干旱区生态环境知识资源中心(Arid): Origin of old saline groundwater in the deep coastal formations of the Atacama Desert region: Consideration of lithium, boron, strontium and uranium isotopes contents

Arid

DOI	10.1016/j.jhydrol.2023.129919
	Origin of old saline groundwater in the deep coastal formations of the Atacama Desert region: Consideration of lithium, boron, strontium and uranium isotopes contents
	Herrera, C.; Godfrey, L.; Urrutia, J.; Custodio, E.; Gamboa, C.; Jodar, J.; Lam, E.; Fuentes, J.
通讯作者	Herrera, C
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2023
卷号	624
英文摘要	This paper presents a multi-isotopic study to investigate the origin of saline groundwater in the Cordillera de la Costa, in the arid Atacama Desert region in northern Chile. Understanding the origin of deep saline groundwater can be challenging using only hydrogeochemical and common isotope methods. New 87Sr/86Sr, & delta;11B, & delta;7Li, and 234U/238U values of dissolved salts have been added to previously known chemical and isotopic compositions of groundwater, inorganic dissolved carbon, and sulfate. In this extremely arid area, the chemical and isotopic compositions of coastal springs primarily reflect the concentration of salts from atmospheric wet and dry deposition, which accumulate in the topsoil and dissolve during the occasional heavy rainfall events. These events recharge the aquifer with sodium-chloride type, high salinity water, with rock weathering contributing minimally to the chemical composition of groundwater. However, high salinity water of the calcium chloride and sodium-calcium chloride types in the deep fractured aquifer have a significantly different chemical and isotopic composition. In this investigation, it has been concluded that the salinity of these last waters is due to remnants of ancient marine water, mineral alteration and interaction with predominantly andesitic volcanic rocks in the Cordillera de la Costa. The deep saline groundwater has & delta;11B values between 17.3%o and 20.7%o, and 87Sr/86Sr values below 0.706, suggesting mixing with recharge groundwater. The & delta;7Li composition of the deep ground-water varies between 23.5%o and 31.5%o, pointing to a contribution of salts of marine origin and mineral alteration. However, the low Li concentrations relative to B in recharge water and in deep groundwater shows a preferential Li removal from pore water. Uranium and uranium isotopes data are limited to shallow groundwater due to the very low U concentrations in deep groundwater following reduction of U, and point to enhanced water-rock interaction in a rock-dominated environment. The dissolution of old buried saline deposits at shallow depth as a source of salinity is ruled out.
英文关键词	Lithium isotopes Boron isotopes Strontium isotopes Fractured rock Old saline groundwater Atacama Desert
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001050926500001
WOS关键词	NORTHERN CHILE ; SEAWATER CHEMISTRY ; SECULAR VARIATION ; COPPER-DEPOSITS ; AQUIFER SYSTEM ; SURFACE-WATER ; ANDEAN ARC ; EVOLUTION ; RECHARGE ; TRACERS
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397410
推荐引用方式 GB/T 7714	Herrera, C.,Godfrey, L.,Urrutia, J.,et al. Origin of old saline groundwater in the deep coastal formations of the Atacama Desert region: Consideration of lithium, boron, strontium and uranium isotopes contents[J],2023,624.
APA	Herrera, C..,Godfrey, L..,Urrutia, J..,Custodio, E..,Gamboa, C..,...&Fuentes, J..(2023).Origin of old saline groundwater in the deep coastal formations of the Atacama Desert region: Consideration of lithium, boron, strontium and uranium isotopes contents.JOURNAL OF HYDROLOGY,624.
MLA	Herrera, C.,et al."Origin of old saline groundwater in the deep coastal formations of the Atacama Desert region: Consideration of lithium, boron, strontium and uranium isotopes contents".JOURNAL OF HYDROLOGY 624(2023).