Authigenic uranium in marine sediments of the Benguela current upwelling region during the last glacial period

Ein Fen Yu*, Chih Hung Liang, Min Te Chen

*此作品的通信作者

    研究成果: 雜誌貢獻期刊論文同行評審

    5 引文 斯高帕斯(Scopus)

    摘要

    Anomalously high uranium contents and 238U/232Th activity ratios deposited during the oxygen isotope stages 2 to 4 are observed in the MD962085 core from the Benguela Current upwelling area. In conjunction with the activity ratio of 234U/238U, the high uranium contents found in this core cannot be considered as detrital; instead, they must be of authigenic origin. The high biological productivity in the overlying seawater may have induced a high flux of organic matter resulting, directly or indirectly, in a reducing environment, and may have led to the addition of authigenic uranium to the sediments during the last glacial period. The correspondence between the variations in authigenic U content, %TOC, and 230Thex-normalized TOC flux supports this suggestion. The observed high paleoproductivity during the last glacial period of the core may be due to the greater intensity of upwelling in the Benguela Current upwelling system.

    原文英語
    頁(從 - 到)201-214
    頁數14
    期刊Terrestrial, Atmospheric and Oceanic Sciences
    10
    發行號1
    DOIs
    出版狀態已發佈 - 1999 三月

    ASJC Scopus subject areas

    • 海洋學
    • 大氣科學
    • 地球與行星科學(雜項)

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