Sr-87/Sr-86 and Sr/Ca in speleothems for paleoclimate reconstruction in Central China between 70 and 280 kyr ago

doi:10.1016/j.gca.2005.01.009

	Sr-87/Sr-86 and Sr/Ca in speleothems for paleoclimate reconstruction in Central China between 70 and 280 kyr ago
	Li, HC ; Ku, TL ; You, CF ; Cheng, H ; Edwards, RL ; Ma, ZB ; Tsai, WS ; Li, MD
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2005-08-15
卷号	69 期号:16 页码:3933-3947
ISSN号	0016-7037
DOI	10.1016/j.gca.2005.01.009
文献子类	Article
英文摘要	Limestone cave deposits (speleothems) provide archives for past changes in regional climates over a range of timescales. While delta(18)O and delta(13)C in speleothem calcite have been commonly used for reconstruction of paleoclimates, we report here further efforts in the use of Sr-87/Sr-86 and Sr/Ca signals in speleothem calcite to deduce paleomonsoon variability near the Loess Plateau of central China. A two end-member mass-balance model of concentration and isotopic composition of strontium in a cave system is used to estimate variation of the Sr-87/Sr-86 ratio in sediments overlying a limestone cave. We show that this ratio reflects climate-driven variations in the provenance and the extent of chemical weathering of the epikarstic sediments. The measurements of Sr-87/Sr-86 made on a well-dated stalagmite, SFL, from Buddha Cave (33 degrees 40N' 109 degrees 05'E) show ratios of 0.71092 to 0.71133 (+/- 0.00001 as 2 sigma) during relatively cold periods (e.g., Marine Isotope Stage (MIS) 5b, 5d, and 8), lower than ratios of 0.71133 to 0.71194 during relatively warm periods (e.g., MIS 5a, 5c, 5e, and 7). As changes in the Sr/Ca ratio may affect speleothem 87Sr/86Sr, we show that the direct use of speleothem Sr-87/Sr-86 is less ideal than our modeled Sr-87/Sr-86 for the exogenic Sr source above the cave as a paleomonsoon proxy. Using the delta(18)O, delta(13)C, Sr/Ca, and Sr-87/Sr-86 records of the stalagmite, we reconstruct the variability of the East Asian monsoon for the time period between 70 and 280 kyr ago. The results show that summer monsoons were more intense during interglacial periods than during glacial periods. Copyright (c) 2005 Elsevier Ltd.
WOS关键词	TRACE-ELEMENT VARIATIONS ; UPPER CONTINENTAL-CRUST ; HOLOCENE SPELEOTHEM ; SR ISOTOPE ; HAWAIIAN SOILS ; NORTHERN CHINA ; LOESS PLATEAU ; PACIFIC-OCEAN ; CAVE WATERS ; CALCITE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000231496800001
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/65333]
专题	中国科学院地质与地球物理研究所
通讯作者	Li, HC
作者单位	1.Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA 2.Natl Cheng Kung Univ, Dept Earth Sci, Tainan 701, Taiwan 3.Univ Minnesota, Dept Geol & Geophys, Minneapolis, MN 55455 USA 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100036, Peoples R China
推荐引用方式 GB/T 7714	Li, HC,Ku, TL,You, CF,et al. Sr-87/Sr-86 and Sr/Ca in speleothems for paleoclimate reconstruction in Central China between 70 and 280 kyr ago[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2005,69(16):3933-3947.
APA	Li, HC.,Ku, TL.,You, CF.,Cheng, H.,Edwards, RL.,...&Li, MD.(2005).Sr-87/Sr-86 and Sr/Ca in speleothems for paleoclimate reconstruction in Central China between 70 and 280 kyr ago.GEOCHIMICA ET COSMOCHIMICA ACTA,69(16),3933-3947.
MLA	Li, HC,et al."Sr-87/Sr-86 and Sr/Ca in speleothems for paleoclimate reconstruction in Central China between 70 and 280 kyr ago".GEOCHIMICA ET COSMOCHIMICA ACTA 69.16(2005):3933-3947.