Fig. 4From: Lithological structure of western Pacific lithosphere reconstructed from mantle xenoliths in a petit-spot volcanoGeochemistry of the petit-spot basalts. a Total alkali silica diagram. Triangles and circles show the whole-rock and quenched glass compositions, respectively. The whole-rock composition of 6K#1466 basalts (pink triangles) is highly silica-undersaturated. The compositions previously reported at petit-spots from the NW Pacific are represented as open triangles and circles (Hirano et al. 2006; Machida et al. 2015; Sato et al. 2018). b Primitive mantle normalized trace-element compositions of basalts. The pink lines are 6K#1466 basalts in this study, and the blue lines are those reported by Hirano et al. (2019). The gray lines describe previously reported petit-spots from the NW Pacific (Hirano et al. 2006; Machida et al. 2015; Sato et al. 2018). Dotted lines describe the values of representative OIBs (Oceanic Island Basalts) and primitive mantle, from Sun and McDonough (1989). The numerical data are provided in Table 1Back to article page