Variations in Sr-87/Sr-86 ratios of calcites in Chinese loess: a proxy for chemical weathering associated with the East Asian summer monsoon

doi:10.1016/S0031-0182(99)00159-5

CORC > 地球环境研究所 > 中国科学院地球环境研究所 > 黄土与第四纪地质国家重点实验室（1985-2004）

	Variations in Sr-87/Sr-86 ratios of calcites in Chinese loess: a proxy for chemical weathering associated with the East Asian summer monsoon
	Yang, JD; Chen, J; An, ZS; Shields, G; Tao, XC; Zhu, HB; Ji, JF; Chen, Y
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2000-03-15
卷号	157 期号:1-2 页码:151-159
关键词	chemical weathering east Asian monsoon loess and paleosols soil carbonates Sr isotope
DOI	10.1016/S0031-0182(99)00159-5
文献子类	Article
英文摘要	Sr-87/Sr-86 ratios of loess-paleosol calcites of Luochuan in China over the past 130 ka display a regular change with increasing trend of Sr-87/Sr-86 ratios in the following order: loess calcite-->weakly pedogenetic, paleosol calcite-->paleosol calcite-->pure secondary calcite. The observed variations in the Sr-87/Sr-86 record of loess-paleosol calcites correlate closely with the records of the magnetic susceptibility, coarse-grain fraction content in the same profile [An et al., Chin. Sci, Bull. 39 (1994) 182-184] and the SPECMAP stacked delta(18)O record of global ice volume [Imbrie et al,, in Berger et al, (Eds.), Milankovitch and Climate, Part I, Reidel, Boston, 1984, pp. 269-305]. Strata from the last glacial consist mostly of loesses and weakly developed paleosols and have lower Sr-87/Sr-86 ratios, averaging 0.71079. Paleosols which developed during the last interglacial have higher Sr-87/Sr-86 ratios, averaging 0.71131. The four periods (ca. 125-110, 98-90, 80-75 and 9-5 ka B.P.) of increased summer monsoonal rainfall coincide with the four peaks in Sr-87/Sr-86 values. A series of 87Sr/86Sr high frequency, high amplitude fluctuations is superimposed on the last glacial-interglacial cycle over the past 130 ka, occurring on millennium timescales with an average time span of about 3 ka during the last glacial. The fluctuations of the Sr-87/Sr-86 ratios of the Luochuan loess-paleosol calcites lie in the range 0.71036-0.71176 for the past 130 ka, The study shows that the Sr isotopic system in loess-paleosol calcites may therefore be an excellent proxy of chemical weathering on continents associated with the East Asian summer monsoon. (C) 2000 Elsevier Science B.V. All rights reserved.
学科主题	Physical Geography ; Geology ; Paleontology
WOS关键词	MAGNETIC-SUSCEPTIBILITY ; NORTH-ATLANTIC ; CLIMATE ; DEPOSITS ; OSCILLATIONS ; LUOCHUAN ; RECORD ; EVENTS
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000085784800009
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/11916]
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	Yang, JD,Chen, J,An, ZS,et al. Variations in Sr-87/Sr-86 ratios of calcites in Chinese loess: a proxy for chemical weathering associated with the East Asian summer monsoon[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2000,157(1-2):151-159.
APA	Yang, JD.,Chen, J.,An, ZS.,Shields, G.,Tao, XC.,...&Chen, Y.(2000).Variations in Sr-87/Sr-86 ratios of calcites in Chinese loess: a proxy for chemical weathering associated with the East Asian summer monsoon.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,157(1-2),151-159.
MLA	Yang, JD,et al."Variations in Sr-87/Sr-86 ratios of calcites in Chinese loess: a proxy for chemical weathering associated with the East Asian summer monsoon".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 157.1-2(2000):151-159.