柴达木盆地中部高Mg/Li盐湖卤水富镁物源探讨
Discussion on Magnesium-rich Sources of Salt Lakes with High Mg/Li ratio in the Middle of Qaidam Basin
投稿时间:2018-11-20  修订日期:2018-12-25
DOI:
中文关键词:  物源  卤水富镁  柴达木盆地中部盐湖  水化学特征  含镁矿物
英文关键词:Source  Magnesium-rich brine  Salt lake in middle Qaidam Basin  Water chemistry characteristics  Minerals contained magnesium.
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
陈帅 中国科学院青海盐湖研究所 810008
樊启顺 中国科学院青海盐湖研究所 810008
秦占杰 中国科学院青海盐湖研究所 
张湘如 中国科学院青海盐湖研究所 
山俊杰 中国科学院青海盐湖研究所 
李庆宽 中国科学院青海盐湖研究所 
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中文摘要:
      为了查清那棱格勒河尾闾盐湖—一里坪、西台、东台和察尔汗盐湖别勒滩区段高Mg/Li卤水富镁的主控因素及成因,作者系统采集了柴达木盆地那棱格勒河水、流域围岩和尾闾盐湖卤水样品,进行水样、岩样元素含量及矿物组合分析。结果表明,河水阳阴离子含量特征为Na+>Ca2+>Mg2+和Cl->HCO3->SO42-;与河水相比,卤水Ca2+和HCO3-含量降低,Na+、K+、Cl-和SO42-明显富集,二者具有相似的Mg2+离子百分比含量(~25%);与南海海水和青海湖湖水蒸发曲线对比,卤水的镁含量落在曲线上,说明卤水富镁是由河水输入、蒸发浓缩控制的,而非盆地古湖自西向东浓缩迁移的结果;通过那陵格勒河流域围岩矿物和镁含量分析,发现河水流经的围岩中沉积有含镁矿物(白云石、含镁方解石和阳起石),且镁含量高达0.6-11.5%,说明高镁的岩石风化溶滤是引起尾闾盐湖卤水富镁的主因。
英文摘要:
      In order to find out the main controlling factors of magnesium-rich in the terminal salt lakes (Yiliping, Xitaijinar, Dongtaijinar, Bieletan section in Qarhan Salt Lake) of Nalenggele River with high Mg/Li ratios, the authors systematically collected river water, brine and surrounding rock samples from Nalenggele River in middle Qaidam Basin, and analyzed element content of water and rock samples, and mineral assemblages of rock samples. The results showed that the contents of anion and cation in river water was characterized by Na+>Ca2+>Mg2+ and Cl->HCO3->SO42-; Compared with river water, Ca2+ and HCO3- concentrations in brine decreased, and Na+, K+, Cl-and SO42- concentrations were obviously enriched, both of river water and brine had similar percentage of Mg2+(~25%); Compared with the evaporation curves of waters from South China Sea and Qinghai Lake, the magnesium content in brine was plotted around both of two curves and the lithium content was far away from both of two curves, which indicate that magnesium and lithium in brine have different origins and the enriched magnesium is formed by river water input and evaporation concentration. This conclusion is inconsistent with that the high magnesium content in salt lakes in the middle part of the basin is not the result of the long-term evolution of ancient lakes in the basin from west to east. Magnesium-bearing minerals (dolomite, magnesia-bearing calcite and actinolite) are present in the surrounding rocks, and the content of magnesium is as high as 0.6-11.5%. The weathering and leaching of high-magnesium minerals may account for magnesium-rich brine in terminal salt lakes of Nalenggele River.
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