GEO 1301 Lecture Notes - Lecture 5: Continental Crust, Silicate Minerals, Unconformity
4 Apr 2016
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Birth of the sun, formaion of planets (terrestrial vs jovian planets) (4. 55 ga) 1. 2 difereniaion of the earth: homogeneous accreion, accreion of non-difereniated mater, layer difereniaion based on density of materials, heterogeneous accreion, sequenial accreion of planeismals of difering composiions. Paleozoic (545-245 ma) marine organisms to pangaea. Mesozoic (245-66. 4 ma) dinosaurs to exincion; atlanic ocean and rockies begin forming. Oldest rock 4. 3 ga, jonathan o"niell. Isotopes: atoms w/ the same number of protons, but a diferent number of neutrons therefore a diferent mass. Radioacivity results from the instability of the nucleus (unstable isotope), which disintegrates and thus releases energy. 30% of earth"s surface average 30-50km less dense than o. c. (felsic to intermediate[silicates]) 70% of earth"s surface (~area covered by oceans) average 5-10km. Denser than c. c. (maic [magnesium and iron]) igneous rocks: basals (upper) and gabbro (lower) Olivine peridoite (uppermost part solid, remaining plasic: lower mantle. Perovskite peridoite (solid; very very viscous [lows 10-
