.3799/dqkx.2020.276
    基金项目: 

    中国地质调查局项目 DD20190627

    中国地质调查局项目 DD20191002

    中国地质调查局项目 DD20190209

    国家自然科学基金项目 41576049

    中国博士后科学基金项目 2019M652936

    南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项 GML2019ZD0209

    详细信息
      作者简介:

      田成静(1989-), 女, 工程师, 硕士, 主要从事海洋地质与地球化学研究.ORCID: 0000-0001-7248-9843.E-mail: tianchengjingpx@163.com

    • 中图分类号: P76

    Paleoclimatic and Paleoenvironmental Changes Recorded by Elemental Geochemistry in the Northwestern South China Sea since the Past~55 ka

    • 摘要: 南海西北部的西沙碳酸盐台地北坡受到陆源和海洋自生物质的供应,蕴含丰富的气候变化信息.为探究该区域的古气候环境演变历史,选取长828 cm的SS7岩心,利用AMS14C测年以及有孔虫氧同位素建立该区域的年代学框架,并进行元素地球化学分析.该岩心底部年龄为~55 ka BP,沉积物的元素主要受到陆源碎屑输入、海洋自生作用、氧化还原条件、海洋化学沉积作用等因素的控制.碎屑组分元素比值K/Rb和K/Ti能用于反映源区地表化学风化程度,进而反映源区过去55 ka的东亚夏季风的演化.区域东亚夏季风在约40 ka BP明显减弱,且对Heinrich、新仙女木等北半球快速变冷的事件有明显地响应.过去55 ka的东亚夏季风,不仅受到北半球低纬度夏季日照辐射量的控制,还受到赤道太平洋大气动力(如太平洋沃克环流)的影响.

       

    • 图  1  SS7岩心位置及周边地形

      底图来源于自然资源部数据服务栏目,审图号:GS(2016)2891号

      Fig.  1.  Location of the studied core SS7 and surrounding topography

      图  2  南海西沙海槽SS7柱沉积物年代地层框架

      Fig.  2.  The chronological framework of core SS7

      图  3  SS7柱沉积物常量元素含量

      Fig.  3.  Distribution of major elements of core SS7

      图  4  SS7柱沉积物微量元素含量

      Fig.  4.  Distribution of trace elements of core SS7

      图  5  元素或氧化物的主成分1和主成分2的荷载关系

      Fig.  5.  Relationships between the loading of principal components 1 and 2 of the elements or oxides

      图  6  SS7岩心的元素比值与区域和全球气候变化的对比

      a. SS7岩心的沉积速率;b. 全球相对海平面,据Rohling et al. (2009);c. K/Rb;d. K/Ti;e. 湖光岩玛珥湖的热带季雨林孢粉含量,据Mingram et al. (2004);f. 湖光岩玛珥湖木本/草本木质素比值,据Fuhrmann et al. (2003);g. 亚洲季风区平均有效湿度,据Herzschuh (2006);h. 黄土高原蓝田剖面磁化率,据Liu et al. (2005);i. 印度尼西亚Towuti湖的叶蜡正构烷烃碳同位素,据Russell et al. (2014);j. 热带太平洋东、西部的表层海水温度差,据Dyez and Ravelo (2014);k. 北纬30°夏季日照辐射量,据Berger and Loutre (1991);l. 华南石笋氧同位素,据Dykoski et al. (2005)Wang et al. (2001);m. 格陵兰岛冰心GISP2的氧同位素,据Dansgaard et al. (1993)

      Fig.  6.  Comparison of elemental ratios with regional and global climate change

      表  1  SS7岩心元素和氧化物的主成分分析结果

      Table  1.   Principal component analysis of elements and oxides of core SS7

      元素/氧化物 成分1 成分2 成分3 元素/氧化物 成分1 成分2 成分3
      CaO -0.984 -0.061 -0.097 Ta 0.841 0.097 0.073
      SiO2 0.981 -0.057 -0.049 MgO 0.795 -0.556 0.143
      TiO2 0.977 -0.137 -0.026 Co 0.712 -0.125 0.608
      Sr -0.976 -0.048 0.037 Pb 0.588 0.361 0.397
      LOI -0.970 0.201 -0.011 Ba -0.577 0.432 0.318
      Al2O3 0.964 0.110 0.155 P2O5 0.023 -0.888 0.122
      Ga 0.963 -0.065 0.192 TOC -0.390 0.849 -0.161
      Rb 0.962 -0.061 0.228 Li 0.191 0.829 0.231
      Sc 0.942 -0.165 0.221 Na2O -0.020 0.791 0.043
      Nb 0.941 0.164 0.058 W 0.224 0.785 0.074
      Cs 0.936 -0.230 0.218 Cu 0.025 0.780 0.275
      Fe2O3 0.931 -0.210 0.260 MnO 0.278 -0.777 0.231
      V 0.910 -0.001 0.259 U -0.290 0.716 0.083
      K2O 0.897 -0.374 0.072 Zn 0.254 -0.125 0.868
      Zr 0.891 -0.158 -0.263 Ni 0.007 0.414 0.815
      Th 0.848 0.222 0.317 方差(%) 58.62 19.77 6.94
      Cr 0.844 -0.258 0.118 累积方差(%) 58.62 78.39 85.33
      下载: 导出CSV
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