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Pascucci, Vincenzo
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- PublicationRestrictedBasin deformation due to laccolith emplacement at Radicofani (Southern Tuscany, Italy)The Radicofani basin (Southern Tuscany), developed during regional extension, is mainly filled by a mio-pliocene clastic sequence. During Early Pleistocene, the Radicofani spatter cone formed in the centre of the basin. A broad anticline, whose formation was previously associated with both extensional and compressional tectonics, is present within the basin. In order to better define the anticline, we collected field, seismic and magnetic data. Field work constrained the surface geometry of the anticline, showing that the Radicofani vent is located along the trace of its axial plane. Seismic lines are consistent with field data and show a progressive decrease in the dip of the anticline layers towards the bottom of the Neogene succession. The measured magnetic field shows a systematic relationship with the anticline, suggesting the association with a buried magnetic body. The matching of these data suggests that the anticline is the result of the emplacement of a laccolith within the Radicofani basin, possibly related to the magmatic activity responsible for volcanism at Radicofani.
156 5 - PublicationRestrictedMultiproxy record for the last 4500 years from Lake Shkodra (Albania/Montenegro)(2012)
; ; ; ; ; ; ; ; ; ; ;Zanchetta, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Van Welden, A.; Geological Survey of Norway (NGU), Trondheim, Norway ;Baneschi, I.; IGG-CNR sez. Pisa, Pisa, Italy ;Drysdale, R. N.; Department of Resource Management and Geography, University of Melbourne, Victoria, Australia ;Sadori, L.; Dipartimento di Biologia Ambientale, Università ‘La Sapienza’, Rome, Italy ;Roberts, N.; School of Geography, Earth and Environmental Sciences, University of Plymouth, UK ;Giardini, M.; Dipartimento di Biologia Ambientale, Università ‘La Sapienza’, Rome, Italy ;Beck, C.; Laboratoire de Géodynamique des Chaînes Alpines, Université de Savoie, Le Bourget du Lac, France ;Pascucci, V.; Dipartimento Scienze Botaniche, Ecologiche e Geologiche University of Sassari, Sassari, Italy ;Sulpizio, R.; Dipartimento Scienze della Terra e Geoambientali, University of Bari, Bari, Italy; ; ; ; ; ; ; ; ; A multi-proxy record is presented for approximately the last 4500 cal a BP from Lake Shkodra, Albania/Montenegro. Lithological analyses, C/N ratio and δ13C of the organic and inorganic carbon component suggest that organic matter and bulk carbonate are predominantly authigenic. The δ18O record of bulk carbonate indicates the presence of two prominent wet periods: one at ca. 4300 cal a BP and one at ca. 2500–2000 cal a BP. The latter phase is also found in southern Spain and Central Italy, and represents a prominent event in the western and central Mediterranean. In the last 2000 years, four relatively wet intervals occurred between ca. 1800 and 1500 cal a BP (150–450 AD), 1350–1250 (600–700 AD), 1100–800 (850–1150 AD), and at ca. 90 cal a BP (1860 AD). Between ca. 4100 and 2500 cal a BP δ18O values are relatively high, with three prominent peaks indicating drier conditions at ca. 4100–4000 cal a BP, ca. 3500 and at ca. 3300 cal a BP. Four additional drier events are identified at 1850 (ca. 100 AD), 1400 (ca. 550 AD), 1150 (800 AD) and ca.750 cal a BP (1200 AD). The pollen record does not show changes in accordance with these episodes owing to the poor sensitivity of vegetation in this area, which is dominated by an orographic rainfall effect and where changes in altitudinal vegetation belts do not affect the pollen rain in the lake catchment. However, since ca. 900 cal a BP a significant decrease in the percentage arboreal pollen and in pollen concentrations suggest major deforestation produced by human activities. Copyright © 2012 John Wiley & Sons, Ltd.186 17 - PublicationOpen AccessLate Quaternary coastal uplift of southwestern Sicily, central Mediterranean sea(2021-03-01)
; ; ; ; ; ; ; ; ; ; ; Mapping and luminescence aging of raised marine terraces and aeolian ridges along an ∼90 km coastal stretch in southwestern Sicily provide the first quantitative assessment of vertical tectonic deformation in this region, which spans the frontal part of an active thrust belt. We recognized a staircase of eleven terraces and nine related aeolian ridges. The elevation profile of terraces parallel to the coast shows a >90 km long bell-shaped pattern, onto which shorter-wavelength (∼10 km long) undulations are superimposed. Luminescence ages from terraced beach deposits and aeolian sediments constrain the position of paleoshorelines formed during MIS 5e, 7a and 7c, with a maximum uplift rate of ∼0.75 mm/a, and indicate a late Middle-Late Pleistocene (80–400 ka) age for the sequence of terraces. The elevation of Lower Pleistocene morpho-depositional markers points that uplift may have occurred at similar rates at the beginning of the Early Pleistocene, but almost zeroed between ∼1.5 and 0.4 Ma before the recent renewal. The uneven elevation of Middle-Upper Pleistocene paleoshorelines observed moving along the coast documents that uplift embeds both a regional and a local component. The regional, symmetric bell-shaped uplift is related to involvement in the thrust belt of thicker crustal portions of the northern African continental margin. The short-wavelength undulations represent the local component and correspond to actively growing bedrock folds. The present study contributes to unravel the different spatial and temporal scales of deformation processes at a collisional margin.166 171