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Inference on Water Content in the Mantle Transition Zone Near Subducted Slabs From Anisotropy Tomography

Chang, S-J; Ferreira, AMG; (2019) Inference on Water Content in the Mantle Transition Zone Near Subducted Slabs From Anisotropy Tomography. Geochemistry, Geophysics, Geosystems , 20 (2) pp. 1189-1201. 10.1029/2018GC008090. Green open access

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Abstract

We examine the patterns of radial anisotropy in global tomography images of the mantle transition zone near subducted slabs in the western Pacific. Fast SV velocity anomalies are observed in this region, which are compatible with anisotropy due to lattice‐preferred orientation in wadsleyite. Using mineral physics reports of the dependency of the strength of radial anisotropy on water content in wadsleyite, we estimate the water content in the transition zone near subducted slabs from the tomography images. We find that fast SV anisotropy anomalies over ~1.5% observed beneath subduction zones in the western Pacific are compatible with a low water content (smaller than ~3,000 ppm H/SI), notably beneath the Tonga‐Kermadec trenches, the Philippines, and the Sumatra trench.

Type: Article
Title: Inference on Water Content in the Mantle Transition Zone Near Subducted Slabs From Anisotropy Tomography
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2018GC008090
Publisher version: https://doi.org/10.1029/2018GC008090
Language: English
Additional information: © 2019. The Authors. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/).
Keywords: radial anisotropy, seismic tomography, lattice‐preferred orientation, mantle transition zone, water content
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10066551
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