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Book Chapter

Radiometric dating of the late Quaternary summer monsoon on the Loess Plateau, China

By
T. Stevens
T. Stevens
Department of Geography, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK
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H. Lu
H. Lu
School of Geographical and Oceanographical Sciences, Nanjing University, Nanjing 210093, China
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Published:
January 01, 2010

Abstract

Recent advances in radiometric dating have enabled independent investigation into monsoon variations. In this study, summer monsoon pedogenesis proxies (CaCO3 and magnetic susceptibility) have been analysed by optically stimulated luminescence (OSL) age for five loess-palaeosol sections over the Chinese Loess Plateau. The use of CaCO3 is complicated by the multiple influences on its variation. However, changes in magnetic susceptibility can be used as a proxy for summer monsoon induced pedogenesis. The data suggest that the summer monsoon in north-central China is not prone to high frequency shifts, although abrupt transitions occur. The overall patterns show general decreasing trends from c. 50 to 18 ka. However, between 9 and 6 ka, magnetic susceptibility increases abruptly and dramatically at the sites. These findings suggest that the Holocene ‘optimum’ in the region may be a more recent phenomenon than previously suggested, and that this summer monsoon intensity increase significantly post-dates the insolation peak occurring at 11.5 ka. An apparent close correspondence to ice volume is suggested to be a consequence of forcing via atmospheric circulation. Independently dated records that employ high sampling resolution can be used to test this hypothesis, together with suggestions over the apparent lag between insolation forcing and monsoon response.

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Contents

Geological Society, London, Special Publications

Monsoon Evolution and Tectonic–Climate Linkage in Asia

P. D. Clift
P. D. Clift
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R. Tada
R. Tada
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H. Zheng
H. Zheng
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Geological Society of London
Volume
342
ISBN electronic:
9781862395909
Publication date:
January 01, 2010

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