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Modeling alternative paths of chemical evolution of Na-HCO$_{3}$-type groundwater near Oak Ridge, Tennessee, USA

Content Provider	Springer Nature Link
Author	Toran, Laura E. Saunders, James A.
Copyright Year	1999
Abstract	This paper demonstrates that both cation exchange, a commonly invoked mechanism, and silicate hydrolysis, which is less commonly considered, can produce Na-HCO3-type water in sedimentary rocks. Evolution of Na-HCO3 groundwater beneath the Oak Ridge Reservation, Tennessee, USA, was studied by comparing observed end-member groundwater composition from multiport samplers to compositions generated by reaction-path geochemical models. Observed groundwater compositions could be reproduced by either the silicate-hydrolysis model or the cation-exchange model. Secondary minerals precipitated in the silicate-hydrolysis model are similar to those present along fractures in the shale and carbonate host rocks, and observed molar Sr2+/Ca2+ ratios more closely resemble evolution from shale weathering. Both mechanisms should be considered to understand the evolution of Na-HCO3 groundwater. Ce papier montre que l'échange cationique, mécanisme invoqué communément, et l'hydrolyse de silicates, plus rarement pris en considération, peuvent tous deux produire des eaux à faciès bicarbonaté sodique dans les roches sédimentaires. L'évolution des eaux souterraines à faciès bicarbonaté sodique dans la Réserve d'Oak Ridge (Tennessee, États-Unis) a étéétudiée en comparant la composition observée de l'eau souterraine finale fournie par des échantillonneurs à celles produites par des modèles de réactions géochimiques. Les compositions observées de l'eau souterraine ont pu être reproduites soit par le modèle d'hydrolyse de silicates, soit par celui d'échange de cations. Les minéraux secondaires précipités dans le cas du modèle d'hydrolyse de silicates sont semblables à ceux présents le long des fractures dans les schistes argileux et dans l'encaissant carbonaté; les rapports molaires Sr2+/Ca2+ observés sont en bon accord avec une évolution par altération des schistes. Les deux mécanismes doivent être pris en considération pour comprendre l'évolution des eaux souterraines à faciès bicarbonaté sodique. Se demuestra que tanto el intercambio catiónico como la hidrólisis de silicatos, el segundo de ellos un mecanismo menos comúnmente considerado, pueden dar lugar a un agua subterránea de tipo bicarbonatado-sódico en rocas sedimentarias. Se estudió la evolución de un agua de tipo Na-HCO3 – localizada bajo la Reserva de Oak Ridge, en Tennessee (EE.UU.). El estudio se llevó a cabo mediante la comparación entre las composiciones químicas observadas en diversas muestras y las generadas mediante modelos geoquímicos unidimensionales. Las composiciones observadas se pudieron reproducir tanto con un modelo de hidrólisis de silicatos, como con uno de intercambio catiónico. Los minerales secundarios que precipitan en el modelo de hidrólisis son similares a los presentes a lo largo de las fracturas de rocas carbonatadas y pizarras, y los valores de Sr2+/Ca2+ observados se podrían obtener por la meteorización de las pizarras. Ambos mecanismos deberán considerarse para entender la evolución de un agua de tipo bicarbonatado-sódico
Starting Page	355
Ending Page	364
Page Count	10
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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