Feasibility of AFC models for the petrogenesis of calc-alkaline magma series

Malcolm Roberts, John Clemens

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


One of the most popular petrogenetic concepts is that of simultaneous assimilation and fractional crystallisation (AFC). The equations governing these processes are well known and widely applied. The power and attraction of the model are that, with the minimum of constraints, petrogenetic schemes can be erected for essentially any group of rocks. These models are usually based on the observed variations in a small number of trace elements and/or isotopic systems. In this paper we have generated well-constrained AFC models for the Variscan, calc-alkaline Quérigut complex in the French Pyrénées. Our models are based on geological constraints on the identities of the parent magma and candidate assimilants, and the Sm-Nd and Rb-Sr isotope systematics of the rocks. The modelling is successful in mimicking the isotope array for the actual rocks. However, the results are massively inconsistent with …
Original languageEnglish
Pages (from-to)139-147
JournalContributions to Mineralogy & Petrology
Issue number2
Publication statusPublished - 1 Aug 1995
Externally publishedYes


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