长江和黄河入海沉积物的物源识别研究进展

DISTINGUISHING THE CHANGJIANG AND HUANGHE SEDIMENTS: A REVIEW

  • 摘要: 长江和黄河每年输送近16亿t泥沙入海,是中国东部陆架海区最主要的陆源物质供应者。长江和黄河沉积物的物源识别一直是中国东部陆架海区沉积学热点问题之一,受到了广泛的关注。近年来,众多国内外学者运用矿物学、地球化学以及环境磁学等方法,对长江和黄河入海沉积物的物源识别做了深入研究,已经取得长足进展。在综合前人研究成果的基础上,系统地总结了长江、黄河物源识别指标,评述了各自的优劣,并对未来两条大河的物源识别工作提出了展望。

     

    Abstract: Two large rivers, Huanghe and Changjiang, deliver a huge amount of terrigenous sediment up to more than 1.6 billion tons per year to the East China Seas. The sediment, which predominates the epicontinental sea, has immense impacts on the depositional, aquatic and ecological systems, as well as geochemical cycles. Therefore, distinguishing the provenances of the sediments is critical not only for understanding the temporal and spatial dispersal pattern of the sediments from the Changjiang and Huanghe, but also for interpretation and reconstruction of paleoenvironmental changes preserved in the deposits. In recent years, great advances in distinguishing the Changjiang and Huanghe sediments have been reached by multi-disciplinary studies (Mineralogy, Geochemistry, and Magnetics etc.); however, there still remains considerable uncertainty in the mixing areas. In this paper, we provided an overview on this topic by summarizing the different discriminating proxies. Future research topics are also suggested.

     

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