Potassic granitoids from Kal-e Kafi volcano-plutonic complex (NE Anarak) and their modes of formation

Category Petrology
Group GSI.IR
Location 23th symposium on geosciences
Holding Date 05 May 2008

      A few of the granitic rocks found in Kal-e Kafi volcano-plutonic complex are strongly K-rich and show characteristic geochemical and petrographic features. Major and trace element geochemistry of these potassic granitoids demonstrate two distinct compositions. Three samples with higher silica, follow the geochemical variation trends shown by other granitic rocks of the complex. These three samples are produced through fractional crystallization. The other potassic granitoid sample with lower silica, contain the least amount of Ba and Sr and the highest amount of Rb, Nb and Ta. The melt that produced this sample is more likely to be the product of crustal partial melting.