I am trying to find references that can give me an idea of what diagrams of trace elements to use in order to evaluate the possible source of the granites I am currently studying.
Hi Rafael, Best reference is a text book by Hugh Rollinson on Geochemistry - you will find all the plots for different systems. You start with this and move on to other references.
what is your granite type? S or I or A?you have any isotope data? Have you ever used GCDkit software? you can download it free and with it and related article, base of your granite type, you can determine your granite source, for example you can see this attach file with refrence::
-Samiee S., Karimpour M.H., Ghaderi M., HeidarianShahri M.H., Klöetzli U., Santos J., 2016. Petrogenesis of Subvolcanic rocks from the Khunik Prospecting Area, South of Birjand, Iran: Geochemical, Sr-Nd Isotopic and U-Pb Zircon Constraints. Journal of Asian Earth Sciences, 115(15): 170–182.
The attached article by Thompson and others (1984) is a good place to start. It has helped me distinguish between igneous rocks generated in different tectonic settings. Rocks from different settings have distinctive spidergram patterns for a full suite of chondrite-normalized incompatible (and relatively immobile) trace elements. I think this is much better than discrimination diagrams based on only a few selected elements.
We have recently published a book dealing with numerical modelling of igneous petrogenesis. It also includes chapters on practical aspects you are asking about - so it perhaps could give you a head start::
Janoušek, V., Moyen, J. F., Martin, H., Erban, V. & Farrow, C. M. (2016). Geochemical Modelling of Igneous Processes – Principles and Recipes in R Language. Bringing the Power of R to a Geochemical Community. Springer-Verlag, Berlin, Heidelberg, 346 pp. doi:10.1007/978-3-662-46792-3
It also deals with the GCDkit system, mentioned by R. Ahmadirouhani above.
... and, courtesy of the publisher, the Appendices - explaining the R syntax and the workings of the GCDkit system - are freely available at the below link ;-)