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Strong Effect of Stress on the Seismic Signature of the Post-Stishovite Phase Transition in the Earth's Lower Mantle

Title data

Wang, Biao ; Buchen, Johannes ; Méndez, Alba San José ; Kurnosov, Alexander ; Criniti, Giacomo ; Liermann, Hanns-Peter ; Marquardt, Hauke:
Strong Effect of Stress on the Seismic Signature of the Post-Stishovite Phase Transition in the Earth's Lower Mantle.
In: Geophysical Research Letters. Vol. 50 (2023) Issue 10 . - e2023GL102740.
ISSN 1944-8007
DOI: https://doi.org/10.1029/2023GL102740

Official URL: Volltext

Abstract in another language

Abstract The stishovite to post-stishovite phase transition may modify the scattering of seismic waves by stishovite-bearing rocks in the Earth's lower mantle. A series of continuous compression experiments on sintered polycrystalline stishovite was performed to study the effect of stress on the phase transition. The experimental results show that the phase transition shifts to lower pressures as the magnitude of deviatoric stress increases. Our results further show that the bulk modulus of sintered polycrystalline stishovite differs from that derived from single crystal measurements and decreases at the phase transition. In cold regions, such as subducted slabs, stresses may accumulate and shift the phase transition to a shallower depth. In hot regions with less stress, such as rising plumes, the phase transition is shifted to a greater depth. In addition, the phase transition may have varying seismic signatures depending on the behavior of the grain boundaries in mantle rocks and the micro-stresses present in neighboring grains.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: e2023GL102740 2023GL102740
Keywords: Earth's lower mantle; stishovite to post-stishovite phase transition; stress; bulk modulus; high pressure experiments; seismic scatterers
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 18 Oct 2024 07:20
Last Modified: 18 Oct 2024 07:20
URI: https://eref.uni-bayreuth.de/id/eprint/90742