Elemental abundances seamounts

Trace element abundances of rocks dredged from the Sicily Channel seamounts are scarce (Beccaluva et al. 1981 Calanchi et al. 1989). They show variable concentrations, with incompatible element abundances increasing from tholeiitic to alkaline basalts and basanites (Fig. 8.17). Mantle normalised incompatible elements define bell-shaped patterns (not shown), which resemble those for the exposed rocks in the Sicily Channel. 

Figure 3 Plots of element abundances versus depth below seafloor (meters) for serpentinized ultramafic clasts from hole 779A in Conical Seamount, Mariana fore-arc, collected during ODP leg 125 (Ryan et al. (1996a)). Shaded fields represent the range of enriched and depleted mantle compositions (source McDonough and Sun, 1995).

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