It is tectonically influenced by the Arabian Plate subducting beneath the Eurasian Plate, forming the Chagai volcanic zone. Tectonic activity related to this subduction is ongoing. Before the onset of volcanic activity at Koh-i-Sultan in the early Quaternary, tectonic uplift occurred in the region. Koh-i-Sultan and the Iranian volcanoes Bazman and Taftan form the Sultan volcanic arc. Also known as the Makran or Baluchistan volcanic arc, it is c. long and stretches in an east-northeast direction. Magma generated by the relatively shallow subduction of the Indian Plate rises to the surface and forms the andesitic rocks, among others, of Taftan and Koh-i-Sultan. The related Makran subduction zone is one of the few Cretaceous zones still active, and has formed a large accretionary prism.