Magmatic Contamination by Metapelitic Xenoliths (Schist) Fallen Down into the Tall-e-Pahlevani Batholith, Shahr-Babak, Iran

The Talle-Pahlevani anorogenic magmatism with Leuco-quartz diorite and anorthosite compositions injected into the southwest of the Qori metamorphic complex, which extends in southwest of the Sanandaj-Sirjan zone, at c. 170 Ma. As a result of this process, the metapelite host rock from the complex was metamorphosed and broken down. Fragments (xenoliths) of the host rock, which are primarily regional metamorphic kyanite schists, fell into the magma. These xenoliths underwent a high grade contact metamorphism due to H2O-free magma with high-initial temperature. The partial melting of the metapelitic xenoliths (schists) occurred because they were saturation or super-saturation in H2O, and as such, some of these xenoliths became weak, because of partial melting, and scattered throughout initial magma of the batholith, and contaminated it due to convective flows in the batolith.