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Hydrogeology and hydrogeochemistry of an alkaline volcanic area: the NE Mt. Meru slope (East African Rift – Northern Tanzania)

Ghiglieri, Giorgio and Pittalis, Daniele and Cerri, Guido and Oggiano, Giacomo (2012) Hydrogeology and hydrogeochemistry of an alkaline volcanic area: the NE Mt. Meru slope (East African Rift – Northern Tanzania). Hydrology and Earth System Sciences, Vol. 16 , p. 529-541. eISSN 1607-7938. Article.

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DOI: 10.5194/hess-16-529-2012

Abstract

The objective of this study is to analyze the geochemical conditions associated with the presence of fluoride (F) in the groundwater of an area of Northern Tanzania. The studied aquifers are composed of volcanic rocks such as phonolitic and nephelinitic lavas, basalts, lahars of various ages and mantling ash. Sedimentary rocks consisting of fine-grained alluvial and lacustrine deposits occur as well. Samples collected from springs, borehole and surface water, during two monitoring surveys, were analyzed for the various physico-chemical and isotopic parameters. The geochemical composition of water is typically sodium bicarbonate. High values of F (up to 68 mg l−1) were recorded. The highest values of fluoride agreed with the highest values of pH, sodium and bicarbonate. Dissolution of major ions, exchange processes and precipitation of Ca2+ from supersaturated solutions joined with the local permeability and hydraulic gradients, control the fluoride mobilization and the contamination of the area.

Item Type:Article
ID Code:7556
Status:Published
Refereed:Yes
Uncontrolled Keywords:Rift, est Africa, fluorine, hydro-geochemistry
Subjects:Area 04 - Scienze della terra > GEO/09 Georisorse minerarie e applicazioni mineralogico- petrografiche per l'ambiente ed i beni culturali
Area 04 - Scienze della terra > GEO/05 Geologia applicata
Area 04 - Scienze della terra > GEO/03 Geologia strutturale
Divisions:001 Università di Sassari > 02 Centri > Centro interdipartimentale Nucleo di ricerca sulla desertificazione
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Copernicus on behalf of the European Geosciences Union
eISSN:1607-7938
Copyright Holders:© Author(s) 2012
Deposited On:11 May 2012 09:43

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