Earth Sciences 1086F/G Lecture Notes - Lecture 13: Martian Meteorite, Basalt, Incandescence
3 Jul 2020
School
Department
Course
Professor
Document Summary
Categories of meteorites: find: stumble across and no info of how it got there, fall: entry through atmosphere is witnessed, someone recovered it. Stony-irons: 50-50 mic of same metal alloys and non-metallic silicate/oxide. Achondrites: igneous rocks that have been partially melted and recrystallized. Chondrites: cosmic sediment that have never been altered nor melted since first: small round inclusions in chondrites called chondrules . Formed from condensed hot cloud of gas/dust by flash-melting of dust in nebula. Undergo accretion: carbonaceous chondrites are important, the carbon may be diamonds, graphite, salts. Achondrites: magma formed by melting pre-existing rock at high temp, when solid becomes igneous, material that didn"t melt is residual rock. *if fragment is product of crystallization from magma its not igneous but achondrite, if its residual than primitive achondrite. Interplanetary dust particles: smallest meteoroids that orbit sun, composed of silicate minerals: don"t remain in orbit for long time, pressure of suns radiation push particles out of solar system.
