Tectonic significance of the geochemistry and petrology of ophiolites in southeast Anatolia, Turkey

Parlak, Osman; Rızaoğlu, Tamer; Bağci, Utku; Karaoğlan, Fatih; Höck, Volker

doi:10.1016/j.tecto.2008.08.002

Cited by 121 publications

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“…These are, from north to south, the Intra-Pontide Ocean, the İzmir-Ankara-Erzincan Ocean (northern Neotethys), the Inner Tauride Ocean, the southern Neotethys and the Berit Ocean (Robertson et al, 2012(Robertson et al, , 2006Parlak et al, 2009;Okay and Tüysüz, 1999;Görür et al, 1984;Robertson and Dixon, 1984;Şengör and Yılmaz, 1981). With the exception of the Intra-Pontide Ocean, a widely accepted scenario for the evolution of the oceanic basins is: (a) Triassic rifting, (b) Jurassic-Early Cretaceous passive margin subsidence, (c) Late Cretaceous intraoceanic convergence/metamorphic sole formation/ supra-subduction zone ophiolite genesis and (d) latest Cretaceous emplacement onto continental margins.…”

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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“…Isolated dikes cut through the aforementioned rocks at different structural levels. Mantle tectonites are more than 4 km thick and form at least 60 % of the whole ophiolite body [28,29]. The Guleman Ophiolite contains serpentinized peridotite grading upward through a transition zone of alternating peridotite-pyroxenite with increasing amounts of gabbro into banded gabbro [30].…”

Section: Discussionmentioning

confidence: 99%

High-risk mesothelioma relation to meteorological and geological condition and distance from naturally occurring asbestos

Abakay

Tanrıkulu

Ayhan

et al. 2015

Environ Health Prev Med

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Objectives Very few studies have investigated the incidence and risk of malignant mesothelioma (MM) associated with distinct sources of asbestos exposure, especially exposure to naturally occurring asbestos (NOA). Methods Subjects were MM, lung, and breast cancer patients who were diagnosed and followed in Diyarbakir Province between 2008 and 2013. The birthplaces of patients were displayed on a geologic map. Geological and meteorological effects on MM were analyzed by logistic regression. Results A total of 180 MM, 368 breast, and 406 lung cancer patients were included. The median distance from birthplace to ophiolites was 6.26 km for MM, 31.06 km for lung, and 34.31 km for breast cancer (p \ 0.001). The majority of MM cases were seen within 20 km from NOA areas. The MM incidence inside of NOA was 1059/100.000, and out of NOA was 397/100.000; this difference was significant (p = 0.014). The largest concentration of MM residential areas was within ±30°(34 residential areas 36.6 %) of the dominant wind direction. Most MM patients were found in or near the dominant wind direction, especially in the acute angle defined by the dominant wind direction. MM incidence was directly proportional to {[area of NOA (km 2 )] * [cosine a of wind direction angle]} and was inversely proportional to the square of the distance (R = 0.291, p = 0.023).Conclusions MM was higher near NOA and in the downwind direction. MM incidence and risk were affected by geological and meteorological factors.

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“…In two subductional models, one of the subduction submerges beneath the Keban platform and forms Baskil magmatics, and the another subduction has occurred within the ocean and formed supra subduction zone ophiolites (İspendere, Guleman, Kömürhan) (Robertson, 2000). A third model is suggested as multi staged subduction (Robertson et al, 2007;Parlak et al, 2009). Another problem to be solved is the beginning period of the Figure 51-Hypothetically geological evolution model of basement models from Middle?-Late Triassic to late Maastrichtian (modified from Yazgan and Chessex, 1991;Bingöl and Beyarslan, 1996;Herece, 2008).…”

Section: Resultsmentioning

confidence: 99%

Upper Cretaceous-Tertiary Geology/Stratigraphy of Pertek and Its Vicinity (Tunceli̇, Turkey)

Herece¹,

Acar²

2016

Bulletin of the Mineral Research and Exploration

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The basement units of the study area are Paleozoic-Mesozoic Keban metamorphics and Late Cretaceous Elazığ magmatics. As a result of tectonic events caused by final collision in Middle Maastrichtian, all these basement units were juxtaposed, uplifted, eroded and acted as a source area for the Maastrichtian-Paleogene basins. Upper Cretaceous-Paleogene deposits were systematically sampled in order to determine their ages and lithologies. Due to new age findings and stratigraphical positions the marine units were identified as; Harami, Seske and Kırkgeçit formations. Late Oligocene-Early Miocene Alibonca formation and Pliocene Karabakır formation are the other units of the study area. Maastrichtian-Thanetian Harami formation is formed by grainstone intercalated with sandstone at the bottom and white limestone at the top. Early Lutetian Seske formation consists of conglomerate at the bottom and much nummulitic, carbonate cemented sandstone with ophiolitic fragments at the top. Kırkgeçit formation consists of sandstone-siltstone-limestone intercalation, and it is early Bartonian-early Chattian. Late Chattian-middle Burdigalian Alibonca formation consists of conglomerate at the bottom, reefal limestone in the middle and clayey limestone intercalated with algal limestone at the top. Pliocene Karabakır formation is formed by conglomerate-mudstone and locally by intercalations of pyroclastics and lavas. Pertek Andesite and Basalt Members are both vertically and laterally transitional with sedimentary lithologies of the Karabakır formation. There is no data to date the lithology; however, it was assumed that it had been Pliocene in age according to the lithostratigraphical succession. In the study area, macrotectonic events were experienced in Late Cretaceous, Early Eocene, middle-late Lutetian, Middle?-Late Miocene and in the Latest Pliocene. During the last tectonic phase, the Anatolian plate bounded by the East Anatolian Fault (EAF) in E-SE began to move westward, and the right lateral strike slip Pertek Fault activated in the study area.

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Tectonic significance of the geochemistry and petrology of ophiolites in southeast Anatolia, Turkey

Cited by 121 publications

References 62 publications

The tauride ophiolites of Anatolia (Turkey): A review

The tauride ophiolites of Anatolia (Turkey): A review

High-risk mesothelioma relation to meteorological and geological condition and distance from naturally occurring asbestos

Upper Cretaceous-Tertiary Geology/Stratigraphy of Pertek and Its Vicinity (Tunceli̇, Turkey)

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