An analysis of dynamic changes in hydrochemistry of lake brine and its influencing factors in the mining area of the Xitaijinair salt lake
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摘要: 每年冰雪融水期(3～4月)和洪水期(7～8月),西台吉乃尔盐湖(以下简称西台湖)矿区湖水中各主要化学组分明显降低,其他月份则表现为明显的高值。湖水水化学组成的投影点在相图上主要集中在白钠镁矾、软钾镁矾及泻利盐共结点及其附近区域,但西台湖的析盐程度要高于苦水沟一带的新湖泊。冬季湖水的投影点明显较夏季更接近光卤石相区,并且已经达到了钾石盐析出阶段。不同时期矿区湖水化学成分对比分析表明湖水水化学组分的变化仍主要受地表径流季节变化的控制,但人为因素对其影响正逐渐增强。Abstract: During snow-melting（from March to April）and flooding（from July to August）in each year,the contents of main chemical components of lake brines in the mining area of the Xitaijinair salt lake are obviously lower than those in other months.The projected points of lake brines in binary system metastable phase diagram of Na+,K+,Mg 2+ /Cl-,SO 2-4-H2O are mainly around the invariant point of astrakhanite,schoenite and epsomite.But the salting-out degree in the Xitaijinair lake is higher than that in the new lake which occurs around the Kushuigou area.The projected points of lake brines in winter obviously are closer to the carnallite area in the phase diagram than those in summer,and the former has reached the stage of precipitation of sylvite.Analyses of chemical components of lake brines in the mining area in different time（in 2001 and from 2003 to 2005）show that the changes in chemical components in lake brines are still mainly controlled by seasonal change in surficial runoff,and at the same time the influence of human being on these changes is gradually increasing.
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Key words:
- Xitaijinair salt lake /
- hydrochemistry /
- brine /
- dynamic changes /
- influencing factors
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