Oceanic lithosphere
The ic lithosphere Océan constitutes the part of the Lithosphère made up of generally localized oceanic crust at the bottom of the oceans of the dorsal to the abyssal plain.
Generally thick of less than 100 km, it is however denser than the continental Lithosphère, with an average density of 3,3g/cm ³. It is made up of Gabbro S and Basalte S in the crustal part (the oceanic crust) and of Péridotite S in the mantellic part (lithospheric coat).
The major part of the current oceanic lithosphere is old of less than 200 million years, because it disappears in the coat asthenospheric at the time of the Subduction while a new oceanic lithosphere is formed on the level of the dorsals per accretion. It thickens while moving away from the dorsal and its density increases. When the latter exceeds the density of the subjacent asthenosphere, balance becomes unstable and the oceanic lithosphere which “floats” on the asthenosphere can enter in Subduction.
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