Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..707r&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 4, pp. 707-712 (2000).
Computer Science
Scientific paper
Based on detailed field investigations and the study of impact breccias at the Charlevoix impact structure (Québec) a structural analysis is given. This analysis shows that the annular arrangement of both topography and lithology can be applied to subdivide the two craters discussed in this review. Successive rings characterize the central uplift and its collapsed ring graben in the Charlevoix structure. Fault breccias show an annular distribution and indicate diverse directions of movement suggesting progressive readjustment. They formed cohesionless products inside fault planes, named mylolisthenite, and are believed to have acted as lubricants during the modification stage of the formation of the structure: listric readjustment by gravity after the formation of the transient crater. The Sudbury Structure (Ontario) shows fault breccias in a concentric arrangement similar to that of Charlevoix. It may be compared with the Charlevoix structure applying the same mechanical readjustment model with deep listric faults. The only difference is the amount of the rise structural uplift, i.e., height of central uplift, which is less important in the larger impact structure.
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