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Weathering Intensity of the TSG Holocene Loess-paleosol Sequence and Its Significance

Yanhua Li

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Abstract

A Holocene loess-paleosol sequence was found at Tian-shui-gou(TSG) site,Dali.A detailed study on contrast the contents of major elements,magnetic susceptibility and Rb/Sr ratio was conducted in this paper to explore the environmental features in the Holocene.The analytical results show that Ca,Mg and Na are leached,Si and K are relatively enriched,but the transport phenomenon of Fe is not obvious.The distributions of magnetic susceptibility,Rb/Sr ratio,SiO2/(Al2O3+Fe2O3),SiO2/(MgO+CaO) and(CaO+K2O+Na2O)/Al2O3 imply that during the paleosol(S0) formation,chemical weathering was stronge,and the climate was warm and humid,while during the stage of loess(L0,Lt) accumulation,weathering intensity was weakened,and the climate turned to be relatively dry.There would be a climate change in the late Holocene.

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What this paper is about

A Holocene loess-paleosol sequence was found at Tian-shui-gou(TSG) site,Dali.A detailed study on contrast the contents of major elements,magnetic susceptibility and Rb/Sr ratio was conducted in this paper to explore the environmental features in the Holocene.The analytical results show that Ca,Mg and Na are leached,Si and K are relatively enriched,but the transport phenomenon of Fe is not obvious.The distributions of magnetic susceptibility,Rb/Sr ratio,SiO2/(Al2O3+Fe2O3),SiO2/(MgO+CaO) and(CaO+K2O+Na2O)/Al2O3 imply that during the paleosol(S0) formation,chemical weathering was stronge,and the climate was warm and humid,while during the stage of loess(L0,Lt) accumulation,weathering intensity was weakened,and the climate turned to be relatively dry.There would be a climate change in the late Holocene.

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Available abstract

A Holocene loess-paleosol sequence was found at Tian-shui-gou(TSG) site,Dali.A detailed study on contrast the contents of major elements,magnetic susceptibility and Rb/Sr ratio was conducted in this paper to explore the environmental features in the Holocene.The analytical results show that Ca,Mg and Na are leached,Si and K are relatively enriched,but the transport phenomenon of Fe is not obvious.The distributions of magnetic susceptibility,Rb/Sr ratio,SiO2/(Al2O3+Fe2O3),SiO2/(MgO+CaO) and(CaO+K2O+Na2O)/Al2O3 imply that during the paleosol(S0) formation,chemical weathering was stronge,and the climate was warm and humid,while during the stage of loess(L0,Lt) accumulation,weathering intensity was weakened,and the climate turned to be relatively dry.There would be a climate change in the late Holocene.

Key concepts: Loess, Paleosol, Weathering, Holocene, Geology, Sequence (biology), Physical geography, Geochemistry

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