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The Doran Granite is situated at 12 Km south of Zanjan. It is overlain nonconformably by the Bayandor Formation. The presence of some phyllitic and shaly enclaves of the Kahar Fm. within Doran granite indicates that the latter has been injected into the former. The existance of cordierite hornfels and biotite hornfels at the boundary with Kahar Formation is probably related to the great volume :f this granite at depth. The granite, in the outcrop, is white, devoid of ferromagnesian minerals, and contains some kind of pink granite intrusions.
Formerly, the Shah-Bolaghi, Sarve-e-Jahan, and south Mahabad intrusions, were considered to be of Doran granite type, and Mahabad arid Sain-Dej’s rhyolites are extrusions of the same granite. However, the results of the present investigation indicate that the Sarv-e-Jahan and Shah Bolaghi intrusions themselves are two distinct types of granite. Among these two, only the white and devoid of ferrornagnesian type is of Doran type and has genetic relations with it.
From the viewpoint of tectonic setting all these mentioned granites intrusions could be attributed to anorogenic A-type granites group, that is re1atd to an extent ional phase which has probably taken place at infracambrian time.
The south Mahabad intrusion is granodiorite and is not genetically related to Doran granite.
By comparing the Mahabad and East Sain-Dej rhyolites with Doran granite it appears that, although they might be formed under similar conditions, but they are not originated from the same source.