A-type granites generally have high Nb, Ta, Y, Ga/Al, TiO2/MgO and FeOt/MgO values with low CaO, Al2O3, MgO, Sr and Eu/Eu* values. However, when melting occurs at a greater pressure (P ≥ 8 kbar), clinopyroxene predominates in the residue, resulting in the loss of the majority of the chemical characteristics of A-type granites. Also, Spinel fractionation may result in a lower Ga/Al ratio. Aside from the aforementioned two possibilities, what could account for the relatively low values of Zr+Nb+Ce+Y and Ga/Al in A-type granites?
Dear Sujay Nandi .
Two things are important:
The A-type granites from whar formed, where and what condition.
and what is the geochemical behavior of the elements you mentioned.
Read this article of mine, it has a novel geochemical suggestion:
Article Fizikailag-metafizikailag bizonyítható a graviton létezése
If you understand and the idea described is good, you can benefit greatly from this article
Regards,
Laszlo
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