Middle Triassic back-arc basalts from the blocks in the Mersin Mélange, southern Turkey: Implications for the geodynamic evolution of the Northern Neotethys

Sayıt, Kaan; Bedi, Yavuz; Tekin, U. Kagan; Göncüoğlu, M. Cemal; Okuyucu, Cengız

doi:10.1016/j.lithos.2016.10.032

Cited by 37 publications

(19 citation statements)

References 54 publications

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“…As mentioned above the Mersin Mélange contains the fragments transported from the IAE Ocean (Beyşehir–Hoyran nappes sensu Brunn et al, , ) according to Tekin et al (Tekin, Bedi, Okuyucu, Göncüoglu, & Sayit, ; Tekin, Bedi, Okuyucu, Göncüoglu, Sayit et al, ). Therefore, if Anisian lavas indeed represent an oceanic back‐arc basin as suggested by Sayit et al (), then some older (pre‐Anisian) continental/oceanic fragments should exist within the Mersin Mélange or any other part that preserves the remnants of the IAE Ocean.…”

Section: Discussionmentioning

confidence: 83%

“…Moix et al, ) in an olistostromal matrix. By this evidence, Tekin, Bedi, Okuyucu, Göncüoglu, and Sayit (), Tekin, Bedi, Okuyucu, Göncüoglu, Sayit et al () and Sayit et al () ascribed the formation to a sedimentary mélange. The present relationship between the larger blocks and the matrix, on the other hand, appears to be sheared.…”

Section: Geological Frameworkmentioning

confidence: 80%

“…Subduction‐related characteristics were also found in the Triassic, which make the picture even more interesting. In the Lycian Nappes, arc‐type basalts were found associated with Carnian chert (Sayit et al, ), while oceanic back‐arc basin characteristics were found in the basalts associated with Anisian chert (Sayit et al, ). Therefore, such data indicate the existence of a mature IAE ocean even during the Middle Triassic.…”

Section: Discussionmentioning

confidence: 99%

“…The Mersin Ophiolitic Complex (Moix et al, ; Moix, Kozur, Stampfli, & Mostler, ; Pampal, ; Parlak & Robertson, ) comprises two units; the Mersin Mélange (MM) and the Mersin Ophiolite with its sub‐ophiolitic metamorphic sole in southern Turkey (Figure b). According to Tekin, Bedi, Okuyucu, Göncüoglu, and Sayit (), Tekin, Bedi, Okuyucu, Göncüoglu, and Sayit et al (), and Sayit, Bedi, Tekin, Göncüoglu, and Okuyucu (), the Mersin Mélange is of sedimentary origin and contains mainly remnants of the Beysehir–Hoyran nappes sensu Brunn et al (, ) that originated from the IAE Ocean of the Neotethys (equals ‘Bozkir Unit’ by Özgül, , , ). Previously detailed studies performed on the Mersin Mélange revealed that it includes blocks/tectonic slices of Early Carboniferous to early Late Cretaceous ages (Moix et al, , ; Tekin, Bedi, Okuyucu, Göncüoglu, Sayit, et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Tekin, Bedi, Okuyucu, Göncüoglu and Sayit (2016) report the presence of blocks and tectonic slices of thick basaltic pillow and massive lava sequences of pre‐late Anisian age and overlying pelagic‐clastic sediment and radiolarian chert of middle to late Late Anisian age. A detailed geochemical study of the underlying pillow and massive lava sequences suggests that they were generated at an intra‐oceanic back‐arc basin (Sayit et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Integrated Radiolaria, benthic foraminifera and conodont biochronology of the pelagic Permian blocks/tectonic slices and geochemistry of associated volcanic rocks from the Mersin Mélange, southern Turkey: Implications for the Permian evolution of the northern Neotethys

et al. 2018

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Blocks and tectonic slices within the Mersin Mélange (southern Turkey), which are of Northern Neotethyan origin (Izmir–Ankara–Erzincan Ocean (IAE)), were studied in detail by using radiolarian, conodont, and foraminiferal assemblages on six different stratigraphic sections with well‐preserved Permian succesions. The basal part of the Permian sequence, composed of alternating chert and mudstone with basic volcanics, is assigned to the late Asselian (Early Permian) based on radiolarians. The next basaltic interval in the sequence is dated as Kungurian. The highly alkaline basic volcanics in the sequence are extremely enriched, similar to kimberlitic/lamprophyric magmas generated at continental intraplate settings. Trace element systematics suggest that these lavas were generated in a continental margin involving a metasomatized subcontinental lithospheric mantle source (SCLM). The middle part of the Permian sequences, dated by benthic foraminifera and conodont assemblages, includes detrital limestones with chert interlayers and neptunian dykes of middle Wordian to earliest Wuchiapingian age. Higher in the sequence, detrital limestones are overlain by alternating chert and mudstone with intermittent microbrecciated beds of early Wuchiapingian to middle Changhsingian (Late Permian) age based on the radiolarians. A large negative shift at the base of the Lopingian at the upper part of section is correlated to negative shifts at the Guadalupian/Lopingian boundary associated with the end‐Guadalupian mass extinction event. All these findings indicate that a continental rift system associated with a possible mantle plume existed during the late Early to Late Permian period. This event was responsible for the rupturing of the northern Gondwanan margin related to the opening of the IAE Ocean. When the deep basinal features of the Early Permian volcano‐sedimentary sequence are considered, the proto IAE oceanic crust formed possibly before the end of the Permian. This, in turn, suggests that the opening of the IAE Ocean dates back to as early as the Permian.

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Section: Discussionmentioning

confidence: 83%

Section: Geological Frameworkmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%