Abstract
An improved Gondwanaland reconstruction compatible with geological and geophysical information from the surrounding oceans and continents seems to require microplates to solve the enigmatic pre-early-Mesozoic tectonic relation between West and East Antarctica1. New multi-channel seismic reflection data from the southeastern Weddell Sea acquired during the 1984–85 Norwegian Antarctic Research Expedition (NARE) have outlined a linear WSW–ENE-trending basement ridge buried below the continental slope over a distance of 700 km. This structural high truncates the trend of the large sedimentary basins below the Filchner and Ronne ice shelves and may continue to within a few hundred kilometres of the Antarctic Penninsula. We interpret the basement ridge as part of the East Antarctic plate boundary during the break-up of Gondwana. The morphology and structure of this boundary show greater apparent similarity to a rifted or obliquely rifted margin than to the sheared margin which is predicted by current reconstructions2,3. A linear East Antarctic plate margin extending to the vicinity of the Antarctic Peninsula makes any post-rift micro-plate motion in the Weddell Embayment unlikely.
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References
Dalziel, I. W. D. & Elliot, D. Tectonics 1, 3–19 (1982).
Norton, I. O. & Sclater, J. G. J. geophys. Res. 84, 6803–6830 (1979).
Lawver, L. A., Sclater, J. G. & Meinke, L. Tectonophysics 114, 233–255 (1985).
Hinz, K. & Krause, W. Geol. Jb. 23, 17–41 (1982).
Masolov, V. N. in Geophysical Investigations in Antarctica, 16–28 (NIIGA, Leningrad, 1980; transl. from Russian).
Barker, P. F. & Jahn, R. A. Geophys. J. R. astr. Soc. 63, 271–283 (1980).
Haugland, K., Kristoffersen, Y. & Velde, A. Tectonophysics 114, 293–315 (1985).
LaBrecque, J. L. & Barker, P. F. Nature 290, 489–492 (1981).
Sandwell, D. T. J. geophys. Res. 89, 11401–11413 (1984).
Rabinowitz, P. D. & LaBrecque, J. L. J. geophys. Res. 84, 5973–6002 (1979).
Sibuet, J. G. & Mascle, J. J. geophys. Res. 83, 3401–3421 (1978).
Mutter, J. C. Tectonophysics 114, 117–131 (1985).
Hjelle, A. & Winsnes, T. in Antarctic Geology and Geophysics 539–547 (Universitets forlaget, Oslo, 1972).
Furnes, H. & Mitchell, J. G. Norsk Polarinst. Skr. 169, 45–68 (1978).
Spaeth, G. in Proc. 6th Gondwana Symp., Columbus, Ohio (American Geophysics Union, in the press).
Elliot, D. in Antarctic Earth Science, 347–351 (Cambridge University Press, 1983).
Grikurov, G. et al. in Geophysical Investigations in Antarctica, 29–43 (NIIGA, Leningrad, 1980; trans. from Russian).
Miller, H., Lippmann, E. & Kallerhoff, W. Rep. Pol. Res. 19, 116–129 (1984).
Rowley, P. D. et al. in Antarctic Earth Science 245–250 (Cambridge University Press, 1983).
Meneilly, A. W., Harrison, S. M., Piercy, B. A. & Storey, B. C. in Proc. 6th Gondwana Symp. (American Geophysical Union, in the press).
Drewry, D. J. in Antarctica: Glaciological and Geophysical Folio 2 (Scott Polar Research Institute, Cambridge, 1983).
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Kristoffersen, Y., Haugland, K. Geophysical evidence for the East Antarctic plate boundary in the Weddell Sea. Nature 322, 538–541 (1986). https://doi.org/10.1038/322538a0
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DOI: https://doi.org/10.1038/322538a0
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