Geographic variations in lowermost mantle structure from the ray parameters and decay constants of core‐diffracted waves
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Geophysical Research"
DOI: 10.1002/2017jb013930
Abstract: We introduce an array-based approach for constraining seismic velocity structure in the lowermost mantle by measuring the frequency dependence of the ray parameter p and decay constant γ for core-diffracted waves (Pdiff & SHdiff). The… read more here.
Keywords: decay constants; diffracted waves; lowermost mantle; core diffracted ... See more keywords
Phase transition and thermal equations of state of (Fe,Al)-bridgmanite and post-perovskite: Implication for the chemical heterogeneity at the lowermost mantle
Sign Up to like & getrecommendations! Published in 2018 at "Earth and Planetary Science Letters"
DOI: 10.1016/j.epsl.2018.03.004
Abstract: Abstract In this study, we have determined the phase boundary between Mg0.735Fe0.21Al0.07Si0.965O3-Bm and PPv and the thermal equations of state of both phases up to 202 GPa and 2600 K using synchrotron X-ray diffraction in… read more here.
Keywords: phase; transition; equations state; lowermost mantle ... See more keywords
Core-mantle boundary topography and its relation to the viscosity structure of the lowermost mantle
Sign Up to like & getrecommendations! Published in 2020 at "Earth and Planetary Science Letters"
DOI: 10.1016/j.epsl.2020.116358
Abstract: Abstract Two large areas of anomalously low seismic velocities are visible in all tomographic models of the lowermost mantle. Depending on the density structure of these Large Low Shear Velocity Provinces (LLSVPs), the core-mantle boundary… read more here.
Keywords: topography; viscosity; viscosity structure; lowermost mantle ... See more keywords
Linking lowermost mantle structure, core-mantle boundary heat flux and mantle plume formation
Sign Up to like & getrecommendations! Published in 2018 at "Physics of the Earth and Planetary Interiors"
DOI: 10.1016/j.pepi.2018.01.010
Abstract: Abstract The dynamics of Earth’s lowermost mantle exert significant control on the formation of mantle plumes and the core-mantle boundary (CMB) heat flux. However, it is not clear if and how the variation of CMB… read more here.
Keywords: cmb heat; plume; lowermost mantle; heat ... See more keywords
Seismic anisotropy, dominant slip systems and phase transitions in the lowermost mantle
Sign Up to like & getrecommendations! Published in 2021 at "Geophysical Journal International"
DOI: 10.1093/gji/ggab278
Abstract: 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… read more here.
Keywords: slip; dominant slip; anisotropy; seismic anisotropy ... See more keywords
Sensitivity of SK(K)S and ScS phases to heterogeneous anisotropy in the lowermost mantle from global wavefield simulations
Sign Up to like & getrecommendations! Published in 2021 at "Geophysical Journal International"
DOI: 10.1093/gji/ggab347
Abstract: Observations of seismic anisotropy at the base of the mantle are abundant. Given recent progress in understanding how deformation relates to anisotropy in lowermost mantle minerals at the relevant pressure and temperature conditions, these observations… read more here.
Keywords: base mantle; scs phases; lowermost mantle; anisotropy lowermost ... See more keywords
Mapping global kimberlite potential from reconstructions of mantle flow over the past billion years
Sign Up to like & getrecommendations! Published in 2022 at "PLoS ONE"
DOI: 10.1371/journal.pone.0268066
Abstract: Kimberlites are the primary source of economic grade diamonds. Their geologically rapid eruptions preferentially occur near or through thick and ancient continental lithosphere. Studies combining tomographic models with tectonic reconstructions and kimberlite emplacement ages and… read more here.
Keywords: lowermost mantle; mantle structures; flow past; global kimberlite ... See more keywords