Abstract

Major and trace elements geochemistry of Koji granites were determined to deduce the petrogenesis of the rocks. Six granite rock samples were collected and analyzed for their major and trace elements using the Inductively Coupled Plasma Mass Spectrometer Methods. From the major element geochemistry, SiO2 ranges from 69.34%-72.97% and hence suggests a felsic granite. The strong correlation between SiO2 and CaO, MgO, Na2O and Fe2O3, suggest that the primary mineral assemblage may have undergone significant changes during fractionation. The high K2O content suggests the abundance of K-feldspar in the rock. From the trace element geochemistry, the High Field Strength Elements (HFSE) and the Large Ion Lithophile Elements (LILE) is consistent with values of the average granite and crust. The depletion of Sr suggests plagioclase fractionation. The plot of A/CNK against SiO2 indicates a S-type granitoid and on the basis of alumina saturation, it suggests a peraluminous granite. Based on the A/CNK against SiO2 plot and alumina saturation plot the geotectonic setting indicate volcanic arc syn-collisional granites.

Keywords:

Fractionation, peraluminous, syn-collisional granites, volcanic arc,

References

Competing interests

The authors have no competing interests.

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