Does the lower mantle correlate with the upper mantle?

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Presentation transcript:

Does the lower mantle correlate with the upper mantle? Do ridges look like superplume boundaries?

News Focus: “The deep Earth machine is coming together” by R. A News Focus: “The deep Earth machine is coming together” by R. A. Kerr (5 April, p. 22). The global map was incomplete. Due to a production error, 24 of the 25 Large Igneous Provinces (LIPs) had been deleted. In the corrected map (shown here), 23 of the 25 LIPs fall near the edges of LLSVPs—the two piles of material on the bottom of the mantle—suggesting that rising plumes connect LLSVPs to volcanic centers on the surface. The image has been corrected in the HTML and PDF versions online.

Only ~3 hotspots are not near yellow/red. All LIPs backtrack to red. STATISTICS ~100% of hotspots fall in LVAs of the upper mantle, mostly those associated with ridges, & in regions of extension Range 15%; CMB range is 5%; -3% corresponds to CMB range; 25 out of 37 are in salmon (68%) 5 are outside (32 in)….26 in by recount; 7 max are out; 30 in(81%) Only ~3 hotspots are not near yellow/red. All LIPs backtrack to red.