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1、2015年9月,第21卷,第3期,553-558页高校地质学报September2015,Vol.21,No.3,pp.553-558GeologicalJournalofChinaUniversitiesDOI:10.16108/j.issn1006-7493.2015017江西赣县花岗岩型红土剖面常量元素地球化学特征熊平生衡阳师范学院城市与旅游学院,衡阳421002摘要:对赣县田村花岗岩红色风化壳剖面常量元素的迁移特征和化学风化强度的研究结果表明:(1)红土常量元素组成以SiO2、Al2O3、Fe2
2、O3为主,三者占总量的90%以上,其中又以SiO2的含量最高,K2O、CaO、Na2O与MgO等易溶组分的含量则相对较低;(2)红土剖面风化过程中,常量元素的地球化学行为多表现为迁移淋失,迁移程度由剖面底部向上逐渐增强,其中CaO与Na2O平均迁移量分别为97.34%、94.94%,属于强迁移元素;MgO、K2O和SiO2平均迁移量分别为52.50%、39.89%、22.72%,属于易迁移元素,Fe元素表现为高度富集;(3)综合分析铝铁系数、化学蚀变指数和风化淋溶系数,指示赣县花岗岩型红土在炎热、潮湿环
3、境下遭受了强烈的化学风化作用,风化强度顶部向下渐弱。关键词:花岗岩型红土;化学风化强度;元素迁移;田村剖面中图分类号:P595文献标识码:A文章编号:1006-7493(2015)03-0553-06MajorElementsGeochemicalCharacteristicsoftheGranite-typeLateriteProfileinGanXian,JiangxiProvinceXIONGPingshengCollegeofCityandTourism,HengyangNormalUniver
4、sity,Hengyang421002,ChinaAbstract:ThechemicalweatheringintensityandelementmigrationfeaturesoftheGranite-typeLateriteProfileinTiancun,Ganxianarestudiedinthispaper.Theresultsindicatethat:(1)ThelateriteismainlycomposedofSiO2,Al2O3,Fe2O3,whichaccountforover9
5、0%ofthetotalandtheSiO2isthehighest.ThecontentofsolubleconstituentssuchasK2O,CaO,Na2O,MgO,arerelativelylower.(2)MajorelementgeochemistrybehaviorpresentthemigrationleachingduringtheprocessofweatheringintheGranite-typeLateriteProfileandthedegreeofmigrationi
6、sstrengthenedgraduallyfromthebottomtothetop.CaO,Na2Omigrationamountare97.34%,94.94%onaverage,respectively,andbelongtothestrongmigrationelements;MgO,K2O,SiO2averagemigrationquantityare52.50%,39.89%and22.72%,respectively,belongtotheeasytransitionelement,th
7、eelementcharacterizedbyhighconcentrationwasFe.(3)WefoundtheGranite-typeLateriteProfilesufferedstrongchemicalweatheringinhotandhumidenvironmentinGanxianandtheweatheringintensitybecamegraduallyweakformthetoptothebottom,onthebasisofthecomprehensiveanalysiso
8、fthecoefficientofaluminumandiron,chemicalalterationandweatheredeluvial.Keywords:Granite-typeLateriteProfile;chemicalweatheringintensity;elementmigration;TiancunsectionFristauthor:XIONGPingsheng,AssociateProfessor;E-mail:xp