shock metamorphism

Shock metamorphism is a geological process that occurs due to the intense pressure and temperature generated by a meteorite impact. This rapid and extreme event causes significant deformation and alteration of the bedrock at the impact site, forming what are known as impact structures. These structures are characterized by features like shatter cones, which are distinctive conical fractures radiating from the point of impact.1

Metamorphism, in general, involves the transformation of existing rocks (igneous, sedimentary, or other metamorphic rocks) due to changes in temperature, pressure, and chemical environment, without melting. While regional and contact metamorphism are driven by large-scale geological processes like tectonic plate movements or magma intrusions, shock metamorphism is specifically linked to the sudden, high-energy event of an impact. The identification of impact structures relies on these unique shock features, as surface evidence like craters can be eroded over time.2341