A crystal tuff layer about 5 cm thick, was found at Faltona (comune di Bibbona, Livorno) interlayered in clay sediments belonging to the Miocene pre-evaporitic fluvio-Iacustrine succession of the Volterra - Radicondoli - Chiusdino Basin. The crystal tuff is fairly well lithified and is made up of predominant arenitic-grained plagioclase and biotite crystals. The biotite K/Ar dating yelded an apparent age of 8.07 ± 0.11 Ma. According to the most recent literature, no magmatic activity was present at this time in the Tuscan area; nevertheless, the crystal tuff mineral assemblage and its grain size suggest a parentage with the volcanic activity of the nearby Island of Capraia. The finding of a vo1canic deposit in the Tortonian fluvio-Iacustrine succession outcropping west of the "Dorsale Medio-toscana" permitted to draw some considerations about the age of the whole succession and its sedimentation rate.
D'Orazio, M., Foresi, L.M., Laurenzi, M.A., Sandrelli, F., Testa, G. (1995). Studio petrografico e cronologico di un livello tufitico intercalato nella successione continentale pre-evaporitica dell'Area di Sassa (provincia di Livorno). STUDI GEOLOGICI CAMERTI. VOLUME SPECIALE, 1995/1, 373-381.
Studio petrografico e cronologico di un livello tufitico intercalato nella successione continentale pre-evaporitica dell'Area di Sassa (provincia di Livorno)
FORESI, L. M.;SANDRELLI, F.;
1995-01-01
Abstract
A crystal tuff layer about 5 cm thick, was found at Faltona (comune di Bibbona, Livorno) interlayered in clay sediments belonging to the Miocene pre-evaporitic fluvio-Iacustrine succession of the Volterra - Radicondoli - Chiusdino Basin. The crystal tuff is fairly well lithified and is made up of predominant arenitic-grained plagioclase and biotite crystals. The biotite K/Ar dating yelded an apparent age of 8.07 ± 0.11 Ma. According to the most recent literature, no magmatic activity was present at this time in the Tuscan area; nevertheless, the crystal tuff mineral assemblage and its grain size suggest a parentage with the volcanic activity of the nearby Island of Capraia. The finding of a vo1canic deposit in the Tortonian fluvio-Iacustrine succession outcropping west of the "Dorsale Medio-toscana" permitted to draw some considerations about the age of the whole succession and its sedimentation rate.
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https://hdl.handle.net/11365/39557
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