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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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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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Authors and Affiliations

  1. Departamento de Geodinámica, Univ. Granada, 18071, Granada, Spain

    J. C. Balanyá, J. Galindo-Zaldívar & A. Jabaloy

  2. Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, 18071, Granada, Spain

    A. Maldonado & J. Rodríguez-Fernández

  3. All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNII Okeangeologia), 1 Anglysky Ave., 190 121, St. Petersburg, Russia

    G. Leitchenkov

  4. State Enterprise Marine Arctic Geological Expedition (SE MAGE), 26 S. Perouskaya St., 183012, Murmansk, Russia

    O. Vinnikovskaya

Authors
  1. J. C. Balanyá
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  2. J. Galindo-Zaldívar
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  3. A. Jabaloy
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  4. G. Leitchenkov
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  5. A. Maldonado
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  6. J. Rodríguez-Fernández
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  7. O. Vinnikovskaya
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Balanyá, J.C., Galindo-Zaldívar, J., Jabaloy, A. et al. Structure of the South Powell Ridge (NE Antarctic Peninsula): new clues for changing tectonic regimes near the Scotia/Antarctica Plate boundary. Geo-Marine Letters 18, 215–224 (1998). https://doi.org/10.1007/s003670050071

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  • DOI: https://doi.org/10.1007/s003670050071

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