Figure 7. Plot of La/Yb v. Zr/Nb showing melt curves (or lines) obtained using the non-modal batch melting model (see Aldanmaz et al. 2000 and Aldanmaz, 2002 for details). The parameters and common geochemical reservoirs used in the diagram are as described in Aldanmaz et al.(2000). The enriched mantle (EM) is assumed to have incompatible element concentrations similar to that proposed in Aldanmaz et al.(2006). The mantle array is defined using melt-residual compositional trends from depleted MORB mantle (DMM) and primitive mantle (PM; similar in composition to CI chondrite) compositions. Mantle depletion and enrichment trends are defined by melt extraction from the mantle (towards the residues) and melt addition to the mantle (or influx of material from outside the mantle prior to solid-state mixing and homogenization) respectively. The melting trends from depleted MORB mantle and enriched mantle compositions are shown by solid curves (or lines) while the dashed curves (or lines) represent the melting trends from primitive mantle. Thick marks on each curve (or line) correspond to degrees of partial melting for a given mantle source. MORB field defines the compositional range of basalts from the East Pacific Rise (Niu et al. 2001).