الملخص

This study concentrates on two serpentinite bodies (Mawat and Penjwin) within Zagros Thrust Zone, North East Iraq. The Mawat Serpentinite which represents lherzolite protolith show δ18O of 6.77 – 8.33 %o and δD values of (-65) - (-61) %o. The Penjwin serpentinite (harzburgite protolith) show δ18O values of 10.90 – 13.29 %o and δD values of (-74) – (-69) %o. Mawat serpentinization occurred by hydration of mantle wedge rocks along intraoceanic supra-subduction zone at temperature of 150 – 200 oC. On the other hand Penjwin serpentinization occurred during and after emplacement of Penjwin ophiolite suite at temperature of 50 – 100 oC. Emplacement of Mawat serpentinite as an isolated body into Walash volcano-sedimentary sequence took place by diapiric process. Penjwin serpentinite was emplaced due to tectono-metamorphic event.