discrimination of fertile and barren granites,Īmini, S., Mazhari, A., Ghalamghash, J., 2004.The Ta-bearing samples, which are situated in the fertile field in the diagram, are those which have high Nb and Ta contents, elevated Ga content and the lowest Nb/Ta and Zr/Hf values. Firstly, a database composed of Ta-bearing and barren granitic systems was created, then geochemical behavior of trace elements was studied, and statistical investigations were done using GCDkit software, which resulted in the Ga-(Nb+Ta)-(Nb/Ta)(Zr/Hf) ternary diagram which can distinguish the non-mineralized granites from productive ones. A ternary diagram for S-type peraluminous granites has been obtained in this study. These diagrams distinguish samples by simultaneous means of positive and/or negative correlations between variables. Diagrams comprising more than one element can make discrimination of productive and barren samples more valid. Discriminating barren and fertile intrusions is one of the main challenges in the search for rare-element pegmatites.
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