Conductivity Structure along the Gediz Graben, West Anatolia, Turkey: Tectonic Implications

Gürer, Aysan; Gürer, Ömer Feyzi; Pince, Alaattin; Ilkişik, O. Metin

doi:10.1080/00206810109465065

Cited by 45 publications

(14 citation statements)

References 14 publications

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“…The oblique-slip scissor faults in our study area are consistent with the transfer fault kinematics documented from other rift basins, and they are likely to have evolved to facilitate differential uplift and exhumation rates of the Menderes core complex in the footwall of the detachment surface and differential displacement of the basin strata along this detachment surface. Gravity and magnetotelluric modeling by Gürer et al (2001) has shown that these NNE-trending oblique-slip scissor faults continue northward beneath more than 1-km-thick sediments of the modern Alasehir graben, separating a series of subbasins and horst structures with different subsurface topographic features and depositional thicknesses. …”

Section: Oblique-slip Scissor (Hinge) Faultsmentioning

confidence: 99%

“…Yilmaz et al (2000) reported that the NNE-trending grabens locally occur as "hanging grabens" in the footwalls of the E-W-trending ones, and that the trapped structures and sedimentary units of these older NNE-trending grabens are distinguishable in seismic profi les. Two-dimensional (2-D) gravity and magnetotelluric modeling of the structure of the Gediz-Alasehir graben has revealed the existence of a series of these NE-SW-rending grabens and sub-basins at depth (Gürer et al, 2001), indicating that the regional structural fabric seen at the surface continues beneath the Quaternary sedimentary fi ll of the E-W-trending modern graben system. The E-W-trending grabens, which developed as a result of net N-S extension and block faulting, appear to have formed later, in the latest Miocene and Quaternary.…”

Section: Extensional Graben Systems and Sedimentary Basins In The Menmentioning

confidence: 99%

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Supradetachment basin evolution during continental extension: The Aegean province of western Anatolia, Turkey

Oner

Dilek

2011

Geological Society of America Bulletin

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We present a detailed structural and stratigraphic record of a Neogene-Quaternary supradetachment sedimentary succession in the Aegean extensional province of western Anatolia, and we compare its tectonic features and evolution to those of other well-documented supradetachment basins around the world. The sedimentary fill of the Alasehir basin records the uplift and exhumation of a core complex in the footwall of a detachment fault within the Central Menderes Massif. Accumulation of footwall-derived clastic sediments in this basin started ca. 20 Ma, shortly after the initiation of the approximately E-W-trending Alasehir detachment and its shear zone, and continued until ca. 2 Ma. Major sedimentary facies types include fl uvial and alluvial-fan deposits, debris-fl ow and mass-fl ow deposits, and locally developed lacustrine rocks. These sedimentary units were accumulated largely in distal depocenters within the extending basin, as the low-angle (15°-28°) detachment faulting created little accommodation space near the basin margins while producing high back-shed topography in the uplifted Menderes core complex. The drainage system was dominated mainly by extension-parallel transverse streams during the main phases of basin evolution. Extension-parallel, scissor (hinge) faulting produced differential uplift and subsidence in the adjacent fault blocks, changed the direction of sediment transport and drainage patterns over short distances, and resulted in the local uplift of the older basin strata. These processes led to the development of subbasins with lateral variations in basement topography, strata thickness, and sedimentary facies distribution, and generated a segmented basin archi tec ture. High-angle synthetic and antithetic faults that formed extensively after 3 Ma caused back-tilting of the sedimentary strata, formation of half grabens with their own axial drainage systems, and development of angular unconformities. With the onset of this crustal-scale block faulting, the detachment fault ceased to operate, and the Quaternary Gediz graben started to develop at the northern end of the Alasehir supra detachment basin. Our comparative evaluation of select basins shows a maximum sediment thickness of 3 km, average extension rates of 6 to 8-9 mm yr -1 , and accumulation rates of 0.1-0.2 mm yr -1 (uncorrected for compaction) in supra detachment basins in general. The rates and amounts of extension, the geom etry of detachment faulting, the rates of footwall uplift, and the kinematics and interplay of different fault systems are the most important factors controlling threedimensional structural architecture and evolution of supradetachment basins.For permission to copy, contact editing@geosociety.org

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Section: Oblique-slip Scissor (Hinge) Faultsmentioning

confidence: 99%

Section: Extensional Graben Systems and Sedimentary Basins In The Menmentioning

confidence: 99%

Supradetachment basin evolution during continental extension: The Aegean province of western Anatolia, Turkey

Oner

Dilek

2011

Geological Society of America Bulletin

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“…Additionally, average heat flow is approximately 110 mW/m 2 (e.g., ıLKıS¸ıK, 1995; GÜ RER et al, 2001;AYDıN et al, 2005;AKıN et al, 2006) for the region and the pick values can reach as high as 229 mW/m 2 . High heat- (2006) showed that Moho depth is about 28 and 30 km around Bozdag and Kula, respectively.…”

Section: Problems For Researchmentioning

confidence: 99%

The Geoelectrical Structure of Northwestern Anatolia, Turkey

Ulugergerli

Seyítoğlu

Başokur

et al. 2007

Pure appl. geophys.

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The magnetotelluric method has been employed to generate a geoelectrical model that will reveal the rich geological pattern and dynamic character of western and northwestern Anatolia, Turkey. Magnetotelluric data were collected from 53 sites along a profile of 290 km from the Dardanelles to the Alaş ehir Graben. Magnetotelluric data were in the range of 0.00055 Hz to 320 Hz. The models were obtained through 2-D joint inversion of transverse electric and transverse magnetic modes. Lateral changes in geoelectrical models are verified by using gravity and magnetic data. In addition, some of the seismological data presented here agree with proposed models that suggest a brittle-ductile structure boundary at a depth of 20 km. Generally speaking, a regional extensional regime caused reduction in the thickness of the crust and consequent uplift towards the south. The constructed model delineates the western part of the North Anatolian Fault Zone along the Biga Peninsula. The current patterns of volcanic activity on the Biga Peninsula and at Kula are related to conductive spots presented in the models. The border of the Go¨rdes Basin, located between the Izmir -Ankara suture zone and the Menderes Massif, is also well delineated. The North Anatolian Fault Zone presents a pattern in which density and susceptibility anomalies attain relatively high values. Fillings covering most of the surface have lower density and susceptibility values than those of underlying structures.

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“…The E-W-trending basins and associated faults are the most distinctive features of western Anatolia (e.g. Şengör, 1979;Yılmaz et al, 2000;Gürer et al, 2001;Bozkurt, 2003;Gürer et al, 2009Gürer et al, , 2014Yılmaz et al, 2010).…”

Section: Introductionmentioning

confidence: 98%

Plio-Quaternary kinematic development and paleostress pattern of the Edremit Basin, western Turkey

et al. 2016

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Conductivity Structure along the Gediz Graben, West Anatolia, Turkey: Tectonic Implications

Cited by 45 publications

References 14 publications

Supradetachment basin evolution during continental extension: The Aegean province of western Anatolia, Turkey

Supradetachment basin evolution during continental extension: The Aegean province of western Anatolia, Turkey

The Geoelectrical Structure of Northwestern Anatolia, Turkey

Plio-Quaternary kinematic development and paleostress pattern of the Edremit Basin, western Turkey

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