GEO 330 Lecture Notes - Lecture 19: Shock Metamorphism, Planetary Differentiation, Cosmic Ray
31 Mar 2018
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Age -- almost all martian meteorites are relatively young volcanic rocks (180-1300my) with composition similar to terrestrial basalts. Oxygen isotopes are distinct (16o, 17o, 18o) from terrestrial rocks and group all 34 meteorites together. Trapped gases -- the isotopic composition of gases trapped in the meteorites is almost identical to the martian atmosphere (comparison with viking measurements) Late (cid:272)rystallizatio(cid:374) ages of snc"s (cid:449)as origi(cid:374)al (cid:272)lue that they are fro(cid:373) mars. The duration of volcanic activity on a planet is correlated to its size. Snc"s (cid:373)ust ha(cid:448)e origi(cid:374)ated fro(cid:373) a large (cid:271)ody. Argument does not definitively point to mars as source. Origin of snc meteorites -- shock glass inclusions. Mars atmospheric gases were trapped in eeta79001 and other meteorites during the impact process. The abundance of most molecules matches that measured in the martian atmosphere measured by the viking landers. Snc meteorites -- planetary differentiation and crystallization ages.
