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

Karcıoğlu, Gökhan; Tank, Sabri Bülent; Gürer, Ömer Feyzi; Çiftçi, Elif Tolak; Kaya, Tulay; Tunçer, Mustafa

doi:10.1007/s11200-011-0228-6

Cited by 4 publications

(4 citation statements)

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“…All these faults are sealed by Pliocene–Quaternary fluvial deposits (Turgut & Eseller, 2000). The large fault zone closest to the studied area, the Çatalca Fault (Karcıoğlu et al 2013) (Fig. 1), perhaps follows the alleged West Black Sea Fault, and it dips to the southwest according to magnetotelluric data.…”

Section: Geological Settingmentioning

confidence: 86%

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Eocene–Oligocene stratigraphy and structural history of the Karaburun area, southwestern Black Sea coast, Turkey: transition from extension to compression

Natal’in

Say

2015

Geol. Mag.

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The stratigraphic succession exposed in the Karaburun area (southern Black Sea coast, NW Turkey) records multiple changes in depositional and tectonic settings during Cenozoic times. It starts with the Middle-Upper Eocene Sogucak Formation of reef limestone that across a normal fault, omitting the lower part of the Lower Oligocene Ceylan Formation (deep-marine shale unit), abuts the upper part of the Ceylan Formation that is made up of two facies: (1) shallow-marine sandstone and (2) shallow-marine limestone units containing horizons of submarine slumps. Both facies are unconformably overlain by the fluvial Upper Miocene Çukurçeşme Formation. The tectonic record includes: (1) latest Eocene -Early Oligocene NE-SW extension, (2) Early Oligocene NE-SW shortening and (3) Late Miocene NW-NE extension. The earliest normal faults cutting the Sogucak and the lower part of the Ceylan formations are associated with clastic dykes injected into the deepmarine shale. These structures suggest a disruption of the Eocene carbonate platform and are also known in the neighbouring Thrace Basin. The following NE-SW shortening created the NE-vergent Karaburun Thrust that is synchronous with the shallowing and inversion of the Ceylan Basin. Rotation of the stress field is recorded by changes in clastic dyke orientation and their deformation. Compression caused multiple westerly directed submarines slides from uplifts in easterly located regions. This event is not recorded in the Thrace Basin. Finally, the Miocene tectonic activity formed NW-and NE-striking normal faults. The outlined tectonic history includes Early Oligocene extensional and compressional episodes recorded in the southern margin of the Black Sea that had hitherto not been known.

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Section: Geological Settingmentioning

confidence: 86%

“…Heavy long dashed lines indicate Late Miocene fault systems (Perinçek, 1991). The straight solid line is the Çatalca Fault (Karcıoğlu et al 2013). The box outlines the position of the studied region, the geological map of which is presented in Figure 2. …”

Section: Introductionmentioning

confidence: 99%

Eocene–Oligocene stratigraphy and structural history of the Karaburun area, southwestern Black Sea coast, Turkey: transition from extension to compression

Natal’in

Say

2015

Geol. Mag.

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“…A magnetotelluric profile across the Çakıl Fault also shows it to be a SW-dipping major structure (Karcıoğlu et al . 2013). The Çakıl Fault is one of several en échelon normal faults forming the northeastern boundary of the Thrace Basin.…”

Section: The çAtalca Ridge and The Thrace Basinmentioning

confidence: 99%

The Thrace Basin and the Black Sea: the Eocene–Oligocene marine connection

et al. 2017

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The Late Cretaceous – Recent West Black Sea Basin and the Eocene–Oligocene Thrace Basin are separated by the Strandja arch comprising metamorphic and magmatic rocks. Since Late Cretaceous time the Strandja arch formed a palaeo-high separating the two basins which accumulated clastic sediment of >9 km thickness. During late Eocene – early Oligocene time the marine connection between these basins existed through the Çatalca gap west of Istanbul. The Çatalca gap lies on the damage zone of a major Cretaceous strike-slip fault; it formed a 15 km wide marine gateway, where carbonate-rich sediments of thickness c. 350 m were deposited. The sequence consists of upper Eocene shallow marine limestones (SBZ18-20) overlain by upper Eocene – lower Oligocene (P16-P19 zones) pelagic marl with a rich fauna of planktonic foraminifera; the marls are intercalated with 31–32 Ma acidic tuff and calc-arenite beds. The Çatalca gap is bounded in the west by a major normal fault, which marks the eastern boundary of the Thrace Basin. Seismic reflection profiles, well data and zircon U–Pb ages indicate that the Thrace Basin sequence west of the fault is late Eocene – middle Oligocene (37–27 Ma) in age and that the fault has accommodated 2 km of subsidence. Although there was a marine connection between the West Black Sea and Thrace basins during late Eocene – early Oligocene time, no significant exchange of clastic sediment took place. Sedimentation in the Çatalca gap ended abruptly during early Oligocene time by uplift, and this eventually led to the paralic conditions in the Thrace Basin.

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“…However, in Iran and other countries, the mechanism of many significant faults has been investigated using magnetotelluric data. [5][6][7] In Sabalan, the first magnitude data was acquired in 1998 containing 212 soundings, 8 and the study of the Sabalan geothermal area has several years of history. In the following years, the acquisition of magnetotelluric data in this region with a frequency range of 0.003 Hz to 320 Hz was carried out in 13 stations in order to investigate more Sabalan geothermal field.…”

Section: Introductionmentioning

confidence: 99%

An application of magnetotelluric data inversion in a stratovolcano region

Amjadi¹

2020

PAIJ

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Sabalan, with an elevation of 4,811 meters, is the second-highest mountain located in the Alborz mountain range in northwestern Iran. Although it is an inactive stratovolcano, the overall system of faults around the Sabalan peak can be considered as two common groups of linear and arcuate faults. Faults with the linear structure are mainly observed along with the NW-SE and N-S directions at the southern part of Sabalan. Arcuate faults around the Sabalan volcano are almost coincided with the crater of the volcano and have led to the penetration of volcanic masses. In this study, magnetotelluric data modeling was performed on one profile ("namely the MM profile"). The profile includes both types of fault systems in the region. By assessing and interpreting the resistivity section of the MM profile by 2D magnetotelluric data inversion, we have clearly detected the faults by features such as displacement and sudden changes in resistivity anomalies forming conductive zones with low resistivity anomaly along with the profile. The MM profile has almost continuous conductive anomaly (<30 Ω-m) between elevations of 1000 to 3000 m except in the eastern side, where a resistive block is found from the surface down to lower depths. Eight faults were detected across the MM profile. Our final represented geology section is consistent with actual observations and 2D magnetotelluric data inversion and prior studies.

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

Cited by 4 publications

References 46 publications

Eocene–Oligocene stratigraphy and structural history of the Karaburun area, southwestern Black Sea coast, Turkey: transition from extension to compression

Eocene–Oligocene stratigraphy and structural history of the Karaburun area, southwestern Black Sea coast, Turkey: transition from extension to compression

The Thrace Basin and the Black Sea: the Eocene–Oligocene marine connection

An application of magnetotelluric data inversion in a stratovolcano region

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