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A Rb/Sr record of the weathering response to environmental changes in westerly winds across the Tarim Basin in the late Miocene to the early Pleistocene
Chang, H (Chang, Hong)[ 1 ]; An, ZS (An, Zhisheng)[ 1 ]; Wu, F (Wu, Feng)[ 1 ]; Jin, ZD (Jin, Zhangdong)[ 1 ]; Liu, WG (Liu, Weiguo)[ 1 ]; Song, YG (Song, Yougui)[ 1 ]
2013-09-15
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
Volume386Pages:364-373
Subtype期刊论文
Abstract

The long-term record of lacustrine deposits in the Tarim Basin seems to provide a record of climate influenced by westerly winds. To characterize the evolution of westerly winds, we analyzed concentrations of Rb, V, Zn, Sc and Sr for the drill core Ls2 from Lop Nor in the eastern Tarim Basin. The Rb/Sr ratio in lacustrine deposits depends primarily on the Sr element activity during weathering, after the influence of source provenance has been removed. We assume that with such a correction, the Rb/Sr ratio is controlled by precipitation, which depends on moisture transport by westerly winds to the Tarim Basin. The Rb/Sr ratio displays a large-amplitude oscillation that generally follows a pattern similar to that of pollen and ostracod assemblages, which support the inference that rainfall amount affects the Rb/Sr ratio, and in turn suggests that it may serve as an index of precipitation that was transported by westerly wind. All these climatic proxies obviously changed since the late Miocene, suggesting stronger aridification that may be attributed to a latitudinal shift in westerly winds since the late Miocene. A southward migration of westerly winds, which then transported more moisture to the southern and eastern parts of the Tibetan Plateau, agrees with modeling results and the geological record during that time. This event may be causally related to the expansion of the northern hemisphere ice and/or regional tectonic uplift of high mountains around the Tarim Basin.

KeywordRb/sr Ratio Weathering Environmental Change The Tarim Basin Westerly Wind The Late Miocene To The Early pleisTocene Expansion Of The North Hemisphere Ice Volume Tectonic Uplift
DOI10.1016/j.palaeo.2013.06.006
Indexed BySCI
Language英语
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9897
Collection古环境研究室
Corresponding AuthorChang, H (Chang, Hong)[ 1 ]
AffiliationState Key Laboratory of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
Recommended Citation
GB/T 7714
Chang, H ,An, ZS ,Wu, F ,et al. A Rb/Sr record of the weathering response to environmental changes in westerly winds across the Tarim Basin in the late Miocene to the early Pleistocene[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2013,386:364-373.
APA Chang, H ,An, ZS ,Wu, F ,Jin, ZD ,Liu, WG ,&Song, YG .(2013).A Rb/Sr record of the weathering response to environmental changes in westerly winds across the Tarim Basin in the late Miocene to the early Pleistocene.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,386,364-373.
MLA Chang, H ,et al."A Rb/Sr record of the weathering response to environmental changes in westerly winds across the Tarim Basin in the late Miocene to the early Pleistocene".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 386(2013):364-373.
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