Abstract:
The granitic rocks in Kumrat Valley, Upper Dir, Khyber Pakhtunkhwa, Pakistan are
studied in terms of their petrographic and geochemical characteristics. Field relationship and
petrographic studies display coarse-grained to porphyritic texture and classify it as a twomica granite. Alkali feldspar, quartz, plagioclase and biotite make the essential minerals
whereas muscovite apatite, zircon, titanite and chlorite are the accessory contributors. The
modal mineralogy and colour index plots depict calc-alkaline and leucocratic character of
the studied rocks. The Harker plots of major element reveal early fractionation of feldspars
and biotite from the system. The CaO/(FeO+MgO+TiO2) versus CaO+FeO+MgO+TiO2 and
Al2O3/TiO2 versus CaO/Na2O plots show per-aluminous nature and pelitic to psamtic source
for this granite. The tectonic discrimination plots predict collisional island arc type of
tectonic environment during the formation and emplacement of Kumrat granite.
