Lect6 MetChap parts III IV V (09-10-09)

Lect6 MetChap parts III IV V (09-10-09) - Meteorite Ch...

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Unformatted text preview: Meteorite Ch Sections III, IV and V and Other Meteorite Constraints on Solar Nebula Sept. 10, 2009 REMEMBER: OUTLINE: Meteorite Chapter Sections I and II I. Introduction A. General B. From Parent Body to Earth C. Impact on Earth II. Meteorite Classification A. General B. Characteristics of Specific Classes C. Oxygen Isotopics and Interpretation OUTLINE: Met. Chapter (pdf in website) I. Meteorites of Asteroidal Origin Best Matches Ordinary Chondrites and S-asteroids: Other Results II. Chemical and Isotopic Constituents Noble Gases Interstellar grains CAIs Chondrules III. Meteorite Chronology III. Meteorites of Asteroidal Origin Best Matches: HEDs and 4 Vesta SNCs and Mars L Chondrites and 8Flora Other matches: Ordinary chondrites and Q-type and S(IV) asteroids Carbonaceous chondrites and C Complex asteroids (C, B, G and F classes) Enstatite Achondrites (aka Aubrites) and E- type asteroids Iron meteorites and some M-type asteroids Pallasites and some S-types III. Meteorites of Asteroidal Origin Ordinary Chondrites and S-asteroids: Note: in these plots the number of asteroids have not been debiased i.e., the true fraction of low albedo asteroids, such as C-types is higher. III. Meteorites of Asteroidal Origin Other Results: Population of meteorites is a very biased sample of asteroids, even NEAs (e.g., C and S types are equally abundant NEAs but Ordinary Chondrites are much more numerous than Carbonaceous Chondrites. Absence of meteorites from P and D types (except possibly Tagish Lake from D asteroids). This is likely related to a dynamical bias against objects in the outer asteroid belt and to this material being very friable. IV Chemical and Isotopic Constituents Noble Gases: Radiogenic: Radioactive decay of a heavier element e.g., 40 Ar is from 40 K Cosmogenic: Produced by nuclear reaction from high energy solar or cosmic rays (particles). Limited to surface layers (< 1 meter depth) of larger bodies or smaller fragments in space Trapped: Solar: implanted by solar wind on the surfaces of atmosphereless parent bodies, e.g., Moon and asteroids Planetary: e.g., trapped from Mars atmosphere Exotic most likely from cosmic rays IV Chemical and Isotopic Constituents Noble Gases: Radiogenic: Radioactive decay of a heavier element e.g., 40 Ar is from 40 K. Question: how? Cosmogenic: Produced by nuclear reaction from high energy solar or cosmic rays (particles)....
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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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Lect6 MetChap parts III IV V (09-10-09) - Meteorite Ch...

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