Lecture 9: Oceanic Basalts
Lecture 9: Oceanic Basalts
Lecture 9: Oceanic Basalts
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250<br />
N<br />
200<br />
150<br />
MORB<br />
100<br />
50<br />
OIB<br />
Primordial<br />
He > 50 R a<br />
0<br />
10 20 30<br />
3<br />
He/ 4 He (R/R a )<br />
MORB = 8 ± 2Ra<br />
Some OIB (though by no means all) > 8 Ra
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