Formation and emplacement ages of the SSZ-type Neotethyan ophiolites in Central Anatolia, Turkey: palaeotectonic implications

Yalınız, M. Kenan; Lü, Menghong; zkan-Altiner, Sev n

doi:10.1002/1099-1034(200004/06)35:2<53::aid-gj837>3.0.co;2-6

Cited by 59 publications

(35 citation statements)

References 14 publications

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“…The ATB is characterized by a Neoproterozoic‐Cambrian crystalline basement overlain by thick Paleozoic‐early Cenozoic carbonate‐dominated successions (e.g., Okay, ; Robertson et al, ); the terms Anatolide and Tauride refer to the metamorphic and nonmetamorphic domains, respectively. Based on its similar Paleozoic‐Mesozoic stratigraphy and history of metamorphism, the Kırşehir Block is regarded either as the metamorphosed northern margin of the ATB (Poisson et al, ; Şengör & Yılmaz, ; Yalınız et al, ) or more controversially as a distinct terrane separated from the ATB by the Inner Tauride suture (e.g., Görür et al, ; Parlak et al, ). Recent work also demonstrates that eastern Anatolia is underlain by a continental basement with a similar lithology and age to that of the ATB to the west (Topuz et al, ; Yılmaz et al, ).…”

Section: Geologic Backgroundmentioning

confidence: 99%

Rapid Late Eocene Exhumation of the Sivas Basin (Central Anatolia) Driven by Initial Arabia‐Eurasia Collision

2018

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Continental collisions exert a profound influence on the configuration and evolution of orogenic systems. The effects of Arabia-Eurasia collision on the geodynamics of the eastern Mediterranean are difficult to unravel, however, because the timing of initial collision (i.e., intercontinental contact) remains controversial. We present the first detrital and bedrock apatite fission track and (U-Th-Sm)/He thermochronology, and detrital zircon U-Pb constraints from the Sivas Basin and eastern Taurides in central Anatolia (Turkey), which provide a detailed record of Cenozoic orogenesis in the hinterland of the Arabia-Eurasia collision zone. Our results indicate rapid middle Eocene burial followed by shortening, rapid cooling (up to~25-45°C/myr), and initiation of the southern Sivas fold-thrust belt (SSFTB) during the late Eocene (~40-34 Ma), consistent with evidence of a coeval basin-wide unconformity. We interpret that rapid late Eocene cooling of the SSFTB reflects exhumation driven by the northward propagation of retroforeland contraction into the Sivas Basin from the middle to late Eocene, and we propose that these events were due to initial soft collision of the thinned Arabian passive margin by~45 Ma. This timing of the inception of collision is supported by a regional compilation of apatite fission track data that indicates rapid cooling and hinterland exhumation throughout central and eastern Anatolia from~45 to 20 Ma, which was synchronous with a widespread magmatic lull from~40 to 20 Ma. The data presented here are compatible with a widely accepted transition to more mature or hard collision at~20 Ma, probably related to the arrival of thick Arabian crust along the Bitlis suture zone. Plain Language SummaryThe continents of Arabia and Eurasia (Europe and Asia) comprise two separate tectonic plates that are currently colliding with each other. We are uncertain when collision started, which makes it difficult to understand how the collision may have triggered other tectonic changes throughout the region. We investigated the onset of collision by collecting rock samples near the boundary between these continents in central Turkey and determining how their temperature has changed through time (thermochronology). Our analyses tell us the rocks cooled down very quickly~40 million years ago, from temperatures greater than~120°C (i.e., several kilometers deep in the Earth) to much lower temperatures similar to Earth's surface. We infer that rapid cooling was due to the onset of tectonic activity and the creation of a mountain chain with high rates of erosion that removed overlying rocks to bring these samples closer to Earth's surface. These new results agree well with several similar studies that show that rock cooling also occurred at the same time throughout the entire region. We conclude that rock cooling was caused by tectonic uplift and erosion triggered by initial collision of the thinned front of the Arabia plate with Turkeỹ 45 million years ago.

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Section: Geologic Backgroundmentioning

confidence: 99%

Rapid Late Eocene Exhumation of the Sivas Basin (Central Anatolia) Driven by Initial Arabia‐Eurasia Collision

2018

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“…These metamorphic soles are generally interpreted as marking the initiation of intra-oceanic subduction, although the associated intra-oceanic arcs are generally not recognized. Despite the well-described exposures of Tethyan supra-subduction ophiolites found as obducted on Gondwana-derived continental fragments (Çakır, 2009;Dilek et al, 1999;Hässig et al, 2013aHässig et al, , 2013bHébert et al, 2012;Malpas et al, 2003;Önen, 2003;Robertson, 2002;Searle and Cox, 1999;Thuizat et al, 1981;Yalınız et al, 1996Yalınız et al, , 2000aYalınız et al, , 2000b, presumed intra-oceanic arcs are generally not well defined within the Alpine-Himalayan range with an exception of the well-known Cretaceous Kohistan Arc exposed in http://dx.doi.org/10.1016/j.jseaes.2015.07.005 1367-9120/Ó 2015 Elsevier Ltd. All rights reserved. the north of Pakistan (Coward et al, 1987;Petterson, 2010;Schaltegger et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Late Cretaceous infant intra-oceanic arc volcanism, the Central Pontides, Turkey: Petrogenetic and tectonic implications

Aygül

Okay

Oberhänsli

et al. 2015

Journal of Asian Earth Sciences

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“…Today, the Tavşanlı Zone comprises, from highest to lowest structural levels, Eocene and Neogene siliciclastic and volcanic rocks of the peripheral Eskişehir foreland basin, obducted Cretaceous ophiolites of the İAESZ, metamorphosed Paleozoic basement, and Late Cretaceous and Eocene‐early Oligocene granitoids intruded into the ophiolites and basement (Harris et al, ; Okay et al, ; Okay & Whitney, ; Şengüler & Izladi, ; Sherlock et al, ). The HT/LP Kırşehir Block in central Anatolia (also known as the Kırşehir Massif or Central Anatolian Crystalline Complex) is arguably either a distinct terrane (e.g., Görür et al, ) or the lateral continuation of the Tavşanlı Zone (van Hinsbergen et al, ; Plunder et al, ; Yaliniz et al, ).…”

Section: Geological Contextmentioning

confidence: 99%

“…(1) In the diachronous promontory collision model, the KB was a promontory of the ATB. Initial collision of the apex of the KB in the latest Cretaceous preceded collision in western and eastern Anatolia (Figure a; Floyd et al, ; Kaymakci et al, ; Meijers et al, ; Yaliniz et al, ). Ophiolitic belts at the southern KB were from foreland‐propagating thrust nappes from the İAESZ not an Intra‐Tauride Suture Zone.…”

Section: Geological Contextmentioning

confidence: 99%

Collision Chronology Along the İzmir‐Ankara‐Erzincan Suture Zone: Insights From the Sarıcakaya Basin, Western Anatolia

et al. 2019

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Debate persists concerning the timing and geodynamics of intercontinental collision, style of syncollisional deformation, and development of topography and fold-and-thrust belts along the >1,700-km-long İzmir-Ankara-Erzincan suture zone (İAESZ) in Turkey. Resolving this debate is a necessary precursor to evaluating the integrity of convergent margin models and kinematic, topographic, and biogeographic reconstructions of the Mediterranean domain. Geodynamic models argue either for a synchronous or diachronous collision during either the Late Cretaceous and/or Eocene, followed by Eocene slab breakoff and postcollisional magmatism. We investigate the collision chronology in western Anatolia as recorded in the sedimentary archives of the 90-km-long Sarıcakaya Basin perched at shallow structural levels along the İAESZ. Based on new zircon U-Pb geochronology and depositional environment and sedimentary provenance results, we demonstrate that the Sarıcakaya Basin is an Eocene sedimentary basin with sediment sourced from both the İAESZ and Söğüt Thrust fault to the south and north, respectively, and formed primarily by flexural loading from north-south shortening along the syncollisional Söğüt Thrust. Our results refine the timing of collision between the Anatolides and Pontide terranes in western Anatolia to Maastrichtian-Middle Paleocene and Early Eocene crustal shortening and basin formation. Furthermore, we demonstrate contemporaneous collision, deformation, and magmatism across the İAESZ, supporting synchronous collision models. We show that regional postcollisional magmatism can be explained by renewed underthrusting instead of slab breakoff. This new İAESZ chronology provides additional constraints for kinematic, geodynamic, and biogeographic reconstructions of the Mediterranean domain.

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Formation and emplacement ages of the SSZ-type Neotethyan ophiolites in Central Anatolia, Turkey: palaeotectonic implications

Cited by 59 publications

References 14 publications

Rapid Late Eocene Exhumation of the Sivas Basin (Central Anatolia) Driven by Initial Arabia‐Eurasia Collision

Rapid Late Eocene Exhumation of the Sivas Basin (Central Anatolia) Driven by Initial Arabia‐Eurasia Collision

Late Cretaceous infant intra-oceanic arc volcanism, the Central Pontides, Turkey: Petrogenetic and tectonic implications

Collision Chronology Along the İzmir‐Ankara‐Erzincan Suture Zone: Insights From the Sarıcakaya Basin, Western Anatolia

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