fig31.htm

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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