Fig. 7 in Basalts from Rose Atoll, American Samoa

Fig. 7. Ba/Nb vs La/Nb diagram of Rose Atoll basalt plots related to N-MORB, Primitive Mantle (cross) and fields of Pacific and Atlantic plume basalts (based on Sun & McDonough, 1989). Solid thick line: Rose Atoll basalt field; thick dotted line: Alexa Bank field; solid thin line: Hawaiian plume tholeiites and Loihi alkalic to transitional basalt fields; thin dashed lines: Atlantic plume basalt fields (St Helena SH, Ascension Island AI, Tristan da Cunah TC, Gough island GI, and Walvis Ridge WR). Rose Atoll data (A, B, C and Agl) from this paper. Samoan plume islands and seamount fields (9 analyses) from Johnson et al. (1986) and Wallis Island (12 analyses) from Price et al. (1991). Hawaiian plume tholeiites (19 analyses, excluding Koolau and other separate source basalts) from Norman & Garcia (1999). Loihi alkalic to transitional basalts (20 analyses) from Garcia et al. (1995).