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: | J C Balanyá J Galindo-Zaldívar A Jabaloy G Leitchenkov A Maldonado J Rodríguez-Fernández and O Vinnikovskaya |
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| Institution: | (1) Departamento de Geodinámica, Univ. Granada, 18071 Granada, Spain, ES;(2) Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, 18071 Granada, Spain, ES;(3) All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNII Okeangeologia), 1 Anglysky Ave., 190 121 St. Petersburg, Russia, RU;(4) State Enterprise Marine Arctic Geological Expedition (SE MAGE), 26 S. Perouskaya St., 183012 Murmansk, Russia, RU |
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| 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.
Received: 18 August 1997 / Revision received: 4 May 1998 |
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