Arid
DOI10.1016/j.epsl.2017.06.039
The geochemistry of Don Juan Pond: Evidence for a deep groundwater flow system in Wright Valley, Antarctica
Toner, J. D.; Catling, D. C.; Sletten, R. S.
通讯作者Toner, J. D.
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
EISSN1385-013X
出版年2017
卷号474页码:190-197
英文摘要

Don Juan Pond (DJP), Antarctica, is one of the most unusual surface waters on Earth because of its CaCl2-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 CaCl2-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 Mg2+ 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. (C) 2017 Elsevier B.V. All rights reserved.


英文关键词Don Juan Pond Antarctic Dry Valleys calcium chloride groundwater geochemical modeling Mars
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000409150600021
WOS关键词MCMURDO DRY VALLEYS ; RECURRING SLOPE LINEAE ; CHEMICAL-EQUILIBRIUM ; MINERAL SOLUBILITIES ; BEHAVIOR ; WATERS ; MODEL ; BRINE ; WARM ; LIFE
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198339
作者单位Univ Washington, Dept Earth & Space Sci, Box 351310, Seattle, WA 98195 USA
推荐引用方式
GB/T 7714
Toner, J. D.,Catling, D. C.,Sletten, R. S.. The geochemistry of Don Juan Pond: Evidence for a deep groundwater flow system in Wright Valley, Antarctica[J],2017,474:190-197.
APA Toner, J. D.,Catling, D. C.,&Sletten, R. S..(2017).The geochemistry of Don Juan Pond: Evidence for a deep groundwater flow system in Wright Valley, Antarctica.EARTH AND PLANETARY SCIENCE LETTERS,474,190-197.
MLA Toner, J. D.,et al."The geochemistry of Don Juan Pond: Evidence for a deep groundwater flow system in Wright Valley, Antarctica".EARTH AND PLANETARY SCIENCE LETTERS 474(2017):190-197.
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