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首页> 外文期刊>Journal of Asian earth sciences >A 15,400-year record of environmental magnetic variations in sub-alpine lake sediments from the western Nanling Mountains in South China: Implications for palaeoenvironmental changes
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A 15,400-year record of environmental magnetic variations in sub-alpine lake sediments from the western Nanling Mountains in South China: Implications for palaeoenvironmental changes

机译：中国南方南岭西部高山湖泊沉积物中环境磁变化的15400年记录：对古环境变化的启示

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摘要

A detailed environmental magnetic investigation has been performed on a sub-alpine sedimentary succession deposited over the past 15,400 years in Daping Swamp in the western Nanling Mountains of South China. Magnetic parameters reveal that fine grains of pseudo-single domain (PSD) magnetite or titanomagnetite are the dominant magnetic minerals in the lake sediments and surface soils collected from the catchment, which suggests that magnetic minerals in lake sediments mainly originated from surface soil erosion of the catchment. Variation of surface runoff caused by rainfall is interpreted as the main process for transportation of weathered soils into the lake. In the Last Deglacial period (LGP, 15,400-11,500 cal a BP), the influx of magnetic minerals of detrital material may have been significantly affected by the severe dry and cold conditions of the Last Glacial Maximum. Stabilised conditions of the catchment associated with increased vegetation coverage (e.g., 8000-4500 and 2500-1000 cal a BP) limited the input of magnetic minerals. Intensive soil erosion caused by increased human activity may have given rise to abnormal increases in multiple magnetic parameters after 1000 cal a BP. Because changes in runoff and vegetation coverage are closely related to Asian summer monsoon (ASM) intensity, the sedimentary magnetism of Daping Swamp provides another source of information to investigate the evolution of the ASM.
机译：在过去的15400年中，对华南西部南岭山脉的大坪沼泽沉积的亚高山沉积层序进行了详细的环境磁研究。磁学参数表明，伪单畴（PSD）磁铁矿或钛磁铁矿的细粒是湖泊沉积物和流域收集的表层土壤中的主要磁性矿物。集水。降雨引起的地表径流变化被解释为将风化土壤运入湖泊的主要过程。在末次冰期时期（LGP，15,400-11,500 cal a BP），末次冰期最大值的严峻干燥和寒冷条件可能极大地影响了碎屑物质磁性矿物的涌入。与植被覆盖率增加有关的流域稳定条件（例如8000-4500和2500-1000 cal a BP）限制了磁性矿物的输入。 1000 cal a BP后，人类活动增加引起的土壤侵蚀加剧可能导致多个磁参数异常增加。由于径流和植被覆盖的变化与亚洲夏季风（ASM）的强度密切相关，因此大坪沼泽的沉积磁性为研究ASM的演变提供了另一个信息来源。

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  • 来源
    《Journal of Asian earth sciences》 |2018年第1期|82-92|共11页
  • 作者

    Zhong Wei; Wei Zhiqiang; Shang Shentan; Ye Susu; Tang Xiaowen; Zhu Chan; Xue Jibin; Ouyang Jun; Smol John P.;

  • 作者单位

    South China Normal Univ, Sch Geog Sci, Guangdong Prov Ctr Smart Land Res, Guangzhou 510631, Guangdong, Peoples R China;

    South China Normal Univ, Sch Geog Sci, Guangdong Prov Ctr Smart Land Res, Guangzhou 510631, Guangdong, Peoples R China;

    South China Normal Univ, Sch Geog Sci, Guangdong Prov Ctr Smart Land Res, Guangzhou 510631, Guangdong, Peoples R China;

    South China Normal Univ, Sch Geog Sci, Guangdong Prov Ctr Smart Land Res, Guangzhou 510631, Guangdong, Peoples R China;

    South China Normal Univ, Sch Geog Sci, Guangdong Prov Ctr Smart Land Res, Guangzhou 510631, Guangdong, Peoples R China;

    South China Normal Univ, Sch Geog Sci, Guangdong Prov Ctr Smart Land Res, Guangzhou 510631, Guangdong, Peoples R China;

    South China Normal Univ, Sch Geog Sci, Guangdong Prov Ctr Smart Land Res, Guangzhou 510631, Guangdong, Peoples R China;

    South China Normal Univ, Sch Geog Sci, Guangdong Prov Ctr Smart Land Res, Guangzhou 510631, Guangdong, Peoples R China;

    Queens Univ, PEARL, Kingston, ON K7L 3N6, Canada;

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  • 正文语种 eng
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  • 关键词

    Environmental magnetism; Palaeoenvironmental implication; The western Nanling Mountains; Palaeolimnology;

    机译：环境磁学;古环境意义;南岭西部;古语言学;

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