干旱区生态环境知识资源中心(Arid): Hydrogeologic and Geochemical Distinctions in Freshwater-Brine Systems of an Andean Salar

Arid

DOI	10.1029/2020GC009345
	Hydrogeologic and Geochemical Distinctions in Freshwater-Brine Systems of an Andean Salar
	Munk, L. A.; Boutt, D. F.; Moran, B. J.; McKnight, S., V; Jenckes, J.
通讯作者	Munk, LA (corresponding author), Univ Alaska Anchorage, Dept Geol Sci, Anchorage, AK 99508 USA.
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
EISSN	1525-2027
出版年	2021
卷号	22 期号:3
英文摘要	The Salar de Atacama contains one of the world's most important lithium resources and hosts unique and fragile desert ecosystems. Water use issues of the hyper-arid region have placed it at the center of global attention. This work combines geochemical and hydrogeologic data with remote sensing analysis to address differences in water zones in the marginal environments of the salar. Water samples from across the inflow to brine transition were collected over the period 2012-2016 and analyzed for D, H-3, Sr-87/Sr-86 and major and minor elements. The D values range from about -64 parts per thousand to +20 parts per thousand, H-3 as R-mod from 0.01 to 0.36 and the Sr-87/Sr-86 from 0.70750 to 0.70804 with highest D and H-3 occurring in the regions of open water. Geochemical modeling results indicate inflow and shallow transition zone waters are saturated with respect to calcite, whereas all others are saturated with respect to calcite, gypsum, and halite. Long-term remote-sensing of surface water body extents indicate that extreme precipitation events are the primary driver of surface area changes as exemplified by an increase in size of the lagoons by a factor of 2.7 after a storm. A new conceptual model of the freshwater to brine transition zone that incorporates variability in aquifer geology, hydrology and geochemistry to explain important marginal water bodies is presented. The subsurface brines in the transition zone and the halite nucleus are geochemically distinct compared to the groundwater discharge features (e.g., lagoons) over modern time scales which aids in conceptualizing the transition zone system.
英文关键词	Atacama brine lagoons lithium salar transition zone
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000636360200039
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/2XILL650/350367
作者单位	[Munk, L. A.; Jenckes, J.] Univ Alaska Anchorage, Dept Geol Sci, Anchorage, AK 99508 USA; [Boutt, D. F.; Moran, B. J.; McKnight, S., V] Univ Massachusetts, Dept Geosci, Amherst, MA 01003 USA
推荐引用方式 GB/T 7714	Munk, L. A.,Boutt, D. F.,Moran, B. J.,et al. Hydrogeologic and Geochemical Distinctions in Freshwater-Brine Systems of an Andean Salar[J],2021,22(3).
APA	Munk, L. A.,Boutt, D. F.,Moran, B. J.,McKnight, S., V,&Jenckes, J..(2021).Hydrogeologic and Geochemical Distinctions in Freshwater-Brine Systems of an Andean Salar.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,22(3).
MLA	Munk, L. A.,et al."Hydrogeologic and Geochemical Distinctions in Freshwater-Brine Systems of an Andean Salar".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 22.3(2021).