To determine whether the formation of a ring crater or ring structure is related to the impact of meteorites, the key is to find out whether the rock of the crater has been subjected to shock waves accompanied by a strong impact of meteorites. Under the action of a strong shock wave, the target rock will undergo shock metamorphism. Regarding the identification of meteorite impact craters, the international scientific community has clarified three diagnostic indicators of shock metamorphism: mineral smashing surface sheeting, mineral smashing glass, and smashing mineral high pressure Polymorphic transformation. In nature, except for the shock wave effect caused by the overspeed impact of extraterrestrial bodies, any other natural process or geological effect cannot trigger such mineral physical changes in the geological body. If one of the above three indicators can be found in the surface ring geological structure, it can be determined that a meteorite impact event has occurred in this area.
text, what about a ring pit or ring structure?
Strong earthquakes may trigger a high-pressure polymorphic transformation of knocking minerals.