RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 8, ES1002, doi:10.2205/2005ES000185, 2006
[95] 2. The comparison of the trap-type paleomagnetic pole of the Siberian Platform with the average pole of "Stable" Europe revealed a significant difference between them.
[96] 3. This difference cannot be explained by the movement of the Siberian Platform relative to Europe during the post-Paleozoic time.
[97] 4. The observed difference between the average poles of Europe and Siberia can be explained by the following reasons:
[98] (a) the significant presence of non-dipole components in the geomagnetic field at the boundary between the Paleozoic and Mesozoic. As follows from our estimates the distance between these poles has a minimum value in the case the negative 10% contribution of the octupolar component, and/or
[99] (b) the shallowing of magnetic inclination in the sedimentary rocks, most of which were taken into account during the computation of the average pole of "Stable" Europe. The best convergence of the poles was found using the shallowing factor f equal to 0.62.
[100] 5. The data available are not sufficient to derive a final conclusion, namely, which of the potential explanations of the difference between the poles is correct: the inclination or the significant contribution of non-dipole components. However, since our calculations show that the observed difference between the poles becomes statistically insignificant if we assume a very low but quite real value of inclination shallowing ( f = 0.9-0.95), we believe that currently the hypothesis of the underestimation of inclination in the European data can be regarded as the most probable one.
Citation: 2006), New paleomagnetic data for the Permian-Triassic Trap rocks of Siberia and the problem of a non-dipole geomagnetic field at the Paleozoic-Mesozoic boundary, Russ. J. Earth Sci., 8, ES1002, doi:10.2205/2005ES000185.
Copyright 2006 by the Russian Journal of Earth Sciences (Powered by TeXWeb (Win32, v.2.0).