Friday, 31 August 2007
5.PS-125
Glacial and marine features in the recent sedimentary deposits of the Joides Basin (Antarctica)
Nicola Corradi1, Marco Ferrari1, Francesco Giordano2, and Roberta Ivaldi1. (1) Dip.Te.Ris. Dipartimento per lo Studio del Territorio e delle sue Risorse, University of Genoa, Corso Europa, 26, Genova, 16132, Italy, (2) DiSAm Dipartimento di Scienze per l'Ambiente, University of Naples Parthenope, Via De Gasperi, 5, Napoli, 80133, Italy
During 2004-2005 Programma Nazionale di Ricerche in Antartide (PNRA) Oceanographic Cruise high resolution seismic profiles were collected from the Joides basin (western Ross Sea). This basin is a tectonic depression modelled by glacial erosion, located in a key area, where the different Late Quaternary glacial fluctuations are recorded in sediment deposits. The analysis of these new high resolution seismic data (circa 600 miles of profiles using, simultaneously, a 120 Tip Sparker array 400-900 J and a Sub Bottom Profiler 3.5 kHz) provided precious information on sub surface units and seafloor morphology. In particular we present a detailed seismic stratigraphy characterization of recent sedimentary deposits. On the basis of the pattern of features observed and the analysis of the seismic facies, a reconstruction of the evolution of different environments (glacial, glacial marine, marine) is proposed.