吉林东部花岗岩区地下水化学成分及其对岩石风化作用的制约

在吉林东部花岗岩区地下水化学成分和化学类型研究的基础上,以Na作为参比元素,确定了花岗岩风化过程中22种主量元素和微量元素的相对活动顺序。花岗岩区地下水的地球化学类型属低矿化度(变化范围为69.51×10-6~386.49×10-6,平均值为199.48×10-6)的HCO3-Ca和HCO3-Na-Ca型。花岗岩风化过程中元素的活动性顺序(RM)从大到小依次为:B、Ca、Mo、Zn、Sr、Na、Mg、Cr、Cu、Ni、K、Co、Li、V、As、Ba、Si、Y、Fe、Ti、Al、Mn。风化产物中的粘土矿物主要为高岭土、蒙脱石,反映出本区花岗岩的风化淋滤程度较弱的特点。

Chemical Composition of Groundwater from Granitic Areas and Its Constraints to the Granite Weathering in the Eastern of Jilin

Based on research of chemical composition and geochemical types of groundwater from granitic areas in the eastern Jilin Province,the relative mobility of twenty-two major and trace elements during granite weathering has been investigated using sodium as the referenced elements.The geochemical types of groundwater from granitic areas belong to HCO3-Ca type and HCO3-NaCa type with low total dissolved solid(TDS).The relative mobility sequences of major and trace elements from most to least are B,Ca,Mo,Zn,Sr,Na Mg,Cr,Cu,Ni,K,Co,Li,V,As,Ba,Si,Y,Fe,Ti,Al,Mn.In the weathered products clay minerals are mainly kaolinite and smectite,which reflects that the weathering and leaching of granites in the research areas is comparatively low.