Iranian ophiolites are part of the Tethyan ophiolite belt of the Middle East. They join the Middle Eastern and Mediterranean Hellenides-Dinarides ophiolites (such as Turkish, Troodos, Greek and East European) to more easterly Asian ophiolites (such as Pakistani and Tibetan) [33] . The Neyriz ophiolite, found in a semi-arid environment along the Zargos thrust Zone, SW Iran, is a well-preserved part of the Tethyan oceanic lithosphere [39] . Neyriz ophiolite complex; is located in the north of the Neyriz city; it limits to the eastern Sanandaj-Sirjan zone, and the Bakhtegan Lake to west and the Zagros thrust to south. As structural division, studied area is a part of the high Zagros or crushed zone. An important feature of Zagros crushed zone is severity of deformation and also exposed ophiolite sequence. In the scope of the subject of this study (Dowlat Abad-Tang e Hana) (Figure 2), a series of Neyriz ophiolites observed; Three main ophiolite sections can be seen in this row: frequency of dunite and harzburgite and little chromite which forms the base of this Periodicity. Periodicity of webstrite, lherzolite, clinopyroxenite, olivine-webstrite and a little bit chromite in the middle part of the sequence, and in some articles referred to as the transition region. Section of gabbro is composed of and feldspar-bearing peridotites, from melagabro and norite gabbro, troctolite and anorthosite, respectively in the bottom part and in the middle section ferrogabbros, locogabros and finally in the end is composed of quartz and quartzdiorite and ferodiorite [40] - [43] .

To evaluate the Eastern range part of Neyriz ophiolite complex (Dowlat Abad-Tang e Hana), after field surveying, the 84 samples selected from host rocks, trenches and wells logs. Thin sections of different rock-types were studied, achieving more information about the petrographic characteristics of the Dowlat Abad-Tang e Hana area. The sections gathered from harzburgite, dunite, chromitite, pyroxenite rock-types. Whole rock major elements of ultramafics and trace elements were determined by X-ray fluorescence (XRF) spectrometer. Also, these samples were analyzed by ICP-OES for REE and minor elements. The measurement results are presented in Table 1 and Table 2.

The main host rocks, according to their composition divided into several groups: peridotite, pyroxenite, gabbro, diabase dikes, basaltic rocks, radiolarites, serpentinite [44] , small masses of metamorphic rocks, lumps of chromite and magnetite veinlets. The most extensive rocks in Neyriz ophiolite are dunite, harzburgite, pyroxenite, little lherzolite and with norite, gabbro, serpentinite and chromitites often with dunite host rocks and some harzburgite host rocks [45] . Serpentinite alteration of peridotite rocks with varying degrees (10% to 90% serpentine) has been made. The most abundant rock in the ophiolite complex of Dowlat Abad-Tang e Hana region is harzburgite [46] . Based on abundance of pyroxene, rocks can be divided into two main groups wich are harzburgite (homogeneous) and depleted harzburgite. Harzburgites composed of olivine (55% - 75%), orthopyroxene (30% - 35%), clinopyroxene (3% - 5%) and chrome-bearing spinel (3% - 5%). Depleted harzburgite also contain olivine (60% - 80%), orthopyroxene (15% - 20%), clinopyroxene (1% - 3%) and chrome-bearing spinel (less than 2%). It is believed that harzburgite is the result of increasing in degrees of partial melting in the upper mantle and by evolution of rock lherzolite is formed [47] . In the course of the deep zones to the upper part of ophiolite column, depleted harzburgite the rocks and metamorphic foliation intensity increased and the mineral alteration in the rocks decreases (Figure 3). In this rocks, spinel often forms amorphous to hypidiomorphic and can be seen both the crystalline and the inclusion in olivine crystals (Figure 4 and Figure 5).