نوع مقاله : مقاله پژوهشی
نویسنده
دانشیار دانشگاه ارومیه
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
The serpentines are one of the members of the Gysian Silvana ophiolites at the South of Urmia (near Iran’s border with Turkey and Iraq) in the continuation of Neo-Tethys Suture zone at the NW of Iran. These rocks are composed of lizardite/chrysotile and magnetite as the major phases and spinel, olivine and pyroxenes as the minor minerals with green appearance and soap touch. Various microstructures such as mesh, poikilitic, fibrous, augen, and hourglass, were identified in them. Based on the whole rock geochemistry and using diagrams and ratios between major oxide and trace elements, these rocks belong to subducted serpentinites groups. Refertilization of these rocks due to the rock/fluid interactions at subduction channel, with strong enrichment in fluid mobile elements (FMEs) such as Sr, Li, Ba, As, U, and Pb were confirmed, too. Because of the absence of antigorite in them, it is possible that the depth of the oceanic slab subduction was less than 50 km since the high angle of slab at this part of Iran
کلیدواژهها [English]
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