Tag: ocean ridge
Passive continental margin: what is it?
“Continental margin” is the term used to define the transition zone between a continental crust and an oceanic crust. There are two types of continental margins: the active margin and…
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…
Hot spots that are too cold and a geodynamic model of the Earth’s mantle to be reviewed
A new study questions the deep origin of some hot spots thanks to an analysis of their temperature: they are colder than we thought. You will also be interested [EN…