NDLI: Radiocarbon dating and the $^{36}$Cl/Cl evolution of three Great Artesian Basin wells at Dalhousie, South Australia

Content Provider	Springer Nature Link
Author	Abu Risha, Usama A.
Copyright Year	2016
Abstract	The use of $^{14}$C (half-life = 5,730 years) in modeling the evolution of the $^{36}$Cl/Cl ratios in groundwater is reported for the first time. The complexity of the Cl–$^{36}$Cl system due to the occurrence of different Cl and $^{36}$Cl sources and the difficulty of the determination of the initial groundwater $^{36}$Cl/Cl ratios have raised concerns about the reliability of using $^{36}$Cl (half-life = 301 thousand years, a) as a groundwater-dating tool. This work uses groundwater $^{14}$C age as a calibrating parameter of the Cl–$^{36}$Cl/Cl decay-mixing models of three wells from the southwestern Great Artesian Basin (GAB), Australia. It aims to allow for the different sources of Cl and $^{36}$Cl in the southwestern GAB aquifer. The results show that the initial Cl concentrations range from 245 to 320 mg/l and stable Cl is added to groundwater along flowpaths at rates ranging from 1.4 to 3.5 mg/l/ka. The $^{36}$Cl content of the groundwater is assumed to be completely of atmospheric origin. The samples have different Cl–$^{36}$Cl/Cl mixing-decay models reflecting recharge under different conditions as well as the heterogeneity of the aquifer.L’utilisation du $^{14}$C (demi-vie = 5,730 ans) dans la modélisation de l’évolution des rapports du $^{36}$Cl/Cl dans les eaux souterraines est présentée pour la première fois. La complexité du système Cl–$^{36}$Cl en raison de l’occurrence de différentes sources du Cl et du $^{36}$Cl et de la difficulté de la détermination de des rapports $^{36}$Cl /Cl initiaux de l’eau souterraine ont soulevé des préoccupations au sujet de la fiabilité de l’utilisation du $^{36}$Cl (demi-vie = 301 milles ans (ka)) comme un outil de datation des eaux souterraines. Ce travail utilise l’âge de l’eau souterraine déterminé à l’aide du $^{14}$C en tant que paramètre de calibration des modèles de désintégration-mélange du Cl–$^{36}$Cl/Cl appliqués sur trois puits du sud-ouest du Grand Bassin Artésien (GAB), en Australie. Il a pour but de tenir compte des différentes sources de Cl et $^{36}$Cl dans le Sud-Ouest de l’aquifère GAB. Les résultats montrent que les concentrations initiales de Cl sont comprises entre 245 à 320 mg/l et que le Cl stable est ajouté aux eaux souterraines le long des voies d’écoulement à des taux variant entre 1.4 et 3.5 mg/ l/ka. La teneur en $^{36}$Cl de l’eau souterraine est supposée être entièrement d’origine atmosphérique. Les échantillons permettent l’élaboration de différents modèles de mélange-désintégration Cl–$^{36}$Cl/Cl, reflétant la recharge pour des conditions différentes, ainsi que l’hétérogénéité de l’aquifère.Se reporta por primera vez el uso de $^{14}$C (vida media = 5,730 years) en el modelado de la evolución de la relación $^{36}$Cl/Cl en agua subterránea. La complejidad del sistema Cl–$^{36}$Cl debido a la ocurrencia de diferentes fuentes de Cl y $^{36}$Cl y la dificultad de la determinación inicial en el agua subterránea de las relaciones $^{36}$Cl/Cl han generado preocupación acerca de la fiabilidad de la utilización de $^{36}$Cl (vida media = 301 mil años (ka)) como una herramienta de la datación del agua subterránea. Este trabajo utiliza la edad $^{14}$C del agua subterránea como un parámetro de calibración de los modelos de desintegración de la mezcla Cl–$^{36}$Cl/Cl de tres pozos en la gran cuenca artesiana (GAB) del sudoeste de Australia. Su objetivo es tener en cuenta las diferentes fuentes de Cl y $^{36}$Cl en el acuífero GAB del sudoeste. Los resultados muestran que las concentraciones iniciales de Cl van de 245 a 320 mg/l y el Cl estable se adiciona al agua subterránea a lo largo de trayectorias de flujo a tasas que van desde 1.4 a 3.5 mg/l/ka. El contenido de $^{36}$Cl del agua subterránea se supone que es completamente de origen atmosférico. Las muestras tienen diferentes modelos de mezcla de desintegración- Cl–$^{36}$Cl/Cl reflejando la recarga bajo distintas condiciones así como la heterogeneidad del acuífero.首次论述了在模拟地下水$^{36}$Cl/Cl比值演化中$^{14}$C(半衰期5730年)的应用。Cl 和 $^{36}$Cl不同来源造成的Cl–$^{36}$Cl系统的复杂性及确定初始地下水$^{36}$Cl/Cl比值的困难性引起了人们对采用$^{36}$Cl(半衰期 = 301千年)作为地下水测年工具的可靠性的关注。本项工作利用地下水$^{14}$C年龄作为澳大利亚西南大自流盆地三口井Cl–$^{36}$Cl/Cl衰变--混合模型的校正参数。目的就是考虑到西南大自流盆地含水层中的Cl 和 $^{36}$Cl来于不同。结果显示,Cl出示含量为245 至320 毫升/升,稳定Cl沿水流通道加入地下水,速度为1.4至3.5 毫克/升/千年。假定地下水中的$^{36}$Cl含量完全来自大气。样品有不同的Cl–$^{36}$Cl/Cl混合-衰减模型,反映不同条件下的补给以及含水层的异质性。O uso de $^{14}$C (meia-vida = 5,730 anos) na modelagem da evolução de razões $^{36}$Cl/Cl nas águas subterrâneas é relatado pela primeira vez. A complexidade do sistema Cl–$^{36}$Cl à diferentes fontes de Cl e $^{36}$Cl e a dificuldade na determinação das razões $^{36}$Cl/Cl nas águas subterrâneas têm levantado dúvidas quanto a validade em utilizar-se $^{36}$Cl (meia-vida = 301 mil anos, ka) como uma ferramenta de datação de águas subterrâneas. Esse trabalho usa a idade $^{14}$C das águas subterrâneas como um parâmetro de calibração dos modelos de decaimento-mistura Cl–$^{36}$Cl/Cl de três poços da porção sudoeste da Grande Bacia Artesiana (GBA), Austrália. Isso objetiva levar em conta as diferentes fontes de Cl e $^{36}$Cl na porção sudoeste do aquífero GBA. Os resultados mostram que a concentração inicial de Cl varia de 245 a 320 mg/l a Cl estável é adicionado às águas subterrâneas por fluxos direcionais com taxas variando de 1.4 a 3.5 mg/l/ka. Assume-se que o conteúdo de $^{36}$Cl nas águas subterrâneas é de origem completamente atmosférica. As amostras têm modelos de decaimento-mistura Cl–$^{36}$Cl/Cl diferentes, refletindo a recarga sob diferentes condições, assim como a heterogeneidade do aquífero.
Starting Page	987
Ending Page	1000
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	24
Issue Number	4
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-28
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Australia Groundwater age Hydrochemical modeling Carbon-14 Chlorine-36 Hydrogeology Hydrology/Water Resources Geology Water Quality/Water Pollution Geophysics/Geodesy Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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