Lecture 9: Oceanic Basalts
Lecture 9: Oceanic Basalts
Lecture 9: Oceanic Basalts
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Source<br />
Basalt<br />
MORB<br />
La<br />
OIB<br />
Lu<br />
La<br />
Lu<br />
Many OIB fall between CHUR<br />
and MORB implying a source<br />
that is depleted relative to<br />
CHUR but less depleted than<br />
the MORB source.<br />
143<br />
Nd/ 144 Nd<br />
or ε Nd<br />
Depleted<br />
Quadrant<br />
CHUR<br />
Continental<br />
Crust<br />
Enriched<br />
Quadrant<br />
La<br />
Lu<br />
However, OIB magmas tend<br />
to be enriched in<br />
incompatible trace elements<br />
So, Rb/Sr and Sm/Nd<br />
observed in OIB do not<br />
reflect the “time-integrated”<br />
Rb/Sr and Sm/Nd of the OIBsource<br />
mantle represented<br />
by the isotope data.<br />
87<br />
Sr/ 86 Sr<br />
or ε Sr
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