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Grain-size dynamics beneath mid-ocean ridges : implications for permeability and melt extraction

Abstract:

Grain size is an important control on mantle viscosity and permeability, but is difficult or impossible to measure in situ. We construct a two-dimensional, single phase model for the steady state mean grain size beneath a mid-ocean ridge. The mantle rheology is modeled as a composite of diffusion creep, dislocation creep, dislocation accommodated grain boundary sliding, and a plastic stress limiter. The mean grain size is calculated by the paleowattmeter relationship of Austin and Evans (200...

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Publication status:
Published
Peer review status:
Peer reviewed

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Department:
Earth Sciences
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Author
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Department:
Earth Sciences
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Author
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Grant:
279925
Funding agency for:
Project
Publisher:
American Geophysical Union Publisher's website
Journal:
Geochemistry, Geophysics, Geosystems
Volume:
16
Issue:
3
Pages:
925-946
Publication date:
2015-03-26
Acceptance date:
2015-03-03
DOI:
EISSN:
1525-2027

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