FIGURE 2. Inferred track of the Great Meteor hotspot.

From the following article:

Seismic evidence for convection-driven motion of the North American plate

David W. Eaton & Andrew Frederiksen

Nature 446, 428-431(22 March 2007)



Track is superimposed on shear-wave velocity perturbation at a depth of 200 km from model NA04 (ref. 6). Blue colours in the map indicate high-velocity regions associated with the mantle keel beneath North America. Numbers inside white rectangles are ages in Myr (mean plusminus standard deviations) of surface features along the track17,27,30. The dashed white line shows the projected position of the Great Meteor hotspot (present location 27° E, 26° N) based on a recent plate-reconstruction model24. The projected track has been rotated by 27.2° about a pole at 138.8° E, 13.4° S to minimize the least-squares misfit to the Bear (B) and Nashville (N) seamounts (103 and 82 Myr, respectively). It agrees well with the position of an elongate low-velocity anomaly in the Great Lakes region ('divot'), but is misaligned with the surface expression of the track. The upper inset shows the offset of the centroid location of the Monteregian and White Mountain igneous provinces, relative to coeval points on the projected track (dotted line with circles). Black arrows show displacement for maximum (solid) and mean (dashed) emplacement ages; grey bars show seismic fast-axis directions29. The inset region is indicated by the dashed rectangle in the main figure.