Title: PALEOCLIMATIC IMPLICATION OF DISTRIBUTION OF Rb, Rb/Sr AND MAGNETIC SUSCEPTIBILITY IN LOESS AND PALEOSOLS FROM LAOHUSHAN PROFILE,NANJING
Abstract: Xiashu loess has become an ideal natural record for cold and warm climate change, especially at the middle and lower reaches of the Yangtze River. As a marginal facies of eolian sediments, the Xiashu loess holds the regional promise of providing a record of variations in the East Asian Monsoon. Compared over a spatial and time span, the Xiashu loess record can give a picture of East Asian Monsoon variations on different time scales, its circulation process and mechanism. Paleoclimatic records from the Xiashu loess could reveal intensities of both summer and winter monsoon climate changes.In this paper, Rb and Sr concentrations as well as magnetic susceptibility have been analyzed of the 3 loess layers and 3 paleosol layers of the Laohushan profile, Nanjing. Rb contents are relatively constant, with the mean value lower than that of Luochuan loess in the Loess Plateau. This supports the fact that loess of Xiashu formation and that of Loess Plateau are both eolian dust accumulations from similar source regions. A similar curve between rubidium concentration and magnetic susceptibility suggests that they should be effective proxy for winter monsoon intensity. Rb/Sr ratios of paleosol layers are higher than those of its underlying loess layers,indicating that Rb/Sr ratios may be regarded as proxy indicator of the intensity of postdepositional chemical weathering and pedogenesis. The general increase trend of Rb/Sr ratios from the bottom upward indicates the increasing intensity of summer monsoon in the lower reach area of the Yangtze River since 120 ka.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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Cited By Count: 4
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