Deformation of Core and Lower Mantle Materials

Merkel, Sébastien

doi:10.1002/9781118992487.ch7

Cited by 1 publication

(1 citation statement)

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“…In addition, the strain imposed under a conventional DAC is probably not large enough to observe the LPO of specimens from their steady‐state deformation (Tsujino et al., 2016), and even measuring the imposed strain on specimens in a DAC is challenging. Moreover, it is difficult to quantify the pressure effects separately because deformation and pressure are coupled in the DAC experiments (Merkel & Cordier, 2016). Nevertheless, the conventional DAC is the only apparatus that allows experiments to be conducted under pressure conditions relevant to the lower mantle.…”

Section: Introductionmentioning

confidence: 99%

Development of Lattice‐Preferred Orientations of MgO Periclase From Strain Rate Controlled Shear Deformation Experiments Under Pressure up to 120 GPa

Park

Azuma

Okazaki

et al. 2022

Geophysical Research Letters

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The Earth's lower mantle hosts thermal convection involving plastic deformation of minerals, which induces lattice-preferred orientation (LPO) of the mantle minerals and resultant seismic anisotropy (Karato, 1998;McNamara et al., 2002). In particular, the lowermost mantle (D″ layer), where large plastic deformation is likely to be concentrated, exhibits interesting seismic anisotropy; regions surrounding large low shear velocity provinces (LLSVP) show clear shear wave splitting with V SH > V SV for ray paths quasi-parallel to the core-mantle boundary, while seismic anisotropy vanishes or reverses (V SH < V SV ) inside the LLSVP (McNamara, 2019;Romanowicz & Wenk, 2017). The relationship between seismic anisotropy and deformation-induced LPOs of mantle minerals provides key information on the dynamics of lower mantle convection and thermo-chemical evolution of the Earth (e.g., Nowacki et al., 2011).

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Section: Introductionmentioning

confidence: 99%