Experimentally determined partition coefficients () and geochemical signatures of arc basalt. (A) Partition coefficients of Pb, Rb, and Sr between aqueous fluids and coexisting haplogranite (HGR) or jadeite (Jd) melts at HTHP conditions as a function of pressure. Open symbols denote data obtained in the Cl-free system, and filled symbols denote data obtained in the 5 M (Na, K)Cl/kg water system. (B) A schematic diagram showing the geochemical pattern for Mariana arc basalt with three components normalized by Yb. Aqueous fluid-like and melt-like components represent shallow and deep subduction components in the original Figure two (C) of Pearce et al. (2005) using the data from Elliott et al. (1997); these components are attributed to aqueous fluids and sediment-derived melt or supercritical fluids, respectively (Elliott et al. 1997; Pearce et al. 2005; Hanyu et al. 2012).