Results 21 to 30 of about 9,129 (164)
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
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
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
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
Scientific Reports, 2021 Two-thirds of the Earth is covered by mid-ocean ridge basalts, which form along a network of divergent plate margins. Basalts along these margins display a chemical diversity, which is consequent to a complex interplay of partial mantle melting in the ...
Marianne Richter +4 more
doaj +1 more source
Nature Communications, 2018 The Earth’s mantle undergoes changes as temperature and pressure increase with depth. Here, the authors present a global interrogation of reflectors in the Earth’s mid-mantle revealing a significant variation in their properties, with widespread ...
Lauren Waszek +2 more
doaj +1 more source
pyMelt: An extensible Python engine for mantle melting calculations
Volcanica, 2022 Modelling the melting of Earth’s mantle is crucial for understanding the distribution of volcanic activity on Earth and for testing models of mantle convection and mantle lithological heterogeneity.
Simon Matthews +2 more
doaj +1 more source
Dense hydrous silica carrying water to the deep Earth and promotion of oxygen fugacity heterogeneity
Matter and Radiation at Extremes, 2022 Water has remarkable effects on the properties of mantle rocks, but, owing to the high temperatures in the mantle, uncertainties remain about how and how much water is transported into the deep Earth.
Yanhao Lin, Ho-Kwang Mao
doaj +1 more source