EFFETTI DEL RISCALDAMENTO NATURALE SULLE FORMAZIONI ARGILLOSE
As a contribution to the characterization of clay deposits as possible sites for nuclear waste disposal, the metamorphic effects induced on Pliocene argillaceous sediments by the small subvolcanic body of Orciatico (Tuscany, Italy) were investigated. In areas close to marginal facies of the magmatic body, where temperatures were presumably ranging from 100 to 500 degrees C, the thermometamorphic aureole thickness doesn't exceed 2 meters. In this zone the clay fraction (45-69% of the bulk rock) changes from an illite>f5&illite/smectite interstratified + vermiculite+chloritic intergrades assemblage to a paragenesis characterized only by illite + smectite, the latter being the most stable phase among the clay minerals. Within such zone alkalis (Na, K and Rb) and alkaline - earths (Ca and Sr) result to be the most highly mobilized elements.
Riferimenti bibliografici: EUR 10200 IT (1985) MF, 53 P., BFR 150, BLOW-UP COPY BFR 265, EUROFFICE, LUXEMBOURG, POB 1003
Disponibilità: Can be ordered online
Numero di registrazione: 1989124121900 / Ultimo aggiornamento: 1987-01-01
Lingue disponibili: it