Results 121 to 130 of about 9,129 (164)

Mg isotope heterogeneity in the mantle

, 2016
Pogge von Strandmann, P, Elliott, T, Marschall, H, Ionov, D, Niu, Y   +4 more
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Heterogeneity of the Lowermost Mantle

Annual Review of Earth and Planetary Sciences, 2000
Strong heterogeneity at a variety of scale lengths has been imaged in the lowermost mantle using different forward and inverse methods. Coherent patterns in differential travel times of waves that sample the base of the mantle—such as diffracted shear waves (Sdiff) and compressional waves (Pdiff)—are readily apparent, and are compared with results from
Edward J Garnero
exaly   +2 more sources

Geophysics of Chemical Heterogeneity in the Mantle

Annual Review of Earth and Planetary Sciences, 2012
Chemical heterogeneity, produced by the near-surface rock cycle and dominated volumetrically by subducted oceanic crust and its depleted residue, is continuously subducted into the mantle. This lithologic-scale chemical heterogeneity may survive in the mantle for as long as the age of Earth because chemical diffusion is inefficient.
Lars Stixrude, Carolina Lithgow-Bertelloni   +1 more
exaly   +2 more sources

The heterogeneous mantle

Tectonophysics, 2006
Rocks are composed of heterogeneous mixtures of minerals and assemblages of larger units, and there is no reason to assume that the Earth at large and intermediate scale should be homogeneous. However, the resolution of geophysical studies of the Earth’s mantle is limited.
Thybo, H., Anderson, D. L.
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Lateral Heterogeneity in the Earth's Mantle

Nature, 1972
The characteristics of seismic waves detected at the Large Aperture Seismic Array in Montana suggest that, beneath the Bonin Island Arc in particular, there are lateral inhomogeneities in the mantle.
D, Davies, R M, Sheppard
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On the scale of mantle heterogeneity

Physics of the Earth and Planetary Interiors, 1992
Abstract A data set comprising 3313 residuals measured from digital records of 429 earthquakes is analyzed for the heterogeneity of the Earth's mantle. The smoothed SS residuals reveal a large pattern of heterogeneity and agree well with the major tectonic features on the Earth's surface and the residual patterns predicted by upper mantle and whole ...
Wei-jia Su, Adam M. Dziewonski
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Heterogeneous lithospheric mantle

2021
<p>The lithosphere is a thermal boundary layer atop mantle convection and a chemical boundary layer formed by mantle differentiation and melt extraction. The two boundary layers may everywhere have different thicknesses. Worldwide, the thicknesses of thermal and chemical boundary layers vary significantly, reflecting thermal and ...
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Mantle flow models with core‐mantle boundary constraints and chemical heterogeneities in the lowermost mantle

Journal of Geophysical Research: Solid Earth, 2008
Decorrelation between s‐wave and bulk sound velocities in the lowermost mantle and explicit density models based on seismic tomography give evidence for non‐thermal lateral density variations in the lowermost mantle. Here we implement such variations in a numerical model of mantle flow driven by density anomalies which are derived from seismic ...
Steinberger, B., Holme, R.
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Short-Lived Chemical Heterogeneities in the Archean Mantle with Implications for Mantle Convection

Science, 1994
The neodymium isotope and samarium-neodymium systematics of 2.7-billion-year-old mantle-derived magmas indicate that the lifetime of chemical heterogeneities was much shorter in the Archean mantle than in the modern mantle. Isotopic evidence is compatible with a Rayleigh number 100 times larger and convection 10 times faster in the Late Archean ...
J, Blichert-Toft, F, Albarede
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