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SUMMARY:New approaches to coupling the thermodynamics and geodynamics of m
 antle melting - Lucy Tweed (University of Cambridge)
DTSTART:20221117T113000Z
DTEND:20221117T123000Z
UID:TALK192410@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Partial melting of the mantle beneath mid-ocean ridges\, subdu
 ction zone arcs\, and hotspot volcanoes produces new igneous crust and is 
 the primary mechanism of chemical differentiation on Earth. Magmas are ext
 racted to the surface through viscous compaction of the mantle residue\, a
 nd via brittle fractures in the cold tectonic plates. Holistic modelling o
 f magma transport in Earth’s interior requires consistent coupling of th
 e thermodynamics of melting and melt-rock reaction\, and the fluid dynamic
 s of melt extraction from a deformable medium. However\, the high dimensio
 nality of such coupled problems presents a major theoretical and computati
 onal challenge. In this talk I will present a new thermodynamically consis
 tent and tractable framework for integrating multicomponent thermodynamics
  and multiphase geodynamics. Globally oceanic crust is observed to have a 
 basaltic composition\, presenting a conundrum as it is not in chemical equ
 ilibrium with the uppermost mantle. I will apply the framework to explore 
 how emergent reactive channelisation beneath midocean ridges permit this g
 eochemical disequilibrium to be sustained. 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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