Please use this identifier to cite or link to this item: http://hdl.handle.net/10125/41149

Double layering of a thermochemical plume in the upper mantle beneath Hawaii

Item Summary

Title: Double layering of a thermochemical plume in the upper mantle beneath Hawaii
Authors: Ballmer, Maxim D.
Ito, Garrett
Wolfe, Cecily J.
Solomon, Sean C.
Keywords: intraplate volcanism
thermochemical mantle plume
seismic resolution test
Hawaii
hotspot
Issue Date: Jun 2013
Publisher: Elsevier
Related To: http://www.sciencedirect.com/science/article/pii/S0012821X13003385
Abstract: According to classical plume theory, purely thermal upwellings rise through the mantle, pond in a thin layer beneath the lithosphere, and generate hotspot volcanism. Neglected by this theory, however, are the dynamical effects of compositional heterogeneity carried by mantle plumes even though this heterogeneity has been commonly identified in sources of hotspot magmas. Numerical models predict that a hot, compositionally heterogeneous mantle plume containing a denser eclogite component tends to pool at ∼300–410 km depth before rising to feed a shallower sublithospheric layer. This double-layered structure of a thermochemical plume is more consistent with seismic tomographic images at Hawaii than the classical plume model. The thermochemical structure as well as time dependence of plume material rising from the deeper into the shallower layer can further account for long-term fluctuations in volcanic activity and asymmetry in bathymetry, seismic structure, and magma chemistry across the hotspot track, as are observed.
Pages/Duration: 10 pages
URI/DOI: http://hdl.handle.net/10125/41149
DOI: 10.1016/j.epsl.2013.06.022
Rights: © 2013 Elsevier B.V. All rights reserved.
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