Evidence for recent palaeomagnetic secular variation in lake sediments from the New Guinea Highlands |
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| Authors: | R Thompson F Oldfield |
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| Institution: | 1. Department of Geophysics, University of Edinburgh, Edinburgh Great Britain;2. Department of Geography, University of Liverpool, Liverpool Great Britain |
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| Abstract: | Palaeomagnetic declination and inclination data are reported from Mackereth mini cores taken from three lake sites in Papua New Guinea. 137Cs, 210Pb and 14C dating provide a timescale for the palaeomagnetic oscillations. Tephrastratigraphy aids correlation between lakes. The palaeomagnetic data resemble the geomagnetic secular variation pattern deduced from historical observations. The new results greatly extend the latitudinal coverage of palaeomagnetic secular variation recorded in the last 104 yr. Their significance in assessing secular variation source models is discussed. The data suggest that the edge of the Pacific region of low non-dipole field activity has remained near New Guinea during the last 104 yr. |
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