Tag: Geology
A look at 15 million years of geology: portrait of a crystal maker
You will also be interested [EN VIDÉO] Formation of an atomic-scale crystal A crystal of salt is filmed during its formation at a resolution never before achieved: atomic! © 2021…
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…
OIB: what is it?
The term OIB, for Ocean Island Basalt (Where basalt of an oceanic island), refers to basalts having the typical chemical composition of those formed at the level of hot spotsor…
How are soils formed?
In our garden, in the forest, in the desert… the soils are incredibly diverse. But how are they structured and how do they form? You will also be interested We…
Sill: what is it?
Sills are intrusions of igneous rocks within the Earth’s crust. Of tabular geometry, they are in the form of let’s go horizontal, which insinuate themselves between older surrounding sedimentary layers.…
Pozzolan: what is it?
Pozzolan is a rock of volcanic origin, friable and not very dense, of composition essentially basalt. The term comes from Pozzuoli, an Italian city in the region of Naples where…
Metamorphic facies: what is it?
The study of metamorphic rocks is essential to understanding the tectonic history of a region. We are talking about metamorphism when a rock, whatever it is, undergoes a transformation linked…
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…
Protolith: what is it?
Some geological processes, such as metamorphismmetasomatism or chemical weathering, lead to the transformation of all types of rocks, designated as protoliths, into rocks of a different nature. The protolith therefore…