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Hydrogeological features of a rocky massif to be used as a nuclear repository

Caractéristiques hydrogéologiques d'un massif rocheux destiné au stockage de déchets nucléaires

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Abstract

The Sierra del Medio rocky massif is situated in the central west sector of a probably closed Cainozoic sedimentary basin.

Sierra del Medio behaves as an area having a positive relief which receives rainfall and spreads it over the superficial smaller basins around. From the geological and geophysical points of view it is believed that the massif is separated from the adjacent basin water bearing formations by fractures belonging to the direct type.

It is formed by Palaeozoic migmatites of granitic to tonalitic composition intruded by acidic, mesosilicic and basic dikes. Ectinite xenoliths can also be found.

The different hydrogeological units in the rocky massif under study were defined preliminarily in geological, geophysical, mechanical and chemical detailed studies.

Tentative isopiezometric curves are shown and geophysical profiles are analyzed.

Résumé

Le massif rocheux de la Sierra del Medio est situé dans la partie centre-ouest d'un bassin sédimentaire cénozoïque probablement fermé.

Il se comporte comme une zone en relief recevant les eaux de pluie et les répandant sur les bassins superficiels plus petits qui l'entourent. Les considérations géologiques et géophysiques conduisent à penser que le massif est séparé du bassin adjacent renfermant des niveaux aquifères par des failles normales.

Le massif est constitué de migmatites paléozoïques de composition granitique ou tonalitique recoupées par des filons de roches acides à basiques; on y rencontre également des enclaves d'ectinites.

Les différentes unités hydrogéologiques dans le massif rocheux étudié ont été délimitées par des études géologiques, géophysiques, mécaniques et chimiques détaillées. La contribution présente un essai de cartographie piézométrique et l'analyse des profils géophysiques.

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Authors and Affiliations

  1. Institute of Mining Research-National University of San Juan-Argentina, San Juan, Argentina

    Grassi José Ivan

  2. Hydrogeology-Faculty of Natural Sciences-National University of San Juan-Grounwater Regional Center “C.R.A.S.”, San Juan, Argentina

    Wetten Cristian

Authors
  1. Wetten Cristian
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  2. Grassi José Ivan
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Wetten, C., Grassi, J.I. Hydrogeological features of a rocky massif to be used as a nuclear repository. Bulletin of the International Association of Engineering Geology 34, 95–101 (1986). https://doi.org/10.1007/BF02590240

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  • DOI: https://doi.org/10.1007/BF02590240

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