Lecture 9: Oceanic Basalts
Lecture 9: Oceanic Basalts
Lecture 9: Oceanic Basalts
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OIB –<br />
Source<br />
La Lu<br />
LREE depleted<br />
Basalt<br />
La Lu<br />
LREE enriched<br />
Apparent paradox is mainly due to<br />
differences in the degree of partial<br />
melting.<br />
If OIB represent small melt fractions<br />
than MORB, then even a relatively<br />
depleted source can yield LREEenriched<br />
melts – especially so if<br />
melting starts in the garnet field<br />
because HREE are compatible in<br />
garnet.<br />
However, isotope data still indicate<br />
that OIB sample (or preserve) a<br />
greater variety of mantle<br />
heterogeneity.
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