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We thank two anonymous reviewers for their detailed and constructive comments, the editors for their efficient handling of our manuscript, and Dr. Jan Bloemendal for polishing the language. This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 42272221, 41930863), the Fundamental Research Funds for the Central Universities (Grant No. 300102272901), the Foundation of the State Key Laboratory of Loess and Quaternary Geology (Institute of Earth and Environment, CAS) (SKLLQG1905, SKLLQGPY2006), and the Second Tibet Plateau Scientific Expedition and Research Program (STEP) (2019QZKK0704, 2019QZKK0101).

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    Abstract:

    The geochemical components of the leachate from loess-paleosol deposits can provide information about climate-related post-depositional processes. For example, leachate lithium ([Li]leachate) is a potential paleoclimate proxy because lithium is a typical lithophile element that is readily adsorbed by clay minerals during weathering and pedogenesis, and thus stratigraphic variations in [Li]leachate can reflect these processes. We investigated the [Li]leachate values of two loess-paleosols profiles (the Luochuan and Weinan sections), on a north–south climatic gradient on the Chinese Loess Plateau. Independent paleoclimate information was provided by measurements of magnetic susceptibility, grain size, Rb/Sr ratios, and clay mineral content. During the last glacial-interglacial period, [Li]leachate increased from 0.39 to 1.97 μg/g at Luochuan and from 0.67 to 2.45 μg/g at Weinan, mainly due to increasing pedogenesis. Based on these results we developed a conceptual model to explain the variations in [Li]leachate. Li+ within loess layers is mainly derived from dust input and the decomposition of primary minerals, influenced by the East Asian winter monsoon, while in paleosol layers Li+ is mainly derived from clay mineral adsorption during pedogenic processes, influenced by the East Asian summer monsoon.

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JIA Peng, FU Chaofeng, HE Maoyong, LIU Junfeng, LIU Na, LI Yulong, YANG Kaiyuan.2023.[J]. Acta Geologica Sinica(),97(6):1814-1824

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History
  • Received:February 28,2023
  • Revised:May 30,2023
  • Online: December 25,2023
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