Fig. 4: Variation in trace element ratios with longitude.
From: Synchronous motion of the Easter mantle plume and the East Pacific Rise

La/Sm, and Nb/Zr ratios are generally lower for samples that erupted on or closer to the microplate (blue symbols for dated and open symbols for undated) compared to those that erupted on the Pacific plate (red symbols). Dashed lines show average normal MORB (NMORB)106.