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鹤庆盆地湖相岩心磁化率记录及其古环境意义

徐新文 强小科 安芷生 李续斌 李鹏 孙玉芳

徐新文, 强小科, 安芷生, 等, 2010. 鹤庆盆地湖相岩心磁化率记录及其古环境意义. 地质力学学报, 16 (4): 372-382.
引用本文: 徐新文, 强小科, 安芷生, 等, 2010. 鹤庆盆地湖相岩心磁化率记录及其古环境意义. 地质力学学报, 16 (4): 372-382.
XU Xinwen, QIANG Xiaoke, AN Zhisheng, et al., 2010. MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS. Journal of Geomechanics, 16 (4): 372-382.
Citation: XU Xinwen, QIANG Xiaoke, AN Zhisheng, et al., 2010. MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS. Journal of Geomechanics, 16 (4): 372-382.

鹤庆盆地湖相岩心磁化率记录及其古环境意义

基金项目: 

国家自然科学基金项目 40572109

国家重点基础研究发展规划项目 2004CB720205

黄土与第四纪地质国家重点实验室自主部署项目 LQ0701

国家自然科学基金创新研究群体科学基金 40121303

详细信息
    作者简介:

    徐新文(1981-), 男, 硕士研究生, 第四纪地质学与全球环境变化专业, E-mail:xuxinwen@ieecas.cn

  • 中图分类号: P66

MAGNETIC SUSCEPTIBILITY OF HEQING DRILL CORE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS

  • 摘要: 鹤庆盆地位于受印度季风影响的中国西南地区, 沉积连续, 厚度大, 是古环境研究的理想场所。本文主要通过对鹤庆湖相岩心磁化率记录的分析研究, 并结合碳酸盐、烧失量和粒度特征对古环境变化的响应机理, 探讨了沉积物中磁化率的古环境指示意义。本研究发现, 磁化率与碳酸盐和烧失量具有显著的相反变化; 而与粒度的关系较为复杂。磁化率与指示粗颗粒变化的中值粒径在含砂(砾)层具有较好的正相关关系; 与指示细颗粒变化的 < 4μm颗粒的相对含量, 在湖相粘土沉积中具有较为明显的正相关关系, 表明湖相沉积物中的亚铁磁性矿物主要来自于外源带入的粘土粒级碎屑物中。通过分析磁化率对古环境变化的响应机制, 并结合碳酸盐含量、烧失量和粒度变化特征, 本研究认为鹤庆盆地湖相岩心的磁化率记录可以用来反映水动力对物源区地表的侵蚀强度和搬运状况, 与流域内植被覆盖和降雨量密切相关。在干旱的冰期, 植被覆盖度较低, 地表侵蚀加剧, 带入湖泊的粘土粒级碎屑含量增加, 磁化率增高; 在湿润的间冰期, 植被覆盖度较高, 地表侵蚀减弱, 粘土粒级碎屑物的带入量减少, 磁化率降低。

     

  • 图  1  鹤庆盆地地理位置和构造简图

    Figure  1.  Sketch map of tectonic setting of Heqing Basin

    图  2  鹤庆盆地湖相岩心磁化率(MS), 碳酸盐, 烧失量(LOI), 中值粒径, < 4μm和> 32μm颗粒的相对含量随深度的变化情况。出于作图的匀称, 其中磁化率采用对数坐标

    Figure  2.  Changes with depth of Magnetic Susceptibility, Carbonate Content, LOI, Middle Grain, Contents of < 4μm and > 32μm in Heqing Core lacustrine sediments

    表  1  鹤庆盆地湖相岩心中砾石段的碳酸盐含量

    Table  1.   Carbonate Content of the Gravels layer in Heqing Core lacustrine

    表  2  鹤庆湖相岩心中磁化率(MS)与碳酸盐, 中值粒径, < 4μm和> 32μm颗粒的相对含量之间相关系数随深度的变化情况

    Table  2.   The correlation between Magnetic Susceptibility (MS) and Carbonate Content, LOI, Middle Grain, Contents of < 4μm m and > 32μm Grains in Heqing Core lacustrine sediments

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  • 收稿日期:  2009-01-04
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