Open AccessA palaeomagnetic secular variation record from c. 120 000 yr‐old New Zealand cave sediments
Author(s) -
Turner Gillian M.,
Lyons Ruth G.
Publication year - 1986
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1986.tb01989.x
Subject(s) - geology , paleomagnetism , cave , clockwise , paleontology , secular variation , geomagnetic pole , earth's magnetic field , section (typography) , geophysics , archaeology , geometry , rotation (mathematics) , magnetic field , geography , physics , mathematics , quantum mechanics , advertising , business
Summary. A record of palaeomagnetic secular variations has been obtained from a 5 m section of cave sediments in New Zealand. The uppermost horizon has been dated at 120 000 yr, and the section probably spans about 10 000 yr. The mean direction of remanence is close to the field direction expected at the site from an axial geocentric dipole. In the upper part of the record the palaeomagnetic vector describes three open clockwise loops, ending in a swing to anomalously low inclinations. This swing is tentatively associated with a weakening of the main dipole field prior to the Blake geomagnetic event.