151 / 2015-06-28 00:41:32

Geology and geochemistry of the Sangan magmatic rocks, NE Iran

granitoids,volcanic rocks,Sangan,Neo-Tethys,Iran

Sangan magmatic rocks outcrop ~40 km along Doruneh fault (NE Iran) and consist of syenogranite, granite as well as trachydacite, dacite and trachyte. Granitoids intruded Middle Eocene high-K volcanic rocks. They are metaluminous to peraluminous, calc-alkaline and I-type in composition. Their chondrite-normalized REE patterns are characterized by LREE enrichment and show slight negative Eu anomalies. Sangan magmatic rocks are products of crustal assimilation by mantle melts associated with extension above the subducting Neotethyan Ocean slab beneath SW Eurasia. Similar subduction-related extension was responsible for the flare-up of Eocene–Oligocene magmatism across Iran, associated with core complex formation in central Iran.