Publication details for Prof Jeroen van HunenAgrusta, R., van Hunen, J. & Goes, S. (2014). The effect of metastable pyroxene on the slab dynamics. Geophysical Research Letters 41(24): 8800-8808.
- Publication type: Journal Article
- ISSN/ISBN: 0094-8276 (print), 1944-8007 (online)
- DOI: 10.1002/2014GL062159
- Keywords: Subduction, Metastable pyroxene, Phase transition.
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
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.
Published on behalf of the American Geophysical Union