Chap 19 Met-Ast-Comets-V4

Chap 19 Met-Ast-Comets-V4 - Meteorite Types Iron and Stony...

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Meteorite Types Iron and Stony meteorites are the two main meteorites types found on Earth. Iron meteorites contain iron, nickel, and other heavy metals like cobalt, zinc, etc. They show Widmanstatten patterns (lower left fig.) when sliced and acid-etched. This is evidence of crystal growth very during slow cooling – few degrees/10 6 yrs. Of what are stony meteorites made? Iron meteorite Stony meteorite Chondrites are stony meteorites that have glassy inclusions called chondrules. Carbonacious chondrites contain a high density of volatiles like H 2 O, CH 4 , C 2 H 6 . Achondrites are stony meteorites that contain no chondrules or volatiles. What does this indicate? Mostly silicates – sand and rock as on Earth. Meteorite experienced high temperatures during the course of its history.
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Origin of Meteorite Types What is the difference between meteroids, meteors, and meteorites? Most meteorites result from collisions with asteroids. Many are large enough to have melted and partially differentiated, and others are too small to have melted. What type of meteorites come from a collision as in frame 1? What type from a collision as in frame 2? And what type from a collision as in frame 3? Impacts on small asteroids that never melted produce chondrites in the warmer inner asteroid belt, and carbonacious chondrites in the colder outer asteroid belt. What are the source of the majority of meteors seen on Earth? Both chondrites and achondrites.
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This note was uploaded on 04/25/2008 for the course PHY 122 taught by Professor Bernstein during the Spring '08 term at SUNY Buffalo.

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Chap 19 Met-Ast-Comets-V4 - Meteorite Types Iron and Stony...

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