ERTH 2415 Lecture Notes - Lecture 15: Lake Wanapitei, Earth Impact Database, Impact Crater
18 Nov 2016
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Erth 2415 lecture 15: great canadian impact tour. A crater diameter is approximately 20 x the diameter of the impactor. Also, craters with a diameter larger than 5 km does not contain meteorites as the impactor vaporized on impact. Impact craters are distinguished from other circular features (i. e. , volcano sinkhole) by: Rim rocks are titled away from the crater. Large angular blocks of rock scattered around the crater. Shock minerals (indicative of extreme temp and pressure) Shatter cone: a conical fragment of host rock fractured by the shock wave generated by the impact. This includes striations radiating from the apex and terrestrial rocks: simple craters these craters have small impactors: Meteorites might be found: complex craters these craters have large impactors: There are approximately ~ 160 impact craters in the world. These craters are unevenly dispersed and can be seen through. In canada, there are ~ 25 impact craters. Canadian precambrian shield unchanged over a long period of time.
