NDLI: Assessment of recharge to groundwater systems in the arid southwestern part of Northern Territory, Australia, using chlorine-36

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Assessment of recharge to groundwater systems in the arid southwestern part of Northern Territory, Australia, using chlorine-36

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Assessment of recharge to groundwater systems in the arid southwestern part of Northern Territory, Australia, using chlorine-36

Content Provider	Springer Nature Link
Author	Cresswell, Richard Wischusen, John Jacobson, Gerry Fifield, Keith
Copyright Year	1999
Abstract	The sustainability of community water supplies drawn from shallow aquifers in the arid southwest of the Northern Territory has been evaluated using the radioactive isotope chlorine-36 (36Cl). These aquifers include fractured sandstones of the Ngalia Basin, fractured metamorphic rocks and Cainozoic sands and gravels. 36Cl/Cl ratios for these shallow, regional groundwaters exhibit a bimodal distribution with peaks at 205 (±7) and 170 (±7)×10–15. The higher ratio probably represents modern (Holocene) recharge, diluted with windblown salts from local playa lakes, and occurs mostly around the margin of the basin. The lower ratio corresponds to a 36Cl "age", or mean residence time, of 80–100 ka, implying that the last major recharge occurred during the last interglacial interval (Oxygen Isotope Stage 5). These values are mainly observed in the interior of the Ngalia Basin. Lower values of the 36Cl/Cl ratio measured near playa lakes are affected by addition of chloride from remobilised salts. Finite carbon-14 (14C) data for the groundwaters are at variance with the 36Cl results, but a depth profile suggests low recharge, allowing diffusion of recent atmospheric carbon to the water table. The 36Cl results have important implications for groundwater management in this region, with substantial recharge only occurring during favourable, wet, interglacial climatic regimes; most community water supplies are dependent on these "old" waters. La pérennité de la ressource de nappes phréatiques du sud-ouest aride des Territoires du Nord (Australie), destinée à l'AEP, a étéétudiée à l'aide de l'isotope radioactif chlore-36. Ces aquifères sont constitués de grès fracturés du bassin de Ngalia, de roches métamorphiques fracturées et de sables et de graviers tertiaires. Les rapports 36Cl/Cl pour ces nappes phréatiques d'extension régionale répondent à une distribution bimodale, avec un pic à 205±7 et 170±7×10–15. Les valeurs les plus élevées sont probablement relatives à la recharge moderne (Holocène), diluée par les sels d'origine éolienne de lacs locaux de playas ; elles sont surtout observées à la périphérie du bassin. Les valeurs les plus faibles correspondent à un "âge" 36Cl, ou à un temps de séjour moyen, de 80 à 100 ka, impliquant que le dernier épisode majeur de recharge s'est produit au cours du dernier interglaciaire (stade isotopique 5). Ces valeurs sont principalement observées à l'intérieur du bassin de Ngalia. Des valeurs plus faibles du rapport 36Cl/Cl mesurés près des lacs de playas sont dus à l'apport de chlorure provenant de sels remobilisés. Des données limitées de 14C pour les eaux souterraines sont incompatibles avec les résultats de 36Cl, mais un profil vertical indique une recharge faible permettant une diffusion du carbone atmosphérique récent vers la nappe. Les résultats de 36Cl offrent des perspectives importantes pour l'aménagement de cette région, avec une recharge significative se produisant uniquement à la faveur de régimes climatiques favorables, humides, interglaciaires ; aussi la plupart des AEP de cette région dépendent de ces eaux "anciennes". Se ha evaluado la sostenibilidad de los recursos de agua subsuperficial en una zona árida al sudoeste del Territorio del Norte (Australia), mediante la utilización del isótopo radioactivo 36Cloro. Entre los acuíferos estudiados se encuentran las areniscas fracturadas de la Cuenca del Ngalia, rocas metamórficas fracturadas, arenas Cenozoicas y gravas. La relación 36Cl/Cl para estas aguas presenta una distribución bimodal, con picos a 205 (+/–7) y 170 (+/–7)×10–15. El valor mayor representa probablemente una recarga moderna (Holocena), diluída con sales procedentes de lagunas de playa, y tiene lugar principalmente en las márgenes de la cuenca. El valor menor corresponde a un tiempo medio de residencia de 80-100 ka, indicando que el último gran episodio de recarga tuvo lugar durante el último intervalo interglaciar. Estos valores se observan principalmente en el interior de la Cuenca del Ngalia. Los valores bajos de 36Cl/Cl medidos cerca de lagunas de playa están afectados por la adición de cloruro procedente de sales removilizadas. Los pocos datos de 14C disponibles no parecen concordar con los resultados del 36Cl, pero un perfil en profundidad sugiere una recarga muy baja, lo que permitiría la difusión de carbono atmosférico reciente hacia el nivel freático. Estos resultados tienen grandes implicaciones para la gestión del agua subterránea en esta región, donde la recarga sólo es significativa durante regímenes climáticos interglaciares y donde el suministro de gran parte de la comunidad depende de estas aguas "antiguas".
Starting Page	393
Ending Page	404
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	7
Issue Number	4
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-10-01
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Geology 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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