The paleomagnetism of cretaceous rocks from Israel

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Scientific paper

The original directions of magnetization of oriented samples from two extensive lava fields in Israel, one of Lower and one of Upper Cretaceous age, show considerable scatter (K⋍ 2) that is reduced appreciably upon AC magnetic cleaning (K⋍ 50). The resulting pole positions are: 105.8E, 59.5N for Lower Cretaceous and 95.8E, 41.64N for Upper Cretaceous.Since azimuthal errors in the field orientations were suspected, a statistical model is proposed in which the declination and inclination have independent Gaussian distributions. Correlation coefficients regressions, and confidence intervals computed from the above data show that the proposed statistical model is reasonable for one volcanic unit, but does not seem appreciably different from Fisherian statistics for the second. The statistical results indicate a marked change in confidence limits by use of the bivariate model thus indicating the inadequacy of the Fisher statistics for some paleomagnetic purposes.

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