Abnormal Rb Sr ratio in lacustrine sediments of Qaidam Basin, NE QinghaieTibetan Plateau  A significant role of aeolian dust input

doi:10.1016/j.quaint.2016.12.050

CORC > 青海盐湖研究所 > 中国科学院青海盐湖研究所 > 盐湖地质与环境实验室

	Abnormal Rb Sr ratio in lacustrine sediments of Qaidam Basin, NE QinghaieTibetan Plateau A significant role of aeolian dust input
	An, FuYuan; Lai, ZhongPing; Liu, XiangJun; Fan, QiShun; Wei, HaiCheng
刊名	QUATERNARY INTERNATIONAL
	2018-03-05
卷号	469 页码:44-57
ISSN号	1040-6182
DOI	10.1016/j.quaint.2016.12.050
英文摘要	The Rb/Sr ratio is an important indicator of weathering intensity in both lacustrine and loess sediments because of the inertness of the Rb element and the activity of the Sr element during the weathering process. Generally, the environmental interpretation of Rb/Sr ratio proxy in lacustrine sediments is contrary to that in the loess-paleosol sequence: it shows a negative correlation between the Rb/Sr ratio and chemical weathering intensity in lacustrine sediments, but shows a positive pattern in the loesspaleosol sequence. However, in this study, we investigated the Rb/Sr ratio of a lacustrine core (ISL1A) from Qarhan Salt Lake (QSL) in eastern Qaidam Basin (QB), and found the Rb/Sr ratio indicated a positive correlation with regional precipitation. This pattern is similar to that of the loess-paleosol sequence rather than the lacustrine sediments. According to grain size statistics and the comparison of Rb/Sr ratio with other proxies (halite and calcite contents, grain size, and F values of grain size discriminant function), we preliminarily proposed that the abundant input of aeolian materials, transported by the strong northwest wind, cause these unexpected Rb/Sr ratio fluctuations in the ISL1A core. The comparison between background Rb and Sr elemental data of relevant regions and these of the core indicated the aeolian origin of Rb/Sr ratio in the lacustrine sediments, and the Rb and Sr elemental composition probably represents the geochemical characteristics of the dust source area. The Sr-Nd isotopic composition indicates that the erosive paleo-lake strata in western QB could be the origin of aeolian materials in lacustrine sediments in the QSL, as well as the loess deposits in Dulan County, Qinghai Lake Basin, and Xining Basin. The regional correlation between proxies of the ISL1A core and other aeolian records also supports the aeolian origin of detrital input in the core. Finally, we propose that the origin of the detrital input must be distinguished before the Rb/Sr ratio is applied as a weathering intensity proxy in lacustrine sediments, especially in arid basins. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.isl.ac.cn/handle/363002/34409]
专题	青海盐湖研究所_盐湖地质与环境实验室
推荐引用方式 GB/T 7714	An, FuYuan,Lai, ZhongPing,Liu, XiangJun,et al. Abnormal Rb Sr ratio in lacustrine sediments of Qaidam Basin, NE QinghaieTibetan Plateau A significant role of aeolian dust input[J]. QUATERNARY INTERNATIONAL,2018,469:44-57.
APA	An, FuYuan,Lai, ZhongPing,Liu, XiangJun,Fan, QiShun,&Wei, HaiCheng.(2018).Abnormal Rb Sr ratio in lacustrine sediments of Qaidam Basin, NE QinghaieTibetan Plateau A significant role of aeolian dust input.QUATERNARY INTERNATIONAL,469,44-57.
MLA	An, FuYuan,et al."Abnormal Rb Sr ratio in lacustrine sediments of Qaidam Basin, NE QinghaieTibetan Plateau A significant role of aeolian dust input".QUATERNARY INTERNATIONAL 469(2018):44-57.