NDLI: A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach

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A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach

Content Provider	Springer Nature Link
Author	Dewandel, Beît Lachassagne, Patrick Boudier, Françoise Al Hattali, Saïd Ladouche, Bernard Pinault, Jean Louis Al Suleimani, Zaher
Copyright Year	2005
Abstract	Ophiolites are found all over the world: from the Alps to the Himalayas, in Cuba, Papua-New Guinea, New Caledonia, Newfoundland, etc. They are composed of hard rocks—basalt, dolerite, gabbro and peridotite, which are formed at the mid-oceanic ridges, with specific ridge-related tectonic fracturing and intense hydrothermal alteration. Their geological and thus their hydrogeological properties differ from those of both granite or “classical” gabbro and “classical” basaltic lava. A conceptual hydrogeological model of these hard-rock aquifers was developed based on the convergent results of a multidisciplinary approach at several spatial scales, from rock-sample (centimetre) to catchment (kilometre), on well-preserved ophiolite rocks in Oman. In ophiolite rocks, groundwater circulation takes place mostly in the fissured near-surface horizon (≈50 m thick), and, to a lesser degree, in the tectonic fractures. Hydrograph analysis (Water Resour Res 34:233–240, 1977), interpretation of numerous pumping tests using both classical Theis and dual porosity models [Water Resour Res 32:2733–2745, 1996; Comput Geosci J (in press)], and mercury porosity and hydraulic conductivity lab-measurements support the aquifer parameter estimates. The hydraulic conductivity K of the fissured horizon is estimated at 10$^{−5}$ to 10$^{−6}$ m/s for gabbro and dolerite, and 10$^{−7}$ m/s for peridotite. The storage coefficient S of the peridotite aquifer is estimated at 10$^{−3}$ and appears to be controlled mainly by microcracks (20 to 100 μm wide). Tectonic fractures in the ophiolite have similar hydrodynamic properties regardless of lithology (10$^{−1}$50 m de espesor) y en un grado menos importante en fracturas tectónicas. Los estimados de los parámetros de estos acuíferos se basan en análisis de hidrógrafos (Water Resour Res 34:233–240, 1977), en la interpretación de pruebas de bombeo usando los modelos clásicos de Theis y de porosidad doble (Hamm y Bidaux 1996; Lods y Gouze, [en prensa]), y porosidad de mecurio y conductividad hidraúlica medida en el laboratorio. La conductividad hidraúlica K del horizonte fisurado se estima en 10E-5 a 10E-6 m-s para gabro y dolerita y 10E-7 para peridotita. El coeficiente de abastecimiento S del acuífero peridotita se estima en 10–3 y parece ser controlado principalmente por microfracturas (20 to 100 μm de ancho). Las fracturas tectónicas en la ofiolita tienen propiedades hidrodinámicas similares independientes de la litología (10–1
Starting Page	708
Ending Page	726
Page Count	19
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	13
Issue Number	5-6
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-05-20
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Basalt Conceptual model Fissures Fractures Gabbro Hard-rock Hydraulic conductivity Hydrochemistry Oman Ophiolite Peridotite Recharge
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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