Lect2 Meteorites Part I (08-27-09)

Lect2 Meteorites Part I (08-27-09) - I Definitions II Types...

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Unformatted text preview: I. Definitions II. Types III. Origin of Meteorites Intro to Meteorites • Meteors and Meteorites. – Meteor : atmospheric phenomenon produced by the entry of an interplanetary particle to Earth’s atmosphere. Also known as a shooting star – Meteorite : when a solid object survives atmospheric entry and reaches Earth’s surface – Most meteors are from comets – Most meteorites are from asteroids I. Definitions Meteors • Irons • Stony-Irons • Stones (~75% of all meteorites) II. Types of Meteorites Iron Meteorite Stony-Iron Stony Meteorite I. Definitions II. Types III. Origin of Meteorites Intro to Meteorites II. Types of Meteorites Meteorite formed from material condensed and accreted from gas and dust in the solar nebula Primitive – Minimal processing Processed- Extensive compositional and mineralogical changes Coarsest Classification: Stones : Chondrites - primitive Achondrites - igneous Stony-Irons- igneous Irons- igneous Asteroids and comets accreted at different distances from the Sun, resulting in different compositions including ice contents Similarly within the asteroid belts there are compositional differences • Irons • Stony-Irons • Stones (~75% of all meteorites) – Chondrites • Carbonaceous • Enstatite • Ordinary – Achondrites • • II. Types of Meteorites • Irons • Stony-Irons • Stones II. Types of Meteorites Iron Stone Differenciated Asteroid Undifferenciated Asteroid Iron and stone We stopped here on Aug. 27 2009 III. Origin of Meteorites • Asteroids (more than 95%) – Asteroids collide with each other and breakup, some of those fragments become meteorites • Mars (a few percent) – Impacts on Mars kick martian material into space and some ends up falling on Earth • Moon (a few percent) – Also because of impacts • Comets? Venus? Mercury? – So far no meteorites from these bodies have been identified • Irons and Stony-Irons are excavated by collisions III. Origin of Meteorites Iron Stone Differenciated Asteroid Undifferenciated Asteroid Iron and stone Remember the resonances? They can transport fragments to Earth •...
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Lect2 Meteorites Part I (08-27-09) - I Definitions II Types...

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