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huang tu gao yuan wan shang xin shi hong zhan tu li du de kong jian bian hua
Pages: 182-185
Year: Issue:  2

Keyword:  上新世红粘土粒度空间变化黄土高原;
Abstract: The Tertiary ‘Red Clay’ deposit in Chinese Loess Plateau has attracted conside rable research interests in recent years as it may provide the information of pa leoclimate i n Northern China. The evidences from sedimentology, geochemistry, geomorphology and field survey indicate that the ‘Red Clay’ may be of eolain origin, the sam e as the overlying loess. However, it is controversial on which wind system transp orted the deposit.   In this paper, the grain size of bulk samples and chemically isolated quartzes f rom ‘Red Clay’ of the late Pliocene are investigated. The samples were taken f ro m six locations spanning 550 km from the north to the south in the Loess Plateau . The results show that, the mean sizes of both bulk and quartz samples decease southwards, so does the coarse-faction content (>42 μm% and >30 μm%). Moreo ver, t he ‘Red Clay’ samples include a great deal of particles more than 20 μm, whic h w as proved to be transported only by subaerial wind. These, therefore, suggest th at it is mainly the northern subaerial wind rather than the supernal wind that t ransported the dust of ‘Red Clay’. The spatial distribution of ‘Red Clay’ is com parable to that of overlying eolian loess, which proves the ‘Red Clay’ may be fo rmed in a little bit dry environment, but it is not so dry as to the environment the loess deposited.
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