干旱区生态环境知识资源中心(Arid): The origin of solutes in groundwater in a hyper-arid environment: A chemical and multi-isotope approach in the Atacama Desert, Chile

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DOI	10.1016/j.scitotenv.2019.06.356
	The origin of solutes in groundwater in a hyper-arid environment: A chemical and multi-isotope approach in the Atacama Desert, Chile
	Gamboa, Carolina 1; Godfrey, Linda 2; Herrera, Christian 1; Custodio, Emilio 3,4; Soler, Albert 5
通讯作者	Gamboa, Carolina
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	690 页码:329-351
英文摘要	The major ion and the multi-isotopic composition (Sr-87/Sr-86,delta B-11,delta S-34(SO4) and delta O-18(SO4)) of groundwater from the Central Depression in northern Chile is investigated to identify the origin of groundwater solutes in the hyper-arid core of the Atacama Desert. The study area is between the Cordillera de Domeyko and the Central Depression, at latitudes 24-25 degrees S, and is characterized by near-zero air moisture conditions, rare precipitation and very limited runoff. Groundwater composition varies from Ca-HCO3 to Ca, Na-SO4 type below elevations of 3400 m a.s.l. The rCl/rBr ratio of meteoric waters and groundwater overlap, but significantly increase in the aquifer as salinity goes up due to evapoconcentration far from the Domeyko Cordillera. The wind-displaced dust originating in the Central Depression (Sr-87/Sr-86: 0.706558-0.710645;delta S-34(SO4): 0 to +4%) affects the precipitation composition in the highest parts of the Domeyko Cordillera (Sr-87/Sr-86: 0.706746-0.709511; delta S-34(SO4): +1 to +6 parts per thousand), whose delta S-34(SO4) and delta B-11 values are greatly different from marine aerosols, discarding its contribution to dust at this distance inland. Sr and S isotopic values in groundwater indicate a strong relation with three main geological units: i) Paleozoic rocks contribute high radiogenic strontium isotope ratios to groundwater (0.707011-0.714862), while sulphate isotopic composition is probably acquired from atmospheric dust (>- 1.4 parts per thousand), ii) Jurassic marine limestones contribute low-radiogenic strontium isotopic ratios to groundwater (<0.70784), while sulphate can be related to oxidized sulphides that change the isotopic signatures of sulphur (<- 12%), and iii) mixed salts in the Atacama Gravels contribute lower radiogenic strontium isotopic ratios and sulphate to groundwater (Sr-87/Sr-86: <0.707324; delta S-34(SO4): +0.1 to +7.7). These three processes reflect water-rock interactions. The delta B-11 of groundwater generally up to +13 parts per thousand, does not increase along the regional groundwater flow path, discarding fractionation by interaction with clays. These results improve the understanding of the groundwater evolution in hyper-arid systems through a new conceptual model. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Hydrogeology Hyper-arid desert Environmental isotopes Physico-chemical processes Atmospheric deposition
类型	Article
语种	英语
国家	Chile ; USA ; Spain
收录类别	SCI-E
WOS记录号	WOS:000482549900033
WOS关键词	PAMPA DEL TAMARUGAL ; NORTHERN CHILE ; ATMOSPHERIC DEPOSITION ; REGIONAL AQUIFER ; CLIMATE-CHANGE ; RECHARGE ; NITRATE ; BORON ; WATER ; BASIN
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2019-11-10
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310808
作者单位	1.UCN, Dept Geol Sci, Antofagasta, Chile; 2.Rutgers State Univ, Earth & Planetary Sci, Piscataway, NJ USA; 3.Tech Univ Catalonia, Royal Acad Sci, Barcelona, Spain; 4.Tech Univ Catalonia, Grp Groundwater Hydrol, Dept Civil & Environm Engn, Barcelona, Spain; 5.UB, SGR Mineral Aplicada Geoquim & Geomicrobiol, Dept Mineral Petr & Geol Aplicada, Fac Ciencies Terra,Grp MAiMA, C Marti Franques S-N, Barcelona 08028, Spain
推荐引用方式 GB/T 7714	Gamboa, Carolina,Godfrey, Linda,Herrera, Christian,et al. The origin of solutes in groundwater in a hyper-arid environment: A chemical and multi-isotope approach in the Atacama Desert, Chile[J],2019,690:329-351.
APA	Gamboa, Carolina,Godfrey, Linda,Herrera, Christian,Custodio, Emilio,&Soler, Albert.(2019).The origin of solutes in groundwater in a hyper-arid environment: A chemical and multi-isotope approach in the Atacama Desert, Chile.SCIENCE OF THE TOTAL ENVIRONMENT,690,329-351.
MLA	Gamboa, Carolina,et al."The origin of solutes in groundwater in a hyper-arid environment: A chemical and multi-isotope approach in the Atacama Desert, Chile".SCIENCE OF THE TOTAL ENVIRONMENT 690(2019):329-351.