mantle plume


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Related to mantle plume: rift valley

mantle plume

n
(Geological Science) another name for plume6
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While the older islands have disappeared below the sea as they moved away from the mantle plume, the youngest islands, Isabela and Fernandina, are still being formed.
They were using computer simulations to see how the geology of the western United States may have evolved over the last 20 million years and found "little support for the traditional mantle plume hypothesis," according to the (https://news.
A volcano forms on a tectonic plate above a mantle plume.
Scientists have seismic evidence that the deep part of the mantle is a graveyard where long ago slabs of earth were subducted, or thrust underneath one another, creating separate regions with different chemical compositions that eventually made their way to the surface in a hot mantle plume, or upwelling, as the core heated the rock into magma.
While geologists had studied a variety of volcanic structures across Australia, the new study -- published in the journal Nature -- is the first to suggest they were all formed by the same mantle plume, a narrow upwelling of magma sourced deep from within the Earth's mantle near the core.
Although the relation between these magmatic provinces and igneous activity in the Baltic Sedimentary Basin area are unclear, the latter might be related alternatively to (i) mantle plume activity or/and (ii) wrenching extension resulting from strike-slip movements along the Tornquist Zone in the west.
REGIONAL GRAVIMETRIC RESPONSE OF THE HAWAIIAN MANTLE PLUME
The results of the spatial distribution and sizes of the seamounts, shapes and arrangements of bases, differences in the topographic tendencies in the Easter Island and Salas y Gomez Island areas, together with geochemical and seafloor ages information, support the argument that the best mechanism to explains the origin of the volcanic chains is that of the existence of a hotspot caused by a mantle plume localized to the W of Salas y Gomez Island, probably at ~107[degrees]W.
There are all these little slivers of continent that may peel off continents when the hotspot of a mantle plume passes under them," Hartz said.
It is suggested that these Late Cretaceous intra-plate volcanics may be related to the mantle plume activity of the Reunion hotspot, and were erupted during the passage of Ceno-Tethys ocean floor prior to the passage of the Indian plate over it.
The lack of a large eruptive volume or a thermal swell argues against a mantle plume origin for the TWVF.
The enriched component in incompatible elements in the mantle source carne specifically from the peripheral area of the mantle plume head.