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handle: 10261/35482
[ESP]-Se estudia la alteración por agentes externos en rocas graniticas en cuatro perfiles, hallando la movilidad relativa de los elementos mayoritarios comunes en estas rocas. La evolución del ataque es hacia un producto más rico en Al, Fe y H2O que el material de partida. Los restantes elementos, salvo el Mn se eliminan. La presencia bialógica modifica ocasionalmente estas tendencias. La variación quimica global es poco acentuada. siendo notable el cambio físico de cohesión. porosidad y densidad.
[ENG]-Four profiles of weathered granitic rocks and the relative mobility of their major elements are studied in this paper. The residues are richer in aluminium, water and iron that the mother rock. The other elements. with exception of manganese, are elimined. Occarionaly, biological actions modify these tendencies. The total chemical variation is very small but the physical changes -cohesion, porosity and density are important.
Peer reviewed
14 p.
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