Elemental Variations and Mechanisms of Brines in the Context of Large-Scale Exploitation: A Case Study of Xitaijnar Salt Lake, Qaidam Basin

IF 1.7 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Zhanjie Qin, Qingkuan Li, Wenxia Li, Qishun Fan, Tianyuan Chen, Chan Wu, Jianping Wang, Fashou Shan
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Abstract

There is limited research on the variations in brine element changes and the factors that influence them during large-scale exploitation. The Xitaijnar Salt Lake in the Qaidam Basin is a large brine lithium deposit. In this study, we investigated the variations in chemical composition and the factors that influence intercrystalline brine at different time periods. Hydrochemistry, mineralogy, and hydrogeochemical simulation methods were employed to understand the brine evolution. Our results indicate that after nearly 20 years of exploitation, the intercrystalline brine still belongs to the magnesium sulfate subtype, with only slight variations in salinity. The concentrations of Na, K, and SO4 showed a slight increase, while the content of Mg and Cl decreased slightly. The concentrations of B and Li exhibited minor fluctuations. The provenance, water level, and hydraulic connection had minimal influence on the chemical composition of the intercrystalline brine. By contrast, the dynamic dissolution and precipitation of sulfate minerals and halite, as well as drastic changes in hydrological conditions (such as floods), were identified as the main factors affecting the chemical composition of brine. With the large-scale extraction of intercrystalline brine, the content of elements in the salt lake showed a decreasing trend. This can be attributed to the fact that intercrystalline brine is formed through long-term evaporation and concentration. Therefore, during the exploitation process, it is crucial to monitor the hydrochemical variations of intercrystalline brine and understand the controlling factors. The results of this study may prove useful for the sustainable development and utilization of salt lake resources worldwide.

Abstract Image

大规模开采背景下卤水的元素变化和机制:柴达木盆地西台吉纳尔盐湖案例研究
关于大规模开采过程中卤水元素变化及其影响因素的研究十分有限。柴达木盆地的西台吉纳尔盐湖是一个大型卤水锂矿床。在这项研究中,我们调查了不同时期晶间卤水化学成分的变化及其影响因素。我们采用了水化学、矿物学和水文地质化学模拟方法来了解卤水的演变过程。结果表明,经过近 20 年的开采,晶间卤水仍属于硫酸镁亚型,盐度仅有轻微变化。Na、K和SO4的浓度略有上升,而Mg和Cl的含量则略有下降。B 和 Li 的浓度略有波动。出处、水位和水力联系对晶间盐水化学成分的影响微乎其微。相比之下,硫酸盐矿物和海绿石的动态溶解和沉淀以及水文条件的急剧变化(如洪水)被认为是影响卤水化学成分的主要因素。随着晶间卤水的大规模开采,盐湖中的元素含量呈下降趋势。这可能是由于晶间卤水是通过长期蒸发和浓缩形成的。因此,在开采过程中,监测晶间卤水的水化学变化并了解其控制因素至关重要。本研究的结果可能对全球盐湖资源的可持续开发和利用有所帮助。
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来源期刊
Aquatic Geochemistry
Aquatic Geochemistry 地学-地球化学与地球物理
CiteScore
4.30
自引率
0.00%
发文量
6
审稿时长
1 months
期刊介绍: We publish original studies relating to the geochemistry of natural waters and their interactions with rocks and minerals under near Earth-surface conditions. Coverage includes theoretical, experimental, and modeling papers dealing with this subject area, as well as papers presenting observations of natural systems that stress major processes. The journal also presents `letter''-type papers for rapid publication and a limited number of review-type papers on topics of particularly broad interest or current major controversy.
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