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

被引：24
作者：
An, FuYuan [1 ,2 ]
Lai, ZhongPing [3 ]
Liu, XiangJun [1 ]
Fan, QiShun [1 ]
Wei, HaiCheng [1 ]
机构：
[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Salt Lake Geol & Environm Qinghai Prov, Xining 810008, Peoples R China
[2] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Cryosphere Sci, Lanzhou 730000, Gansu, Peoples R China
[3] China Univ Geosci, Sch Earth Sci, Wuhan 430074, Hubei, Peoples R China
来源：
QUATERNARY INTERNATIONAL | 2018年 / 469卷
基金：
中国科学院西部之光基金;
关键词：
Aeolian materials input; Lacustrine sediments; Rb/Sr ratio; Qaidam Basin; Qinghaiei-Tibetan Plateau; QINGHAI-TIBETAN PLATEAU; CHINESE LOESS PLATEAU; HOLOCENE EOLIAN ACTIVITY; QARHAN SALT LAKE; EAST-ASIAN DUST; CLIMATE-CHANGE; PALEOCLIMATIC IMPLICATIONS; WESTERN CHINA; GONGHE BASIN; PALEOENVIRONMENTAL IMPLICATIONS;
D O I：
10.1016/j.quaint.2016.12.050
中图分类号：
P9 [自然地理学];
学科分类号：
0705 ; 070501 ;
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.
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收藏
页码：44 / 57
页数：14
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