Results 11 to 20 of about 9,129 (164)
Mantle Hg isotopic heterogeneity and evidence of oceanic Hg recycling into the mantle [PDF]
Nature Communications, 2022 This work demonstrates distinct mass-independent mercury isotope fractionation in global basalts, which suggests mantle Hg isotope heterogeneity and reveals large-scale translithospheric Hg recycling via plate tectonics.
Runsheng Yin +12 more
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Dynamic Earth: crustal and mantle heterogeneity
Australian Journal of Earth Sciences, 2008 The dynamic processes within the Earth leave their record in geophysical and geochemical variation about the general stratification with depth. A snapshot of current structure is provided by geophysical evidence, whereas geochemical information provides a perspective over the age of the Earth.
B L N Kennett, Hrvoje Tkalčić
exaly +3 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
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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
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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
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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
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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
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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
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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
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