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

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

10.5194/se-2017-66 ◽

2017 ◽

Cited By ~ 3

Author(s):

Derya Gürer ◽

Douwe J. J. van Hinsbergen ◽

Murat Özkaptan ◽

Iverna Creton ◽

Mathijs R. Koymans ◽

...

Keyword(s):

Vertical Axis ◽

Western Boundary ◽

Eastern Anatolia ◽

The North ◽

Kinematic Evolution ◽

South Central ◽

Sivas Basin ◽

Thrust Zone ◽

Axis Rotation ◽

Central Turkey

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 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 block – comprising the southern Kırşehir Block, the Ulukışla basin, the Central and Eastern Taurides, and the southern part of the Sivas basin. This block experienced a ~ 30° counter-clockwise vertical axis rotation since Oligocene time. Sediments in the northern Sivas region show clockwise rotations. We use the rotation patterns together with known fault zones to argue that the counter-clockwise rotating domain of south-central Turkey 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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Paleomagnetism of the late Paleozoic Slide Mountain terrane, northern and central British Columbia

Canadian Journal of Earth Sciences ◽

10.1139/e93-168 ◽

1993 ◽

Vol 30 (9) ◽

pp. 1898-1913 ◽

Cited By ~ 14

Author(s):

David R. Richards ◽

Robert F. Butler ◽

Tekla A. Harms

Keyword(s):

British Columbia ◽

Vertical Axis ◽

Natural Remanent Magnetization ◽

Tilt Test ◽

Lower Permian ◽

Polar Wander ◽

The North ◽

Apparent Polar Wander Path ◽

Reversed Polarity ◽

Axis Rotation

Paleomagnetic samples were collected from Mid-Pennsylvanian to Lower Permian red argillaceous cherts at two localities of the Slide Mountain terrane: 18 sites from the Sylvester allochthon in northern British Columbia and 11 sites from Sliding Mountain in central British Columbia. A secondary component of natural remanent magnetization in the Sylvester samples yields a paleomagnetic pole that can be brought into coincidence with the Jurassic portion of the North American apparent polar wander path by inferring vertical-axis rotation during obduction of the allochthon. Both localities yield a characteristic component (ChRM) with unblocking temperatures from 650 to 680 °C. After structural correction for bedding tilt, all inclinations of ChRM are negative, consistent with magnetization during a reversed-polarity interval in the northern hemisphere. Site-mean ChRM directions show consistent inclinations but distinct stratigraphic groupings of declinations. Inclination-only statistics indicate that the ChRM passes a tilt test within the Sylvester allochthon and regionally between the two localities. The ChRM was apparently acquired prior to structural imbrication within the Sylvester section and regional differential tilting. We interpret the ChRM to be a primary magnetization acquired at or soon after deposition during the Permo-Carboniferous reversed-polarity superchron. The mean ChRM inclination of −16.7° ± 6.0° from the Sylvester allochthon indicates a paleo-latitude of 8.8° ± 3.4°N, which is corroborated by a paleolatitude of 1.9° ± 1.5°N from the Sliding Mountain locality. When compared with expected Pennsylvanian–Permian paleolatitudes, a net poleward translation of 20.3 ± 3.7° is implied for at least the sampled lithotectonic component of the Sylvester allochthon.

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Paleomagnetism of fluorite veins in the Devonian St. Lawrence granite, Newfoundland, Canada

Canadian Journal of Earth Sciences ◽

10.1139/e08-045 ◽

2008 ◽

Vol 45 (9) ◽

pp. 969-980 ◽

Cited By ~ 1

Author(s):

K. Kawasaki ◽

D. T.A. Symons

Keyword(s):

Vertical Axis ◽

Zircon Age ◽

Polar Wander ◽

The North ◽

Apparent Polar Wander Path ◽

Vertical Vein ◽

Significant Difference ◽

Appalachian Orogen ◽

The Mean ◽

The Difference

Paleomagnetic results are reported from the Devonian St. Lawrence granite and the fluorite veins within the granite or its related porphyry dikes. Paleomagnetic analysis of 359 specimens from 29 sites shows that there is no statistically significant difference at 95% confidence between the site mean characteristic remanent magnetization (ChRM) directions carried by pyrrhotite and (or) magnetite of the granite and fluorite veins. No post-granite metamorphic event is known in the area. Thus, these concordant directions indicate that the granite and fluorite veins are coeval and retain a primary remanence. However, the mean ChRM direction of 25 vein and granite sites yields an Early Pennsylvanian paleopole of ∼316 Ma on the North American apparent polar wander path at 35.5°N, 129.2°E (A95 = 3.4°) that is younger than the 374 ± 2 Ma Devonian U–Pb zircon age for the granite. Two intersecting vertical vein sets indicate that the St. Lawrence granite has not been tilted since emplacement of the fluorite veins. Therefore, the difference between the measured and expected paleopoles is interpreted to result from a postemplacement counterclockwise rotation of ∼17° of the St. Lawrence granite region about a vertical axis. Analysis of Carboniferous paleopoles in the northern Appalachian orogen indicates the rotation at the St. Lawrence area is Late Devonian during the Acadian orogeny.

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Paleomagnetism of the Lawrenceton Formation volcanic rocks, Silurian Botwood Group, Change Islands, Newfoundland

Canadian Journal of Earth Sciences ◽

10.1139/e89-024 ◽

1989 ◽

Vol 26 (2) ◽

pp. 296-304 ◽

Cited By ~ 10

Author(s):

Julie E. Gales ◽

Ben A. van der Pluijm ◽

Rob Van der Voo

Keyword(s):

North American ◽

Volcanic Rocks ◽

Mobile Belt ◽

Structural Mapping ◽

Polar Wander ◽

The North ◽

Apparent Polar Wander Path ◽

Paleomagnetic Study ◽

North American Craton

Paleomagnetic sampling of the Lawrenceton Formation of the Silurian Botwood Group in northeastern Newfoundland was combined with detailed structural mapping of the area in order to determine the deformation history and make adequate structural corrections to the paleomagnetic data.Structural analysis indicates that the Lawrenceton Formation experienced at least two folding events: (i) a regional northeast–southwest-trending, Siluro-Devonian folding episode that produced a well-developed axial-plane cleavage; and (ii) an episode of local north-trending folding. Bedding – regional cleavage relationships indicate that the latter event is older than the regional folding.Thermal demagnetization of the Lawrenceton Formation yielded univectorial southerly and shallow directions (in situ). A fold test on an early mesoscale fold indicates that the magnetization of the Botwood postdates this folding event. However, our results, combined with an earlier paleomagnetic study of nearby Lawrenceton Formation rocks, demonstrate that the magnetization predates the regional folding. Therefore, we conclude that the magnetization occurred subsequent to the local folding but prior to the period of regional folding.While a tectonic origin for local folding cannot be entirely excluded, the subaerial nature of these volcanics, the isolated occurrence of these folds, and the absence of similar north-trending folds in other areas of eastern Notre Dame Bay suggest a syndepositional origin. Consequently, the magnetization may be nearly primary. Our study yields a characteristic direction of D = 175°, I = +43°, with a paleopole (16°N, 131 °E) that plots near the mid-Silurian track of the North American apparent polar wander path. This result is consistent with an early origin for the magnetization and supports the notion that the Central Mobile Belt of Newfoundland was adjacent to the North American craton, in its present-day position, since the Silurian.

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Paleomagnetism of the komatiitic basalts of the Ottawa Islands, N.W.T.

Canadian Journal of Earth Sciences ◽

10.1139/e85-056 ◽

1985 ◽

Vol 22 (4) ◽

pp. 553-566 ◽

Cited By ~ 2

Author(s):

K. L. Buchan ◽

W. R. A. Baragar

Keyword(s):

North American ◽

Hudson Bay ◽

The West ◽

Magnetization Direction ◽

Polar Wander ◽

The North ◽

Dominant Component ◽

Apparent Polar Wander Path

The komatiitic basalts of the Ottawa Islands in eastern Hudson Bay are on strike with and believed to form a continuation of similar units of the Cape Smith Belt 150 km to the northeast. Units sampled in the Ottawa Islands all dip gently to the west and hence are not suitable for an internal fold test of their age of magnetization. However, before correcting for the tilt of the lavas, the dominant magnetization direction (D = 207.6°, I = 61.9°, k = 168, α95 = 3.7°) does not differ significantly from the uncorrected magnetization direction reported from the steeply dipping, northwest-facing units at Cape Smith (D = 218°, I = 60°, k = 47, α95 = 4°). This negative fold test suggests that the remanence at both locations was acquired after folding. Comparison with the North American Precambrian apparent polar wander path implies that overprinting is related to the Hudsonian Orogeny.A second stable magnetization directed to the west with a shallow inclination is superimposed on the dominant component at a number of sampling sites. Its direction is poorly defined and no fold test is possible. However, magnetic evidence suggests that this component was probably acquired as an overprint after the dominant magnetization, perhaps during a mild reheating associated with the Elsonian Orogeny.

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The Apparent Polar Wander Path For the North China Block Since the Jurassic

Geophysical Journal International ◽

10.1111/j.1365-246x.1991.tb02492.x ◽

1991 ◽

Vol 104 (1) ◽

pp. 29-40 ◽

Cited By ~ 57

Author(s):

Zhong Zheng ◽

Masaru Kono ◽

Hideo Tsunakawa ◽

Gaku Kimura ◽

Qingyun Wei ◽

...

Keyword(s):

North China ◽

North China Block ◽

Polar Wander ◽

The North ◽

Apparent Polar Wander Path

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Ancient mountain routes connecting central Anatolia to the upper Euphrates region

Anatolian Studies ◽

10.1017/s0066154600008486 ◽

2007 ◽

Vol 57 ◽

pp. 35-45 ◽

Cited By ~ 1

Author(s):

A. Tuba Ökse

Keyword(s):

Central Anatolia ◽

Eastern Anatolia ◽

North Central ◽

Field Surveys ◽

The Road ◽

The Third ◽

South Central ◽

Third Millennium ◽

Third Millennium Bc

AbstractField surveys carried out within the upper Kızılırmak region have shown that the natural route-ways passing through the area have connected central Anatolia to eastern Anatolia throughout the ages. The route from north-central Anatolia reaches the Kızılırmak river by passing through the plains of Çekerek, Yıldızeli and Yıldız. The Kızılırmak river can be crossed on horseback where the road ends. A second route connects south-central Anatolia to Sivas by passing through the plains of Gemerek and Şarkışla, and leads to eastern Anatolia by passing through the Kızılırmak valley after Sivas. A third route reaches Altınyayla by passing through the Kızılırmak valley, the Şarkışla plain and reaches the plain of Malatya by travelling through a pass of the Kulmaç mountains running along the Balıklıtohma valley. A fourth route connects Sivas with Malatya via Taşlıdere, Ulaş, Kangal and Alacahan. Fieldwork has shown that these routes have been almost continuously used since the middle of the third millennium BC.

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Paleomagnetism of the Lac St-Jean anorthosite and related rocks, Grenville Province, Quebec

Canadian Journal of Earth Sciences ◽

10.1139/e83-022 ◽

1983 ◽

Vol 20 (2) ◽

pp. 246-258 ◽

Cited By ~ 8

Author(s):

K. L. Buchan ◽

W. F. Fahrig ◽

G. N. Freda ◽

R. A. Frith

Keyword(s):

North American ◽

Regional Metamorphism ◽

The Other ◽

Central Portion ◽

Grenville Province ◽

Polar Wander ◽

Thermal Demagnetization ◽

The North ◽

Apparent Polar Wander Path ◽

Normal Polarity

Alternating field and thermal demagnetization study of the Lac St-Jean anorthosite and related rock units in the central portion of the exposed Grenville Province reveals two components of magnetization, one of reversed and the other of normal polarity. Both components are thought to have been acquired during the last regional metamorphism, which was sufficiently intense in this area (mostly amphibolite grade) to reset any earlier magnetization. Corresponding paleopoles at 193°W, 8°S (dm = 7.3°, dp = 4.6°) and 213°W, 19°S (dm = 10.5°, dp = 8.5°) lie along the 950–900 Ma segment of the recently calibrated Grenville track of the North American apparent polar wander path, a track that has thus far been defined largely by results from rock units of the western Grenville.

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