河南省泌阳凹陷地下碱卤地球化学及其成因

GEOCHEMISTRY AND ORIGIN OF UNDERGROUND ALKALINE BRINE IN BIYANG DEPRESSION,HENAN

泌阳凹陷的水是地下碱卤水,其地层层位为始新统核桃园组。本文对卤水的地球化学及其成因进行了研讨。研究表明,卤水的主要化学成分是Na^+、Co和HCO^-_3,并富含氟、硼等微量元素。卤水属于Na_2Co_3—NaHCO_3—H_2O体系,一个大气压、25℃条件下的蒸发实验表明,整个蒸发浓缩过程析出的盐类矿物只有泡碱,碳氢钠石和天然碱,说明卤水成分简单。在干涸固相中出现了卤钠石,钾石盐等盐类矿物。根据卤水物质成分及微量元素的研究.我们认为卤水为次生成因。

The brine in Biyang depression is a underground alkaline brine. Its st ratigraphic location is Eocene Helaoyuan group . This paper researchs geochemistry and origin of brine.The research shows main composition of brine is Na^+, HCO_3,CO_3^(2-) and the brine is rich in minor elements of flourite , and boron etc.The brine belong to the systrm Na_2 CO_3 -NaHCO_3-H_2O.Under the conditions of 1 atm. pressure and 25℃、 evaporating experiment of brine has proved that separating out salt minerals are only natron ,wegschei derite and trona in all concentrated process. It makes clear that composition of brine is a simple.Salt minerals of sulfohalite sylvite and the like. are crystallized in extinct solid phase.Accouding to research in material component and minor elements elments of brine, we consider that brine in Biyang deression is a secondary origin.