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Geochemical Behavior of Acid Soluble and Insoluble Fractions and Their Application to Paleoenvironment Reconstruction of Lacustrine Sediment
详细信息   
摘要
The chemical elements of lacustrine sediments were sensitive to climatic change.Based on the measurement of major elements(K,Ca,Na,Mg,Ti,Fe,Mn and Al) of acid soluble(AS) and acid insoluble(AI) fractions of the Shell Bar Section from Qaidam Basin in NE Tibetan Plateau,the correlations of major elements with mineral assemblages,grain-size,content of carbonate and 87Sr/86Sr value were discussed.There was a strong correlation between major elements and minerals.Element Concentration of AS fraction shows larger various than AI fraction,indicating different response with environment change to AI and AS fractions.Elements Al and Fe concentration of AI fraction have a negative correlation with quartz and a positive correlation with clay mineral,indicating the weathering information in basin was recorded by AI fraction.The total concentration of AS fraction was lower and had a strong correlation with carbonate concentration,indicating the AS fraction was authigene in lake system.The correlations of Mg/Ca ratio in AS fraction with grain-size and87Sr/86Sr were analyzed,Mg/Ca in AS was influenced by Mg/Ca value of bedrock and failed to be used as index of salinity.Using detrending method,Mg/Ca in AS by recalculated showed strong correlation with grain-size and 87Sr/86Sr.So Mg/Ca was a reliable index of salinity in lake system.The chemical element analysis of AS and AI fractions was useful to extract and understand the climate signal recorded by lake sediment.

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