مطالعه سنگهاي آتشفشاني زير دريايي منطقه حيران(شمال شرق اردبيل)

Study of submarine volcanic rocks in the Hayran area (north-east of Ardabil)

The area under study is situated in north-east of Ardabil and between Ardabil and Astara. Petrologic and structural evidences indicate the submarine volcanic activities in this area. The area rocks show basaltic composition. Pillow lavas, dykes , prisms and lava lakes in different points indicate oceanic crust residue in the area. Locality studies of other points in the Alborz such as Chalus, Lahijan and Amlash and structural similarity with Hayran area explain that Hayran area may be south Khazar spreading line trail. Stratigraphical evidence and resting of basaltic lavas below Fajan formation conglomerate indicate that Hayran area submarine rocks like other locations of Alborz are formed in Cretaceous.