Imad Kadhim Abdulzahra 1, 3 Ayten Hadi1, Hossein Azizi 2
1 Geology Department, College of Science, University of Baghdad,
2 University of Kurdistan, Iran
3 Iraq Geological Survey
The north and northeast Iraq are considered as a part of Zagros Orogenic Belt (ZOB) which extends from southeast Turkey through northeast Iraq, northwest Iran to northern Oman. This zone was formed within the Neo-Tethys Ocean and thrusted over the Arabian Plate in the Late Cretaceous obduction followed by collision during the Miocen-Pliocene time. Several types of granitoids intrusive bodies, including I- and A- type granites are distributed in the Shalair Valley area. Structurally, Shalair Valley area is located within so-called Iraqi Zagros Suture Zone in the extreme northeastern part of Iraq representing the highest thrust sheet in Iraq and is considered as an integral part of Sanandaj-Sirjan Zone (SaSZ) of Iran. Jurassic and Cretaceous granitic plutons are widely distributed in the SaSZ of the ZOB whereas the Paleozoic granitoid rocks are less distributed there. However, the petrogenesis and ages of the plutons are less certain. The understanding of igneous activity in the Shalair Valley area, the northern edge of the SaSZ, is one of the key elements for reconstruction of tectonics in the ZOB. In this study, we report radiometric ages and chemical and Sr-Nd isotopic features of the granitiods in the Shalair Valley area.