Figure 9. Th/Ta vs. La/Yb diagram for metabasites of the Onot block.
1 - amphibolites from enclaves in plagiogneisses (tonalite-trondhjemite suite), 2 - lower crustal
mafic granulites of the Onot block, 3 - Late Archean basalts of the Onot greenstone belt. Outlined
are fields for basalts of the Ontong Java Plateau (OJP) and island arc volcanics (ARCS)
[Condie, 1994, 1997b].
PM = primitive mantle, DM = depleted mantle.