Palaeomagnetic study of crustal deformation across an intracontinental transform: the North Anatolian Fault Zone in Northern Turkey

Piper, J. D. A.; Moore, Joanna M.; Tatar, Orhan; Gürsoy, Hali̇l; Park, R. G.

doi:10.1144/gsl.sp.1996.105.01.26

Cited by 33 publications

(27 citation statements)

References 20 publications

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“…According to these previous results from studies carried out both in the vicinity of and far away from the NAF, it is of large interest that no significant clockwise rotation occurred in the Miocene. As defined by Piper et al (1996Piper et al ( , 1997, large rotations only took place in the vicinity of the master fault, which is in agreement with the simple ball-bearing model of Beck (1976). However, Isseven and Tuysuz (2006) recently proposed that clockwise rotations could occur in fault-bounded blocks within the NAF, as well as be detected in Eocene rocks.…”

Section: Previous Paleomagnetic Resultssupporting

confidence: 87%

The origin of Neogene tectonic rotations in the Galatean volcanic massif, central Anatolia

Çinku

Orbay

2008

Int J Earth Sci (Geol Rundsch)

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A paleomagnetic study was carried out on Neogene volcanic rocks at 30 sites within the Galatean massif (40.4°N, 31.5°E) to determine possible block rotations due to stress variations. Two phases of rotation could be characterized as the result of Neogene volcanic activity. We suggest that the first stage of rotation was isolated in Early Middle Miocene calc-alkali rocks, with a relative counterclockwise rotation of R ± DR = -20.2 ± 9.3°w ith respect to Eurasia. This accommodates the southwestward rotational collapse of the Western Anatolia peninsula across a pole on the Bitlis suture. In the neotectonic period, on other hand, a relative clockwise rotation of R ± DR = 27.3 ± 6.4°with respect to Eurasia is predicted. In contrast to the uniform clockwise rotations, extremely large clockwise rotations up to 264°are restricted in a narrow zone between two dextral faults. We believe that the second stage rotations support the idea of individual microblock rotations due to deformation along the North Anatolian Fault zone.

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Section: Previous Paleomagnetic Resultssupporting

confidence: 87%

The origin of Neogene tectonic rotations in the Galatean volcanic massif, central Anatolia

Çinku

Orbay

2008

Int J Earth Sci (Geol Rundsch)

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“…Clockwise rotations in Anatolia are mainly limited to strike-slip-related rotations within the North Anatolian Fault Zone [Tatar et al, 1995;Piper et al, 1996Piper et al, , 1997, although even that is debated [Platzman et al, 1994], and the Afyon region lies well outside of the strands of this fault zone. It is possible that the shortening that we postulate to accommodated the rotation of the Bey Dağları region is accommodated by distributed right-lateral shear, leading to clockwise rotations in the Afyon area.…”

Section: Identification Of the Rotation Polementioning

confidence: 99%

Exhumation with a twist: Paleomagnetic constraints on the evolution of the Menderes metamorphic core complex, western Turkey

et al. 2010

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Much remains to be understood about the links between regional vertical axis rotations, continental extension, and shortening. In western Turkey, Miocene vertical axis rotations have been reported that occur simultaneously with the extensional exhumation of the Menderes metamorphic core complex, which has been related to back‐arc extension in the eastern part of the Aegean back arc. In this paper we explore the spatial and temporal relationships between vertical axis rotations in southwestern Turkey and extensional unroofing of the Menderes Massif. To this end, we provide a large set of new paleomagnetic data from western Turkey, and integrate these with the regional structural evolution to test the causes and consequences of oroclinal bending in the Aegean region. The Lycian Nappes and Bey Dağları are shown to rotate ∼20° between 16 and 5 Ma, defining the eastern limb of the Aegean orocline. This occurred contemporaneously with the exhumation of the central Menderes Massif (along extensional detachments) and after the latest Oligocene to early Miocene exhumation of the northern and southern Menderes massifs. Exhumation of the latter two was not associated with vertical axis rotations. The lower Miocene volcanics in the region from Lesbos to Uşak, to the north of the central Menderes Massif underwent a small clockwise rotation, insignificant with respect to Eurasia. This shows that exhumation of the central Menderes Massif was associated with a vertical axis rotation difference between the northern and southern Menderes massifs of ∼25°–30°. This result is in excellent agreement with the angle defined by the trends of Büyük Menderes and Alaşehir detachments, as well as the angle defined by the regionally curving stretching lineation pattern across the central Menderes Massif. These structures define a pivot point (rotation pole) for the west Anatolian rotations. The rotation of the southern domain, including the southern Menderes Massif, the Lycian Nappes, and Bey Dağları, must have led to N–S contraction east of this pole. The eastern limit of the rotating domain is formed by the transpressional couple of the Aksu thrust and Kırkkavak Fault in the center of the Isparta angle. Previously reported clockwise rotations in the volcanic fields near Afyon may be the result of distributed N–S shortening east of the pivot point. The precise accommodation of this shortening history remains open for investigation. Late Oligocene to early Miocene extension in the eastern part of the Aegean back arc was NE–SW oriented and likely bounded by a discrete transform. This transform may be associated with an early evolution of the eastern Aegean subduction transform edge propagator fault. Oroclinal bending in the west Anatolian region is likely related to a reconnection of the eastern part of the Aegean orocline with the African northward moving plate in tandem with roll back in the Aegean back arc, comparable to a recently postulated scenario for western Greece.

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“…Platzman et al [1994] provided paleomagnetic data from Niksar, along a transect across the NAF, that indicate approximately 30°of counterclockwise (CCW) rotation. In the Pontides, Piper et al [1996Piper et al [ , 2010 detected CCW rotations in Middle Eocene lavas on both sides of the NAF. They interpreted their results in terms of block rotations on second-order faults that splayed westward from the NAF during the neotectonic period.…”

Section: Previous Paleomagnetic Studies and Tectonic Modelsmentioning

confidence: 99%

“…[30] In order to evaluate the rotational history of the study area since the Middle Eocene, a large database was compiled using not only our paleomagnetic results, but also the earlier data of Sarıbudak [1989], Tatar et al [1995], Piper et al [1996], and İşseven and Tüysüz [2006], as obtained from 92 different sites (Appendix A).…”

Section: Synthesis Of Cenozoic Paleomagnetic Data From North Central mentioning

confidence: 99%

“…Also shown is the shaded paleomagnetic sampling area in the central Pontides and the eastern Sakarya Zone. tectonic evolution of the Anatolian plate, as well as the block rotations caused by tectonic deformation across the various fault zones [Sarıbudak, 1989;Platzman et al, 1994;Tatar et al, 1995Tatar et al, , 1996Piper et al, 1996Piper et al, , 1997Kaymakcı et al, 2003a;İşseven and Tüysüz, 2006].…”

Section: Introductionmentioning

confidence: 99%

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Middle Eocene paleomagnetic data from the eastern Sakarya Zone and the central Pontides: Implications for the tectonic evolution of north central Anatolia

et al. 2011

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A paleomagnetic investigation has been carried out on Middle Eocene volcanic rocks at 23 sites in the eastern Sakarya Zone and the central Pontides of north central Anatolia in order to better understand the regional tectonic evolution of the main zones of northeastern Anatolia in the Middle Eocene. The results constrain the tectonic evolution of the area when evaluated in conjunction with earlier published paleomagnetic directions from 92 localities. Small counterclockwise rotations in the range of R ± ΔR = −1.3 ± 1.4° to R ± ΔR = −17.2 ± 16.8°, with respect to Eurasia, are observed in the central Pontides on the northern side of the North Anatolian Fault (NAF). Clockwise rotations ranging between R ± ΔR = 8.5 ± 15.1° and R ± ΔR = 29.7 ± 12.0° are observed between the NAF and the Sungurlu Fault (SF), in the eastern Sakarya zone. Counterclockwise rotations of R ± ΔR = −18.9 ± 12.4° to R ± ΔR = −42.2 ± 6.9° are observed to the south of the SF. Our findings, combined with previous data, support the indentation model of Kaymakcı et al. (2000, 2003a, 2003b), which postulates the collision and northeast directed indentation of the Kırşehir Block into the Sakarya Zone. This model, which was developed to explain the evolution of the Çankırı Basin, can also explain the variable magnitudes of paleomagnetically determined rotations, thrust directions, and the curvature of the North Anatolian ophiolite belt.

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Palaeomagnetic study of crustal deformation across an intracontinental transform: the North Anatolian Fault Zone in Northern Turkey

Cited by 33 publications

References 20 publications

The origin of Neogene tectonic rotations in the Galatean volcanic massif, central Anatolia

The origin of Neogene tectonic rotations in the Galatean volcanic massif, central Anatolia

Exhumation with a twist: Paleomagnetic constraints on the evolution of the Menderes metamorphic core complex, western Turkey

Middle Eocene paleomagnetic data from the eastern Sakarya Zone and the central Pontides: Implications for the tectonic evolution of north central Anatolia

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