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- Title
Leachate Lithium Characteristics of Loess‐paleosol Sequences on the Chinese Loess Plateau and their Paleoclimatic Significance.
- Authors
JIA, Peng; FU, Chaofeng; HE, Maoyong; LIU, Junfeng; LIU, Na; LI, Yulong; YANG, Kaiyuan
- 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.
- Subjects
LEACHATE; LOESS; SOIL formation; CLAY minerals; MAGNETIC measurements; STALACTITES &; stalagmites; LITHIUM; MONSOONS
- Publication
Acta Geologica Sinica (English Edition), 2023, Vol 97, Issue 6, p1814
- ISSN
1000-9515
- Publication type
Article
- DOI
10.1111/1755-6724.15086