This paper is a review on the Tertiary magmatism in the 1:100,000 . sheet of Jirandeh.The study region has been covered with Eocene volcanic rocks that contain andcsy-basalt,andesite,Traky andesite,dacite-andesite lavas and acidic to intermediate pyroclastic rocks as litic-crystal tuff.
Tertiary rocks have intruded by Gabbroic and Granodiritic plutons.They are high K calk-alkaline rocks.
Geochemical results show that volcanic activities have done on the active continental margin.Granitic masses are I-type and are CAG Granites.
Gabbroic masses are related to the continental active margin environment.