Open AccessPaleomagnetic results from the Newer Volcanics of Victoria: Contribution to the Time Averaged Field Initiative
Author(s) -
Opdyke Neil D.,
Musgrave Robert
Publication year - 2004
Publication title -
geochemistry, geophysics, geosystems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.928
H-Index - 136
ISSN - 1525-2027
DOI - 10.1029/2003gc000632
Subject(s) - paleomagnetism , geology , demagnetizing field , volcanic rock , latitude , volcano , seismology , geodesy , paleontology , magnetic field , physics , magnetization , quantum mechanics
The Newer Volcanics of Victoria Australia were sampled in 2001 and 2003 as part of the Time Averaged Field Initiative which is designed to provide a reliable data set for modeling the Earth's magnetic field over the past 5 My. The collection consisted of ten cores per site at 42 sites. Complete demagnetization was carried out on all samples using AF or thermal demagnetization and line fitting techniques were employed to determine the resultant vector. Thirty‐two of these sites gave results that met the criterion that N ≥ 5, and α 95 was less than 6°. 20 sites were reversely magnetized, Dec = 173.4°, Inc. = 54.6°, α 95 = 3.8° and 13 normally magnetized, Dec = 2.1°, Inc = −62.3°, α 95 = 6.3°. The data gave a global mean paleomagnetic pole (lat. 87.2°, long. 21.9° and A 95 = 4.4°) which is not significantly different from the pole of rotation for the present location of Victoria and for its latitude 2.5 million years ago when most of the lavas were erupted.