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Petrogenesis and tectonic setting of Shakha Rash granitoid, Bulfat intrusive complex, northeastern Iraq

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The Shakha Rash granitoid occurs in the middle of Bulfat igneous complex, which is an integral part of the Zagros suture zone (ZSZ), Kurdistan region of NE Iraq. Granitoid rocks are diorite, syenite, monzonite, tonalite, granodiorite, and granite which are the main variants that crop out in the area and are exposed as massive and dike. These massive rocks have different textures, equigranular with deformation, but dykes show porphyritic texture and no deformation which represents two stages of injection. The granitoids are compositionally similar to I and S-type granitoid rocks that originated from continental arcs. Their enrichment in the LREE relative to HREE is high (LaN/YbN) (35.66–266.07, ave. ~ 116.76 × chondrite) reflecting positive steep fractionated patterns probably due to the occurrence of a considerable amount of felsic minerals, with positive Eu anomalies suggested cumulus plagioclase. This feature together with a relative depletion of elements Nb, Pr, Nd, Zr, Hf, and Ti but Cs, Rb, Ba, K, U, and LREE enrichment confirms the derivation of granitoids from a crustal source region in a continental arc environment. Based on trace element discrimination and Th/Yb vs. Ta/Yb ratios, granitoid rocks are formed at the active continental margin.

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Correspondence to Mohammed M. Zrary.

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Responsible Editor: Domenico M. Doronzo

The original online version of this article was revised: Figure 12 is a duplicate of Fig. 5; the correct figure should have appeared as shown below.

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Zrary, M.M., Aqrawi, A.M. & Elias, E.M. Petrogenesis and tectonic setting of Shakha Rash granitoid, Bulfat intrusive complex, northeastern Iraq. Arab J Geosci 15, 1375 (2022).

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