Neogene anticlockwise rotation of central Anatolia (Turkey): preliminary palaeomagnetic and geochronological results

Platzman, Ellen; Tapirdamaz, C.; Sanver, M.

doi:10.1016/s0040-1951(98)00204-2

Cited by 104 publications

(95 citation statements)

References 30 publications

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“…[63] Previous reviews of paleomagnetic data from Turkey (largely ignoring the possibility of local, e.g., strike-slipinduced rotations) have suggested that the Anatolian microplate as a whole underwent a 20°-30°counterclockwise rotation phase since the middle Miocene [Platzman et al, 1998;Kissel et al, 2003]. This is not in line with our data from northwestern Turkey: if we compare our findings with Figure 10.…”

Section: Timing and Amount Of Rotations In Western Turkeycontrasting

confidence: 74%

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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Section: Timing and Amount Of Rotations In Western Turkeycontrasting

confidence: 74%

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

et al. 2010

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“…Our compilation of previously published paleomagnetic results from the upper Miocene to Pliocene rocks from the Cappadocia volcanic region, sampled across a large area of the southern Kırşehir Block Piper et al, 2002bPiper et al, , 2013Platzman et al, 1998), yielded a minor counterclockwise rotation of 6 ± 3 • , suggesting that significant rotations predated the late Miocene. The poorly dated but presumed Miocene Postallı locality in the northern part of the basin suggests a counterclockwise rotation of 17.7 ± 5.4 • , suggesting that part of the rotation may have extended into the Miocene, although the small areal coverage of the site cannot exclude a local rotation origin.…”

Section: Regional Vs Local Rotation In the Ulukışla Basinmentioning

confidence: 71%

“…In the laboratory, the cores were cut into specimens of 22 mm length using a double-blade circular saw. Platzman et al, 1998;3: Piper et al, 2002;4: Kissel et al, 2003;5: Meijers et al, 2010;6: Gürsoy et al, 2011;7: Meijers et al, 2011;8: Lucifora et al, 2012; 9: Lefebvre et al, 2013;10: Piper et al, 2013;11: Çinku et al, 201611: Çinku et al, 12: Baydemir, 199013: Channel et al, 1996;14: Orbay and Bayburdi, 1979;15: van der Voo, 1968. geographic coordinates tectonic coordinates…”

Section: Samplingmentioning

confidence: 99%

“…Finally, we calculated an average paleomagnetic direction for the upper Miocene to Pliocene volcanic rocks of Cappadocia overlying the AAB Block by combining lava sites previously published by Çinku et al (2016), Piper et al (2002aPiper et al ( , b, 2013, and Platzman et al (1998). These yield a mean (n = 77) with an A 95 (2.8) within the A 95 min−max envelope (2.1, 5.3).…”

Section: Gürer Et Al: Timing and Distribution Of Cenozoic Rotatiomentioning

confidence: 99%

“…The folder with.pmag files contains the statistical parameters of sites and localities discussed in this paper, which are provided as separate files for the Ulukışla, Sivas, and Tauride basins. In addition, we provide a file with parametrically sampled literature data compiled from Baydemir (1990), Channell et al (1996), Cinku et al (2016), Gürsoy et al (2003), Hisarlı et al (2016, Kissel et al (2003), Lefebvre et al (2013), Lucifora et al (2012), Meijers et al (2010, and references therein), Orbay and Bayburdi (1979), Piper et al (2002aPiper et al ( , b, 2013, Platzman et al (1998), Saribudak (1989), Tatar et al (2000), and Van der Voo (1968).…”

Section: Supplementary Informationmentioning

confidence: 99%

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Paleomagnetic constraints on the timing and distribution of Cenozoic rotations in Central and Eastern Anatolia

et al. 2018

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Abstract. To quantitatively reconstruct the kinematic evolution of Central and Eastern Anatolia within the framework of Neotethyan subduction accommodating Africa-Eurasia convergence, we paleomagnetically assess the timing and amount of vertical axis rotations across the Ulukışla and Sivas regions. We show paleomagnetic results from ∼ 30 localities identifying a coherent rotation of a SE Anatolian rotating block comprised of the southern Kırşehir Block, the Ulukışla Basin, the Central and Eastern Taurides, and the southern part of the Sivas Basin. Using our new and published results, we compute an apparent polar wander path (APWP) for this block since the Late Cretaceous, showing that it experienced a ∼ 30-35 • counterclockwise vertical axis rotation since the Oligocene time relative to Eurasia. Sediments in the northern Sivas region show clockwise rotations. We use the rotation patterns together with known fault zones to argue that the counterclockwise-rotating domain of south-central Anatolia was bounded by the Savcılı Thrust Zone and Deliler-Tecer Fault Zone in the north and by the African-Arabian trench in the south, the western boundary of which is poorly constrained and requires future study. Our new paleomagnetic constraints provide a key ingredient for future kinematic restorations of the Anatolian tectonic collage.

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The evolution of intraplate fault systems in central Turkey: Structural evidence and Ar-Ar and Rb-Sr age constraints for the Savcili Fault Zone

et al. 2014

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O and δ D) and trace element data indicate that fault gouge illites precipitated from deep basinal brines. These fluids were mobilized during phases of compressional deformation and migrated upward along thrust faults toward shallow brittle deformation zones. Rb-Sr and Ar-Ar geochronology of fault gouges in two cataclastic zones demonstrates age variability for two different dating techniques (Rb-Sr: 40.9 ± 1.5 Ma and 22.9 ± 1.3 Ma; Ar-Ar: 46.45 ± 0.25 Ma and 29.8 ± 0.13 Ma). We argue that Rb-Sr dating provides ages more closely reflecting the timing of fault movements because of potential contamination of illite by excess 40 Ar. Accordingly, the SFZ was active during at least two phases; the middle Eocene and late Oligocene to early Miocene, which is consistent with the relative age constraints suggested by field relationships. Geochronology combined with structural field evidence indicates a rapid change in stress regime from extension to contraction at~40 Ma that continued until at least~23 Ma. Direct dating of brittle faulting provides a prolific approach for determining the absolute timing of tectonic events in areas that have largely relied on indirect information.

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Neogene anticlockwise rotation of central Anatolia (Turkey): preliminary palaeomagnetic and geochronological results

Cited by 104 publications

References 30 publications

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

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

Paleomagnetic constraints on the timing and distribution of Cenozoic rotations in Central and Eastern Anatolia

The evolution of intraplate fault systems in central Turkey: Structural evidence and Ar-Ar and Rb-Sr age constraints for the Savcili Fault Zone

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