Lecture 9: Oceanic Basalts

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Kellogg et al. Science 283, 1881-1884 (1999)
A Numerical Model (Van Keken and Ballentine 1998; 1999) Mid Ocean Ridges Formulation: 330,000 Tracers U+Th+K production of Heat, Ar and He. Degassing Phase changes and P,T dependant rheology Internal heating and U+Th concentration Secular cooling of mantle and core Benchmarks Surface heat flow Plate velocity Viscosity profile Caveat Not spherical Low effective temperature dependence No continental crust formation
Page 1 and 2: Lecture 9: Oceanic Basalts
Page 3 and 4: Rb, Sr, Nd and Sm are all incompati
Page 5 and 6: Concentrate solely on oceanic basal
Page 7 and 8: MORB - Relatively homogeneous sourc
Page 9 and 10: OIB - Source La Lu LREE depleted Ba
Page 11 and 12: DMM CHUR HIMU EM2 EM1 From: Hofmann
Page 13 and 14: Eiler et al. (1996) Geochim Cosmoch
Page 15 and 16: Continental Crust
Page 17 and 18: The DUPAL Anomaly Δ7/4 > 11 Δ7/4>
Page 19 and 20: 250 N 200 150 MORB 100 50 OIB Primo
Page 21: Kárason & van der Hilst (2000) AGU

Lecture 9: Oceanic Basalts

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