Results 1 to 10 of about 45,613 (188)
Ancient storage of anomalous mercury isotope signatures in the Earth’s transition zone [PDF]
Nature CommunicationsCharacterizing the mantle transition zone (MTZ) is essential for understanding Earth’s evolution and dynamics. Petrological, geochemical, and geophysical evidence suggests that the MTZ may host subducted slabs containing sediments and volatiles ...
Rong Xu +14 more
doaj +2 more sources
Coupled dynamics and evolution of primordial and recycled heterogeneity in Earth's lower mantle [PDF]
Solid Earth, 2021 The nature of compositional heterogeneity in Earth's lower mantle remains a long-standing puzzle that can inform about the long-term thermochemical evolution and dynamics of our planet.
A. J. P. Gülcher +4 more
doaj +1 more source
The relative contributions of scattering and viscoelasticity to the attenuation of S waves in Earth's mantle [PDF]
Solid Earth, 2020 The relative contributions of scattering and viscoelastic attenuation to the apparent attenuation of seismic body waves are estimated from synthetic and observed S waves multiply reflected from Earth's surface and the core–mantle boundary.
S. deSilva, V. F. Cormier
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2021 The Earth's upper mantle is isotopically heterogeneous over large lengthscales, but the lower limit of these heterogeneities is not well quantified. Grain scale trace elemental variability has been observed in mantle peridotites, which suggests that ...
Benjamin L. Byerly +2 more
doaj +1 more source
Extreme isotopic heterogeneity in Samoan clinopyroxenes constrains sediment recycling
Nature Communications, 2021 Subduction of oceanic crust and sediments contributes to heterogeneities in the mantle, which are sampled by mantle plumes. Here, the authors find that extreme isotopic heterogeneity in Samoan clinopyroxenes can help constrain the composition of mantle ...
Jenna V. Adams +6 more
doaj +1 more source
Do Olivine Crystallization Temperatures Faithfully Record Mantle Temperature Variability?
Geochemistry, Geophysics, Geosystems, 2021 Crystallization temperatures of primitive olivine crystals have been widely used as both a proxy for, or an intermediate step in calculating, mantle temperatures. The olivine‐spinel aluminum‐exchange thermometer has been applied to samples from mid‐ocean
Simon Matthews +4 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2021 Lavas that have erupted at near‐axis seamounts provide windows into mid‐ocean ridge mantle heterogeneity and melting systematics which are not easily observed on‐axis at fast‐spreading centers.
Molly Anderson +6 more
doaj +1 more source
Machine Learning Reveals Source Compositions of Intraplate Basaltic Rocks
Geochemistry, Geophysics, Geosystems, 2021 Recycling of crustal material is thought to introduce pyroxenite to the peridotite mantle. Mapping such lithological heterogeneity within the mantle is crucial to understanding the mantle's chemical evolution but remains challenging.
Peng Guo +3 more
doaj +1 more source
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
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