Results 81 to 90 of about 27,251 (208)

Thick Underplating and Buoyancy of the Bermuda Swell

Geophysical Research Letters
Bermuda is an intraplate ocean swell that does not conform to traditional mantle plume theory. Unlike other prominent bathymetric swells, such as Hawaii, it lacks age‐progressive volcanism, a deeply rooted mantle plume, and modern volcanism.
William D. Frazer, Jeffrey Park
doaj   +1 more source

Secondary Plumes Formation Controlled by Interaction of Thermochemical Mantle Plumes With the Mantle Transition Zone

Geophysical Research Letters
The causes and global distribution of intraplate volcanism remain poorly understood, particularly the occurrence of scattered magmatism unrelated to large igneous provinces (LIPs).
X. Zhu, A. Balázs, T. Gerya, Z. Sun
doaj   +1 more source

The evolution of the Galápagos mantle plume. [PDF]

Sci Adv, 2023
Soderman CR, Shorttle O, Gazel E, Geist DJ, Matthews S, Williams HM.   +5 more
europepmc   +1 more source

On gravity from SST, geoid from Seasat, and plate age and fracture zones in the Pacific [PDF]

A composite map produced by combining 90 passes of SST data show good agreement with conventional GEM models. The SEASAT altimeter data were deduced and found to agree with both the SST and GEM fields. The maps are dominated (especially in the east) by a
Marsh, B. D., Marsh, J. G., Williamson, R. G.   +2 more
core   +2 more sources

Mantle plumes are oxidised

Earth and Planetary Science Letters, 2019
Abstract From oxic atmosphere to metallic core, the Earth's components are broadly stratified with respect to oxygen fugacity. A simple picture of reducing oxygen fugacity with depth may be disrupted by the accumulation of oxidised crustal material in the deep lower mantle, entrained there as a result of subduction. While hotspot volcanoes are fed by
Moussallam, Yves, Longpré, Marc-Antoine, Mccammon, Catherine, Gómez-Ulla, Alejandra, Rose-Koga, Estelle, Scaillet, Bruno, Peters, Nial, Gennaro, Emanuela, Paris, Raphael, Oppenheimer, Clive   +9 more
openaire   +5 more sources

Deep mantle plumes and an increasing Earth radius

Geodesy and Geodynamics, 2019
Recent space geodetic and gravimetric studies have given indications that the Earth's radius is increasing at 0.1–0.4 mm yr−1 at present. Seismic studies have also shown that earthquakes alone could be causing the radius to increase at 0.011–0.06 mm yr−1.
Matthew R. Edwards
doaj   +1 more source

Depleted mantle plumes [PDF]

Goldschmidt2021 abstracts, 2021
Tim Jones, James Day
openaire   +1 more source

Temporal Variations of the Oldest Emperor‐Hawaiian Plume Signature Influenced by Interaction With Shallow Mantle Features

Geochemistry, Geophysics, Geosystems
Hawaiian volcanoes 81 Ma (Meiji and Detroit Seamounts) to ∼50 Ma (Kōko Seamount). We show that Emperor seamounts differ from younger Hawaiian Islands in the abundance of isotopically depleted components.
P. D. Kempton, C. Adam, A. D. Saunders, T. L. Barry   +3 more
doaj   +1 more source

Coldspots or hotspots? The origin of plateau-shaped highlands on Venus [PDF]

A compelling question for the terrestrial planets is the origin of the highland regions on Venus. Data on the topography, gravity signature, and surface morphology returned by the Pioneer Venus, Venera 15/16, and Magellan spacecraft represent a basis for
Bindschadler, D. L.
core   +1 more source

Modeling Anisotropic Signature of Slab‐Induced Mantle Plumes From Thermochemical Piles in the Lowermost Mantle

Geophysical Research Letters
Seismic anisotropy, observed in the lowermost mantle near Large Low‐Shear‐Velocity Provinces (LLSVPs), is likely caused by strong deformation from mantle flow interacting with these regions and/or plume formation.
Poulami Roy, Bernhard Steinberger, Manuele Faccenda, Michaël Pons   +3 more
doaj   +1 more source