On the features of the geodynamo following reversals or excursions: by absolute geomagnetic paleointensity data

Details On the features of the geodynamo following reversals or excursions: by absolute geomagnetic paleointensity data On the features of the geodynamo following reversals or excursions: by absolute geomagnetic paleointensity data

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pepi..124...81g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 124, Issue 1-2, p. 81-93.

Physics

4

Scientific paper

We carried out a Thellier paleointensity study of a ~3.6 million year Pliocene geomagnetic excursion recorded in a lava flow succession from southern Georgia (lesser Caucasus). Previous paleomagnetic study [Phys. Earth Planet. Int. 96 (1996) 41] revealed that several consecutive lava flows record an intermediate polarity direction at the base of the section followed by a thick reverse polarity zone. Samples of 71 from 26 flows from both polarity zones were pre-selected for paleointensity experiments because of their low viscosity index, stable remanent magnetisation and close to reversible continuous thermomagnetic curves. Altogether 54 samples from 21 flows yielded reliable paleointensity estimates. The mean paleointensity of the intermediate field is /7.8+/-2.4μT (three flows). The stable polarity paleointensity is higher with a mean /24.2+/-8.2μT (15 flows), which corresponds to a mean virtual dipole moment (VDM) of 4.6+/-1.8×1022Am2. This value is significantly lower than the average Pliocene geomagnetic dipole moment and post-intermediate dipole moments recorded in volcanic sequences at Hawaii (~4Ma) and Steens mountain (~16.2Ma). However, our results are quite similar to the post-intermediate field recorded in Iceland during the Gauss-Matuyama reversal. These results suggest that the regime of the geodynamo following reversals or excursions may vary significantly from one case to the next without any apparent systematic features.

Affiliated with

Also associated with

No associations

Rating

On the features of the geodynamo following reversals or excursions: by absolute geomagnetic paleointensity data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with On the features of the geodynamo following reversals or excursions: by absolute geomagnetic paleointensity data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the features of the geodynamo following reversals or excursions: by absolute geomagnetic paleointensity data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-796006