Several samples of calcites, filling fractures in a restricted area of the southern volcano deposits at Vulcano island, were investigated. Data referring to isotope composition of U, C, O, Sr and fluid inclusions, give a solution, by indirect observations, to the chronostratigraphic problem of the trachybasaltic welded scoriae blankets (WSB) outcropping on Vulcano island. Th-230 ages, close to a value of 50 ka, d(13)C, d(18)O and Sr isotope composition suggest for the calcite deposition a unique event, correlated with a fast degassing, quickly draining deep fluids and probably connected with the first phase of the La Fossa Caldera collapse. The WSB connected to this first collapsed phase should have been deposited at 50 ka, and consequently they could be actually contemporary with the Piano Luccia WSB dated at 48 ka. (C) 1998 INQUA/Elsevier Science Ltd. All rights reserved.
Calcites at Vulcano island (Italy): Isotopic and geochronological data bearing on the timing of the La Fossa Caldera collapse / Mario, Voltaggio; M. E., Branca; Castorina, Francesca; Adriano, Taddeucci; Francesca, Tecce; Bruno, Turi; Pierluigi, Vesica. - In: QUATERNARY INTERNATIONAL. - ISSN 1040-6182. - STAMPA. - 47-8:8(1998), pp. 129-134. [10.1016/s1040-6182(97)00078-5]
Calcites at Vulcano island (Italy): Isotopic and geochronological data bearing on the timing of the La Fossa Caldera collapse
CASTORINA, Francesca;
1998
Abstract
Several samples of calcites, filling fractures in a restricted area of the southern volcano deposits at Vulcano island, were investigated. Data referring to isotope composition of U, C, O, Sr and fluid inclusions, give a solution, by indirect observations, to the chronostratigraphic problem of the trachybasaltic welded scoriae blankets (WSB) outcropping on Vulcano island. Th-230 ages, close to a value of 50 ka, d(13)C, d(18)O and Sr isotope composition suggest for the calcite deposition a unique event, correlated with a fast degassing, quickly draining deep fluids and probably connected with the first phase of the La Fossa Caldera collapse. The WSB connected to this first collapsed phase should have been deposited at 50 ka, and consequently they could be actually contemporary with the Piano Luccia WSB dated at 48 ka. (C) 1998 INQUA/Elsevier Science Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
