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The Elastic Properties of Carbonaceous Chondrites

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ucalgary_2012_Ibrahim_Elmahadia.pdf (3.930Mb)
Advisor
Hildebrand, Alan
Author
Ibrahim, El-Mahadia
Accessioned
2012-09-13T21:17:49Z
Available
2012-11-13T08:01:37Z
Issued
2012-09-13
Submitted
2012
Other
Earth Sciences
Planetary Science
Geology
Geophysics
Subject
Geology
Geophysics
Type
Thesis
Metadata
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Abstract
Asteroids 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.
Corporate
University of Calgary
Faculty
Graduate Studies
Doi
http://dx.doi.org/10.11575/PRISM/28122
Uri
http://hdl.handle.net/11023/194
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