Palaeomagnetically defined rotations of fault-bounded continental blocks in the North Anatolian Shear Zone, North Central Anatolia

İşseven, Turgay; Tüysüz, Okan

doi:10.1016/j.jseaes.2005.11.012

Cited by 33 publications

(35 citation statements)

References 47 publications

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“…Those data suggest that the omega shape of the Çankırı Basin was caused by ongoing indentation of the Kırşehir Block and Anatolide-Tauride Block until the Oligocene, not affecting the central Pontides orocline (Figure 9). Several paleomagnetic data sets from Eocene rocks in the study by İşseven and Tüysüz [2006] are in agreement with this scenario. The absence of studies on pre-Eocene rocks does not enable constraining initiation of rotation in the Çankırı Basin.…”

Section: Discussionsupporting

confidence: 72%

Late Cretaceous to Paleocene oroclinal bending in the central Pontides (Turkey)

Meijers¹,

Kaymakçı

Hinsbergen³

et al. 2010

Tectonics

103

108

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The Turkish Pontide fold‐and‐thrust belt formed since the Paleozoic and is an important element in the Africa‐Eurasia convergence and the resulting closure of the Neo‐Tethys ocean. It has a peculiar arc‐shaped geometry in its central part, along the Black Sea coast, which may have resulted from oroclinal bending. We have determined the vertical‐axis rotation history of this area using paleomagnetism on Cretaceous to Eocene rocks from 47 sites and critically analyzed previously published data. We applied the same reliability criteria to all data. Our results show that late Cretaceous sites have clockwise and counterclockwise rotations perpendicular to the structural trend in the central Pontides. In the eastern Pontides, they show only local rotations. Paleocene to Eocene rocks in the central and eastern Pontides show no rotation. We conclude that the central Pontide northward arc‐shaped geometry results from oroclinal bending in latest Cretaceous to earliest Paleocene times. The timing and scale of geological processes that occurred in the region make it likely that orocline formation resulted from Neo‐Tethys closure between the Pontides and the metamorphic promontory of the Anatolide‐Tauride Block. Earlier studies on the southerly located Çankırı Basin reveal that clockwise and counterclockwise rotations occurred in Eocene‐Oligocene times. This implies that the entire region underwent continuous deformation from late Cretaceous to Eocene, caused by convergence of the Pontides and the Anatolide‐Tauride Block, with a southward moving deformation front. Deformation was first localized in the northern part of the central Pontides until the Paleocene, resulting in oroclinal bending, and from at least Eocene times it shifted toward the Çankırı Basin region.

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Section: Discussionsupporting

confidence: 72%

Late Cretaceous to Paleocene oroclinal bending in the central Pontides (Turkey)

Meijers¹,

Kaymakçı

Hinsbergen³

et al. 2010

Tectonics

103

108

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“…The most important and well-known of these branches is the Sungurlu (Ezinepazar) fault, on which deformation signs were not detected in this study, in concordance with Yavasoglu et al (2011). However, it is known that the 1939 Erzincan earthquake also fractured the Sungurlu fault (İşseven and Tüysüz, 2006). Despite this, there is a concentrated strain accumulation in Region-2, where the Sungurlu fault and the NAFZ main branch merge.…”

Section: Discussionmentioning

confidence: 42%

“…The main and secondary branches of the North Anatolian Fault have meant that the study area has been dissected into several continental blocks (Fig 1). According to recent research (İşseven and Tüysüz, 2006;Kozacı et al, 2007;Tatar et al, 2012), the continental blocks that are bordered by faults move independently in different directions around a vertical axis. Also, it is important to understand how the potential energy of deformation accumulates and releases regarding spatial and time variables.…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Analysis on the Çankiri-Bingöl Segment of the North Anatolian Fault in Turkey

Yavaşoğlu¹

2015

Earth sci. res. j.

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The North Anatolian Fault Zone (NAFZ) is one of the most important fault zones of Turkey and the world. It has produced several high magnitude earthquakes that have resulted in massive loss of lives and resources. National and international research on the North Anatolian Fault zone that Turkey resides on have been realized to better understand and predict the earthquakes produced by it. This study focuses on the Çankırı -Bingöl segment of the NAFZ. The aim of this study is to calculate the strain and latent earthquake potential of the studied area. For this purpose, geodetic data coming from several individual projects have been merged. Strain values have been calculated from the combined data and regions on the fault zone, and strain accumulations have been presented graphically. After calculation, Çankırı, Amasya and Kelkit regions were analyzed. The compressional and extensional deformation has been shown in north and south part of Çankırı basin, respectively. Eastern adjacent area of the Çankırı basin, Amasya region, has the primary branch of the NAF and its subbranches. In the Amasya region, the deformation is mostly on the main branch and the earthquake potential has risen to it. The Kelkit Valley has complex structures and inhomogeneous dispersion. Southeastern and Northwestern part of the Kelkit Valley has varied deformation in micro scale. Consequently, the study results indicate that strain accumulation is concentrated on areas such as the Çankırı basin, Amasya region, and various areas in the Kelkit Valley from west to east. La Zona de la Falla de Anatolia del Norte (NAFZ, del inglés North Anatolian Fault Zone) es una de las zonas de fallas más importantes de Turquía y del mundo. Esta falla ha generado varios terremotos de gran magnitud que han resultado en pérdidas humanas y de recursos. La investigación nacional e internacional de la Zona de la Falla de Anatolia del Norte, que atraviesa Turquía, se ha realizado con el fin de un mejor entendimiento y predicción de los terremotos que allí se originan. Este análisis se enfoca en el segmento Çankırı-Bingöl de la NAFZ. El objetivo es calcular la tensión y el potencial de terremoto del área de estudio. Con este propósito se recopiló la información geodésica de varios proyectos individuales. Los valores de tensión se calcularon de la información combinada de las regiones que componen la zona de falla y se presentan gráficamente las acumulaciones de tensión. Tras el cálculo de estos valores se analizaron las regiones Çankırı, Amasya y Kelkit. La deformación de compresión y la de extensión aparecen al norte y al sur de la cuenca Çankırı, respectivamente. El área ubicada al Este de la cuenca Çankırı, la región de Amasya, posee la rama principal de la NAFZ y sus subdivisiones. En la región de Amasya la deformación se presenta en la rama principal de la NAFZ, donde se eleva el potencial de movimientos sísmicos. El valle de Kelkit tiene estructuras complejas y dispersión no homogénea. El sudeste y el noroeste del valle Kelkit muestran una deformación variada a ...

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“…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 Resultsmentioning

confidence: 99%

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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Palaeomagnetically defined rotations of fault-bounded continental blocks in the North Anatolian Shear Zone, North Central Anatolia

Cited by 33 publications

References 47 publications

Late Cretaceous to Paleocene oroclinal bending in the central Pontides (Turkey)

Late Cretaceous to Paleocene oroclinal bending in the central Pontides (Turkey)

Strain Rate Analysis on the Çankiri-Bingöl Segment of the North Anatolian Fault in Turkey

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

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