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
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
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Cenozoic plate driving forces [PDF]
, 1995 Past studies of plate driving forces have concluded that the forces due to subducted slabs in the upper mantle and those due to the thickening of the oceanic lithosphere are the principal driving forces. We reexamine the balance of driving forces for the
Lithgow‐Bertelloni, C, Richards, MA
core +1 more source
Melting and Mixing States of the Earth's Mantle after the Moon-Forming Impact [PDF]
, 2015 The Earth's Moon is thought to have formed by an impact between the Earth and an impactor around 4.5 billion years ago. This impact could have been so energetic that it could have mixed and homogenized the Earth's mantle. However, this view appears to be
Nakajima, Miki, Stevenson, David J.
core +4 more sources
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
Primordial Earth mantle heterogeneity caused by the Moon-forming giant impact [PDF]
, 2019 The giant impact hypothesis for Moon formation successfully explains the dynamic properties of the Earth-Moon system but remains challenged by the similarity of isotopic fingerprints of the terrestrial and lunar mantles.
Ballmer, Maxim D. +6 more
core +3 more sources
The lithospheric mantle and lower crust-mantle relationships under Scotland: a xenolithic perspective [PDF]
, 2011 In the British Isles the majority of volcanic rocks containing upper mantle and lower crustal xenoliths occur in Scotland. Most of the occurrences are of Carboniferous–Permian age.
Arai +17 more
core +1 more source
Stability of (Mg,Fe)SiO3 perovskite and the structure of the lowermost mantle [PDF]
, 2008 Thermodynamic analysis shows that (Mg,Fe)SiO3 perovskite is stable throughout the likely pressure, temperature and compositional regime of the Earth's mantle.
Bukowinski, MST, Stixrude, L
core +1 more source
Fine-scale structure of the mid-mantle characterised by global stacks of PP precursors [PDF]
, 2017 Subduction zones are likely a major source of compositional heterogeneities in the mantle, which may preserve a record of the subduction history and mantle convection processes.
Albarède +50 more
core +1 more source