Do tectonic discrimination diagrams still have a function

2 Do tectonic discrimination diagrams still have a function  

Practising geochemists will differ in their answer to this question. Many, however, including this author, will opt for the compromise of sometimes . In seeking an answer to this question a number of factors should be considered. 

Discrimination diagrams must never be used uncritically. The possible effects of element mobility arid crystal-liquid fractionation processes must always be considered. 

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