Petrogenesis of Heiran area submarine lavas in north east of Ardabil, Iran: A case study of Sevan-Akera-Qaradagh Ocean back arc basin
Heiran area is located in north-west of Ardabil and south west of Caspian Sea. Field evidences indicate
submarine volcanic activities in this area. The rocks in this area are of basaltic composition. The
outcrops of pillow lavas, prisms, dykes and lava flows in different points are evidences showing the
existence of oceanic crust in this area. Studies on other locations of southern margin of Caspian Sea
as well as structural and petrological similarities between Heiran and these areas may confirm the
fact that Heiran area is part of geo-suture of Caspian Sea southern margin. The submarine lavas in
this area are associated in age with late Cretaceous-Eocene. With regard to petrographical
characteristics, the rocks under study range from andesitic basalt to olivine basalt and belong to
alkaline series. The tectonomagmatic environment of these lavas is related to back arc basin. These
magmas originate from subcontinental lithospheric mantle and have formed in a supra subduction
environment. During upper Cretaceous-middle Paleogene, the closing of Sevan-Akera-Qaradagh
Ocean led to the formation of marginal basin in the form of a back arc basin in the margin of Caspian
Sea. The submarine lavas of Heiran area are likely to have originated from the volcanic activities of
this marginal basin.
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