Lecture 9: Oceanic Basalts

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The Geochemical “Standard Model” Continental Crust & Lithospheric Mantle Best estimates suggest only 1/3-1/2 of mantle is depleted to form Continents. Depleted Upper Mantle Source of MORB and apparently devoid of high 3 He/ 4 He Primitive Lower Mantle Somewhere there is a source of primitive He which suggests mantle that has never melted
Kárason & van der Hilst (2000) AGU Monog. 121, 277-288
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: 250 N 200 150 MORB 100 50 OIB Primo
Page 23 and 24: A Numerical Model (Van Keken and Ba

Lecture 9: Oceanic Basalts

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