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A mantle plume is a proposed mechanism of convection within the Earth's mantle, hypothesized to explain anomalous volcanism. [2] Because the plume head partially melts on reaching shallow depths, a plume is often invoked as the cause of volcanic hotspots, such as Hawaii or Iceland, and large igneous provinces such as the Deccan and Siberian Traps.
One suggests that hotspots are due to mantle plumes that rise as thermal diapirs from the core–mantle boundary. [2] The alternative plate theory is that the mantle source beneath a hotspot is not anomalously hot, rather the crust above is unusually weak or thin, so that lithospheric extension permits the passive rising of melt from shallow ...
There is an ongoing discussion about whether the hotspot is caused by a deep mantle plume or originates at a much shallower depth. [3] Recently, seismic tomography studies have found seismic wave speed anomalies under Iceland, consistent with a hot conduit 100 km (62 mi) across that extends to the lower mantle.
A mantle plume beneath the Paraná may feed both the Fernando de Noronha, the Martin Vaz and some continental volcanic fields. [28] Seismic tomography suggests that this mantle plume is actually the remnant of the plume associated with the Tristan hotspot. [36] Edge-driven convection may be occurring at the margin of Brazil. This would be ...
The Canary hotspot, also called the Canarian hotspot, is a hotspot and volcanically active region centred on the Canary Islands located off the north-western coast of Africa. Hypotheses for this volcanic activity include a deep mantle plume beginning about 70 million years ago.
The resulting motion forms small clusters of small plumes right above the core-mantle boundary 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 (4000 K) to the much colder mantle (2000 K); the recycled lithosphere ...
The Eifel hotspot is a volcanic hotspot in Western Germany. ... The conventional view is that the province is underlain by a mantle plume. [2] [3] ...
Map of hotspots. Iceland is number 14. The geology of Iceland is unique and of particular interest to geologists. Iceland lies on the divergent boundary between the Eurasian plate and the North American plate. It also lies above a hotspot, the Iceland plume. The plume is believed to have caused the formation of Iceland itself, the island first ...