Complex depth distribution of mid-lower mantle seismic scatterers in the circum-Pacific region and the post-stishovite transition depths affected by the various Al and H content. (IMAGE)

Ehime University

Complex depth distribution of mid-lower mantle seismic scatterers in the circum-Pacific region and the post-stishovite transition depths affected by the various Al and H content.

Caption

(a)The phase boundary between stishovite and post-stishovite with the varying Al content. The contour represents the phase boundary of stishovite with different Al content and the H/Al ratio of ~1/3. Geotherm: from Katsura (2022). (b) The depth distribution histogram of the lower-mantle seismic scatterers in the circum-Pacific region (He & Zheng, 2018; Kaneshima, 2019; Li & Yuen, 2014; Niu, 2014; Niu et al., 2003; Vanacore et al., 2006; Yang & He, 2015; Yuan et al., 2021). (c) Map of the mid-lower mantle scatterers around the circum-Pacific region. The color of these spots represents the Al content in SiO2 required to account for the observed depth of these seismic scatterers. The Al content in SiO2 was estimated under the conditions of the H/Al ratio of ~1/3 and the normal mantle geotherm. The color bars in figures a and c are the same.

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Ehime University

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