Download Exam Review I

Exam-I Review (2014) (15% of total grade)
Geochem/Habitable Planet EESC 3101 • (Lectures 1-8)
Format:
Short answer, sketches, short calculations, interpreting plots
Bring calculator, pencils/pen, may use periodic table and nuclide chart in room
Closed book, based on lecture material and problem sets - key topics outlined below:
Basic Chem Review
Nuclear: A, Z, N, nuclide chart, valley of stability,
radioactive decay mechanisms (beta, positron, e capture, alpha and fission)
Chemistry: electron orbitals, ions, cations, anions, bonds, ionic size
solid solution, charge-coupled substitution, trace elements
Noble gases, alkalis, alkaline earths, halogens, rare earths, transitions, actinides
Siderophile, lithophile, chalcophile
Nucelosynthesis
Big Bang (H, He); Stellar Fusion (what burns, what is created, T) Evolution of our Sun
R-, S-, P-, X- process; Special: H, He, Z=5, Z=8, A=209, Tc
Odd-even, multiples of 4, magic numbers (50, 82, 126)
How to explain abundance of nuclides in our solar system
Our Solar System
Meteorite origins and classes (iron, achondrites, carbonaceous chondrites)
Solar abundances, atomic absorption; Planets, density and composition
Condensation T and differentiation of the solar nebula; refractory, volatile
Terrestrial planets = 16O, 24Mg, 28Si, 56Fe (why not others?)
Ages and Isotopes
Rb-Sr, radioactive decay and isochron method; initial v. radiogenic
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Nd = Np (e t -1) + Ndi - know this equation - decay constant vs. half-life
U-Th-Pb system and half lives, initial Pb (all or none?)
Pb 207/206 model ages, sketch concordia diagram; Age of CAI, achondrites
U-Th steady-state constraints on nucleosynthetic production in galaxy
Extinct Nuclides (26Al-26Mg, 182Hf-182W); constraints on age of solar nebula
Early Earth-Core-Moon
Oldest rocks, zircons, concordia; Extinct Nuclides (182Hf) and constraints on core formation
Basic Earth structure, evidence for core; Mass balance
Goldschmidt's elements (litho-, chalco-, sidero-phile), and examples
Light elements in core - candidates, silicon evidence
Pressure-depth, P = pgz, GPa and kb
Optional (topic of Tuesday’s lecture); TBD
Moon density, volatiles (K/U), oxygen isotopes, Hf iso. Capture, co-accretion, impact theories
K/T boundary impact, Ir, Os isotopes and evolution