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Thermally-driven mantle plumes reconcile multiple hot-spot observations

Davies, David Rhodri ORCID: and Davies, John Huw ORCID: 2009. Thermally-driven mantle plumes reconcile multiple hot-spot observations. Earth and Planetary Science Letters 278 (1-2) , pp. 50-54. 10.1016/j.epsl.2008.11.027

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Hot-spots are anomalous regions of magmatism that cannot be directly associated with plate tectonic processes. They are widely-regarded as the surface expression of upwelling mantle plumes. Hot-spots exhibit variable life-spans, magmatic productivity and fixity. This suggests that a wide-range of upwelling structures coexist within Earth's mantle, a view supported by geochemical and seismic evidence, but, thus far, not fully-reproduced by numerical models. Here, results from a new, global, 3-D spherical, mantle convection model are presented, which better reconcile hot-spot observations, the key modification from previous models being increased convective vigor. Model upwellings show broad-ranging dynamics; some drift slowly, while others are more mobile, displaying variable life-spans, intensities and migration velocities. Such behavior is consistent with hot-spot observations, indicating that the mantle must be simulated at the correct vigor and in the appropriate geometry to reproduce Earth-like dynamics. Thermally-driven mantle plumes can explain the principal features of hot-spot volcanism on Earth.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Earth and Environmental Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: Hot-spots; Mantle plumes; Plate tectonics; Paleomagnetism; Multigrid-refinement; Multi-resolution
Publisher: Elsevier
ISSN: 0012-821X
Last Modified: 07 May 2023 21:41

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