Three distinct types of hotspots in the Earth's mantle

Details Three distinct types of hotspots in the Earth's mantle Three distinct types of hotspots in the Earth's mantle

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.205..295c&link_type=abstract

Earth and Planetary Science Letters, Volume 205, Issue 3-4, p. 295-308.

Physics

153

Hotspots, Mantle Plumes, Convection, True Polar Wander

Scientific paper

The origin of mantle hotspots is a controversial topic. Only seven (`primary') out of 49 hotspots meet criteria aimed at detecting a very deep origin (three in the Pacific, four in the Indo-Atlantic hemisphere). In each hemisphere these move slowly, whereas there has been up to 50 mm/a motion between the two hemispheres prior to 50 Ma ago. This correlates with latitudinal shifts in the Hawaiian and Reunion hotspots, and with a change in true polar wander. We propose that hotspots may come from distinct mantle boundary layers, and that the primary ones trace shifts in quadrupolar convection in the lower mantle.

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