滇池东部第四系浅层湖滨相沉积物磁学特征及其环境意义
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X141

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国家自然科学基金(42064005)


Magnetic characteristics and environmental significance of Quaternary System shallow lakeside sediments in Eastern Dianchi Lake
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    摘要:

    为了探究昆明盆地第四纪以来的总体气候特征及滇池湖泊的演化规律。本文综合环境磁学、TOC、pH等指标,对滇池东岸DC1钻孔岩芯沉积物进行了系统研究,测试了包括质量磁化率(χ)、非磁滞剩磁(ARM)、饱和等温剩磁(SIRM)、低频磁化率(χlf)、高频磁化率(χhf)、软剩磁(IRM-300mT)、pH值及总有机碳(TOC)。结果显示:DC1沉积物磁性特征由亚铁磁性矿物主导,反铁磁性的赤铁矿在0.3-3.6 m与14.7-15.6 m两个区段含量相对较高,结合赤铁矿的形成环境,反映了这两个区段对应的沉积环境为湖退时期;另外,结合TOC与磁化率在不同深度上的关系,表明TOC的高值与细颗粒的磁性矿物溶解有关。结合TOC在各区段的含量特征表明整个21 m沉积过程所对应的气候类型以温暖气候为主。

    Abstract:

    In order to explore the overall climate characteristics of Kunming Basin since Quaternary and the evolution of Dianchi Lake. Based on environmental magnetism, TOC, pH and other indicators, this paper systematically studied the core sediments of DC1 borehole on the eastern bank of Dianchi Lake, and tested the mass susceptibility (χ), non-magnetic hysteresis remanence (ARM), saturated isothermal remanence (SIRM), low-frequency susceptibility ( χlf ), high-frequency susceptibility ( χhf ), soft remanence (IRM-300 mT), pH value and total organic carbon (TOC). The results show that the magnetic characteristics of DC1 sediments are dominated by ferrous magnetic minerals, and the content of antiferromagnetic hematite is relatively high in the 0.3-3.6 m and 14.7-15.6 m sections. Combined with the formation environment of hematite, it reflects that the sedimentary environment of these two sections is lake retreat period. In addition, combined with the relationship between TOC and magnetic susceptibility at different depths, it is shown that the high value of TOC is related to the dissolution of magnetic minerals in fine particles. Combined with the content characteristics of TOC in each section, it shows that the climate type corresponding to the whole 21 m deposition process is mainly warm climate.

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李刚强,李海侠,张小凌,等. 滇池东部第四系浅层湖滨相沉积物磁学特征及其环境意义[J]. 科学技术与工程, 2021, 21(36): 15674-15681.
Li Gangqiang, Li Haixia, Zhang Xiaoling, et al. Magnetic characteristics and environmental significance of Quaternary System shallow lakeside sediments in Eastern Dianchi Lake[J]. Science Technology and Engineering,2021,21(36):15674-15681.

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  • 收稿日期:2021-03-01
  • 最后修改日期:2021-10-03
  • 录用日期:2021-09-10
  • 在线发布日期: 2022-01-04
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