On the reliability of Mesozoic Dipole Low: New absolute paleointensity results from Paraná Flood Basalts (Brazil)

Details On the reliability of Mesozoic Dipole Low: New absolute paleointensity results from Paraná Flood Basalts (Brazil) On the reliability of Mesozoic Dipole Low: New absolute paleointensity results from Paraná Flood Basalts (Brazil)

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29m..33g&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 13, pp. 33-1, CiteID 1655, DOI 10.1029/2002GL015242

Physics

9

Geomagnetism And Paleomagnetism: Paleointensity, Geomagnetism And Paleomagnetism: Paleomagnetic Secular Variation, Geomagnetism And Paleomagnetism: Reference Fields (Regional, Global), Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Geomagnetism And Paleomagnetism: Time Variations-Secular And Long Term

Scientific paper

Thellier paleointensity experiments were carried out on Early Cretaceous Paraná Flood Basalts. Forty-two samples from 11 lava flows yielded apparently reliable absolute intensity determinations. The mean paleointensity values per flow obtained in this study are ranging from 19.4 +/- 4.0 to 46.7 +/- 7.0 μT and the corresponding Virtual Dipole Moments are ranging from 4.0 +/- 0.6 to 10.5 +/- 1.1 (1022 Am2). These yield a mean value of 7.2 +/- 2.3 × 1022 Am2, which is about 92% of the present geomagnetic axial dipole. Our results in conjunction with Tarduno et al.'s [2001] data suggest that the paleostrength during early Cretaceous period might be comparable or even much higher than recent field intensity and not `anomalousely low' as previously suggested. Thus, the Mesozoic Dipole Low (MDL) may probably be considered as unreliable.

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