Stability of the Earth with respect to the spin axis for the last 130 million years

Details Stability of the Earth with respect to the spin axis for the last 130 million years Stability of the Earth with respect to the spin axis for the last 130 million years

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.184..549t&link_type=abstract

Earth and Planetary Science Letters, Volume 184, Issue 2, p. 549-553.

Physics

18

Scientific paper

Recently continental paleomagnetic data rotated into a hotspot reference frame have been used to suggest the Earth rotated 18° with respect to the spin axis at 110 Ma. We test this true polar wander (TPW) hypothesis using paleomagnetic data from widespread granitic rocks of cratonal North America. These data conflict with TPW predictions leading to rejection of the hypothesis. The calculated polar displacement is instead consistent with motion of the Atlantic hotspots during the mid-Cretaceous. This analysis suggests that the time-averaged position of the spin axis has deviated by no more than ~5° over the last 130 million yr, indicating that mantle mass heterogeneities have not changed rapidly enough to drive TPW.

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