Is the Lower Crust Convecting Beneath Mid-Ocean Ridges?
نویسندگان
چکیده
منابع مشابه
Melt Extraction From The Mantle Beneath Mid-Ocean Ridges
As the oceanic plates move apart at midocean ridges, rocks from Earth’s mantle, far below, rise to fill the void, mostly via slow plastic flow. As the rock approaches the top of its journey, however, partial melting occurs, so that the upper 6 kilometers of oceanic crust are composed of melts, which both erupt on the seafloor as lava and crystallize beneath the surface to form what are known as...
متن کاملThe Structure of Mid-Ocean Ridges
Mid-ocean ridges provide an important window into the processes of mantle convection and magmatism. The formation, cooling, and eventual subduction of oceanic lithosphere dominate both the large-scale dynamics of the upper mantle and the Earth’s global heat loss. The melt generated during pressure-release melting of the upwelling mantle beneath mid-ocean ridges contributes most of the annual ma...
متن کاملGeophysical and geochemical evidence for deep temperature variations beneath mid-ocean ridges.
The temperature and composition of Earth's mantle control fundamental planetary properties, including the vigor of mantle convection and the depths of the ocean basins. Seismic wave velocities, ocean ridge depths, and the composition of mid-ocean ridge basalts can all be used to determine variations in mantle temperature and composition, yet are typically considered in isolation. We show that c...
متن کاملGrain-size dynamics beneath mid-ocean ridges: Implications for permeability and melt extraction
Grain size is an important control on mantle viscosity and permeability, but is difficult or impossible to measure in situ. We construct a two-dimensional, single phase model for the steady state mean grain size beneath a mid-ocean ridge. The mantle rheology is modeled as a composite of diffusion creep, dislocation creep, dislocation accommodated grain boundary sliding, and a plastic stress lim...
متن کاملA Self-Consistent Model of Melting, Magma Migration and Buoyancy-Driven Circulation Beneath Mid-Ocean Ridges
Numerical modeling and anMysis are used to investigate the processes leading to the eruption of mantle-derived magma at mid-ocean ridges. Our model includes the following effects: melting due to decompression, magma migration by percolation, and circulation of the mantle driven by both the oceanic plates and the distribution of buoyancy beneath the ridge. The distribution of buoyancy is due to ...
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ژورنال
عنوان ژورنال: Eos
سال: 2017
ISSN: 2324-9250
DOI: 10.1029/2017eo082623