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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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Science China Earth Sciences 2021年第1期64卷 80-95页

作者： Hanfei YANG Yan ZHAO Qiaoyu CUI Weihe REN Quan LI Key Laboratory of L and Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049 China

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 ***,some factors could affect rb/sr ratios,causing misinterpretation and limiting its *** 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 *** validate its application,we correlated this record with the chemical index of alteration(CIA)and other paleoclimatic *** 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 corescanned 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 corescanned rb/sr ratios at core depths of 25–0.3 and 56–47 m were unable to reliably reflect chemical weathering intensity due to both the grain-size effect and the low test *** study highlights the need for mutual verification of multiple indicators before accurately applying rb/sr as a paleoclimatic proxy in other similar study areas.

关键词： rb/sr ratios XRF core scanning Lake sediment Tibetan Plateau Paleoclimatic indication

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rb and sr Geochemical Characterization of the Chinese Loess Stratigraphy and Its Implications for Palaeomonsoon Climate

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Acta Geologica Sinica(English Edition) 2000年第2期74卷 279-288页

作者： CHEN Jun WANG Yongjin CHEN Yang LIU Lianwen JI Junfeng LU Huayu Department of Earth Sciences Nanjing UniversityNanjing 210093 Department of Geography Nanjing Normal UniversityNanjing 210097 Department of Earth Sciences Nanjing UniversityNanjing 210093 Xi’an State Key Laboratory of Loess and Quaternary Geology Chinese Academy of SciencesXi’an 710061

Concentrations and distributions of rb and sr in loess and palaeosol samples from the Luochuan profile have been studied, in grain-size fractions and chemical forms. Results show that rb is quite rich in the fraction of less than 2 μm, and exits only in the residual phase, while sr is distributed in sand and silt fractions, occurring in the residual and carbonate phases. Therefore, variations of the concentrations of rb and sr in loess and palaeosols are closely related not only to dustfall compositions depending on winter monsoon wind strength but also to summer monsoon-induced pedogenic intensity. This indicates that variations of rb/sr ratio in Chinese loess sequences represent cyclic alternations of East Asian summer and winter monsoon climates on the orbital time-scale. Variations in sr concentrations along the sequence bear a high similarity to the oxygen isotope record of the deep sea sediments over the past 2.5 Ma, whereas variations in rb concentrations are in good agreement with the record of magnetic susceptibility determined with the duplicated samples from the same profile. This suggests that (1) the high-latitude ice volume is responsible for East Asian monsoon variations and (2) the signal of magnetic susceptibility depends dominantly on pedogenesis in Chinese loess sequences.

关键词： rb and sr geochemical characterization rb/sr ratios loess sequence palaeomonsoon climate Loess Plateau

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