Magnetic sector mass spectroscopy studies of these structures by Munir Humayun have uncovered anomalously high siderophile-lithophile trace element ratios associated with them, supporting a proposition of Jason Morgan that linked them with certain surface phenomena hypothesi
Magnetic sector mass spectroscopy studies of these structures by Munir Humayun have uncovered anomalously high siderophile-lithophile trace element ratios associated with them, supporting a proposition of Jason Morgan that linked them with certain surface phenomena hypothesized by J. Tuzo Wilson.  They have an axial flow of about 5 meters per year at the 670 kilometer discontinuity, and are hypothesized to originate at a thermal boundary layer, probably the D prime prime layer.  They might explain the uplift and lateral extent of volcanism associated with continental flood basalts.  FTP, name these long conduits of thermally buoyant material which rise through the mantle, which were originally thought to be the sources of hot spots.
Magnetic sector mass spectroscopy studies of these structures by Munir Humayun have uncovered anomalously high siderophile-lithophile trace element ratios associated with them, supporting a proposition of Jason Morgan that linked them with certain surface phenomena hypothesized by J. Tuzo Wilson.  
mantle plumes