Figure 3 MD91 Figure 3. Ternary plot of the concentrations of Th-Hf-Co for the low-calcic black shales (l), n = 206. The diagram based on Taylor and McLennan (1985) 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 extends far beyond that of the end-members. As the discussion notes, it appears that Co is not immobile under conditions of sedimentation.


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