CENTRAL AND EASTERN BRANSFIELD BASINS (ANTARCTICA) FROM HIGH-RESOLUTIAN SWATH-BATHYMETRY DATA

Far the first time complete swath bathymetric maps of central and east ern Bransfield basins are presented at a medium scale and detailed mor phological descriptions are provided. Bathymetry reveals morphological structures which provide important information about the structure, v olcanism, and kinematics of these basins. The central basin is dominat ed by two roughly orthogonal sets of extensional faults (N065 degrees the main set and N145 degrees the secondary set), displays several dis continuous along-axis large volcanic cones and ridges trending about N 059 degrees, and undergoes extension roughly normal to the basin. The structure of the eastern basin has a roughly rhomboidal pattern (fault sets along N053 degrees and N103 degrees), displays four deep troughs and a much smaller amount of volcanism than the central basin, and is affected by extension with a significant sinistral strike-slip compon ent.