Variation of Li isotope and major & trace element ratios from the top of the Xiamaling to the Longshan formations at the Liangjiazhuang section at Huailai County, Hebei Province. (IMAGE)
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The ratios of major and trace elements of siliceous sediments that have significant response to geological characteristics such as provenance, continental weathering degree, paleoclimate, redox environment, such as Al2O3, Na2O/Al2O3, Sr/Ba, Rb/Sr, FeO/Fe2O3, as well as the CIA, chemical index of weathering (CIW), and plagioclase alteration index (PIA) were selected. Li isotope, Li and geochemical indices content indicate that chemical weathering of the transition between the Xiamaling Formation and the Longshan Formation weakened, and no weathering crust existence.
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