ZR/RB RATIO IN THE CHINESE LOESS SEQUENCES AND ITS IMPLICATION FOR CHANGES IN THE EAST ASIAN WINTER MONSOON STRENGTH
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dc.contributor.author | Chen J. | |
dc.contributor.author | Chen Y. | |
dc.contributor.author | Liu L. | |
dc.contributor.author | Ji J. | |
dc.contributor.author | Balsam W. | |
dc.contributor.author | Sun Y. | |
dc.contributor.author | Lu H. | |
dc.date.accessioned | 2024-08-22T05:32:29Z | |
dc.date.available | 2024-08-22T05:32:29Z | |
dc.date.issued | 2006 | |
dc.identifier | https://elibrary.ru/item.asp?id=12091880 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2006, 70, 6, 1471-1482 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/44704 | |
dc.description.abstract | The long-term dust accumulation sequences on the Chinese Loess Plateau (CLP) provide a valuable opportunity to study the evolution of East Asian winter monsoon strength. Grain size of bulk samples of loess deposits, though widely used, is a modified measure of the strength of winter monsoon wind due to modification by post-depositional weathering and pedogenesis. This study proposes a new and reliable geochemical climate proxy that records the variability of the East Asian winter monsoon on the CLP. Six loess-paleosol sections on the Plateau were selected for measuring concentrations of the trace elements Zr and Rb as well as grain size. Variations of the Zr/Rb ratio in all the sections encompassing the last 130 ka display a generally similar pattern to that of mean grain size of bulk samples (MGSB). Though a positive correlation exists between the Zr/Rb ratio and MGSB, the correlation coefficient decreases in southern and eastern sections where intense pedogenesis occurred in the relatively warm and humid climates. Long-term Zr/Rb variation in the Lingtai section exhibits amplitudes and frequencies similar to those in MGSB and the mean grain size of quartz particles (MGSQ, accepted as a more reliable proxy than MGSB) in the upper loess-paleosol sequence over the past 2.6 Ma. However, for the underlying Red Clay formation, in the interval from about 7-2.6 Ma B.P., the MGSB record is relatively stable, whereas both the Zr/Rb ratio and MGSQ show distinct variability and display amplitudes similar to those observed in the overlying loess-paleosol sequence. These results demonstrate that the Zr/Rb ratio reflects original eolian grain size and may serve as a reliable index of the strength of East Asian winter monsoon winds. ? 2005 Elsevier Inc. All rights reserved. | |
dc.subject | DUST | |
dc.subject | LOESS | |
dc.subject | MONSOON | |
dc.subject | PALEOCLIMATE | |
dc.subject | PROXY CLIMATE RECORD | |
dc.title | ZR/RB RATIO IN THE CHINESE LOESS SEQUENCES AND ITS IMPLICATION FOR CHANGES IN THE EAST ASIAN WINTER MONSOON STRENGTH | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.gca.2005.11.029 |
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