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http://dspace.mediu.edu.my:8181/xmlui/handle/10261/4775| Title: | Geomagnetic paleosecular variation in the Brunhes period, from the island of El Hierro (Canary Islands) |
| Authors: | Centre National de la Recherche Scientifique (France) Institut national des sciences de l'Univers (France) North Atlantic Treaty Organization Consejo Superior de Investigaciones Científicas (España) |
| Keywords: | Secular variations Magnetic field Absolute age Canary Islands |
| Publisher: | Elsevier |
| Description: | 13 pages, 9 figures, 3 tables.-- Printed version published Frb 15, 1999. We have sampled a sequence of 69 flows in the island of El Hierro (Canary Islands). 46 of them belong to the El Golfo formation and 23 to the most recent rift formation. Radiometric dating brackets this section between 442 ka and 134 ka with six intermediate datings. All the samples were stepwise demagnetized, partly with alternative field, partly thermally with very similar results. The large majority of the samples are characterized by a single stable component of magnetization. ChRM isolated after the first steps of demagnetization are all of normal polarity. Inclinations are on average shallower than expected from a geocentered dipole field, but consistent with results from other areas at the same latitude. Mean declinations of the rift and El Golfo sequences are both easterly deviated (about 5° and 15° respectively) and significantly different suggesting that the section has undergone a progressive clockwise rotation. VGP scatter and directional scatter calculated for the rift sequence are consistent with available data from other geographical areas, and also with recent models of paleosecular variation. On the other hand, a significantly smaller directional scatter is obtained for the lower El Golfo sequence, suggesting that a period of low secular variation occurred in the Canary Islands area between approximately 440 and 260 ka. This work was supported in France by the CEA and the CNRS, and in Spain by the CSIC. The authors also gratefully acknowledge financial help for the field trips by NATO Grant N°CRG 940609. The PhD grant for N.S. was given by the CEA. Peer reviewed |
| URI: | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/4775 |
| Other Identifiers: | Earth and Planetary Science Letters 165(3-4): 241-253 (1999) 0012-821X http://hdl.handle.net/10261/4775 10.1016/S0012-821X(98)00270-2 |
| Appears in Collections: | Digital Csic |
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