Results 31 to 40 of about 45,975 (280)
Mantle Hg isotopic heterogeneity and evidence of oceanic Hg recycling into the mantle
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
doaj +1 more source
Strong, Multi-Scale Heterogeneity in Earth’s Lowermost Mantle [PDF]
Scientific Reports, 2015 AbstractThe core mantle boundary (CMB) separates Earth’s liquid iron outer core from the solid but slowly convecting mantle. The detailed structure and dynamics of the mantle within ~300 km of this interface remain enigmatic: it is a complex region, which exhibits thermal, compositional and phase-related heterogeneity, isolated pockets of partial melt ...
Tkalčić, Hrvoje +5 more
openaire +5 more sources
Long‐Lived Source Heterogeneities in the Galapagos Mantle Plume
Geochemistry, Geophysics, Geosystems, 2018 Mantle plume‐derived melts provide a unique glimpse into the chemical heterogeneity of the deep mantle. However, the exact processes involved in forming and sampling lower mantle heterogeneities remain unresolved and thus, require further investigation ...
Esteban Gazel +6 more
doaj +1 more source
The energetics of melting fertile heterogeneities within the depleted mantle [PDF]
To explore the consequences of mantle heterogeneity for primary melt production, we develop a mathematical model of energy conservation for an upwelling, melting body of recycled oceanic crust embedded in the depleted upper mantle.
Katz, R. F., Rudge, John F.
core +1 more source
Geodesy and Geodynamics, 2016 In this paper, we report the assessment of the effect of the three-dimensional (3D) density heterogeneity in the mantle on Earth orientation parameters (EOP) (i.e., the polar motion, or PM, and the length of day, or LOD) in the tidal frequencies.
Lanbo Liu +3 more
doaj +1 more source
Waveform modeling of the slab beneath Japan [PDF]
, 2007 The tomographic P wave model for the Japan subduction zone derived by Zhao et al. (1994) has two very striking features: a slab about 90 km thick with P wave velocities 3–6% higher than the surrounding mantle and a mantle wedge with −6% low-velocity ...
Chen, Min +3 more
core +1 more source
Ab initio study of the elastic behavior of MgSiO3 ilmenite at high pressure [PDF]
, 2002 We investigate the athermal high pressure behavior of the elastic properties of MgSiO3 ilmenite up to 30 GPa using the ab initio pseudopotential method. Our results at zero pressure are in good agreement with single-crystal elasticity measurements.
Da Silva, CRS +3 more
core +1 more source
Is the Deep Martian Mantle Heterogeneous? A Reappraisal of Seismological Evidences
Geophysical Research LettersIt has been proposed that the deep Martian mantle contains distributed heterogeneities preserved since the accretion of the planet. This result relies on a multiple‐scattering interpretation of frequency‐dependent arrival times of P‐waves detected in the
L. Margerin
doaj +2 more sources
Cu‐Isotope Evidence for Subduction Modification of Lithospheric Mantle
Geochemistry, Geophysics, Geosystems, 2022 Ultramafic xenoliths from southeastern Arizona, USA, provide evidence for Cu‐isotope heterogeneity in the lithospheric mantle. We report new data on Type I (Cr‐, Mg‐rich) peridotites, but also the first Cu‐isotope data for Fe‐Ti‐Al‐rich Type II ...
Pamela D. Kempton +5 more
doaj +1 more source
The Hudson Bay Lithospheric Experiment (HuBLE) : Insights into Precambrian Plate Tectonics and the Development of Mantle Keels [PDF]
, 2015 The UK component of HuBLE was supported by Natural Environment Research Council (NERC) grant NE/F007337/1, with financial and logistical support from the Geological Survey of Canada, Canada–Nunavut Geoscience Office, SEIS-UK (the seismic node of NERC ...
Bastow, I. D. +8 more
core +2 more sources