oxygen and hydrogen isotope study of serpentinized peridotite rocks, thrust zone, north east iraq

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 18O of 6.77 8.33 %o and D values of (-65) - (-61) %o. The Penjwin
serpentinite (harzburgite protolith) show 18O values of 10.90 13.29 %o and D 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.