Stratigraphic Interpretation of an Antarctic Shelf Edge

Abstract

A stratigraphic interpretation was carried out on the processed single-channel data. Four major sequence boundaries were interpreted; two are sub-horizontal erosional surfaces while the other two show permanent onlap. Four major sedimentary units were interpreted on the single-channel data within a time range of 730 ms. Shelf break exists at a water depth of 640±17 m on profile Fig. 2, 480±16 m on profile Fig. 3. The profiles were interpreted to show sequences of glacially prograded sediments lying underneath the outer continental shelf. These sediments were deposited by grounded ice during times of glacial maximum which caused deposition in an overall progradational style and the grounded ice must have reached the continental shelf edge many times on most parts of the Bellingshausen Sea margin. The continental shelf across the area where these lines are located is relatively horizontal and the movement of ice front was across the whole area.

Reprocessing 2-D Airgun Seismic Reflection Data SALTFLU (Salt Deformation And Sub-Salt Fluid Circulation In The Algero-Balearic Abyssal Plain) In the Balearic Promontory and the Algerian Basin

“…4e). Using a single deterministic operator yields better sub-seabed imaging and low frequency recovery superior to probabilistic methods (e.g., surface consistent, spiking and predictive deconvolution) and modelled source methods (Sargent et al, 2011;Davison and Poole, 2015;Maunde et al, 2017). Converting the seismic data to zero-phase tends to improve temporal resolution and lowers interference between closely spaced re ectors, allowing for better delineation of the stratigraphy, and is a necessary pre-condition for Kirchhoff-type migrations (Sheriff and Geldart, 1995).…”