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ZS4'D,3'/&-;,3 V,"K3,'0,3'/&-;,3',L&*K",3'A'3+0#:,"$%#/,3'B Massifs sédimentaires cristallins 4 phases 2 types de massifs 1. Érosion Érosion par les éléments naturels: vent, eau, glace etc 2. Charriage rapide lent Galets, poudingues ( galets agglomérés) Graviers, sables Plage de Nice: charriage rapide ( Var ) = galets calcaires ( massifs sédimentaires ) Plage de Mandelieu: charriage lent ( Siagne ) = sable cristallin ( Tanneron ) Niveau de la mer Organismes marins Actions chimiques diverses 3. Dépôt Grains grossiers 1 à 2 mm Grains fins Grains très fins ( microns ) 4. Diagenèse Grés, arkoses, etc Pélites, marnes etc Argiles, schistes argileux etc Carbonate de calcium Ca CO3 calcite calcaires 34

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