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Constraints on the calculation and use of mineral/melt and two-mineral partition coefficients for Ti (D Ti ) have been derived from current knowledge of the distinct crystal-chemical mechanisms for the incorporation of Ti 4+  in the amphibole structure as follows: (1) mineral/melt partition coefficients for Ti, and other tetravalent high field-strength elements (HFSE), can be compared only when considering the fraction of Ti 4+  that enters the same structural site; (2) accurate two-mineral partition coefficients can be obtained only when considering the fraction of Ti 4+  that is involved in the same crystal-chemical mechanism in the two relevant phases (i.e.,  M2 Ti 4+  and  M1 Ti 4+  for amphibole and clinopyroxene, respectively).

A crystal chemical re-evaluation of amphibole/melt and amphibole/clinopyroxene D Ti values in petrogenetic studies