Tag: geochemistry
The shell of molluscs: memory of the environment
The shell of molluscs can help replenish the living environment of the organism. The study of the growth and geochemistry of the shells makes it possible to trace the variations…
The amount of oxygen on Earth would have long stagnated at very low levels
The amount of oxygen in the atmosphere would have long stagnated at particularly low levels, impacting the development of the biosphere. New results that could lead to a revision of…
The current continental crust differs from the primitive earth’s crust
At the very beginning, our Planet was only molten rocks. The cooling of its surface gradually formed the primitive continental crust which would allow to install the future favorable conditions…
The primitive moon would have cooled in just 20 million years!
If the circumstances of the formation of the Moon are now rather well defined, the way in which our natural satellite evolved thermally during the early stages of its history…
The enigmatic formation of the first continental crust
The continental crust which forms the continents that we know today was formed during the first stages of the Earth’s evolution, in the Hadean style. During this period, the early…
When nature plays Tetris to shape the structure of minerals
Who has never marveled at the perfection of a quartz crystal or the cubic shape so clean of a pyrite crystal? The perfection of certain crystals may suggest that the…
Gneiss: what is it?
The gneiss is a metamorphic rock composing the continental crust. It mainly contains quartz, micas, feldspars plagioclases and sometimes alkaline feldspars. The color of the rock is variable, but often…
Metamorphism: what is it?
Metamorphism is an essential process in geology. It represents all the transformations that a rock undergoes when it is subjected to an increase in pressure and / or temperature. The…