Figure 4 MD91 Figure 4. Ternary plot of the concentrations of Th-Hf-0.1*Rb for the low-calcic black shales (l), n = 206. Based on a modification of a diagram used by Taylor and McLennan (1985), it uses the concentrations of these elements in the upper continental crust (UC), bulk continental crust, and oceanic crust as end-members to determine provenance. Note that the field of the samples no longer extends far beyond that of the end-members. Rb has been substituted for Co as this element is generally considered to be immobile (Wood et al., 1979; Pearce et al., 1984). It was not possible to present the data for the PAAS as insufficient information was presented in Taylor and McLennan (1985) to do so.


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