Deep Conductivity Structure of the North Anatolian Fault Zone and the Istanbul and Sakarya Zones Along the Gölpazari-Akcaova Profile, Northwest Anatolia
- 1 August 1996
- journal article
- research article
- Published by Taylor & Francis in International Geology Review
- Vol. 38 (8), 727-736
- https://doi.org/10.1080/00206819709465356
Abstract
Magnetotelluric (MT) measurements at six locations along a 90-km profile across the area between Gölpazari and Akcaova have been modeled in two dimensions to increase understanding of the deep conductivity structure of the western part of the North Anatolian fault zone (NAFZ) and the Istanbul and Sakarya zones. It is well known from surface geology that the branch of the NAFZ that passes through the Pamukova Valley with an E-W strike separates the region into two sub-areas, containing contrasting sets of geological features. These two areas also exhibit significant differences in terms of their deep conductivity structure. Electrical resistivity is quite low (10 ohmm) south of the fault at an approximate depth of 26 km, compared to the area north of the fault zone. This low-resistivity zone may provide an indication of partial melting at this depth. In the northern part of the profile beneath Ücgaziler (DUC) and Akcaova (DAK), a five-layered conductivity sequence obtained by magnetotelluric modeling and the magnetotelluric model has been examined in light of the surface geology. It is concluded that layers in the conductivity model may correspond to fragments of the Istanbul zone and the Sakarya continent, as well as the ophiolitic slab in between.Keywords
This publication has 8 references indexed in Scilit:
- High-resolution seismic profiling in the Sea of Marmara (northwest Turkey): Late Quaternary sedimentation and sea-level changesGSA Bulletin, 1995
- Geological evolution of the late Mesozoic continental margin of Northwestern AnatoliaTectonophysics, 1995
- Active tectonics of the north and central Aegean SeaGeophysical Journal International, 1991
- Strike‐slip fault geometry in Turkey and its influence on earthquake activityTectonics, 1988
- Rates of crustal deformation in western Turkey as deduced from major earthquakesTectonophysics, 1988
- Active tectonics of the Alpine--Himalayan Belt between western Turkey and PakistanGeophysical Journal International, 1984
- Tethyan evolution of Turkey: A plate tectonic approachTectonophysics, 1981
- Computer determinations for the fault-plane solutions in and near AnatoliaTectonophysics, 1967