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| " | OIBs are more
heterogeneous than MORBs |
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| " | But the same
trends are seen in MORBs and |
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| OIBs |
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| " | There is a hidden
reservoir |
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| = | Slightly
depleted=lower mantle |
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| = | Primitive=50% of
the mantle |
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| = | Enriched (D''
with MORBs composition) |
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