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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 47 (1963)

Issue: 2. (February)

First Page: 362

Last Page: 362

Title: Structure of the Argentine Continental Margin: ABSTRACT

Author(s): W. J. Ludwig, John I. Ewing, Maurice Ewing

Article Type: Meeting abstract


Long lines of end-to-end seismic refraction profiles, shot parallel with the coast line, have defined several major sediment-filled depressions on the Argentine continental shelf. Two large elongate depressions which trend perpendicular to the coast and extend out to the edge of the continental shelf in the Province of Buenos Aires, are the only ones presently known. Extensions of land basins exhibiting a similar seismic sequence of layers were found to close on the continental shelf in the Golfo San Jorge, Magellan Straits, and Tierra del Fuego regions.

The section of shelf lying between the Province of Buenos Aires and Tierra del Fuego exhibits a marked lithologic change from that to the north and south. Undoubtedly the northern Patagonian Mesozoics extend well out onto the continental shelf in this region and may be part of the seaward extension of the central craton of Argentina. The basins, therefore, are associated with the evolution of a central craton, a dominant continental mass of enormous proportions which has influenced the geologic history of Argentina.

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