Marine geology in the environs of Bouvet Island and the South Atlantic triple juction |
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| Authors: | G. Leonard Johnson Richard N. Hey Allen Lowrie |
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| Affiliation: | (1) U.S. Naval Oceanographic Office, 20373 Wash., D.C., USA;(2) Dept. of Geological and Geophysical Sciences, Princeton University, 08540 Princeton, N.J., USA;(3) Earth and Planet Sciences Division, Marine Biomedical Institute Univ. of Texas Medical Branch, Galveston, Texas, USA;(4) U.S. Naval Oceanographic Office, 20373 Wash., D.C., USA |
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| Abstract: | It is suggested that Bouvet Island is the surface manifestation of a mantle plume which has resulted in the creation of a chain of seamounts in the South Atlantic and a general shoaling of the region.The strike of two newly defined large fracture zones borth and south of the Bouvet Island pedestal have been utilized to determine a pole of rotation at 12.5°S, 12.5°W for the Africa-Antarctica motion. A pole at 75°S, 13°E has been calculated for the South America-Antarctica motion. At the triple junction the South America-Africa relative motion is 3.3 cm yr-1 (whole rate) at 075°. The Africa-Antarctica motion is 1.7 cm yr-1 at 065° and the South America-Antarctica motion is 1.6 cm yr-1 at 085. |
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