ERSC 2P21 Lecture Notes - Lecture 11: Planetary Differentiation, Biotite, Forsterite
19 Dec 2018
School
Department
Course
Professor
Document Summary
Lecture 11: composition of the earth that represent molten. The chemical make up of the earth and its minerals. Planetary accretion during formation of the solar system, Chondrites: stony meteorites that formed early in the solar nebula. **to a first approximation, we can use carbonaceous (c1) chondrites to estimate the composition of the bulk. Planetary differentiation is the separating out of different constituents with different physical and chemical properties, where the body develops into compositionally distinct layers (metallic core, stony mantle, and crust). Oxygen makes up 94 vol% of the crust . So you can consider the crust as close- packed oxygen with interstitial cations! Rock-forming minerals in the crust are typically members of the silicate, oxide, and carbonate groups (all obearing). Two modes of occurrence: make their own minerals, dispersed or or taken up into other minerals. Decay of u isotopes causes dark halos around zircons (dispersed element).
