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Tonielli, R.
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Tonielli, R.
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- PublicationRestrictedDTM-based morphometry of the Palinuro seamount (Eastern Tyrrhenian Sea): Geomorphological and volcanological implications(2010)
; ; ; ; ; ; ; ; ;Passaro, S.; Istituto per l'Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche, Calata Porta di Massa, Porto di Napoli, 80133, Napoli, Italy ;Milano, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;D'Isanto, C.; Istituto per l'Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche, Calata Porta di Massa, Porto di Napoli, 80133, Napoli, Italy ;Ruggieri, S.; Istituto per l'Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche, Calata Porta di Massa, Porto di Napoli, 80133, Napoli, Italy ;Tonielli, R.; Istituto per l'Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche, Calata Porta di Massa, Porto di Napoli, 80133, Napoli, Italy ;Bruno, P.P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Sprovieri, A.; Istituto per l'Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche, Calata Porta di Massa, Porto di Napoli, 80133, Napoli, Italy ;Marsella, E.; Istituto per l'Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche, Calata Porta di Massa, Porto di Napoli, 80133, Napoli, Italy; ; ; ; ; ; ; We present a high resolution DTM of the Palinuro Seamount (PS, Tyrrhenian Sea, Italy) resulting from the processing of multibeam swath bathymetry records acquired during the second leg of the “Aeolian 2007” cruise. PS consists of several superimposed volcanoes aligned along a N100°E strike and measures 55×25 km. The western and the central sectors result from the coalescence of collapse structures (calderas) with younger volcanic cones. The eastern sector reveals a more complex and articulated structure. In the central sector, a volcanic crater with a well-preserved rim not obliterated by erosional events suggests a volcanological rejuvenation of this sector. The presence of flat surfaces on the top of the seamount may be due to the formation of marine terraces during the last sea-level lowering. Lateral collapses on the northern and southern flanks of the seamount are probably related to slope instability, as suggested by the presence of steep slopes (25–40°). The main fault affecting PS strikes N65°E and shows a right lateral component of movement. E–W and N10°E striking faults are also present. Assuming that theN100°E deep-seated fault,which is responsible for theemplacement of PS,movedwith sinistral slips, we interpret the N65°E and the N10°E faults as right-lateral (second order) shear and left-lateral (third order) shear, respectively. Due to the particular location of the Palinuro Seamount, the data presented here allow us to better understand the volcanism and the geodynamic processes of the Tyrrhenian Sea.225 23 - PublicationRestrictedIntegrated stratigraphic reconstruction for the last 80 kyr in a deep sector of the Sardinia Channel (Western Mediterranean)(2009-05)
; ; ; ; ; ; ; ; ; ; ; ;Budillon, F.; Istituto per l’ Ambiente Marino Costiero, IAMC, Consiglio Nazionale delle Ricerche, Calata Porta di Massa 80, I-80133 Napoli, Italy ;Lirer, F.; Istituto per l’ Ambiente Marino Costiero, IAMC, Consiglio Nazionale delle Ricerche, Calata Porta di Massa 80, I-80133 Napoli, Italy ;Iorio, M.; Istituto per l’ Ambiente Marino Costiero, IAMC, Consiglio Nazionale delle Ricerche, Calata Porta di Massa 80, I-80133 Napoli, Italy ;Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Vallefuoco, M.; Istituto per l’ Ambiente Marino Costiero, IAMC, Consiglio Nazionale delle Ricerche, Calata Porta di Massa 80, I-80133 Napoli, Italy ;Ferraro, L.; Istituto per l’ Ambiente Marino Costiero, IAMC, Consiglio Nazionale delle Ricerche, Calata Porta di Massa 80, I-80133 Napoli, Italy ;Garziglia, S.; Géosciences-Azur, CNRS, BP 48, Fr-06235, Villefranche sur Mer, France ;Innangi, S.; Istituto per l’ Ambiente Marino Costiero, IAMC, Consiglio Nazionale delle Ricerche, Calata Porta di Massa 80, I-80133 Napoli, Italy ;Sahabi, M.; Faculté des Sciences, BP 20, 24000 El Jadida, Morocco ;Tonielli, R.; Istituto per l’ Ambiente Marino Costiero, IAMC, Consiglio Nazionale delle Ricerche, Calata Porta di Massa 80, I-80133 Napoli, Italy; ; ; ; ; ; ; ; ; ; A quantitative analysis of planktonic foraminifera, coupled with petrophysical and paleomagnetic measurements and 14C AMS calibrations, was carried out on a deep core recovered in the Sardinia Channel (Western Mediterranean Sea), during the CIESM Sub2 survey, providing an integrated stratigraphic time-framework over the last 80 kyr. Significant changes in the quantitative distribution of planktonic foraminifera allowed the identification of several eco-bioevents useful to accurately mark the boundaries of the eco-biozones widely recognised in the Western Mediterranean records and used for large scale correlations. Namely, 10 eco-biozones were identified based on the relative abundance of selected climate sensitive planktonic foraminiferal species. Sixteen codified eco-bioevents were correlated with the Alboran Sea planktonic foraminiferal data and four climatic global events (Sapropel S1, Younger Dryas, Greenland Isotope Interstadial 1, Greenland Isotope Stadial 2, Heinrich event H1-H6) were recognized. The eco-bioevents together with the 14C AMS calibrations allowed us to define an accurate age model, spanning between 2 and 83 kyr. The reliability of the age model was confirmed by comparing the colour reflectance (550 nm%) data of the studied record with the astronomically tuned record from the Ionian sea (ODP-Site 964). A mean sedimentation rate of about 7 cm/kyr included three turbidite event beds that were chronologically constrained within the relative low stand and lowering sea level phases of the MIS 4 and 3. The deep-sea sedimentary record includes a distinct tephra occurring at the base of the core which dates 78 ka cal. BP. The paleomagnetic data provide a well-defined record of the characteristic remanent magnetization that may be used to reconstruct the geomagnetic paleosecular variation for the Mediterranean back to 83 kyr.204 15