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    岷江叠溪古堰塞湖沉积物中孢粉特征

    王小群 王兰生

    王小群, 王兰生, 2013. 岷江叠溪古堰塞湖沉积物中孢粉特征. 地球科学, 38(5): 975-982. doi: 10.3799/dqkx.2013.095
    引用本文: 王小群, 王兰生, 2013. 岷江叠溪古堰塞湖沉积物中孢粉特征. 地球科学, 38(5): 975-982. doi: 10.3799/dqkx.2013.095
    WANG Xiao-qun, WANG Lan-sheng, 2013. The Pollen and Spore Characteristics of the Diexi Ancient Dammed Lake on the Upstream of Minjiang River. Earth Science, 38(5): 975-982. doi: 10.3799/dqkx.2013.095
    Citation: WANG Xiao-qun, WANG Lan-sheng, 2013. The Pollen and Spore Characteristics of the Diexi Ancient Dammed Lake on the Upstream of Minjiang River. Earth Science, 38(5): 975-982. doi: 10.3799/dqkx.2013.095

    岷江叠溪古堰塞湖沉积物中孢粉特征

    doi: 10.3799/dqkx.2013.095
    基金项目: 

    中国国家自然科学基金 41072230

    地质灾害防治与地质环境保护国家重点实验室自主课题 SKLGP2012Z008

    详细信息
      作者简介:

      王小群(1972-), 教授, 博士, 主要从事地质工程与岩土工程专业的教学与科研工作.E-mail: wangxiaoqun@cdut.edu.cn

    • 中图分类号: P642;X141

    The Pollen and Spore Characteristics of the Diexi Ancient Dammed Lake on the Upstream of Minjiang River

    • 摘要: 对岷江上游叠溪古堰塞湖200余米厚的堰塞湖相沉积物进行了大量采样测试分析.主要对湖相沉积物中的孢粉和沉积年代进行了测试.通过测试获得了古堰塞湖沉积物的沉积时间和气候环境特征.古堰塞湖沉积物底部形成时间约3.0万年, 靠近顶部形成时间约为1.5万年前.孢粉测试结果显示, 古堰塞湖沉积物沉积剖面可划分为9个气候环境段: (1)温凉半湿润的针阔叶混交森林草原气候环境; (2)寒冷干旱的针叶森林草原气候环境; (3)温凉半干旱的针、阔叶混交疏林草原气候环境; (4)温暖湿润的针、阔叶混交森林草原气候环境; (5)凉半干的针、阔叶混交疏林草原气候环境; (6)温湿的针叶疏林草原气候环境; (7)温凉半干旱的针阔叶混交疏林草原气候环境; (8)凉半湿润的森林草原气候环境; (9)冷干的疏林草原气候环境.研究成果揭示了青藏高原东部边缘至四川盆地过渡带3.0~1.5万年间的古气候古环境演化特征, 为区域环境研究提供了宝贵的资料.

       

    • 图  1  叠溪古堰塞湖分布平面

      Fig.  1.  The Diexi ancient lake distribution plan

      图  2  湖相沉积物

      Fig.  2.  Lacustrine sediments

      图  3  主要孢粉照片

      1~4为蕨类藻类植物孢子;5~12为灌木及草本植物花粉;13~22为乔木植物花粉

      Fig.  3.  Main pollen and spore photos

      图  4  湖相沉积物剖面孢粉图式

      Fig.  4.  Pollen and spore schema of lacustrine sediment profile

      表  1  AMS14C测年成果

      Table  1.   Dating results of AMS14C

      编号 取样位置 高程(m) AMS14C Age(a B.P.) Error(1σa B.P.)
      ZK1-2 叠溪古堰塞湖ZK1 2 306 16 902 75
      ZK3-1 叠溪古堰塞湖ZK3 2 206 22 870 105
      ZK2-5 叠溪古堰塞湖ZK2 2 094 30 830 200
        注:表中计算年龄所用的14C半衰期为5 568年.
      下载: 导出CSV

      表  2  沉积物剖面时间序列

      Table  2.   Time series of sediment profile

      高程(m) 2 095 2 141 2 173 2 212 2 228 2 273 2 289 2 306 2 322 2 334
      14C Age (a B.P.) 30 830 27 531 25 236 22 512 21 557 18 871 17 917 16 902 15 650 14 992
      下载: 导出CSV

      表  3  沉积物剖面气候环境分段特征

      Table  3.   Characteristics of climate and environment section on the sediment profile

      分段编号 高程(m) 时间(a B.P.) 气候特征 环境特征
      1 2 095~2 141 30 830~27 531 温凉半湿润 针阔叶混交森林草原
      2 2 141~2 173 27 531~25 236 寒冷干旱 针叶森林草原
      3 2 173~2 212 25 236~22 512 温凉半干旱 针阔叶混交疏林草原
      4 2 212~2 228 22 512~21 557 温暖湿润 针阔叶混交森林草原
      5 2 228~2 273 21 557~18 871 凉半干旱 针阔叶混交疏林草原
      6 2 273~2 289 18 871~17 917 温暖湿润 针叶疏林草原
      7 2 289~2 305 17 917~16 902 温凉半干旱 针阔叶混交疏林草原
      8 2 305~2 322 16 902~15 650 凉半湿润 森林草原
      9 2 322~2 334 15 650~14 992 寒冷干旱 疏林草原
      下载: 导出CSV
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    • 收稿日期:  2012-11-28
    • 刊出日期:  2013-09-15

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