Lecture 9: Oceanic Basalts
Lecture 9: Oceanic Basalts
Lecture 9: Oceanic Basalts
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The Geochemical “Standard Model”<br />
Continental Crust<br />
&<br />
Lithospheric Mantle<br />
Best estimates suggest only 1/3-1/2 of<br />
mantle is depleted to form Continents.<br />
Depleted Upper Mantle<br />
Source of MORB and<br />
apparently devoid of high<br />
3<br />
He/ 4 He<br />
Primitive Lower Mantle<br />
Somewhere there is a source of<br />
primitive He which suggests<br />
mantle that has never melted
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