University of Isfahan Petrological Journal 2228-5210 5 19 2014 11 22 Thermobarometry and tectonic setting interpretation of blue schist facies rocks from the Asalem metamorphic complex (NW Rasht) Thermobarometry and tectonic setting interpretation of blue schist facies rocks from the Asalem metamorphic complex (NW Rasht) 139 154 16179 FA Abbas Asiabanha Rezaei قزوین-دانشگاه بین المللی امام خمینی-دانشکده علوم پایه-گروه زمین شناسی 0000-0002-4652-960X Mohsen Nasrabady گروه زمین شناسی دانشگده علوم پایه دانشگاه بین المللی امام خمینی Saadat Mohammad Department of Geology, Faculty of Sciences, Imam Khomeini International University, Qazvin, Iran Journal Article 2016 06 14 A metamorphic complex containing green schist, mica schist and serpentinite exposed in the Asalem area (NW Rasht). The occurrence of blue schist facies rocks in this complex are reported here for the first time. Mineralogical paragenesis of metabasitic blueschists consists of glaucophane, epidote, chlorite and phengite while there are garnet, phengite, chloritoide and feldspar in the metapelitic rocks. The metamorphic conditions of these rocks calculated by THERMOCALC software, petrogenetic grids and conventional thermobarometrs, are 7 to 12 Kb and 350 to 550 ºC for pressure and temperature, Pressure and temperature conditions of metamorphism and protolith diversity (metapelite, marble, metabasite, serpentinite) of the Asalem metamorphic complex indicate that they were created in the Pacific Ocean-type accretionary prisms (B-type blueschists). The studied metamorphic complex likely originated along the Paleotethys suture zone, as a result of the subduction onset of the Paleotethys oceanic basin beneath the southern margin of Luarasia during Carboniferous. A metamorphic complex containing green schist, mica schist and serpentinite exposed in the Asalem area (NW Rasht). The occurrence of blue schist facies rocks in this complex are reported here for the first time. Mineralogical paragenesis of metabasitic blueschists consists of glaucophane, epidote, chlorite and phengite while there are garnet, phengite, chloritoide and feldspar in the metapelitic rocks. The metamorphic conditions of these rocks calculated by THERMOCALC software, petrogenetic grids and conventional thermobarometrs, are 7 to 12 Kb and 350 to 550 ºC for pressure and temperature, Pressure and temperature conditions of metamorphism and protolith diversity (metapelite, marble, metabasite, serpentinite) of the Asalem metamorphic complex indicate that they were created in the Pacific Ocean-type accretionary prisms (B-type blueschists). The studied metamorphic complex likely originated along the Paleotethys suture zone, as a result of the subduction onset of the Paleotethys oceanic basin beneath the southern margin of Luarasia during Carboniferous. https://ijp.ui.ac.ir/article_16179_e1c2676f981a4e640ade72c0078893f8.pdf