petrology of ultramafic and related rocks along iraqi zagros thrust zone

y the East Anatolian left-lateral strike slip fault and to the southeast by
the Oman line. The orogen consists of three parallel belts (Fig. 2-6): (1) the
Urumieh-Dokhtor Magmatic Assembalage (UDMA), which forms a distinct
linear intrusive-extrusive complex, extends along the entire length of
Zagros orogenic belt, with width of over 4 km. The UDMA comprises
various lithologic units including gabbro, diorites, granodiorites and
granite bodies of different size. It also contains widely distributed basaltic
lava flow; (2) Zagros Imbricate Zone (ZIZ), which is a zone of thrust faults
that have transported numerous slices of metamorphoses and non
metamorphosed Phanerozoic stratigraphic unit of Arabian continental
margin, as well as ophiolites, from the collisional suture zone on the
northeast toward interior parts of the Arabian craton to the southwest.
The ZIZ comprises both Sanandaj-Sirjan Zone (SSZ) in Iran and Iraqi
Zagros Thrust Zone in Iraq; and (3) the Zagros fold-thrust belt, which
forms the less strained part of the orogen, and consists of a pile of folded
and faulted rocks composed of 4 to 7 kilometres of mainly Paleozoic and
Mesozoic successions overlain by 3 to 5 kilometres of Cenozoic sliciclastic
and carbonate rocks resting on highly metamorphosed Proterozoic Pan-
African basement that was affected by the late Neoproterozoic-Cambrian
Najd strike-slip faults (Alavi, 2004).
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