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   Articles with "core mantle" as a keyword



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Grain boundary diffusion of W in lower mantle phase with implications for isotopic heterogeneity in oceanic island basalts by core-mantle interactions

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recommendations! Published in 2020 at "Earth and Planetary Science Letters"

DOI: 10.1016/j.epsl.2019.115887

Abstract: Tungsten isotopes provide important constraints on the ocean-island basalt (OIB) source regions. Recent analyses of μ182W in modern basalts with high 3He/4He originating from the core-mantle boundary region reveal two distinct features: positive μ182W in… read more here.

Keywords: lower mantle; boundary diffusion; grain boundary; core mantle ... See more keywords
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Core-mantle boundary topography and its relation to the viscosity structure of the lowermost mantle

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recommendations! Published in 2020 at "Earth and Planetary Science Letters"

DOI: 10.1016/j.epsl.2020.116358

Abstract: Abstract Two large areas of anomalously low seismic velocities are visible in all tomographic models of the lowermost mantle. Depending on the density structure of these Large Low Shear Velocity Provinces (LLSVPs), the core-mantle boundary… read more here.

Keywords: topography; viscosity; viscosity structure; lowermost mantle ... See more keywords

Immiscible silicate liquids and phosphoran olivine in Netschaëvo IIE silicate: Analogue for planetesimal core–mantle boundaries

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recommendations! Published in 2017 at "Geochimica et Cosmochimica Acta"

DOI: 10.1016/j.gca.2016.10.042

Abstract: Abstract We have investigated a piece of the Netschaevo IIE iron meteorite containing a silicate inclusion by means of electron microprobe analysis (EMPA) and transmission electron microscopy (TEM). Netschaevo contains chondrule-bearing clasts and impact melt… read more here.

Keywords: silicate; phosphoran olivine; inclusion; core mantle ... See more keywords
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Earth’s volatile accretion as told by Cd, Bi, Sb and Tl core–mantle distribution

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recommendations! Published in 2021 at "Geochimica et Cosmochimica Acta"

DOI: 10.1016/j.gca.2021.02.017

Abstract: Abstract The timing and origin of volatile elements accretion on Earth has been and continues to be key questions, despite intense research scrutiny. Two end-member scenarios are usually proposed in which (1) volatile elements were… read more here.

Keywords: earth; accretion; core mantle; core ... See more keywords

Extensive iron–water exchange at Earth’s core–mantle boundary can explain seismic anomalies

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recommendations! Published in 2024 at "Nature Communications"

DOI: 10.1038/s41467-024-52677-9

Abstract: Seismological observations indicate the presence of chemical heterogeneities at the lowermost mantle, just above the core–mantle boundary (CMB), sparking debate over their origins. A plausible explanation for the enigmatic seismic wave velocities observed in ultra-low-velocity… read more here.

Keywords: iron enrichment; iron; mantle boundary; water ... See more keywords

Regional stratification at the top of Earth's core due to core–mantle boundary heat flux variations

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recommendations! Published in 2019 at "Nature Geoscience"

DOI: 10.1038/s41561-019-0381-z

Abstract: Earth’s magnetic field is generated by turbulent motion in its fluid outer core. Although the bulk of the outer core is vigorously convecting and well mixed, some seismic, geomagnetic and geodynamic evidence suggests that a… read more here.

Keywords: stratification; mantle boundary; core mantle; heat flux ... See more keywords

Long-term core-mantle interaction explains W-He isotope heterogeneities.

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recommendations! Published in 2023 at "Proceedings of the National Academy of Sciences of the United States of America"

DOI: 10.1073/pnas.2215903120

Abstract: The isotopic characteristics of ocean island basalts have long been used to infer the nature of their source and the long-term evolution of the Earth's mantle. Anticorrelation between tungsten and helium isotopic signatures is a… read more here.

Keywords: long term; core; core mantle; isotopic ... See more keywords

Marginal stability analyses for thermochemical convection and its implications for the dynamics of continental lithosphere and core-mantle boundary regions

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recommendations! Published in 2024 at "Geophysical Journal International"

DOI: 10.1093/gji/ggae340

Abstract: Significant compositional differences may exist in the lithospheric mantle and above the core-mantle boundary (CMB) relative to the ambient mantle. The intrinsic density differences may affect the development of thermal boundary layer (TBL) instabilities associated… read more here.

Keywords: stability; marginal stability; core mantle; instability ... See more keywords

Earth's core–mantle boundary shaped by the crystallization of a hydrous terrestrial magma ocean

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recommendations! Published in 2024 at "National Science Review"

DOI: 10.1093/nsr/nwae169

Abstract: Enigmatic anomalous structures of Earth's lowermost mantle may have been incubated at the hydrous magma ocean of the Hadean eon. read more here.

Keywords: mantle boundary; boundary shaped; mantle; core mantle ... See more keywords