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- W2377287462 abstract "The surface sediment samples from Dumeng sandy land were collected and divided into different grain size fractions(bulk sample,63 μm,63-30 μm,30-11 μm and 11 μm).These samples were analyzed in the laboratory to obtain composition of geochemical elements.The result shows that Si and Al take up a large part of chemical composition of surface sediment in Dumeng sandy land.Compared with the average composition of geochemical elements in the upper continental crust(UCC),Fe,Mg and Ca are depleted to a severe degree,Al and Na are depleted to a medium degree,and K are depleted slightly;Fe,Mg,Ca,P,Ti and Mn contents have high coefficients of variation;The variation degrees of major elements in different grain size fractions increase in the following order: AlSiNaKPFeTi(Ca,Mn)Mg,and variation of Al element is relatively slight.The volumes of Fe,Mg,Ca,Mn,Ti and P elements gradually increase with decreasing grain size,while the volumes of Si,Na and K are exactly the opposite,and the relationship between Al element and grain size is not significant.The influence of grain size on chemical weathering index is ranked in the following order: CIA(Al+Fe+Ti+Mn)/(Mg+Ca+K+Na)(CaO+K2O+Na2O)/Al2O3Fe2O3/MgOK2O/Al2O3(CaO+MgO+Na2O)/TiO2.CIA is the best index reflecting chemical weathering degree,and next are(Al+Fe+Ti+Mn)/(Mg+Ca+K+Na) and(CaO+K2O+Na2O)/Al2O3,followed by Fe2O3/MgO and K2O/Al2O3,and(CaO+MgO+Na2O)/TiO2 ratio is greatly influenced by grain size,so it isn't a good index of chemical weathering degree of sediments.The CIA value of Dumeng sandy land is 52.28,A-CN-K ternary diagram shows that these sediments are in the early stage of continental chemical weathering characterized by slight loss of Na and K,and other geochemical elements are in a less weathering or leaching process.A-CNK-FM ternary diagram suggests that Fe and Mg only have undergone slight chemical differentiation because of weak physical weathering and chemical weathering under the condition of semi-arid and semi-humid climatic.In addition,short transport distance of sediments in Dumeng sandy land makes Fe and Mg differentiation not obvious." @default.
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- W2377287462 date "2012-05-21" @default.
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- W2377287462 title "Geochemical Composition and Weathering Feature of Surface Sediment in the Dumeng Sandy Land,Northeast China" @default.
- W2377287462 doi "https://doi.org/10.7522/j.issn.1000-694x.2013.00143" @default.
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