The Deep Resistivity Structure of Southwestern Turkey: Tectonic Implications

Gürer, Ömer Feyzi; Bayrak, Murat; Ilkişik, O. Metin

doi:10.2747/0020-6814.46.7.655

Cited by 13 publications

(8 citation statements)

References 17 publications

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“…The shallow CPD field in the WAEP of the study area (SCPD1) is characterized by a thinner upper crust and a highly conductive lower crust (10 m) beneath. The top boundary of the conductive lower crust is rather shallow in this area (Gürer et al, 2001(Gürer et al, , 2004). The resistivity model of northeast Japan by MT data sets shows conductive zones under a geothermal field, where the CPD are shallow (Ogawa, 1992;Ogawa et al, 2001).…”

Section: Discussionmentioning

confidence: 90%

“…d) Taurides The deep CPD (DCPD2) estimates in southern part of the study area clearly coincide with the Taurus Mountains. From inversion of the MT data of a NW-SE profile in SW Anatolia under the Taurus Mountains, a very highly resistive (>2000 m) thicker upper crust is observed while the lower crust is much thinner (Gürer et al, 2004). The deep CPD estimates between 15 and 20 km (contrary to low heat-flows at block numbers 52, 53, 62, 63, 72 in Fig.…”

Section: Discussionmentioning

confidence: 94%

“…The resistivity model for a NW-SE profile from magnetotelluric (MT) data in SW Anatolia provided invaluable insight concerning the variation in depth of the transition from resistive upper crust to conductive lower crust (Gürer et al, 2004). The southern part is characterized by a thick (40-50 km) resistive (>2000 m) upper crust and thin conductive lower crust.…”

Section: Previous Geophysical Studiesmentioning

confidence: 99%

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Curie Point Depth variations to infer thermal structure of the crust at the African-Eurasian convergence zone, SW Turkey

et al. 2005

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We examined the thermal structure of the crust across complex deformation zones in SW Turkey using the Curie Point Depth (CPD) estimates and made comparisons of the thermal state of the crust with the seismic activity to provide insights for spatial limits of brittle failure in this region. The CPD estimates of SW Turkey from 80 overlapping blocks vary from 9 to 20 km. SW Turkey has two regions of shallow CPD. The shallow CPD region in the Uşak-Afyon zone in western part of the study area is caused by upper crustal thinning and shallowing of high conductivity lower crust. The other shallow CPD region is in the Central Anatolian Volcanic Province in the eastern part of the study area and is thought to be related to the presence of silicate melts in the shallow-level crust. A NNW-SSE trending belt of deep CPD region separates these two zones and is located along the boundary of high (west) and low (east) seismic activities. It is interpreted that the regional thermal structure in SW Turkey is mainly controlled by the processes associated with the African-Eurasian plate convergence zone. The N-S lithospheric extension above the subducting slab created a thermal dome in Western Anatolia in response to upwelling of asthenosphere. Post-collisional magmatism of Neogene-Quaternary age generated another thermal dome in the eastern area. Comparison of the CPD variations with the seismic activity has shown that large earthquakes occur near the margins of the inferred regional thermal domes. Low seismic activity within the regionally active seismic areas seems to be associated with shallow CPD and high heat flow.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 94%

Section: Previous Geophysical Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Curie Point Depth variations to infer thermal structure of the crust at the African-Eurasian convergence zone, SW Turkey

et al. 2005

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“…From inversion of the magnetotelluric data of a NW-SE profile in SW Anatolia under the Taurus Mountains, a very highly resistive (>2000 m) thicker (approx. 40 km) upper crust is observed, while the lower crust is much thinner (Gurer et al, 2004).…”

Section: Regional Tectonic Settingmentioning

confidence: 90%

“…The thickness of the crust was also found to be approximately 36 km based on Bouguer gravity data from southern Turkey (Riad et al, 1981). Inversion of the magnetotelluric data across the Taurides of SW Anatolia provided an invaluable insight into the variations in depth of the transition from resistive upper crust to conductive lower crust (Gurer et al, 2004). The southern part is characterized by a thick (approx.…”

Section: Analysis and Interpretationmentioning

confidence: 97%

An aspect of the subsurface structure of the Burdur-Isparta area, SW Anatolia, based on gravity and aeromagnetic data, and some tectonic implications

Dolmaz

2007

Earth Planet Sp

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Gravity and aeromagnetic analyses were conducted in the Burdur-Isparta area of Turkey in order to identify the subsurface structure and tectonics of the region independent of surface cover. The analytic signal of the aeromagnetic anomalies was first calculated to delineate the source fields of these anomalies. The magnetic signatures were found to correlate well with the intrusives associated with the subduction of the African oceanic lithosphere and with the ophiolitic nappes in the region. The residual aeromagnetic anomalies mostly orientate in the N-S direction, implying the presence of remanent magnetization. Based on the shape analysis of aeromagnetic anomalies, the region appears to have rotated clockwise. The magnetic anomalies were found to continue upward to 5 km a.s.l. The upward continued map shows deep effects of the sub-crustal magnetic sources. Based on the Bouguer gravity anomalies, the thickness of the crust in the study area is between 33 and 37.5 km. Major extensive NE-and NW-as well as N-trending faults are identified that coincide with the Lake Burdur, Lake Beysehir and Kovada grabens, respectively. Lake Egirdir is also devoid of any magnetic sources. As a final step, the maxima of the horizontal gradient of the gravity data were calculated. The maxima show that the major geological formations and the structural trends in the area are remarkable. The boundaries of the various geological formations can be identified based on the boundary analysis of the gravity and the analytic signal of the aeromagnetic data. The change in the nature of the anomalies reflects the imprints of intense deformation associated with major tectonic activity of the African-Eurasian plate convergence zone.

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Upper crustal electrical resistivity structures in the vicinity of the Çatalca Fault, Istanbul, Turkey by magnetotelluric data

et al. 2013

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The Deep Resistivity Structure of Southwestern Turkey: Tectonic Implications

Cited by 13 publications

References 17 publications

Curie Point Depth variations to infer thermal structure of the crust at the African-Eurasian convergence zone, SW Turkey

Curie Point Depth variations to infer thermal structure of the crust at the African-Eurasian convergence zone, SW Turkey

An aspect of the subsurface structure of the Burdur-Isparta area, SW Anatolia, based on gravity and aeromagnetic data, and some tectonic implications

Upper crustal electrical resistivity structures in the vicinity of the Çatalca Fault, Istanbul, Turkey by magnetotelluric data

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