Tag: partial fusion
How is a new ocean born?
On Earth, no ocean is more than 200 million years old, testifying to the great cyclicity of tectonic processes. Very regularly, some oceans close while others open up. But how…
MORB: what is it?
The term MORB, for Mid-Oceanic Ridge Basalt (basalt mid-ocean ridge, in French) refers to basalts with the typical chemical composition of those formed at ridges. In particular, they make up…
What is the composition of the oceanic crust?
The oceanic crust is one of the two components of the earth’s crust. Very different from continental crust, it is continuously formed at mid-ocean ridges. However, its composition is very…
Migmatitis: what is it?
Under certain conditions of pressure and temperature, the rocks that make up the continental crust can melt. However, the rocks of the earth’s crust have very varied compositions. They are…