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.