(May 4, 2013 at 7:41 pm)Chuck Wrote: The notion that mantle plume is merely a theory is not entirely correct. Direct seismic observation supports the presence of a very large deep mantle plume rising up from mantle core boundary under Africa. There are other combinations of mineralogical experiments and mineralogical observations which support the presence of plume like channels of material transport from deep in the mantle that is unique to the sites of proposed mantle plumes.
I only recount what I read in Science, AAAS one. It was the first or second April issue. If you are interested I'll look it up again. Erased it from my tablet after reading.
It was not challenging the facts you raise. It was pointing out conclusively observing the plumes has not been accomplished.
