Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.473h&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 473-474
Computer Science
Chondrites, Craters, Impact Damage, Projectile Cratering, Structural Properties (Geology), Density (Mass/Volume), Metamorphic Rocks, Pressure Effects, Shock Waves
Scientific paper
The Clearwater impact structure consists of two craters 36 km and 26 km in diameter at present surface. The distance between the centers of the craters is 30 km. The reconstruction of the impact conditions was performed on the basis of observed shock metamorphic features in the rocks from outcrops and drill hole samples and using the equations of Kieffer and Simonds (1980), Grieve et al (1981), Holsapple (1994), and Melosh (1989) with the following assumptions. The impact velocity (Vj) of the projectile was taken as 17 km/s for a paired meteorite with a diameter (L) of 1.3 km for the western crater and 1.0 km for the eastern crater. In estimating the peak shock pressures generated on impact the projectiles were approximated by basalts, having a density of rho = 2.86 g/cu cm, a value comparable to C2 chondritic densities. The target material was taken as a granite for the eastern crater. Assuming that this crater formed immediately before the impact of the larger body (concluded from the appearance of a ring in the western crater), causing a shock wave that disturbed the target of the western crater, this target material was taken as a dry sandstone. Parameters and equations used are listed.
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