Research Information System
23. Electromagnetic Induction Workshop, Chiang Mai, Thailand, 14 - 20 August 2016, vol.1, no.1, pp.329, (Full Text)
The Isparta Angle is an inverse-triangle region bordered by the Aksehir Fault Zone (AFZ) and the Fethiye Burdur Fault Zone (FBFZ) in the east and west respectively. The region is located in the southwestern Anatolia where a tearing and rising of asthenosphere occurs between the Hellenic and Cyprus arcs. It is an obstacle to the rising and S-SW moving central Anatolia plate as well as a transition zone between the expanding west Anatolia and the central Anatolia. Magnetotelluric method is sensitive to the resistivity variations beneath the Earth and employed frequently to reveal the tectonic structures of the region from shallow crust to the deep mantle. In this research, 47 magnetotelluric data were acquired along 4 profiles, two of which cross the FBFZ and the rest cross the AFZ. The geo-electric structure of the region was revealed by both 2D and 3D analysis. The prominent result of this study is that the electrical structure beneath the first profile, which crosses FBFZ in the west, differs from the rest of the modeled area according to conductivity values and distribution of these anomalies in the western and eastern regions. In the west there is a lower crustal conductor (1-10 ? m ), which is located S-SW of the Isparta Angle and could be related to partial melting. Furthermore, there is a shallow conductor zone, which becomes shallower in fault regions in upper crust toward the northwestern FBFZ and could be an indication of fluids in fracture zones. On the other hand, toward the east of the region the lower crustal conductor becomes deeper and less conductive. The basement geological units are imaged as ∼1000 ? m resistive zones. Sultandagi methamorphics and AFZ are also imaged in the electrical resistivity models. Consequently, a conductive zone imaged at upper crustal level in the west of the FBFZ but not imaged in the east may imply that the FBFZ and its surroundings could be a border between the rising and moving central Anatolia’s thick crust and the expanding west Anatolia’s thin crust.