RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 8, ES1004, doi:10.2205/2006ES000191, 2006

Paleointensity

[5]  The results of determining paleointensity using the Thellier, Wilson-Burakov, van-Zijl, and Shaw methods [Khramov et al., 1982; Merrill and McElhinny, 1983] and the dipole magnetic moments calculated on its basis are collected in the database and generalized. The authors of the latest generalization [Shcherbakov et al., 2002] used only the most reliable determinations, performed using the Thellier method and its modifications. These data suggest that in the time interval of 330-280 Ma the paleointensity of the magnetic field was high and then declined abruptly (averagely two times) and remained as such up to the time of 200 Ma. It follows that the P/T boundary, and hence the peak of the igneous activity of the Siberian traps (251 Ma) fell into the interval of low paleointensity values [Shcherbakov et al., 2002], and were not fixed in the paleointensity. Yet, the data available are not sufficient to judge about the fine details of the global paleointensity behavior and, especially, about its local specific features. It should be emphasized that the paleointensity decline and the high growth of paleointensity variations was dated 280 Ma, that is, earlier than the boundary between the Kiama reversed polarity hyperchron (steady-state field) and the hyperchron Illawara of the frequent changes of the polarity (unstable state of the field), which has been dated 265 Ma.


RJES

Citation: Pechersky, D. M. (2006), Geomagnetic field in the vicinity of the Paleozoic-Mesozoic boundary and the Siberian superplume, Russ. J. Earth Sci., 8, ES1004, doi:10.2205/2006ES000191.

Copyright 2006 by the Russian Journal of Earth Sciences

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