The geochemistry of Don Juan Pond: Evidence for a deep groundwater flow system in Wright Valley, Antarctica
The geochemistry of Don Juan Pond: Evidence for a deep groundwater flow system in Wright Valley, Antarctica
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唐璜池的地球化学：南极洲莱特谷深层地下水流动系统的证据
DOI：
10.1016/j.epsl.2017.06.039
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发表时间：
2017
影响因子：
5.3
通讯作者：
Sletten, R.S.
中科院分区：
文献类型：
--
作者：
Toner, J.D.;Catling, D.C.;Sletten, R.S.
摘要南极唐璜池是地球上最不寻常的表层沃茨之一，它富含CaCl 2。为了研究封闭盆地蒸发过程中池塘沃茨的演变，并了解负责DJP化学的盐水的来源，我们应用一个新开发的低温水模型在Na-K-Ca-Mg-Cl系统中的DJP。通过模拟DJP的闭盆蒸发，并比较DJP地表水，深层地下水，浅层地下水和其他地表化学之间的离子比在赖特山谷，我们发现，DJP是最好的解释上升的深层地下水，而不是最近提出的假设浅层地下水源。在我们的模型中，早期封闭盆地的卤水演化准确地预测了在DJP中观察到的化学成分;然而，后期封闭盆地蒸发产生的富镁钾卤水和盐与DJP中富氯化钙卤水不匹配。根据地下水流入DJP的速度，我们估计，即使是最集中的盐水在DJP经历了封闭的盆地蒸发不到一年。为了解释所观察到的缺乏Mg 2+和K+积累在DJP随着时间的推移，和令人惊讶的年轻年龄的盐水，我们推断，DJP是一个局部的上升流从区域地下水流过系统中，蒸发的DJP盐水循环回地下超过每年的时间尺度。DJP下方区域地下水流系统的存在对寒冷沙漠生态系统中的水和溶质预算有影响，并可能为火星上地下水和水流的形成提供线索。
Abstract Don Juan Pond (DJP), Antarctica, is one of the most unusual surface waters on Earth because of its CaCl 2-rich composition. To investigate the evolution of pond waters during closed-basin evaporation and to understand the source of brines responsible for the chemistry of DJP, we apply a newly developed low-temperature aqueous model in the Na–K–Ca–Mg–Cl system to DJP. By modeling the closed-basin evaporation of DJP and comparing ionic ratios between DJP surface water, deep groundwater, shallow groundwater, and other surface chemistries in Wright Valley, we find that DJP is best explained by upwelling deep groundwater, as opposed to recent hypotheses proposing shallow groundwater sources. The early closed-basin evolution of brines in our model accurately predicts observed chemistries in DJP; however, late-stage closed-basin evaporation produces Mg–K-rich brines and salts that do not match the CaCl 2-rich brine in DJP. Based on groundwater inflow rates to DJP, we estimate that even the most concentrated brines in DJP have undergone closed-basin evaporation for less than a year. To explain the observed lack of Mg 2+ and K+ accumulation in DJP over time, and the surprisingly young age for the brines, we deduce that DJP is a localized upwelling from a regional groundwater flow-through system in which evaporated DJP brines are recycled back into the subsurface over yearly timescales. The existence of a regional groundwater flow system beneath DJP has implications for water and solute budgets in cold desert ecosystems, and may provide clues for the formation of groundwater and aqueous flows on Mars.
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影响因子：
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