Lect4 Burbine (09-03-09)

Lect4 Burbine (09-03-09) - Assignments: For all Future...

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Assignments: For all Future reading assignments everyone must turn in a one or two-page outline of the assigned chapter. This will count as part of your grade. Do not get stuck on details, try to understand the main points even if you do not know the details, such as mineral names etc. Remember: Next week’s assignment is Meteorite Chapter parts I and II.
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Meteoritic Parent Bodies by Burbine et al.
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OUTLINE 1. Introduction 2. Diversity of Meteorites and their Parent Bodies 3. Asteroids to Earth: The Dynamic Connection 4. Determining Meteorite Parent Bodies 5. Meteorites and Possible Parent bodies 6. Conclusions and Future Work
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1. Introduction Chemical and petrological evidence: almost all meteorites originated in sub-planetary sized objects that formed about 4.56 billion years ago (i.e., asteroids) Some (~50) come from Mars and the Moon Why would it be harder to get Meteorites from Venus than Mars? Goal of chapter: determine number and identity of meteoritic parent bodies (definitions of “parent” and “source” bodies. Source body: greater than a few meters, parent body most likely greater than a few km)
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2. Diversity of Meteorites and their Parent Bodies Meteorites provide: Best evidence of chemical and physical makeup of asteroids Processes that formed and modified asteroids Number of distinct asteroids sampled Bulk composition and mineralogy of meteorites: original composition of parent and amount of heating and melting Those that experienced heating but not melting: Chondrites (most primitive meteorites, but NOT, as the chapter states, most primitive material in solar system ). They contain nebular components and records of formation 4.56 X 10 9 years ago Those that experienced melting and differentiation: achondrites, stony-irons and irons
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2.1 Classification Table 1. Meteorite groups based on mineralogy and oxygen isotopic composition: 8 major groups and more than 39 subgroups Table 2. Meteorite groups and their postulated parent bodies. Note that : 1. Ordinary Chondrites (H, L and LL) are assigned to S(IV) asteroids 2. HED’s are assigned to 4 Vesta
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This note was uploaded on 11/09/2009 for the course AST 4142 taught by Professor Campins during the Fall '09 term at University of Central Florida.

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Lect4 Burbine (09-03-09) - Assignments: For all Future...

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