Lots of concepts were discussed and we saw nothing, as in this post, from you.
I have speculated that in the different nature past, the continents moved fast to get where they are today. It is likely that no great heat in that nature was produced as it would be now due to friction and etc. I have also deduced that the final phase of the movement did produce a lot of heat, because the final phase would have been in this nature. (with the nature change being the mechanism for the rapid drift) This would likely all mean that the hot spots we have, as well as most volcanism and heat under the earth would be due to this event. (not some imagined hot center of the earth)
Looking at news today I see that this scenario fits the evidence.
"In the new study, reported in the journal
Nature Geosciences, Liu and graduate students Quan Zhou and Jiashun Hu used a technique called seismic tomography to peer deep into the subsurface of the western U.S. and piece together the geologic history behind the volcanism. Using supercomputers, the team ran different tectonic scenarios to observe a range of possible geologic histories for the western U.S. over the past 20 million years. The
effort yielded little support for the traditional mantle plume hypothesis."
..."It appears that the mantle plume under the western U.S. is sinking deeper into Earth through time, which seems counterintuitive," Liu said. "This suggests that
something closer to the surface -- an oceanic slab originating from the western tectonic boundary -- is interfering with the rise of the plume."
https://www.sciencedaily.com/releases/2017/12/171218120327.htm
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