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all geography including DSDP/ODP Sites and Legs
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Europe
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Southern Europe
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Italy
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Apennines
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Southern Apennines (1)
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Campania Italy
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geologic age
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Cenozoic
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minerals
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silicates
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sheet silicates
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clay minerals
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kaolinite (1)
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smectite (1)
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illite (1)
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deformation (1)
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Europe
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Apennines
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Mediterranean Sea
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sedimentary rocks
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QUANTITATIVE MINERALOGY OF CLAY-RICH SILICICLASTIC LANDSLIDE TERRAIN OF THE SORRENTO PENINSULA, ITALY, USING A COMBINED XRPD AND XRF APPROACH Available to Purchase
Extensional detachment faulting on the Tyrrhenian margin of the southern Apennines contractional belt (Italy) Available to Purchase
Shear deformation of pelitic rocks in a large-scale natural fault Available to Purchase
Abstract Experimental tests on simulated clay gouges and data from shear zones developed in pelitic media at convergent plate margins provide contrasting evidence regarding the hydraulic characteristics and, in consequence, the frictional properties of sheared clays. The natural shear zone analysed in this work indicates that shear strain can induce mineralogical changes in smectite-bearing sediments that imply loss of water from the smectite minerals and their replacement with anhydrous illite minerals. The extreme localization of the illitization process and its geometric characteristics allow us to argue that the reaction is initiated by stress concentration along the shear zone and, once discrete shears develop, it is accelerated by both cataclasis and the frictional dehydration of smectites. This process would generate fresh water from within the shear zone, leading to fluid overpressure build up, and can account for the observed hydraulic circulation and salinity anomalies in modern accretionary prisms.