An experimental evaluation of Shaw's paleointensity method and its modifications using Late Quaternary basalts

Physics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

2

Scientific paper

Absolute paleointensity experiments were carried out using Shaw's method [Geophys. J. Res. Astr. Soc. 39 (1974) 133] and its modifications [Geophys. J. Res. Astr. Soc. 54 (1978) 241; Geophys. J. Int. 80 (1985) 773; Geophys. J. Int. 118 (1994) 781] on 49 samples belonging to six Late Quaternary basaltic flows from central Mexico. Samples were selected from a large collection because of their low viscosity index, stable remanent magnetization and close to reversible continuous thermomagnetic curves. Moreover, they previously yielded high quality Thellier paleointensity results, which makes them good candidates to assess the reliability of Shaw's paleointensity method. Only 13 samples yielded acceptable results using Shaw's original method (ARM2/ARM1 ratio varies from 0.95 to 1.05 for accepted determinations) although 6 samples do not pass the validity test proposed by Tsunakawa and Shaw [Geophys. J. Int. 118 (1994) 781] and thus should be rejected for paleointensity analyses. Rolph and Shaw's [Geophys. J. Int. 80 (1985) 773] method gives reliable determination only in one case and no single determination was obtained by Kono's [Geophys. J. Res. Astr. Soc. 54 (1978) 241] modification. Our results indicate an extremely low success rate of Shaw's paleointensity method, which may be due to magneto-chemical changes that occurred during heating of samples above their Curie temperatures.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

An experimental evaluation of Shaw's paleointensity method and its modifications using Late Quaternary basalts 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 An experimental evaluation of Shaw's paleointensity method and its modifications using Late Quaternary basalts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An experimental evaluation of Shaw's paleointensity method and its modifications using Late Quaternary basalts will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1534699

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.