Analysis of Exhumation History with Using Low Temperature Thermochronometers: Misho Mountains, NW Iran

Misho Complex in NW Iran has a remarkable unique high topography surrounded by well known faults, Precambrian basement rocks were uplifted and exposed. Structural data indicate that the exhumation of the Misho Complex was result of displacements along the North Misho, South Misho and Tasouj faults. Study of structural and thermochronometery and combination of their results show that uplift initiation time was not unique in this Complex. Analysis of 10 AFT samples clear that the western Misho Complex has the high amount of uplifting during early Palaeocene (72.7 10.6) mid Miocene (50.3-3.4) time. But uplifting in central and eastern parts of the Misho Complex was starting later in mid-Miocene (22.5 3.4). Difference in uplifting time in various parts of Misho Complex resulted in variety of basement uplifting and exhumation in different parts of the Misho Mountains. Interpretation of minimum and maximum topography homogenised samples shows that the rate of uplifting was more than that in the western part of the Misho Complex. It is concluded that, displacements variations along the surrounded faults and rotation of existing blocks resulted in variation of the uplifting and exhumation amount in the area.