Petrography and Petrology Of Volcanic Rock from KAVANDA.J (25Km Fast Qazvin)
The under study regien is Located At 25 Km Of east Qzvien on
The way Of TEHRAN — QAZVIN high way. The rock under persent study belong to Tertiary (karaj Formation) and are Of Basalt, Andesite, Tracy Andesite and Rhyolite type. petrographic and Petrologic invistigation revreal that thes rocks possess Alkalan to sub—alkalan (Calc-Alkalin)characteristic.
It is most probable that the magma from which basic to inter midiate rock crystalliziation was an Alkalin magma that Originated
Frome mantel rocks whereas the magma frorm which Acidid Rocks (rhyolites) crystallized was product by partial meltiny of solid
crustal material. Maymatic evolution has coused the deviation of alkalin magma characteristics towards those of sub-alka line.