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Chronology of the Baxie Loess Profile and the History of Monsoon Climates in China Between 17,000 and 6000 Years BP

Published online by Cambridge University Press:  18 July 2016

Weijian Zhou ,
Zhisheng An ,
Benhai Lin ,
Jule Xiao ,
Jinzhao Zhang ,
Jun Xie ,
Mingfu Zhou ,
S. C. Porter ,
M. J. Head  and
D. J. Donahue
Weijian Zhou
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Academia Sinica, Xi'an 710061 Shaanxi Province, Peoples Republic of China
Zhisheng An
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Academia Sinica, Xi'an 710061 Shaanxi Province, Peoples Republic of China
Benhai Lin
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Academia Sinica, Xi'an 710061 Shaanxi Province, Peoples Republic of China
Jule Xiao
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Academia Sinica, Xi'an 710061 Shaanxi Province, Peoples Republic of China
Jinzhao Zhang
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Academia Sinica, Xi'an 710061 Shaanxi Province, Peoples Republic of China
Jun Xie
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Academia Sinica, Xi'an 710061 Shaanxi Province, Peoples Republic of China
Mingfu Zhou
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Academia Sinica, Xi'an 710061 Shaanxi Province, Peoples Republic of China
S. C. Porter
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Academia Sinica, Xi'an 710061 Shaanxi Province, Peoples Republic of China
M. J. Head
Affiliation:
Quaternary Research Center, University of Washington, Seattle, Washington 98195 USA
D. J. Donahue
Affiliation:
Radiocarbon Dating Research Unit, Research School of Pacific Studies, Australian National University, Canberra, ACT 2601 Australia
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Abstract

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The valley of the Baxie River, situated in the western region of the Loess Plateau in central China, contains a loess profile 15 m thick, which can be considered representative of loess-paleosol sequences formed over the last 17 ka. Both thermoluminescence (TL) determinations on fine-grained sediment (4–11 μm) and 14C determinations on various organic fractions of paleosols from the profile have provided an extremely useful chronological framework for these sequences. These sequences indicate a weakened summer monsoon during the last glacial maximum followed by a strengthening of the summer monsoon, beginning ca. 13 ka cal bp. An abrupt change to a weakened summer monsoon regime lasted from ca. 10.9 to 10.2 ka cal bp. The Asian summer monsoon circulation, recording the Holocene optimum, then increased and lasted from ca. 10.2 to 6 ka cal bp. The organic component of samples taken down the profile has δ13C values ranging from −21 to −24‰ with respect to the PDB standard. The more positive δ13C values suggest that the proportion of C4-type plants in river valleys of the Loess Plateau increased as Asian summer monsoon influence weakened, and C3-type vegetation increased as the summer monsoon influence strengthened. Magnetic susceptibility and organic content were low during loess deposition, also reflecting weakening of summer monsoon. Two 14C determinations on the humin fraction of the organic component near the top of the lower paleosol and the base of the upper paleosol complex gave ages of 10.2 and 10.9 ka cal BP, respectively. These ages mark the beginning and termination of a brief event involving increased dust influx under weakened summer monsoon conditions.

Type
IV. Paleoclimatology
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 818 - 825
Copyright
Copyright © The American Journal of Science 

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