Iraqi National Journal of Earth Sciences

Abstract

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.