Negative radial anisotropy near stagnant slabs explained by shear-deformed δ-AlOOH/δ-H. (IMAGE)

Ehime University

Negative radial anisotropy near stagnant slabs explained by shear-deformed δ-AlOOH/δ-H.

Caption

Schematic cross-sections of stagnant slabs with stability fields of selected hydrous phases in cold slabs. One-dimensional radial anisotropy profiles ξ=V2SH/V2 SVnear representative slabs are modified after Ferreira et al. (2019). Blue dots indicate regions where ~15 vol.% δ-AlOOH/δ-H within isotropic mantle rocks is sufficient to explain the seismic anisotropy observed near stagnant slab tops in the lower mantle transition zone (ξ = 0.995). Abbreviations: Wds, wadsleyite; Rwd, ringwoodite; Maj, majorite; Bdm, bridgmanite; Fper, ferro‐periclase; ShyB, superhydrous phase B; PhD, phase D; δ, δ‐AlOOH.

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Wentian Wu

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