Abstract
dc:description.abstractAsteroids have diverse lithologies as reflected in the range of recovered meteorites. Size distributions of clasts of asteroid 25143 Itokawa (LL-chondrite) and Tagish Lake meteorites (ungrouped C2 carbonaceous chondrite) indicate variation in fragmentation behavior. The steeper size distribution of the carbonaceous lithology apparently reflects its lower strength. A comparison between the smooth and rough terranes on Itokawa shows that fracturing or intracrater flows apparently eliminate larger fragments. Carbonaceous chondrites’ P- and S-wave velocities, which are indicators of the elastic moduli, exhibit variation with bulk density, petrologic type, and cosmic-ray exposure ages. The hydrated carbonaceous chondrites apparently record damage from collisions with weaker objects as indicated by their decrease of elastic velocities in proportion to their cosmic ray exposure ages. These inferred collisions are frequent relative to exposure ages of other major meteorite groups. These weaker impactors are not sampled in our meteorite collections, but are evidenced in the fireball population.
Degree
thesis:*- Name thesis:degree_name
- Master of Science (MSc)
- Discipline thesis:degree_discipline
- Geoscience
- Grantor dc:publisher.institution
- Graduate Studies
- Year dc:date.issued
- 2012
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Ibrahim, El-Mahadia
- Advisor dc:contributor.advisor
-
- Hildebrand, Alan
Subjects
dc:subject × 2Rights
dc:rights- Statement dc:rights
-
- University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
- Language dc:language.iso
- eng
Identifiers
dc:identifier.*- OAI identifier oai:identifier
- oai:ucalgary.scholaris.ca:11023/194