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Au cours de leur histoire géologique, les basaltes triasiques du Moyen Atlas ont subi une transformation métamorphique précoce, à laquelle est venue se superposer une altération supergène. La présence de minéraux argileux ubiquistes (smectite et interstratifiés chlorite/smectite), à la fois dans le basalte et dans la saprolite, rend difficile la distinction entre les deux faciès et explique l'intérêt...
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