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Questions tagged [mantle-plumes]

Concerning the dynamics and chemistry of convectively upwelling plumes in the mantle, including questions relating evidence base, definition and controversies.

6
votes
2answers
178 views

How can linear oceanic ridges (like the East Pacific Rise) be explained by single point mantle plumes?

I'm a bit confused about how divergent boundaries between tectonic plates work, or just why plates move. I've read that these ridges that are in the place of divergent boundaries are created when ...
2
votes
1answer
49 views

Effect of reducing conditions on melting point

I've been reading a paper(*) looking at the deep carbon cycle and it mentions a key process that the authors refer to as "redox melting". According to the paper, reducing conditions increase the ...
0
votes
1answer
127 views

Is the Mauna Loa CO$_\mathsf{2}$ record affected by the nearby mantle plume?

How is it possible that Mauna Loa Observatory is the International Reference Observatory for CO2 Global Measurements if it is placed above the most important earth thermal plume that is heating the ...
2
votes
0answers
67 views

What is the structure of the hot spot under Hawaii?

The Hawaiian Islands are formed by volcanic activity over a hotspot in the Earth's mantle. What is the shape of this hotspot in the mantle? Is it like a pyramid or a pillar or an upside-down pyramid?
3
votes
0answers
145 views

Can non-antipodal Chicxulub impact seismic wave be connected to Rio Grande Rift and Laramide Orogeny?

I have conducted a brief survey of Internet sources and cannot locate any definite discussion of a possible connection between the Chicxulub impact and the inception or acceleration of the Rio Grande ...
14
votes
1answer
251 views

Is Iceland an example of a hot-spot overlying a mantle plume?

Iceland has been cited as the location of a hot-spot overlying a mantle plume (similar to that of the Hawaii chain in the Pacific), though for some time this model has been challenged (see Gillian ...
11
votes
1answer
471 views

Are mantle plumes distributed around the core randomly or in a known pattern?

Background: The theory of mantle plumes is useful (although controversial) in explaining the occurrence of intra-plate volcanoes. The website here suggests that "hotspots" exist in fixed locations ...
12
votes
1answer
238 views

How do mantle plumes travel from the core of Earth to the crust?

As mantle plumes begin in the core and move towards the crust, I would have thought that the heat in the mantle plume would disperse to the surrounding mantle, and the plume would cease to exist by ...
21
votes
2answers
363 views

What are some of the strongest theories against the existence of mantle plumes?

Among the people I interact with in the geodynamics community, it seems that almost all of us are in full support of the mantle plume theory. What are the strongest arguments against this theory? Is ...