Geochemistry, mineralogy and petrogenesis of Rudan Ultramafics North (Groom mountain), Hormozgan province

The studied area is located in the north of Rudan city, Groom mountain, in the contact area of the Zagros and Makran zones and some part of Kahnuj-Rudan-Minab ophiolite belt. The studied ultramafic rocks include lherzolite and harzburgite, matrix minerals contains olivine, orthopyroxene, clinopyroxene and chromian spinel which is a minor mineral. Based on the geochemical data, the amount of CaO, MgO, TiO2 and V, these rocks belong to non serpentinized orogenic ophiolites. According to microprobe data, the high amounts of Mg#(91.15-93.24) in the lherzolite olivines are indicated that these olivines had refractory and restite, also lherzolite clinopyroxenes are also of the diopside quality, but spinels have poor chromian. Detailed microprobe studies on the spinel of these rocks, ndicated of the high amounts of Mg#(71-77) and Al2O3(52.98 to 46.31Wt%) ) and low Cr#(14-22). Cr/Al proporation of in chromian spinels of lherzolites are equal to 0.19 and amount of Fe3+ in the lherzolite spinels is very low (