On the intensity of the paleomagnetic field between 100 million and 2500 million years ago

Details On the intensity of the paleomagnetic field between 100 million and 2500 million years ago On the intensity of the paleomagnetic field between 100 million and 2500 million years ago

Jan 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968pepi....1..122s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 1, Issue 2, p. 122-128.

Physics

6

Scientific paper

The thermal decay of the natural remanent magnetization was compared with the acquisition of thermoremanent magnetization in a field of 0.49 Oe for 41 samples of igneous rocks. The radiometric ages of these rocks are between 100 m.y. and 2500 m.y. Both the low and high stability components of the natural remanence of most of the samples are complex. However for 25 samples, at least the component of intermediate stability against heating is interpreted to be of the thermoremanent type. The data obtained after heating to at least four successive temperatures in the intermediate temperature range were used to calculate the field strength at the contemporary magnetic equator. The results of these calculations tentatively suggest that the equatorial paleomagnetic intensity 1) decreased between 200 m.y. and 100 m.y. ago, 2) increased between 600 m.y. and 200 m.y. ago, and 3) ranged between limits of 0.2 and 0.9 Oe with an average of approximately 0.45 Oe for the rest of the Precambrian era investigated in this preliminary study. The Precambrian results tend to suggest a high and low equatorial field strength respectively 1100 m.y. and 1400 m.y. ago.

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