User:Losgrinch30/sandbox

The current leading hypothesis for the LLSVPs is the accumulation of the lithospheric subducted oceanic slab. This correspond with the locations of known slab graveyards surrounding the Pacific LLSVP. These graveyards are thought to be the reason for the high velocity zone anomalies surrounding the Pacific LLSVP that is thought to have formed by seduction zones that were around long before for the dispersion of the supercontinent Rodinia. Aided by the phase transformation, the temperature would partially melt the slabs, to form a dense heavy melt that pools and forms the ULVZ structures at the bottom of the CMB closer to the LLSVP than the slab graveyards. The rest of the material is then upswept due to chemical buoyancy contributing to the high levels of Basalt found at the MOR. The resulting motion forms small clusters of small plumes right above the CMB that combine to form larger plumes and then contribute to superplumes. The Pacific and African LLSVP, in this scenario, are originally created by a discharge of heat from the core(4000K) to the much colder mantle(2000K), the recycled lithosphere is only fuel that helps drive the superplume convection. Since it would be difficult for the Earth's core to maintain this high heat by itself, it gives support for radiogenic elements in the core, as well as the indication that if fertile subducted lithosphere stops subducting in locations preferable for superplume consumption, it will mark the demise of that superplume.

I hope this counts towards the tutorial.