ERTH 2415 Lecture Notes - Lecture 3: Gravimeter, Impact Crater, Shatter Cone
28 Aug 2018
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Document Summary
Impact craters: crater diameter 20 x impactor diameter, crater with diameter > 5 km do not contain meteorites, impactor vaporized on impact. Shatter cone: a conical fragment of host rock fractured by the shock wave generated by the impact, striations radiating from the apex, terrestrial rock. Simple craters: small impactor -> simple crater, diameter < 5 km, raised rim, concave bottom without a central uplift, meteorites might be found. Complex craters: large impactor -> complex crater, diameter > 5 km, collapsed rim, central uplift, no meteorites. Impact craters in canada: impact craters in canada, large territory, rocks of the canadian precambrian shield unchanged over a long peiod of time, long history of cratering, craters are preserved. Sudbury, on (1850 3 ma: largest and oldest impact crater in canada, heavily deformed by regional movements along faults. Present day: elliptical structure: distinctive features, circular feature, shatter cone.
