Cimmerian metamorphism and post Mid-Cimmerian exhumation in Central Iran: Insights from in-situ Rb/Sr and U/Pb dating

The pre-Alpine evolution of the Tethyan domains between Gondwana and Laurasia, in particular that Cimmerian continental blocks, remains poorly constrained. Central Iran is a key area to constrain closure Paleotethys collision Laurasia with blocks drifted from Gondwana. present study provides combined metamorphic geochronologic approach focused on two areas Iran: Kashmar-Kerman Tectonic Zone (KKTZ) Jandaq area, whose tectonometamorphic units are affected low- middle-pressure high-temperature metamorphism. We performed in-situ texturally constrained U/Pb dating titanite Rb/Sr mica quantify timing intensity burial exhumation these rocks. Results show metamorphism central eastern KKTZ (7–9 kbar; ?700 °C) synchronous or slightly postdates orogeny (?190-180 Ma) relates following closure, whereas complex (12–13 ?450 subduction. Based paleogeographic reconstructions, lied hundreds kilometers south suture zone. As such, we propose along results shortening rheologically weak domain located outboard main suture. In-situ biotite yields precise accurate cooling ages (±2-5 ranging 170 140 Ma. These document terranes Mid-Cimmerian event onward (?170 Ma), coeval widespread extension distributed across thought reflect upper plate above Neotethyan subduction system.