Geomagnetic paleosecular variation in Easter Island, the southeast Pacific

Physics

Scientific paper

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Scientific paper

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°N and 239.1°E with a 95% confidence value of 3.8°. The angular dispersion value of Easter Island VGPs was calculated to be 11.8° with an upper limit of 14.1° and a lower limit of 9.8°. 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.

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