Options
Second University of Naples, Italy
3 results
Now showing 1 - 3 of 3
- PublicationRestrictedNew insights on the Holocene marine transgression in the Bahía Camarones (Chubut, Argentina)(2012)
; ; ; ; ; ; ; ; ; ; ; ; ;Zanchetta, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Consoloni, I.; Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy ;Isola, I.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Pappalardo, M.; Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy ;Ribolini, A.; Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy ;Aguirre, M.; CONICET, INGEA UNLP, Laboratorio 6 (Malacofauna Cuaternaria), La Plata, Argentina; Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, INGEA, La Plata, Argentina. ;Fucks, E.; Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, INGEA, La Plata, Argentina ;Baneschi, I.; IGG-CNR, Pisa, Italy ;Bini, M.; Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy ;Ragaini, L.; Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy ;Terrasi, F.; CIRCE, Department of Environmental Sciences, Second University of Naples, Caserta, Italy ;Boretto, G.; CICTERRA (Centro de Investigaciones en Ciencias de la Tierra), Còrdoba, Argentina.; ; ; ; ; ; ; ; ; ; ; The stratigraphic reconstruction of the northern sector of the Bahía Camarones (Chubut, Argentina) allowed to improve our understanding of the Holocene marine transgression in the area. The first phase of the maximum of the transgression, is interpreted as dominated by the high rate of eustatic rise of sea level until ca. 6-7 ka BP possibly associated to sedimentary starvation as suggested by fossil accumulation. After this first phase, the general trend indicates a progressive fall of the relative sea level after the Middle Holocene high stand as documented in other parts of south America Atlantic coast. Our data, coupled with the robust radiocarbon data set available for the area from literature, indicate three main local steps of coastal aggradation between ca. 6600 and 5400 yr BP (ca. 7000-5600 yr cal BP), ca. 3300 and 2000 yr BP (ca. 3100-1700 yr cal BP), and ca. 1300-500 yr BP (ca. 1000-300 yr cal BP). A significant age gap in coastal aggradation is present between ca. 5300 and 4400 yr BP (ca. 5600-4500 yr cal BP), and perhaps between ca 2000 and 1300 yr BP (ca. 1700-1000 yr cal BP). These can be linked to phases of local sea level fall and/or phases of sedimentary starvation and/or changes in drift transport which can have produced local coastal cannibalization. However, no conclusive data can be advanced. Data obtained from careful measurements of sea level markers represented by the top of marsh and fluvial terraces indicate lower values for the sea level estimation compared with the data set previously proposed for the area. This stigmatizes the fact that field-oriented works are still the priority in the Patagonia coast along with accurate age measurement, especially for obtaining the fundamental information we need for predicting the environmental impact, in these coastal areas, from accelerate sea level rise as effect of global warming.224 22 - PublicationRestrictedMagma transfer at Campi Flegrei caldera (Italy) before the 1538 AD eruption(2016)
; ; ; ; ; ; ; ; ; ; ; ; ;Di Vito, M. A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Acocella, V.; 2Dipartimento di Scienze Università Roma Tre, Italy. ;Aiello, G.; 3Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse, Università degli Studi di Napoli Federico II, Italy ;Barra, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Battaglia, M.; 4Dipartimento di Scienze della Terra, Sapienza, Roma, Italy. ;Carandente, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Del Gaudio, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;de Vito, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Ricciardi, G. P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Ricco, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Scandone, R.; 2Dipartimento di Scienze Università Roma Tre, Italy. ;Terrasi, F.; Dipartimento di Matematica e Fisica, Seconda Università di Napoli, Italy; ; ;; ; ; ; ; ; ; ; Calderas are collapse structures related to the emptying of magmatic reservoirs, often associated with large eruptions from long-lived magmatic systems. Understanding how magma is transferred from a magma reservoir to the surface before eruptions is a major challenge. Here we exploit the historical, archaeological and geological record of Campi Flegrei caldera to estimate the surface deformation preceding the Monte Nuovo eruption and investigate the shallow magma transfer. Our data suggest a progressive magma accumulation from ~1251 to 1536 in a 4.6 ± 0.9 km deep source below the caldera centre, and its transfer, between 1536 and 1538, to a 3.8 ± 0.6 km deep magmatic source ~4 km NW of the caldera centre, below Monte Nuovo; this peripheral source fed the eruption through a shallower source, 0.4 ± 0.3 km deep. This is the first reconstruction of pre-eruptive magma transfer at Campi Flegrei and corroborates the existence of a stationary oblate source, below the caldera centre, that has been feeding lateral eruptions for the last ~5 ka. Our results suggest: 1) repeated emplacement of magma through intrusions below the caldera centre; 2) occasional lateral transfer of magma feeding non-central eruptions within the caldera. Comparison with historical unrest at calderas worldwide suggests that this behavior is common.524 18 - PublicationRestrictedMiddle- to late-Holocene relative sea-level changes at Puerto Deseado (Patagonia, Argentina)(2014)
; ; ; ; ; ; ; ; ; ; ;Zanchetta, G.; DST Università di Pisa ;Bini, M.; DST Università di Pisa ;Isola, I.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Pappalardo, M.; DST Università di Pisa ;Ribolini, A.; DST Università di Pisa ;Consoloni, I.; DST Università di Pisa ;Boretto, G.; Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), Argentina ;Fucks, E.; Universidad Nacional de La Plata, Argentina ;Ragaini, L.; DST Università di Pisa ;Terrasi, F.; Second University of Naples, Italy; ; ; ; ; ; ; ; ; Stratigraphic, morphologic and radiocarbon data from Puerto Deseado coastal area (Santa Cruz Province, Argentina) indicate that the Holocene coastline formed in response to the discontinuous aggradation of coarse gravely beaches since c. 6300 cal. yr BP related to a progressive falling of relative sea level. Beach ridge crests crudely approximate to the sea level showing at least three steps of aggradation and relative sea-level lowering. Two inactive abrasive notches at c. 7.9 and 3.4 m a.s.l. have recorded this sea-level trend, suggesting two important phases when sea level was stationary. This allows the estimation of a rate of relative sea-level fall in the last c. 3500 years of c. 1.8 mm/yr. Moreover, notches and morphological data indicate that the crest of the beach ridges exceeded the sea-level height by c. 2 ± 0.5 m. This value provides a reasonable regional estimate to be applied to produce comparable relative sea-level curve for Atlantic Patagonia coast.304 20