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Miki et al. 1998

Miki, M., Inokuchi, H., Yamaguchi, S., Matsuda, J., Nagao, K., Isezaki, N. and Yaskawa, K. (1998). Geomagnetic paleosecular variation in Easter Island, the southeast Pacific. Physics of the Earth and Planetary Interiors 106(1-2): 93-101. doi: 10.1016/S0031-9201(97)00106-4.

We collected more than 250 samples from 45 sites in lava flows of the three volcanoes on Easter Island. The K-Ar whole rock dating was attempted on 13 sites. All of the ages obtained are younger than 0.8 Ma. Reliable paleomagnetic directions were obtained from 34 sites. The mean VGP position is 89.2 degrees N and 239.1 degrees E with a 95% confidence value of 3.8 degrees. The angular dispersion value of Easter Island VGPs was calculated to be 11.8 degrees with an upper limit of 14.1 degrees and a lower limit of 9.8 degrees. The angular dispersion value is significantly lower than the values predicted by the theoretical secular variation models. The pacific dipole window appears to exist also in the southeast Pacific. (C) 1998 Published by Elsevier Science B.V.

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Keywords
geomagnetic paleosecular variation, easter island, k-ar rock dating, secular variation, geochronology, basalts, field

Journal
Physics of the Earth and Planetary Interiors
http://www.elsevier.com/locate/pepi

Publisher
Elsevier Science
P.O. Box 211
1000 AE Amsterdam
The Netherlands
(+31) 20 485 3757
(+31) 20 485 3432
nlinfo-f@elsevier.com