Tome Architecture and management of a geological repository - Andra
Tome Architecture and management of a geological repository - Andra
Tome Architecture and management of a geological repository - Andra
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3 – Design study <strong>of</strong> a <strong>repository</strong> in a granite formationFigure 3.2.2The <strong>geological</strong> history <strong>of</strong> a granite massif in stagesInterpretation <strong>of</strong> data collected is mainly based on reconstitution <strong>of</strong> the <strong>geological</strong> history <strong>of</strong> thegranite massif. Compiling the <strong>geological</strong> history <strong>of</strong> a granite massif means underst<strong>and</strong>ing thephenomena which have produced <strong>and</strong> structured it over the course <strong>of</strong> time; it means as well integratingthe various components <strong>of</strong> a massif according to a consistent <strong>and</strong> common historical rationale .On granite outcrops, rock fractures outline is emphasised by the effects <strong>of</strong> alteration, decompression<strong>and</strong> then surface erosion <strong>of</strong> the rock. The effects <strong>of</strong> this surface erosion become less marked betweensurface <strong>and</strong> a depth <strong>of</strong> a hundred metres or so: the rock is "sound" <strong>and</strong> the variations in compositionare the result <strong>of</strong> the granite’s original <strong>geological</strong> history.Dossier 2005 Granite - ARCHITECTURE AND MANAGEMENT OF A GEOLOGICAL REPOSITORY35/228
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