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IMPACT CRATER/STRUCTURE IDENTIFICATION.pdf

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Preview of IMPACT CRATER/STRUCTURE IDENTIFICATION
🔗 Source: geology.cz
📊 Size: 195 KB
📄 Pages: 11 pages
⬇️ Downloads: 69

Summary

Approximately 160 impact structures or crater fields are currently known on Earth, with about 30% of them buried and initially detected as geophysical anomalies. The recognition of terrestrial impact structures requires the demonstration of shock metamorphism or, in small craters, meteoritic fragments. Impact structures are divided into three basic morphologic subdivisions: simple craters, complex craters, and basins. Simple craters are bowl-shaped depressions with an upraised rim, while complex craters have a central topographic peak or peaks, a broad, flat floor, and terraced, inwardly slumped rim areas. With increasing diameter, impact structures become proportionately shallower and develop more complicated rims and floors. Shock metamorphism is characterized by a progressive destruction of the original rock and mineral structure with increasing shock pressure, resulting in unique effects such as shatter cones and impact melting.

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Description

Approximately 160 impact structures or crater fields are currently known on Earth, with about 30% of them buried and initially detected as geophysical...

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  • File Format: PDF
  • File Size: 195 KB
  • Pages: 11
  • Language: EN
  • Total Downloads: 69
  • Last Updated: 3 days ago

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