Seismic anisotropy, dominant slip systems and phase transitions in the lowermost mantle

Chandler, Brian Chase; Chen, Li-Wei; Li, Mingming; Romanowicz, Barbara; Wenk, Hans-Rudolf

doi:10.1093/gji/ggab278

Seismic anisotropy, dominant slip systems and phase transitions in the lowermost mantle

Journal Article · Mon Jul 19 00:00:00 EDT 2021 · Geophysical Journal International

DOI:https://doi.org/10.1093/gji/ggab278· OSTI ID:1817944

Chandler, Brian Chase; Chen, Li-Wei; Li, Mingming; Romanowicz, Barbara;

SUMMARY

The presence of seismic anisotropy at the base of the Earth's mantle is well established, but there is no consensus on the deformation mechanisms in lower mantle minerals that could explain it. Strong anisotropy in magnesium post-perovskite (pPv) has been invoked, but different studies disagree on the dominant slip systems at play. Here, we aim to further constrain this by implementing the most recent results from atomistic models and high-pressure deformation experiments, coupled with a realistic composition and a 3-D geodynamic model, to compare the resulting deformation-induced anisotropy with seismic observations of the lowermost mantle. We account for forward and reverse phase transitions from bridgmanite (Pv) to pPv. We find that pPv with either dominant (001) or (010) slip can both explain the seismically observed anisotropy in colder regions where downwellings turn to horizontal flow, but only a model with dominant (001) slip matches seismic observations at the root of hotter large-scale upwellings. Allowing for partial melt does not change these conclusions, while it significantly increases the strength of anisotropy and reduces shear and compressional velocities at the base of upwellings.

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Research Organization:: University of California, Oakland, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER15637

OSTI ID:: 1817944

Alternate ID(s):: OSTI ID: 1979488

Journal Information:: Geophysical Journal International, Journal Name: Geophysical Journal International Journal Issue: 3 Vol. 227; ISSN 0956-540X

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Seismic anisotropy, dominant slip systems and phase transitions in the lowermost mantle

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