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| Detailed Reference Information |
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Laj, C., Guillou, H., Szeremeta, N. and Coe, R. (1999). Geomagnetic paleosecular variation at Hawaii around 3 Ma from a sequence of 107 lava flows at Kaena Point (Oahu). Earth and Planetary Science Letters 170(4): 365-376. doi: 10.1016/S0012-821X(99)00119-3. |
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We have sampled a sequence of 107 lava flows in the Waianae series on Oahu, Hawaii, in two separate stretches. The first (51 flows) at Kaena Point extends from sea level to an altitude of 190 m, and the second (56 flows) follows the Satellite Tracking Station road from 218 m to 360 m above sea level. Thermal and af demagnetization yield very similar results, and reveal only normal polarities. K/Ar dating at five different horizons combined with the paleomagnetic results indicate that the sequence was emplaced entirely in the normal polarity interval between the Upper Mammoth and the Lower Kaena polarity transitions (3.22-3.11 Ma). Some of the flows are serially correlated. Filtering does not, however, drastically affect the final results. Inclinations are shallower than those expected from a centered dipole field. Although large (similar to 13 degrees), the inclination anomaly is consistent with results from other sites at the same latitude. The scatter of the VGPs about the geographic pole is consistent with available data from other regions at similar latitudes. The scatter of the directions is also consistent with the predictions of recent statistical models of paleosecular variation. Therefore, these results do not support the hypothesis of a Pacific dipole window. (C) 1999 Elsevier Science B.V. All rights reserved. |
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Abstract |
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Table 1 |
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Table 2A |
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Table 2B |
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Setting & Sampling |
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K/ar Dating |
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Rock Magnetic Analysis |
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Demagnetization of the NRM |
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Paleosecular Variations |
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Keywords
magnetic field, secular variations, k/ar, absolute age, hawaii, palaeosecular variation, paleointensity, pleistocene, reversals, potassium, waianae, field, time |
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Publisher
Elsevier Science
P.O. Box 211
1000 AE Amsterdam
The Netherlands
(+31) 20 485 3757
(+31) 20 485 3432
nlinfo-f@elsevier.com |
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