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Dive into the research topics where Fikret Koçbulut is active.

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Featured researches published by Fikret Koçbulut.


International Journal of Remote Sensing | 2009

Determination of neotectonic features of the Karasu Basin (SE Turkey) and their relationship with Quaternary volcanic activity using Landsat ETM+ imagery

Kaan Sevki Kavak; Orhan Tatar; J.D.A. Piper; Fikret Koçbulut; B. Levent Mesci

The junction between the East Anatolian and the Dead Sea fault zones lies close to an unstable F: Transform fault (FFF) triple junction where the African, Eurasian and Arabian plates meet in south-eastern Turkey. The Karasu Basin is an ephemeral rifted structure located close to the junction of these plate boundaries and is expressed by a range of tectono-morphological features. This study uses remote sensing to define tectonic structures and discriminate volcanic rocks linked to rifting within the basin using Landsat Enhanced Thematic Mapper Plus (ETM+) imagery. Prior to advanced image processing stages, images were corrected to eliminate atmospheric scattering effects and determine the best band combination for multi-spectral processing techniques based on statistical methods. Following pre-processing stages, edge detection filters were applied to derive tectonic structures defining the basin. The Brovey transformation, a statistical data merging method, was used to combine reflective multi-spectral bands with the Landsat ETM+ panchromatic band. This method fuses higher spatial data with data of lower spatial value. The western margin of the Karasu Basin is defined by the left-lateral Amanos Fault Zone with a contemporary motion (c. –0.4 mm a−1) probably accommodating most of the left-lateral strike-slip motion between Arabian and African plates on the northern continuation of the Dead Sea Fault Zone. The rift zone has been the site of extensive recent volcanism concentrated within the Brunhes Chron (<0.78 Ma) and linked to fault block rotations between the intracontinental master faults. The boundaries of this activity are defined here using a regolith mapping technique.


IOP Conference Series: Earth and Environmental Science | 2008

Post-collisional deformation of the Anatolides and motion of the Arabian indenter: A paleomagnetic analysis

J.D.A. Piper; Orhan Tatar; H. Gürsoy; B.L. Mesci; Fikret Koçbulut; Baochun Huang

In the Anatolides of Turkey the neotectonic (post collisional) phase of deformation embraces the period since final closure of the southern arm of Neotethys in mid-Miocene times. The Arabian Shield indenter has continued to deform into the weak Anatolian accretionary collage resulting from subduction of this ocean by a combination of differential movement relative to the African Plate and counterclockwise (CCW) rotation. Much of resulting deformation has been accommodated by slip along major transforms comprising the North Anatolian Fault Zone (NAFZ), the East Anatolian Fault Zone (EAFZ) and the northward extension of the Dead Sea Fault Zone (DSFZ) but has also been distributed as differential block rotations through the zone of weak crust in between. Facets of this deformation comprise crustal thickening and uplift to produce the Anatolian Plateau, establishment of transform faults and tectonic escape as Arabia has continued to impinge into the Anatolian collage. Paleomagnetic analysis of this deformation is facilitated by the widespread distribution of neotectonic volcanism and graben infills, and rotations relative to the Eurasian reference frame are recognised on two scales. Rapid rotation (up to 5°/10,000 years) of small fault blocks is identified between master faults along the intracontinental transforms but deformation does not extend away from these zones and shows that seismogenic upper crust is decoupled from a lower continental lithosphere undergoing continuum deformation. The broad area of weak accreted crust between the transforms is dissected into large fault blocks which exhibit much lower rotation rates (mostly < 1°/100,000 years) that vary systematically across the Anatolides. Large CCW rotations near the Arabian indenter diminish westwards to become zero then CW near the limit of tectonic escape in western Turkey. The view that the collage has rotated anticlockwise as a single plate, either uniformly or episodically, during the Neotectonic era is refuted. Instead, deformation has been distributed and differential as the collage has adapted to changing tectonic regimes. Crustal extrusion to the west and south has expanded the curvature of the Tauride Arc and combined with retreat of the Hellenic Arc to produce the extensional horst and graben province in western Turkey. A challenge of present work is to resolve the temporal framework of tectonic rotation. Evidence from the Cappadocian volcanic province and Sivas Basin in central Anatolia indicates that rotation has been concentrated within the last 2–3 million years of the neotectonic era and therefore correlates with establishment of the intracontinental transform framework. Thus we recognise two phases to the evolution of this sector of the orogen: the first embraces crustal thickening and uplift with initiation defined specifically by transition from marine to terrestrial deposition in the Serravallian at ~12 Ma, and the second embraces crustal extrusion to the west motivated by continuing northward movement of Arabia and roll back on the Hellenic Arc since late Pliocene times. Latitudinal motions detected by paleomagnetism are close to confidence limits and consistent with small northward motion of the Anatolides since Eocene times including up to a few hundred km of closure linked to crustal thickening since the demise of NeoTethys. The driving motion from the Arabian indenter can be partially resolved from the widespread basaltic volcanism that occurred along the periphery of the Arabian Shield at 12–18 Ma during final stages of collision along the Bitlis Suture. This defines CCW rotation of 13–21° with respect to Eurasia. An average CCW rotation of 0.9°/Myr since closure of the Bitlis Suture in mid-Miocene times is unlikely to have been uniform because it has been linked to three adjoining interactions namely episodic opening of the Red Sea, a transition from crustal thickening to tectonic escape in the Anatolian collage and variable rates of strike slip motion on the DSFZ.


Geodinamica Acta | 2012

Palaeomagnetic investigation of Cenozoic volcanic rocks bordering the North Anatolian Fault Zone, Reşadiye and Koyulhisar Districts, central-east Anatolia, Turkey

Fikret Koçbulut

A palaeomagnetic study is reported from the lavas of Eocene, Miocene and Pliocene age cropping out immediately to the north of the North Anatolian Fault Zone (NAFZ) in the Reşadiye–Mesudiye region of central-eastern Anatolia. Rock magnetic investigations identify a high percentage of multi-domained magnetite as the dominant ferromagnet in these rocks and this probably accounts for a relatively poor response to alternating field and thermal demagnetisation. Thirty of 37 units yielded acceptable groupings of characteristic magnetisation directions. An earlier study indicated small anticlockwise crustal block rotation in this region since Upper Cretaceous times (D/I = 347/50°), and our study indicates that this was overtaken by clockwise rotation in Eocene times (D/I = 40/47°), although sample size control from the Palaeogene is poor. Results from later Miocene (D/I = 2/62°) and Pliocene (D/I = 0/53°) volcanic rocks indicate that no significant tectonic rotation has occurred in the north of the NAFZ in Neogene times. This contrasts with rotations in the weaker crust comprising the Anatolian collage south of the NAFZ, where differential and sometimes large anticlockwise rotations occurred during the latter part of the Neogene.


Tectonophysics | 2004

Neotectonic deformation in the transition zone between the Dead Sea Transform and the East Anatolian Fault Zone, Southern Turkey: a palaeomagnetic study of the Karasu Rift Volcanism

Orhan Tatar; J.D.A. Piper; H. Gürsoy; A. Heimann; Fikret Koçbulut


Tectonophysics | 2012

Crustal deformation and kinematics of the Eastern Part of the North Anatolian Fault Zone (Turkey) from GPS measurements

Orhan Tatar; Fatih Poyraz; Halil Gürsoy; Ziyadin Cakir; Semih Ergintav; Zafer Akpınar; Fikret Koçbulut; Fikret Sezen; Tarık Türk; Kemal Ö. Hastaoğlu; Ali Polat; B. Levent Mesci; Önder Gürsoy; I. Ercüment Ayazlı; R. Cakmak; Alpay Belgen; Hakan Yavasoglu


Tectonophysics | 2010

Distributed neotectonic deformation in the Anatolides of Turkey: A palaeomagnetic analysis

J.D.A. Piper; H. Gürsoy; Orhan Tatar; Myrl E. Beck; A. Rao; Fikret Koçbulut; B.L. Mesci


Journal of Geodynamics | 2011

Palaeomagnetic study of the Kepezdağ and Yamadağ volcanic complexes, central Turkey: Neogene tectonic escape and block definition in the central-east Anatolides

H. Gürsoy; Orhan Tatar; J.D.A. Piper; Fikret Koçbulut; Zafer Akpınar; Baochun Huang; Andrew P. Roberts; B.L. Mesci


Tectonophysics | 2009

Palaeomagnetic study of Tertiary volcanic domains in Southern Turkey and Neogene anticlockwise rotation of the Arabian Plate

H. Gürsoy; Orhan Tatar; J.D.A. Piper; A. Heimann; Fikret Koçbulut; B.L. Mesci


Journal of Volcanology and Geothermal Research | 2013

Palaeomagnetism of the Cappadocian Volcanic Succession, Central Turkey: Major ignimbrite emplacement during two short (Miocene) episodes and Neogene tectonics of the Anatolian collage

J.D.A. Piper; Fikret Koçbulut; H. Gürsoy; Orhan Tatar; Lothar Viereck; P. Lepetit; Andrew P. Roberts; Zafer Akpınar


Journal of Geodynamics | 2013

Palaeomagnetic evidence for the neotectonic evolution of the Erzincan Basin, North Anatolian Fault Zone, Turkey

Orhan Tatar; Zafer Akpınar; Halil Gürsoy; J.D.A. Piper; Fikret Koçbulut; B. Levent Mesci; Ali Polat; Andrew P. Roberts

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J.D.A. Piper

University of Liverpool

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