
Figure 31.
3 He/
4 He-
87 Sr/
86 Sr diagram for compositions of the volcanics studied. Lava fields are
from oceanic mantle plumes of Loihi and Iceland, the continental Ethiopian plume [{\it Marty et al.,} 1996],
and volcanics of the active Pacific continental margin: C, continental crust; PHEM,
primordial helium enriched mantle [{\it Farley et al.,} 1992]; MORB, oceanic upper mantle
[{\it Zindler and Hart,} 1986]. The rest of notation is the same as in Figure 22.
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