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Structure of the South Powell Ridge (NE Antarctic Peninsula): new clues for changing tectonic regimes near the Scotia/Antarctica Plate boundary |
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| Authors: | Balanyá J C Galindo-Zaldívar J Jabaloy A Leitchenkov G Maldonado A Rodríguez-Fernández J Vinnikovskaya O |
| Institution: | 1.Departamento de Geodinámica, Univ. Granada, 18071, Granada, Spain ;2.Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, 18071, Granada, Spain ;3.All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNII Okeangeologia), 1 Anglysky Ave., 190 121, St. Petersburg, Russia ;4.State Enterprise Marine Arctic Geological Expedition (SE MAGE), 26 S. Perouskaya St., 183012, Murmansk, Russia ; |
| Abstract: | The structure of the South Powell Ridge (SPR), separating the Late Cenozoic ocean-floored Powell Basin and the Mesozoic Weddell Sea domain, is revealed by multichannel seismic data. The SPR appears as a basement high, bounded northward by transtensional faults and by normal and major reverse faults to the south. These margin features seem to be linked to the Powell Basin southern strike-slip margin and to the Jane Arc paleotrench, respectively. We suggest the ridge evolved from the Antarctic Peninsula passive margin to become the deformational front of the Scotia/Antarctica Plate boundary, later being welded to the Antarctic Plate. |
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