Paleogeology

Paleogeology, Paleoclimate, in relation to Evolution of Life on Earth

impact metamorphism

Impact metamorphism involves ultrahigh compression that results either from the impact of an extraterrestrial object, such as a meteorite (bolide) or during an extremely violent volcanic eruption.

Impact metamorphism is characterized by ultrahigh pressure conditions and low temperature, and produces characteristic high-pressure textures and minerals, such as SiO2 polymorphs coesite and stishovite.

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