Age of radiolarian‐chert blocks from the Senonian Ophiolitic Mélange (Ankara, Turkey)

Bragin, N. Yu.; Tekin, U. Kagan

doi:10.1111/j.1440-1738.1996.tb00018.x

Cited by 65 publications

(45 citation statements)

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“…Geochemistry of volcanic rocks within the mélange indicates the presence of different magma types such as ocean island basalts (OIB), mid-ocean ridge basalts (MORB) and island arc basalts (IAB) (Parlak and Robertson, 2004;Andrew and Robertson, 2002;Robertson, 1998, 1997). Radiolarian cherts within the mélange units have yielded Late Triassic, Jurassic, Early Cretaceous and Late Cretaceous ages (Göncüoğlu et al, 2006;Parlak and Robertson, 2004;Tekin et al, 2002;Bragin and Tekin, 1996). The ophiolitic mélanges formed as oceanic accretionary complexes ahead of an advancing suprasubduction oceanic slab during the Late Cretaceous.…”

Section: Discussionmentioning

confidence: 99%

The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

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The Tauride ophiolites lie on the northern and southern flanks of an E-W-trending Tauride carbonate platform. They mainly consist of three tectonic units namely in ascending order, ophiolitic mélange, sub-ophiolitic metamorphic sole and oceanic lithospheric remnants. They were generated above intra-oceanic subduction zones and emplaced over the Tauride carbonate platform from different Neotethyan oceanic basins in the Late Cretaceous. Tauride ophiolites from west to east are described and reviewed. All are underlain by well-preserved dynamothermal metamorphic soles of varied structural thicknesses up to 500 m that have a constant structural position between ophiolitic mélange below and harzburgitic mantle tectonites above and display typical inverted metamorphic sequences from amphibolite facies above to greenschist facies below. The metamorphic soles are shown to have evolved during the initiation of subduction and emplacement processes. In the Pozantı-Karsantı area the contact between the metamorphic sole and the overlying serpentinized harzburgites is characterized by a 1.5-2-m-thick zone of sheared serpentinized harzburgitic mantle intercalated with amphibolites and cut by thick mafic dykes (7-8 m) which postdate intraoceanic metamorphism and high-temperature ductile deformation. This contact is interpreted as an intra-oceanic decoupling surface along which volcanics from the upper levels of the down-going plate were metamorphosed to amphibolite facies and accreted to the base of the hanging wall plate. The metamorphic soles and overlying ophiolitic rocks were intruded by numerous isolated post-metamorphic diabase dykes filled by island arc tholeiitic magma. Subduction initiation and roll-back processes best explain the structural and petrological relationships of Late Cretaceous ophiolite genesis, metamorphic sole formation and subsequent dyke emplacement of the Tauride ophiolites. KEY WORDS: ophiolite, metamorphic sole, dyke emplacement, roll-back, subduction initiation. INTRODUCTIONThe Tauride orogenic belts of Turkey are interpreted as representing a continental fragment that rifted from Gondwana (North Africa) during the Triassic, followed by reamalgamation and continental collision during the OligoMiocene (Karaoğlan et al., 2016) or Miocene (Okay et al., 2010). The Taurides are traditionally divided into three contiguous parts; the western, central and eastern Taurides (Özgül, 1976).Ophiolites along the Tauride belt start with the Lycian nappes to the west and end with the Divriği ophiolite to the east (Fig. 1). These ophiolites (the Lycian nappes, Antalya, Beyşehir-Hoyran nappes, Mersin, Alihoca, Pozantı-Karsantı, Pınarbaşı and Divriği) are situated either on the northern or on the southern flank of an approximately E-W trending Tauride carbonate platform axis (Juteau, 1980 (Juteau, 1980). The plutonic sections and the metamorphic soles of the Tauride ophiolites are cut by numerous isolated microgabbro-diabase and minor pyroxenite dykes at different structural levels (Robertson et al

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Section: Discussionmentioning

confidence: 99%

The tauride ophiolites of Anatolia (Turkey): A review

Parlak¹

2016

J. Earth Sci.

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“…This assemblage is younger. Betraccium inornatum Blome is known from the Upper Norian of Oregon (Blome 1983), from the Rhaetian of Turkey (Tekin 1999), and from the Upper Norian of the New Siberian Islands (Russia, Arctic) (Bragin 2011), while Tetraporobrachia composita Carter was reported from the Rhaetian of British Columbia (Carter 1993) and from the Upper Norian of Turkey (Bragin & Tekin 1996) and Greece ( Bragin et al 2014). Therefore this assemblage can be dated as Upper Norian-Rhaetian.…”

Section: Samples Scg 48a and Bmentioning

confidence: 99%

“…S. ellisensis (Carter). Ferresium triquetrum is present in the Rhaetian of British Columbia (Carter 1993) and from the Upper Norian of Turkey (Bragin & Tekin 1996). Serilla ellisensis is known from the Rhaetian of British Columbia (Carter 1993), while Braginella rudis was reported from the Upper Norian of Far East Russia (Bragin 1991), Japan (Sugiyama 1997) and Greece (Bragin et al 2014).…”

Section: Sample Srb 207mentioning

confidence: 99%

Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

Gawlick¹,

Djerić²,

Missoni³

et al. 2017

Geologica Carpathica

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Oceanic radiolarite components from the Middle Jurassic ophiolitic mélange between Trnava and Rožanstvo in the Zlatibor Mountains (Dinaridic Ophiolite Belt) west of the Drina-Ivanjica unit yield Late Triassic radiolarian ages. The microfacies characteristics of the radiolarites show pure ribbon radiolarites without crinoids or thin-shelled bivalves. Beside their age and the preservation of the radiolarians this points to a deposition of the radiolarites on top of the oceanic crust of the Neo-Tethys, which started to open in the Late Anisian. South of the study area the ophiolitic mélange (Gostilje-Ljubiš-Visoka-Radoševo mélange) contains a mixture of blocks of 1) oceanic crust, 2) Middle and Upper Triassic ribbon radiolarites, and 3) open marine limestones from the continental slope. On the basis of this composition we can conclude that the Upper Triassic radiolarite clasts derive either from 1) the younger parts of the sedimentary succession above the oceanic crust near the continental slope or, more convincingly 2) the sedimentary cover of ophiolites in a higher nappe position, because Upper Triassic ribbon radiolarites are only expected in more distal oceanic areas. The ophiolitic mélange in the study area overlies different carbonate blocks of an underlying carbonate-clastic mélange (Sirogojno mélange). We date and describe three localities with different Upper Triassic radiolarite clasts in a mélange, which occurs A) on top of Upper Triassic fore-reef to reefal limestones (Dachstein reef), B) between an Upper Triassic reefal limestone block and a Lower Carnian reef limestone (Wetterstein reef), and C) in fissures of an Upper Triassic lagoonal to back-reef limestone (Dachstein lagoon). The sedimentary features point to a sedimentary and not to a tectonic emplacement of the ophiolitic mélange (= sedimentary mélange) filling the rough topography of the topmost carbonate-clastic mélange below. The block spectrum of the underlying and slightly older carbonate-clastic mélange points to a deposition of the sedimentary ophiolitic mélange east of or on top of the Drina-Ivanjica unit.

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“…Tekin and Göncüoğlu (2007) and Tekin and Göncüoğlu (2008); (4) Tekin and Göncüoğlu (2009); (5) ; (6) Göncüoğlu et al (2000); (7) Göncüoğlu et al (2006b); (8) Yalınız et al (in prep. ) in Göncüoğlu et al (2006b); (9) Göncüoğlu et al (2006a), Göncüoğlu et al (2010) and Tekin et al (2002); (10) Servais (1982); (11) Bragin and Tekin (1996); (12) Rojay et al (2004); (13) Çelik (2010) and Üner (2010) in Tekin, Çelik et al (2012); (14) Tüysüz and Tekin (2007); (15) Boccaletti et al (1966); (16) Bozkurt et al (1997). The map is modified after Moix et al (2008).…”

Section: Age and Type Of Blocksmentioning

confidence: 99%

“…Ages ranging from the Late Triassic to the Late Cretaceous have been documented over the last fifteen-twenty years. The first datings were obtained by Bragin and Tekin (1996), near Ankara, in isolated chert and mudstone blocks, which yielded late Norian, Early Jurassic, KimmeridgianTithonian, Early Cretaceous and late Albian-Turonian radiolarian assemblages. Until now, this is the most complete radiolarian study done along the İzmir-Ankara suture zone (Figure 3, no.…”

Section: Ankara Mélangesmentioning

confidence: 99%