CHRONOLOGY OF THE BAXIE LOESS PROFILE AND THE HISTORY OF MONSOON CLIMATES IN CHINA BETWEEN 17,000 AND 6000 YEARS BP

IEECAS OpenIR > 黄土与第四纪地质国家重点实验室（1985-2004）

	CHRONOLOGY OF THE BAXIE LOESS PROFILE AND THE HISTORY OF MONSOON CLIMATES IN CHINA BETWEEN 17,000 AND 6000 YEARS BP
	ZHOU, WJ; AN, ZS; LIN, BH; XIAO, JL; ZHANG, JZ; XIE, J; ZHOU, MF; PORTER, SC; HEAD, MJ; DONAHUE, DJ
	1992
发表期刊	RADIOCARBON
卷号	34 期号:3 页码:818-825
文章类型	Article; Proceedings Paper
摘要	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 mum) and C-14 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 ap. 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 deltaC-13 values ranging from -21 to -24 parts per thousand with respect to the PDB standard. The more positive deltaC-13 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 C-14 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.
学科领域	Geochemistry & Geophysics
关键词[WOS]	C-14
收录类别	SCI ; SCIE
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:A1992KF38900072
出版者	UNIV ARIZONA DEPT GEOSCIENCES
引用统计	被引频次：28[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/11980
专题	黄土与第四纪地质国家重点实验室（1985-2004）
推荐引用方式 GB/T 7714	ZHOU, WJ,AN, ZS,LIN, BH,et al. CHRONOLOGY OF THE BAXIE LOESS PROFILE AND THE HISTORY OF MONSOON CLIMATES IN CHINA BETWEEN 17,000 AND 6000 YEARS BP[J]. RADIOCARBON,1992,34(3):818-825.
APA	ZHOU, WJ.,AN, ZS.,LIN, BH.,XIAO, JL.,ZHANG, JZ.,...&DONAHUE, DJ.(1992).CHRONOLOGY OF THE BAXIE LOESS PROFILE AND THE HISTORY OF MONSOON CLIMATES IN CHINA BETWEEN 17,000 AND 6000 YEARS BP.RADIOCARBON,34(3),818-825.
MLA	ZHOU, WJ,et al."CHRONOLOGY OF THE BAXIE LOESS PROFILE AND THE HISTORY OF MONSOON CLIMATES IN CHINA BETWEEN 17,000 AND 6000 YEARS BP".RADIOCARBON 34.3(1992):818-825.