Skip Navigation Links
 - Rare minerals
 - Fulgurites
 - Shock-metamorphosed rocksExpand  - Shock-metamorphosed rocks
 - ImpactitesExpand  - Impactites
 - Tektites
Systemaic minerals:
Visitors online: 17
Homepage visits: 12330
Diameter:14 km
Age:900,000 ± 100,000 years
Coordinates:48° 24'N, 60° 58'E
Link to Google Maps: here
KML file for Google Earth: here
Associated specimens:


Most impact structures have been moderately to severely eroded so that their crater rim morphology is no longer a strong clue to their presence and nature. Worn-down craters are sometimes referred to as astroblemes (literally, "star wounds"). Detection in space images is therefore difficult; breccias with associated shock metamorphic features are then the best indicators. Still, processed imagery can reveal signs of an astrobleme (sometimes drainage will adjust to the underlying structure, with a tendency towards circularity). A relatively young ( 900,000 years) impact crater, the Zhamanshin structure (13 km; 8 miles) in Kazahkstan, is a case in point. Examine first this Landsat false color composite; you may be hard-pressed to find the actual crater, for, despite its youth, it has been severely eroded.

This next image of Zhamanshin was generated from all non-thermal Landsat TM bands regrouped into Principal Components. Shown above are Components 2, 3, and 4 in Red, Green, and Blue