Thermal impact of magmatism in subduction zones

Jones, David W. Rees and Katz, Richard F. and Tian, Meng and Rudge, John F. (2017) Thermal impact of magmatism in subduction zones. Earth and Planetary Science Letters, 481. pp. 73-79. ISSN 0012821X DOI 10.1016/j.epsl.2017.10.015

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Abstract

Magmatism in subduction zones builds continental crust and causes most of Earth's subaerial volcanism. The production rate and composition of magmas are controlled by the thermal structure of subduction zones. A range of geochemical and heat flow evidence has recently converged to indicate that subduction zones are hotter than predicted by models of solid-state mantle creep. We show that this discrepancy can be resolved by consideration of the heat transported by magma itself. In our one- and two-dimensional numerical models and scaling analysis, magmatic transport of sensible and latent heat locally alters the thermal structure of canonical models by $\textbackslashsim$300 K, increasing predicted surface heat flow and mid-lithospheric temperatures to observed values. We find the advection of sensible heat to be significantly larger than the deposition of latent heat. Based on these results we conclude that thermal transport by magma migration affects the chemistry and the location of arc volcanoes.

Item Type:	Article
Additional Information:	this was previosuly published in arXiv at http://arxiv.org/abs/1701.02550
Uncontrolled Keywords:	2017AREP; IA72;
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics 08 - Green Open Access
Journal or Publication Title:	Earth and Planetary Science Letters
Volume:	481
Page Range:	pp. 73-79
Identification Number:	10.1016/j.epsl.2017.10.015
Depositing User:	Sarah Humbert
Date Deposited:	20 Feb 2017 17:20
Last Modified:	01 Mar 2018 13:33
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3812

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