Diese Seite ist aus Gründen der Barrierefreiheit optimiert für aktuelle Browser. Sollten Sie einen älteren Browser verwenden, kann es zu Einschränkungen der Darstellung und Benutzbarkeit der Website kommen!
Geophysics Homepage
Search:
Log in
print

A reversal of the Earth's magnetic field recorded in mid-Miocene lava flows of Gran Canaria; paleodirections

Leonhardt, R., J. Matzka, F. Hufenbecher, H. C. Soffel, and F. Heider (2002), A reversal of the Earth's magnetic field recorded in mid-Miocene lava flows of Gran Canaria; paleodirections, Journal of Geophysical Research, B, Solid Earth and Planets, 107(1), 12, doi:10.1029/2001JB000322.

Abstract
[1] A paleomagnetic investigation has been carried out on a continuous series of 87 volcanic lava flows from the mid-Miocene shield basalts of Gran Canaria. The sequence covers a reversal of the Earth's magnetic field from reverse to normal. Intermediate directions of the field are recorded in 34 lava flows. During the reversal the virtual geomagnetic poles (VGPs) show an accumulation in three consecutive areas: southeast of South America, east of India, and in the central Pacific. In addition to the reversal three excursions are recorded in the sequence, two preceding and one succeeding the reversal. The intermediate directions of the excursion just before and after the transition have the same VGP positions as the first and the last accumulation zone, respectively. From radiometric age constraints this transition corresponds very likely to a similar to 14.1 Ma field reversal. The remarkable returns to the same transitional positions near South America and the central Pacific indicate preferred locations of the VGP during the transitional stages. Only the South America cluster can be correlated to VGP clusters observed in other reversals of the last 10 Myr and to lower mantle seismic anomalies. The VGPs in the Pacific track instead along the antipode of the site longitude. This indicates that mechanisms other than lower mantle heterogeneities additionally affect the transitional record of the sampled sequence and zonal harmonics are plausible candidates.
BibTeX
@article{id165,
  author = {R. Leonhardt and J. Matzka and F. Hufenbecher and H. C. Soffel and F. Heider},
  journal = {Journal of Geophysical Research, B, Solid Earth and Planets},
  number = {1},
  pages = {12},
  title = {{A reversal of the Earth's magnetic field recorded in mid-Miocene lava flows of Gran Canaria; paleodirections}},
  volume = {107},
  year = {2002},
  language = {en},
  doi = {10.1029/2001JB000322},
}
EndNote
%0 Journal Article
%A Leonhardt, R.
%A Matzka, J.
%A Hufenbecher, F.
%A Soffel, H. C.
%A Heider, F.
%D 2002
%N 1
%V 107
%J Journal of Geophysical Research, B, Solid Earth and Planets
%P 12
%T A reversal of the Earth's magnetic field recorded in mid-Miocene lava flows of Gran Canaria; paleodirections
ImprintPrivacy PolicyContact
Printed 12. Dec 2019 07:39