Petrological study of plutonic rocks of leghlan areas, East of Horand,NW of Iran
Plutonic rocks of the area located in the north-west of Iran, and it is belong to part of activity zone of Alborz-Azarbaijan zone. Their age is oligonce and intruded into sedimentries of Eocene age . The rocks of the area are syono-gabbro,syeno-diorite and monzodiorite .Field and petrographical evidences(texture and minoralogy)shows that the transitional magma for these rocks. In this case textures like acicular like apatite, mesh structure,etc can be causes for the magma mixing of acid and basic magma.
According to geochemical investigatin and diagrams, the rocks of the area are high K alkalines series and formed in Island arc and active continental Margin. The tectonic environment for the rocks of the study area is post collission.