Reference frames for plate tectonics and uncertainties

Donna M Jurdy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Paleomagnetic, hotspot, and mean-lithosphere frameworks are compared for the Cenozoic Era. Errors in the relative motions of plate pairs accumulate to give uncertainties in reference frames. Uncertainties in the poles of the mean-lithosphere framework are estimated to be less than 1° and for the hotspot framework 1.1°, assuming a 50 km error in location of individual hotspots. The A95's for paleomagnetic data range from 1° to 5°. With these uncertainties the differences between the paleomagnetic and mean-lithosphere coordinate systems are not found to be statistically significant, and the hotspot frame barely differs from the mean-lithosphere frame during the early Tertiary. On the other hand, the hotspot and paleomagnetic axes diverge in opposing directions in the mean-lithosphere framework, and can be distinguished. This difference can be attributed to the Pacific hotspots having more than 10° motion relative to the mean-lithosphere, whereas the African set of hotspots does not statistically differ from the mean-lithosphere frame. One possible explanation is a shift of the Pacific hotspots relative to those in the Atlantic.

Original languageEnglish (US)
Pages (from-to)373-382
Number of pages10
JournalTectonophysics
Volume182
Issue number3-4
DOIs
StatePublished - Oct 20 1990

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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