A geophysical transect of the Adélie Margin,East Antarctica |
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| Authors: | Jacques Wannesson Monique Pelras Bernard Petitperrin Martine Perret Jacques Segoufin |
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| Institution: | Institut Français du Pétrole, BP 311, 92506 Rueil-Malmaison Cedex, France;Société Nationale Elf-Aquitaine (Production) — Tour Générale, La Défense 9, Cedex 22, 92088 Paris La Défense, France;Compagnie Française des Pétroles — Tour Mirabeau, 39–43 quai A. Citroën, 75739 Paris Cedex 05, France;Institut de Physique du Globe — Université P. et M. Curie, 4 place Jussieu 75230 Paris Cedex 05, France |
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| Abstract: | In 1982, a geophysical survey of the Antarctic margin, including multichannel seismic, gravity, magnetic and bathymetric surveying, was carried out off Adélie Coast-Wilkes Land and in the eastern Ross Sea. Of the 5000 km of lines recorded, 3000 km were in the Adélie Coast area. Lines ATC 101–102, approximately following meridian 138°E, show the first complete transect of the Adélie Coast margin from the Southeast Indian abyssal plain at DSDP Site 269 to the continental shelf. These lines reveal a thick sedimentary series divided into three main acoustic units by two major unconformities considered to be Upper Eocene (42 Ma) and late Oligocene (25 Ma). Oceanic or continental basement can be traced under the whole area, and the ocean-continent boundary clearly lies beneath the lower continental slope. A deep, high-amplitude, low-frequency horizon, extending under the oceanic basement for over 300 km of line, is considered to be the Moho. Our interpretation supports a recent revision be Cande and Mutter proposing an early Upper Cretaceous opening between Australia and East Antarctica. |
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| Keywords: | Antarctic margin Magnetic anomolies Breakup Acoustic sequences |
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