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Central and eastern Bransfield basins (Antarctica) from high-resolution swath-bathymetry data

Published online by Cambridge University Press:  07 May 2004

Eulàlia Gràcia ,
Miquel Canals ,
Marcel. Lí Farràn ,
Jordi Sorribas  and
Raimon Pallàs
Eulàlia Gràcia
Affiliation:
U.A. Geociències Marines CSIC-UB, GRQ Geociències Marines, Departament de Geologia Dinàmica, Geofísica i Paleontologia, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain
Miquel Canals
Affiliation:
U.A. Geociències Marines CSIC-UB, GRQ Geociències Marines, Departament de Geologia Dinàmica, Geofísica i Paleontologia, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain
Marcel. Lí Farràn
Affiliation:
U.A. Geociències Marines CSIC-UB, Grup Geologia Marina, Institut de Ciències del Mar (C.S.I.C.), Passeig Joan de Borbó s/n, 08039 Barcelona, Spain
Jordi Sorribas
Affiliation:
U.A. Geociències Marines CSIC-UB, GRQ Geociències Marines, Departament de Geologia Dinàmica, Geofísica i Paleontologia, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain
Raimon Pallàs
Affiliation:
U.A. Geociències Marines CSIC-UB, GRQ Geociències Marines, Departament de Geologia Dinàmica, Geofísica i Paleontologia, Facultat de Geologia, Universitat de Barcelona, 08028 Barcelona, Spain
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Abstract

For the first time complete swath bathymetric maps of central and eastern Bransfield basins are presented at a medium scale and detailed morphological descriptions are provided. Bathymetry reveals morphological structures which provide important information about the structure, volcanism, and kinematics of these basins. The central basin is dominated by two roughly orthogonal sets of extensional faults (N065° the main set and N145° the secondary set), displays several discontinuous along-axis large volcanic cones and ridges trending about N059°, and undergoes extension roughly normal to the basin. The structure of the eastern basin has a roughly rhomboidal pattern (fault sets along N053° and N103°), 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 component.

Keywords

backarcBransfield Basinmorphostructureswath-bathymetryvolcanism
Type
Papers—Earth Sciences and Glaciology
Information
Antarctic Science , Volume 9 , Issue 2 , June 1997 , pp. 168 - 180
Copyright
© Antarctic Science Ltd 1997

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