OIB enriched in incompatibles but different OIBs are different

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OIB enriched in incompatibles but different OIBs
are different
MORB formed from already depleted mantle
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Mixing MORB--OIB--CC??
EM-2 enriched (cont. seds)
Regions depleted in incompatibles have low 87/86
but high 143/144
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Apparent age is 2 Gyr
No simple trend -- CC is in middle -- therefore
not back-mixing of CC into mantle
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Note convergence of HIMU and MORB at FOZO
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Many hotspots have limited range of isotopic
compositions
EM1 and EM2 are concentrated south of equator --
DUPAL anomaly
Indian ocean MORB is different from Atlantic and
Pacific
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