Volcanic rocks in the field are dominated by andesite, with subordinate basalt, dacite and rhyodacite.
[4] To a more recent phase of volcanism belong andesitic centres, some of which lie on river terraces and form easily recognizable coulees.
Andesites form the bulk of the products with subordinate dacites,[2] as well as some rhyodacites which are found in the eastern part of the field, where the explosive activity took place.
Elemental composition is typical for island arc volcanoes, although strontium content is rather high.
[7] The basement of the area is formed by even older (Oligocene-Eocene) volcanic rocks that contains intrusions of granodiorite.
[9] Volcanic activity commenced 12 million years ago and continued until historical times, according to unpublished data by G.
[8] Tectonically, the field is located between the Makran mountains in the south, a range formed by Paleocene flysch and older ophiolites, and the Lut block in the north which is a crustal block of Paleozoic-Mesozoic age that is buried beneath more recent sedimentary and volcanic rocks.
[14] The field is in the Central Iranian volcanic belt, a mountain range with summits exceeding 4,000 metres (13,000 ft) of altitude.