Paleomagnetism and radiochemical age estimates for Late Brunhes polarity episodes |
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| Authors: | Charles R Denham Robert F Anderson Michael P Bacon |
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| Institution: | 1. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Mass 02543USA;2. Department of Chemistry, Woods Hole Oceanographic Institution, Woods Hole, Mass 02543USA |
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| Abstract: | Several reversed polarity magnetozones occur within deep-sea sediment core CH57-8 from the Greater Antilles Outer Ridge, within sediment of latest Pleistocene/Late Brunhes age. The uppermost reversed interval spanning 31 data points coincides with the X faunal zone of the Last Interglacial Period. Radiochemical dating of cores CH57-8 and KN25-4 has shown that all the reversed polarity magnetozones are significantly younger than the Brunhes/Matuyama boundary at 0.7 m.y. B.P. A variation of the excess230Th method was used, in which210Po and238U were the actual radionuclides measured. In a third core from the Mid-Atlantic Ridge, our210Po results were similar to those which others obtained earlier by direct230Th measurements. |
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