Two Contrasting Exhumation Scenarios of Deeply Subducted Continental Crust in North Pakistan

In Western Himalayan Syntaxis, the India-Asia continental collision occurred at ca. 50 Ma, while its uplift history and exhumation mechanism are still in dispute despite decades of studies. A new type eclogite was found Naran, located 30 km southwest Upper Kaghan Valley. Phase equilibrium calculations thermobarometer performed on Naran documented peak-P metamorphic condition 720–780°C 2.4–2.8 GPa. Two further stages were identified with first one high-P granulite-facies conditions 750–800°C 1.6–1.9 GPa, second amphibolite-facies 550–630°C 0.5–0.8 SIMS U-Pb dating zircons yielded an age 46 ± 2 which is interpreted to constrain metamorphism along northwestern margin Indian plate. rutile a cooling 26 3 as amphibolite facies. The average speculated rate massif (∼3 mm a−1) much lower than that recovered from Valley (86–143 a−1). tectonic evolution whole Syntaxis shows difference temporal spatial change within Paleogene era, indicating inconsistent histories slices. Such multi-slice process probably related closure Neo-Tethys ocean break-off lithospheric slab.