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Geophys. J. Int. (1994) 118, 529-554 A 57 Ma Pacific plate palaeomagnetic pole determined

Summary: Geophys. J. Int. (1994) 118, 529-554
A 57 Ma Pacific plate palaeomagnetic pole determined
from a skewness analysis of crossings of marine magnetic anomaly 25r
Katerina E. Petronotis,l.* Richard G. Gordon2*?and Gary D. Acton'y"
'Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA
Laboratoire de Giodynamique Sous-Marine, BP 48, 06230 Villefranche sur Mer, France
Accepted 1994 January 26. Received 1994 January 25; in original form 1993June 3
An increase in the accuracy and age resolution of the apparent polar wander path
of the Pacific plate could be important for testing reconstructions that relate the
motion of Pacific basin plates to other plates, for testing if hotspots in different ocean
basins are stationary relative to one another, and for estimating the motion of
hotspots relative to the spin axis. With these goals in mind, herein we investigate
how accurately a palaeomagnetic pole can be estimated from skewness analysis of
many crossings of a single magnetic anomaly on the Pacific plate. Apparent effective
remanent inclinations of the sea-floor magnetization were estimated from the
skewnesses of 132 useful (out of 149 total) crossings of anomaly 25r (56.5-57.8 Ma)
distributed over a distance of more than 11OOO km across the Pacific plate. These
estimates were inverted to obtain a best-fitting palaeomagnetic pole latitude, pole
longitude, and anomalous skewness for this single reversed-polarity chron. The


Source: Acton, Gary - Department of Geology, University of California, Davis


Collections: Geosciences