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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 | |
2000-03-15 | |
发表期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY |
卷号 | 157期号:1-2页码:151-159 |
文章类型 | Article |
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. |
关键词 | chemical weathering east Asian monsoon loess and paleosols soil carbonates Sr isotope |
学科领域 | Physical Geography ; Geology ; Paleontology |
DOI | 10.1016/S0031-0182(99)00159-5 |
关键词[WOS] | MAGNETIC-SUSCEPTIBILITY ; NORTH-ATLANTIC ; CLIMATE ; DEPOSITS ; OSCILLATIONS ; LUOCHUAN ; RECORD ; EVENTS |
收录类别 | SCI ; SCIE |
语种 | 英语 |
WOS研究方向 | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
WOS记录号 | WOS:000085784800009 |
出版者 | ELSEVIER SCIENCE BV |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | 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. |
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