Results 21 to 30 of about 11,816 (290)
P-velocity of the upper mantle
Геофизический журнал, 2021 The authors have constructed models featuring seismic P-wave velocity distribution in the upper mantle beneath oceanic, continental and transition regions, such as mid-ocean ridges, basins, trenches, island arcs, and back-arc troughs, Atlantic ...
V.V. Gordienko, L.Ya. Gordienko
doaj +1 more source
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
Volcanic evolution of an ultraslow-spreading ridge
Nature Communications, 2023 Nearly 30% of ocean crust forms at mid-ocean ridges where the spreading rate is less than 20 mm per year. According to the seafloor spreading paradigm, oceanic crust forms along a narrow axial zone and is transported away from the rift valley.
H. H. Stubseid +4 more
doaj +1 more source
Global Hydrogen Production During High‐Pressure Serpentinization of Subducting Slabs
Geochemistry, Geophysics, Geosystems, 2023 Serpentinization is among the most important, and ubiquitous, geological processes in crustal–upper mantle conditions (
A. S. Merdith +6 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2023 Accreted basaltic rocks are expected to provide information on intraplate volcanism in the oceans. Basaltic rocks, originating from mid‐ocean ridges, plateaus, and seamounts, have been reported from exhumed accretionary complexes. However, basaltic rocks
Ginta Motohashi +3 more
doaj +1 more source
Persistent Magma‐Rich Waves Beneath Mid‐Ocean Ridges Explain Long Periodicity on Ocean Floor Fabric
Geophysical Research Letters, 2022 The ocean floor makes up the majority of the Earth's surface and yet, its geomorphology is not fully understood. Recent debate has focused on whether sea level changes—driven by Milankovitch glacial cycles—generate the abyssal hill fabric of the ocean ...
S. J. Sim
doaj +1 more source
Volcanica, 2023 Quantifying the depths and temperatures from which igneous rocks are derived is an important step in understanding volcanic, magmatic and mantle processes.
Fergus McNab, Patrick Ball
doaj +1 more source
Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites [PDF]
, 2006 Several methods have been developed to assess the thermal state of the mantle below oceanic ridges, islands, and plateaus, on the basis of the petrology and geochemistry of erupted lavas. One leads to the conclusion that mantle potential temperature (i.e.
Lesher, C. M. +25 more
core +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
doaj +1 more source
Petrological systematics of mid-ocean ridge basalts: Constraints on melt generation beneath ocean ridges [PDF]
, 1992 Mid-ocean ridge basalts (MORB) are a consequence of pressure-release melting beneath ocean ridges, and contain much information concerning melt formation, melt migration and heterogeneity within the upper mantle.
Langmuir, CH, Klein, EM, Plank, T
core +1 more source