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The effect of metastable pyroxene on the slab dynamics

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Title: The effect of metastable pyroxene on the slab dynamics
Authors: Agrusta, R
Van Hunen, J
Goes, S
Item Type: Journal Article
Abstract: Seismic studies show that some subducting slabs penetrate straight into the lower mantle, whereas others seem to flatten near the base of the mantle transition zone. Slab stagnation is often attributed to an increase in viscosity and phase transformations in the olivine system. However, recent mineral physics studies showed that due to extremely low transformational diffusion rates, low-density metastable pyroxene may persist into the transition zone in cool slabs. Here we use a dynamically fully self-consistent subduction model to investigate the influence of metastable pyroxene on the dynamics of subducting oceanic lithosphere. Our results show that metastable pyroxene affects slab buoyancy at least as much as olivine metastability. However, unlike metastable olivine, which can inhibit slab penetration in the lower mantle only for cold, old, and fast slabs, metastable pyroxene is likely to also affect sinking of relatively young and slow slabs.
Issue Date: 10-Dec-2014
Date of Acceptance: 6-Dec-2014
URI: http://hdl.handle.net/10044/1/41420
DOI: http://dx.doi.org/10.1002/2014GL062159
ISSN: 1944-8007
Publisher: American Geophysical Union
Start Page: 8800
End Page: 8808
Journal / Book Title: Geophysical Research Letters
Volume: 41
Issue: 24
Copyright Statement: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: NE/J007854/1
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
subduction
metastable pyroxene
phase transition
MANTLE TRANSITION-ZONE
SUBDUCTED SLABS
OLIVINE METASTABILITY
EXPERIMENTAL CONSTRAINTS
SEISMIC DISCONTINUITY
SPINEL TRANSFORMATION
OVERRIDING PLATE
TRENCH RETREAT
LITHOSPHERE
STAGNATION
Meteorology & Atmospheric Sciences
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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