Deformation-Induced Mechanical Instabilities at the Core-Mantle Boundary [PDF]
, 2007 Post-Perovskite: The Last Mantle Phase Transition Our understanding of the core-mantle boundary (CMB) region has improved significantly over the past several years due, in part, to the discovery of the post-perovskite phase.
Petford, Nick +2 more
core +10 more sources
Patched removal of the mantle lithosphere under orogens: A systematic numerical study
Frontiers in Earth Science, 2023 Delamination or convective thinning could cause large-scale and complete removal of the mantle lithosphere under orogens. However, geological and geophysical observations suggest that patched removal of the mantle lithosphere has occurred in some orogens,
Tian Lei +6 more
doaj +1 more source
A subduction influence on ocean ridge basalts outside the Pacific subduction shield
Nature Communications, 2021 We discover a pervasive subduction influence in the Arctic, Atlantic and Indian mantle, which is nearly absent in the Pacific mantle. Such a hemispheric-scale upper mantle heterogeneity reflects the control of a “subduction shield” that has surrounded ...
A. Y. Yang +5 more
doaj +1 more source
Geochemical Constraints on the Structure of the Earth's Deep Mantle and the Origin of the LLSVPs
Geochemistry, Geophysics, Geosystems, 2021 Geophysical analysis of the Earth's lower mantle has revealed the presence of two superstructures characterized by low shear wave velocities on the core‐mantle boundary.
Matthew Gleeson +4 more
doaj +1 more source
Viscoelastic Mantle Density Heterogeneity and Core-Mantle Topograph [PDF]
Geophysical Journal International, 1996 SUMMARY Starting with the model of mantle density heterogeneity derived by Ricard et al. (1993), which uses plate-motion reconstructions under the assumption that subducted slabs sink vertically into the mantle, we model the temporal evolution of these internal loads.
Marianne Greff-Lefftz, Hilaire Legros
openaire +1 more source
Low‐Degree Melt Metasomatic Origin of Global Upper Mantle Fe Isotope Fractionation
Geophysical Research Letters, 2023 The upper mantle is heterogeneous in Fe isotope compositions, but the origin of the heterogeneity needs understanding. Recent studies on oceanic basalts demonstrate that the upper mantle Fe isotope heterogeneity results from low‐degree melt metasomatism.
Pengyuan Guo +7 more
doaj +1 more source
Annals of Geophysics, 2015 We conduct joint tomographic inversions of P and S travel time observations to obtain models of delta v_P and delta v_S in the entire mantle. We adopt a recently published method which takes into account the geodynamic coupling between mantle ...
Gaia Soldati +3 more
doaj +1 more source
Multiscale modeling of upper mantle plasticity: From single-crystal rheology to multiphase aggregate deformation [PDF]
, 2014 We report a first application of an improved second-order (SO) viscoplastic self-consistent model for multiphase aggregates, applied to an olivine + diopside aggregate as analogue for a dry upper mantle peridotite deformed at 10 15 s 1 shear strain rate ...
CORDIER, Patrick +6 more
core +1 more source
Geomagnetic Impulses and the Electrical Conductivity of the Lower Mantle [PDF]
, 1991 This thesis is an investigation of the changes in the magnetic field as measured at the surface of the Earth on the time-scale of months to decades. In particular the phenomena of geomagnetic "impulses" or "jerks" are investigated.
Stewart, Douglas Norman
core +7 more sources
Does depleted mantle form an intrinsic part of the Iceland plume? [PDF]
, 2003 Icelandic basalt ranges in composition from voluminous tholeiite, erupted in the rift zones, to small-volume, mildly alkaline basalt erupted off-axis.
Fitton, J. G. +3 more
core +1 more source