GEOL 212 Study Guide - Quiz Guide: Metasomatism, Stony-Iron Meteorite, Comet Dust
27 Dec 2017
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Document Summary
Origins: we have discussed the origin of many dust grains that are vaporized in the atmosphere as meteors - cometary dust. Most meteorites, however, originate in the asteroid belt. Indeed, in cases where meteorite falls have been tracked by multiple cameras, it has been possible to calculate the meteoroid"s orbit, confirming their asteroid belt origins. Note: to assess these percentages, we count only meteorite fall discoveries. This is to counter the collecting bias that favors the finding of iron meteorites because they just look so different. If we were to base percentages on finds, then iron meteorites would make up 40%. Iron, stony, and stony-iron meteorites are considered remnants of differentiated bodies that were subsequently fractured by collisions. They enable us to understand the chemistry of the raw material from which the. Chondrules: beads of silicate material containing up to 15% iron that have undergone melting prior to being incorporated in the meteorite.
