Mantle thermal pulses below the Mid-Atlantic ridge and temporal variations in the formation of oceanic lithosphere

Article Abstract:

Research reveals that intermittent buoyant 'active' convective upwelling from the Mid-Alantic ridge can cause 3-4-Myr oscillaions of degree of melting and crustal thickness. The solid mantle upwelling velocity beneath the ridge varies with time , being highest during high degree melting. Furthermore, most of the Mid-Atlantic Ridge is hot due to southward flow of hot mantle.

Italy, Earth, Thermal properties, Upwelling (Oceanography), Mantle (Geology), Mid-Atlantic Ridge, Lithosphere

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Deep origin and hot melting of an Archaean orogenic peridotite massif in Norway

Article Abstract:

A study on orogenic peridotites from Otroy, western Norway showing that the peridotites underwent extensive melting during upwelling from depths of 350 kilometers or more, forming a garnet-bearing cratonic root in a single melting event is presented. These peridotites appear to be the residue after Archaean aluminum depleted komatiite magmatism.

Peridotite, Petrogenesis, Magmatic differentiation

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Water-rich basalts at mid-ocean-ridge cold spots

Article Abstract:

Unusually high water content in basaltic glasses from a cold region of the mid-ocean-ridge system in the equatorial Atlantic Ocean is reported. It is concluded that oceanic basalts are water-rich not only near hotspots, but also at 'cold spots'.

Atlantic Ocean, Basalt, Mid-ocean ridges

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