The Father pluton is part of the Northern Volcanic Zone of the Archean Abitibi Subprovince and is located 100 km east of Lebel-sur-Quévillon and 105 km southwest of Chibougamau. It represents one of the large granitoid masses that characterize the Abitibi Subprovince. The pluton has an elongated SW-trending form, and is composed of several faciès from tonalité to granodiorite. It is bordered to the north and to the south by two major E-W structures, the Doda and Hébert faults respectively. Two other faults (Cl and C2) are localized within the pluton in its SW part. These major faults are interpreted to have played a major role in magma transport and in the emplacement of the pluton.The Father pluton includes several faciès of differing chemistry. These faciès are calcoalkaline, meta-aluminous to peraluminous and results of this study suggest they are linked by a process of fractional crystallization. Mineral phases implicated in the fractionation are: hornblende, biotite, oligoclase, apatite and allanite. Rare earth element patterns of the pluton show an enrichment of light rare-earths (LREE) compared to heavy rare-earths (HREE). An enrichment of Ta observed in the granodiorite, is probably linked partly to the accumulation of magnetite as well as titanite in this faciès (Ta= 2 to 5 ppm in the rocks). The abundance of titanite and magnetite (Ta= 2 to 4 ppm) is correlated with the abundance of Ta in the granodiorite phase.The structural analysis of XZ sections (perpendicular to the foliation and parallel to the lineation) shows two distinct mineral orientations. The first direction constitutes the dominant orientation and corresponds to the shear plane (C). This orientation was acquired at the onset and persisted to the end of magmatic flow, as suggested by the parallel orientation of both the quartz and the ferromagnesien minerals. The second orientation, represented by large grains of potash feldspar and some isolated grains of biotite and/or hornblende, probably represents the S plane. This second orientation testifies to the combined effect of preferential orientation (oriented growth) of these minerals and the shingle-like orientation resulting from the latest regional tectonic event.Two sets of foliation are recognized in the Father pluton. The principal foliation, occurring over almost all the pluton, is oriented SW, parallel to the length of the pluton. The second, NW-oriented set is well developed in the SW part of the pluton. The predominant SW-trending foliation corresponds to the magmatic state during the emplacement of the faciès in which it developed. Three hypotheses are postulated for the origin of the NW-trending foliation, it may be the result of: 1) the influence of the pluton contact with the adjacent tonalité; 2) a fabric produced by the NW shearing observed in this sector; or, 3) a vestige of an early flow overprinted by the shear zone Cl.The proposed model for the Father pluton is emplacement in a pull-apart zone. The play of the Doda and Hébert faults was responsible for the format...