TY - JOUR ID - TI - Gabbroic Rocks in Mawat Ophiolite Complex, NE Iraq: Geochemical Constraints on their Tectonogenesis AU - Mohammed A. Al-Jboury AU - Omar S. Al-Taweel PY - 2022 VL - 63 IS - 12 SP - 5368 EP - 5385 JO - Iraqi Journal of Science المجلة العراقية للعلوم SN - 00672904 23121637 AB - The Mawat Ophiolite Complex located in north-eastern Iraq represents part of theIraqi Zagros Suture Zone, located at the border between the Arabian-Iranian plates.It consists of peridotite, gabbro, subvolcanic sheeted dykes and volcanic pillow lava.The geochemical signatures of the gabbro show a significant variation in majorelements concentration, low concentrations of TiO2 (0.06-0.36 wt.%), Na2O (0.44-0.98 wt.%), K2O (0.024-0.48 wt.%), P2O5 (0.002-0.009 wt.%) and moderatevariations in SiO2 (46.13-53.77 wt.%) with wide ranges and high concentration ofAl2O3 (13.87-22.18 wt.%), Fe2O3 (0.04-2.95 wt.%), FeO (2.68-8.76 wt.%), MgO(8.09-14.28 wt.%) and CaO (11.08-17.04 wt.%). The flat REE patterns of thepresent rocks represent island arc tholeiite (IAT) tectonics and a subduction-relatedenvironment. The main features of the magma generated in the supra subductionzone are the enrichment of LILEs and depletion of the HFSEs and the strongnegative Nb anomaly. Geochemical evidence indicates that the tholeiitic gabbroswere generated in an arc-related tectonic setting. The tectonomagmatic diagrams forgabbros and the very low Ti content propose that the gabbroic rocks of MawatOphiolite have island arc tholeiitic (IAT) and possibly boninitic affinities whichhave a related to the supra-subduction zone (SSZ).

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