A Maastrichtian palaeomagnetic pole for the Pacific plate from a skewness analysis of marine magnetic anomaly 32

Details A Maastrichtian palaeomagnetic pole for the Pacific plate from a skewness analysis of marine magnetic anomaly 32 A Maastrichtian palaeomagnetic pole for the Pacific plate from a skewness analysis of marine magnetic anomaly 32

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.139..227p&link_type=abstract

Geophysical Journal International, Volume 139, Issue 1, pp. 227-247.

Astronomy and Astrophysics

Astronomy

13

Anomalous Skewness, Apparent Polar Wander, Hotspots, Marine Magnetic Anomalies, Pacific Plate, Palaeomagnetic Poles

Scientific paper

The asymmetry (skewness) of marine magnetic anomaly 32 (72.1-73.3 Ma) on the Pacific plate has been analysed in order to estimate a new palaeomagnetic pole. Apparent effective remanent inclinations of the seafloor magnetization were calculated from skewness estimates of 108 crossings of anomaly 32 distributed over the entire Pacific plate and spanning a great-circle distance of ~12 000 km. The data were inverted to obtain a palaeomagnetic pole at 72.1 degN, 26.8 degE with a 95 per cent confidence ellipse having a 4.0 deg major semi-axis oriented 98 deg clockwise of north and a 1.8 deg minor semi-axis; the anomalous skewness is 14.2 deg+/-3.7 deg. The possible dependence of anomalous skewness on spreading rate was investigated with two empirical models and found to have a negligible effect on our palaeopole analysis over the range of relevant spreading half-rates, ~25 to ~90 mm yr^-1. The new pole is consistent with the northward motion for the Pacific plate indicated by coeval palaeocolatitude and palaeoequatorial data, but differs significantly from, and lies to the northeast of, coeval seamount poles. We attribute the difference to unmodelled errors in the seamount poles, mainly in the declinations. Comparison with the northward motion inferred from dated volcanoes along the Hawaiian-Emperor seamount chain indicates 13 deg of southward motion of the Hawaiian hotspot since 73 Ma. When the pole is reconstructed with the Pacific plate relative to the Pacific hotspots, it differs by 14 deg-18 deg from the position of the pole relative to the Indo-Atlantic hotspots. This has several possible explanations including bias in one or more of the palaeomagnetic poles, motion between the Pacific and Indo-Atlantic hotspots, and errors in plate reconstructions relative to the hotspots.

Affiliated with

Also associated with

No associations

Rating

A Maastrichtian palaeomagnetic pole for the Pacific plate from a skewness analysis of marine magnetic anomaly 32 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Maastrichtian palaeomagnetic pole for the Pacific plate from a skewness analysis of marine magnetic anomaly 32, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Maastrichtian palaeomagnetic pole for the Pacific plate from a skewness analysis of marine magnetic anomaly 32 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1085401