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Paleoclimatic indication of X-ray fluorescence core-scanned Rb/Sr ratios: A case study in the Zoige Basin in the eastern Tibetan Plateau

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Abstract

The X-ray fluorescence (XRF) core-scanned Rb/Sr ratios of lake sediments have been widely used as a proxy for chemical weathering intensity and past climate change. However, some factors could affect Rb/Sr ratios, causing misinterpretation and limiting its application. In this study, we present a high-resolution XRF core-scanned Rb/Sr record of core ZB13-C1 from the Zoige Basin in the eastern Tibetan Plateau. To validate its application, we correlated this record with the chemical index of alteration (CIA) and other paleoclimatic proxies. Our results showed that (1) the core-scanned Rb/Sr ratios and CIA were reliable proxies of chemical weathering intensity in fine-grained sedimentary sequences; (2) the low values of core-scanned Rb/Sr ratios and CIA were significantly correlated with high total organic carbon content, arboreal pollen content, carbonate content, and C/N ratios, confirming its reliability as a proxy for the Asian summer monsoon intensity; (3) the core-scanned Rb/Sr ratios at core depths of 25–0.3 and 56–17 m were unable to reliably reflect chemical weathering intensity due to both the grain-size effect and the low test accuracy. Our study highlights the need for mutual verification of multiple indicators before accurately applying Rb/Sr as a paleoclimatic proxy in other similar study areas.

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Acknowledgements

We acknowledge the two anonymous reviewers for their constructive comments and suggestions. We thank Bin HU, Dandan SUN, Xinhang WANG, Huiyang ZHOU, Chenhui HU, Liwen PENG, and Weiling ZU for their assistance in the laboratory. This work was supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA20070101), the National Natural Science Foundation of China (Grant Nos. 41690113 & 41888101), and the National Key Research and Development Program of China (Grant No. 2016YFA0600501).

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  1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China

    Hanfei Yang, Yan Zhao, Qiaoyu Cui, Weihe Ren & Quan Li

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Hanfei Yang, Yan Zhao & Weihe Ren

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Yang, H., Zhao, Y., Cui, Q. et al. Paleoclimatic indication of X-ray fluorescence core-scanned Rb/Sr ratios: A case study in the Zoige Basin in the eastern Tibetan Plateau. Sci. China Earth Sci. 64, 80–95 (2021). https://doi.org/10.1007/s11430-020-9667-7

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