Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica)
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AuthorsPérez, L.F.; Maldonado, A; Bohoyo, F.; Hernández-Molina, F.J.; Vázquez-Garrido, J.T. (Juan Tomás); Lobo, F.J.; Martos, Y.M.
KeywordsIsolated deeo oceanic basins
Sedimentary processes in small, isolated oceanic basins that form adjacent to continental margins but detached from continents remain poorly understood. This work describes two such basins located in the southern Scotia Sea, the Protector and Pirie basins. We analysed multichannel seismic profiles to interpret morphostructural features and stratigraphy of these basins. Sedimentary stacking patterns and depocentre distribution illustrate basin development patterns. Basal units infill basement depressions formed by the submerged banks of thinned continental crust that abut the basin plains. These lower and middle deposits of the sedimentary record are interpreted as pre- and syn-rift deposits. The laterally extensive upper deposits are interpreted as post-rift deposits. These include five discrete units evident in seismic profiles. A prominent regional reflection referred to as Reflector-c, separates in these upper deposits two sets of seismic units that have recorded major shifts ...
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