Sea-floor spreading rate changes in the South Atlantic |
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| Authors: | Timothy P Loomis W Jason Morgan |
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| Institution: | (1) Dept. of Geological and Geophysical Sciences, Princeton University, 08540 Princeton, N.J., USA;(2) Department of Geology and Geophysics, Yale University New Haven, 06520, Conn, USA |
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| Abstract: | A computer correlation technique was used to deduce the spreading history of the Mid-Atlantic Ridge from 5 magnetic profiles between 28°S and 43°S. In general, several possible histories are indicated for each profile involving changes of spreading rate and faulting, some of which are easily overlooked by the visual method. The only spreading history that was consistent will all the profiles required spreading at approximately 2.2 cm yr-1 from 11 m.y.b.p. to approximately 5.5 m.y.b.p., followed by a decrease in rate to 1.7 cm yr-1 relative to the Vine (1966) magnetic reversal model based on the South Pacific. Comparison of the data with other reported spreading rate discontinuities suggests that the South Pacific may be reponsible for the reported spreading rate changes. |
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