Fig. 15 Ren, Z.-Y., Takahashi, E., Orihashi, Y., Johnson, K. T. M. 30 northern rift cone Primitive Mantle Normalized S691-4B northern rift 25 20 arcuate tip S691-5A,B southern rift 15 10 5 0 Rb Ba Th U Nb Ta La Ce Pr Sr NdSm Zr Hf Eu GdDy Y Er Yb Elements
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