- Source: Impact structure
An impact structure is a generally circular or craterlike geologic structure of deformed bedrock or sediment produced by impact on a planetary surface, whatever the stage of erosion of the structure. In contrast, an impact crater is the surface expression of an impact structure. In many cases, on Earth, the impact crater has been destroyed by erosion, leaving only the deformed rock or sediment of the impact structure behind. This is the fate of almost all old impact craters on Earth, unlike the ancient pristine craters preserved on the Moon and other geologically inactive rocky bodies with old surfaces in the Solar System. Impact structure is synonymous with the less commonly used term astrobleme meaning "star wound".
In an impact structure, the typical visible and topographic expressions of an impact crater are no longer obvious. Any meteorite fragments that may once have been present would be long since eroded away. Possible impact structures may be initially recognized by their anomalous geological character or geophysical expression. These may still be confirmed as impact structures by the presence of shocked minerals (particularly shocked quartz), shatter cones, geochemical evidence of extraterrestrial material or other methods.
See also
Complex crater
Earth Impact Database
Multi-ringed basin
Impact event
List of craters in the Solar System
List of largest craters in the Solar System
List of impact structures on Earth
List of possible impact structures on Earth
Traces of Catastrophe book from Lunar and Planetary Institute - comprehensive reference on impact crater science
Peak ring
References
External links
Terrestrial Impact Craters at the Lunar and Planetary Institute
Earth Impact Database
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