Geochemistry and tectonic setting of Tertiary volcanism in the Güvem area, Anatolia, Turkey

Tankut, Ayla; Wilson, Marjorie; Yihunie, Tadesse

doi:10.1016/s0377-0273(98)00060-2

Cited by 48 publications

(22 citation statements)

References 8 publications

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“…It is consistent with the earlier geochemical and tectonic models and suggests that the plagiogranites from the Eldivan Ophiolite are likely to have evolved in a suprasubduction zone environment (e.g. Tankut et al 1998;Dilek et al 2007;Dangerfield et al 2011;Çelik et al 2013). A recent study of Çelik et al 2013 proposed that the Eldivan Ophiolite makes the bridge between the discontinuous outcrops of Upper Jurassic Ophiolite of the Hellenide-Dinarides to the West and those of Armenia and Iran to the East.…”

Section: Discussionsupporting

confidence: 86%

Geochemistry and origin of plagiogranites from the Eldivan Ophiolite, Çankırı (Central Anatolia, Turkey)

Üner¹,

Çakir²,

Özdemir³

et al. 2014

Geologica Carpathica

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Abstract:The Eldivan Ophiolite, exposed around Ankara and Çanklrl cities, is located at the central part of the I · zmirAnkara-Erzincan Suture Zone (IAESZ). It represents fragments of the Neotethyan Oceanic Lithosphere emplaced towards the south over the Gondwanian continent during the Albian time. It forms nearly complete series by including tectonites (harzburgites and rare dunites), cumulates (dunites, wherlites, pyroxenites, gabbro and plagiogranites) and sheeted dykes from bottom to top. Imbricated slices of volcanic-sedimentary series and discontinuous tectonic slices of ophiolitic metamorphic rocks are located at the base of tectonites. Plagiogranitic rocks of the Eldivan Ophiolite are mainly exposed at upper levels of cumulates. They are in the form of conformable layers within layered diorites and also dikes with variable thicknesses. Plagiogranites have granular texture and are mainly composed of quartz and plagioclases. The occurrences of chlorite and epidote revealed that these rocks underwent a low grade metamorphism. Eldivan plagiogranites have high SiO 2 content (70-75 %) and low K 2 O content (0.5-1 %) and display flat patterns of REE with variable negative Eu anomalies. LREE/HREE ratio of these rocks varies between 0.2-0.99. All members of the Eldivan rocks have high LILE/HFSE ratios with depletion of Nb, Ti and P similar to subduction related tectonic settings. Geochemical modelling indicates that the Eldivan plagiogranites could have been generated by 50-90 % fractional crystallization and/or 5-25 % partial melting of a hydrous basaltic magma.

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Section: Discussionsupporting

confidence: 86%

Geochemistry and origin of plagiogranites from the Eldivan Ophiolite, Çankırı (Central Anatolia, Turkey)

Üner¹,

Çakir²,

Özdemir³

et al. 2014

Geologica Carpathica

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“…1A), which belongs to the Pontide Tectonic Belt (Toprak et al 1996, Wilson et al 1997, Tankut et al 1998). The GVP evolved as a consequence of the collision of the Afro-Arabian and Eurasian plates (Rögl 1998).…”

Section: Age and Geologic Settingmentioning

confidence: 99%

“…In general, Anatolia and the Lower Caucasus to the east still formed an island north of the East Mediterranean Basin and south of Eastern Paratethys. Deposition of the plant-bearing strata occurred during the major phase of volcanic activity in the Galatia Volcanic Province in the early Miocene (Tankut et al 1998). Hoek Ostende (2001 and de Bruijn et al (1996) stated that a humid biotope is indicated by the relatively high amount of insectivores in the fauna of Keseköy (27% of the total fauna).…”

Section: Palaeoenvironments Inferred From the Plant Assemblage Of Güvemmentioning

confidence: 99%

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The early Miocene flora of Güvem (Central Anatolia, Turkey): a window into early Neogene vegetation and environments in the Eastern Mediterranean

Denk¹,

Güner²,

Kvaček³

et al. 2017

Acta Palaeobotanica

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ABSTRACT. The early Burdigalian (MN3) plant assemblage of the Güvem area (northwestern Central Anatolia) is preserved in lacustrine sediments of the Dereköy pyroclastics. Its age is well constrained by radiometric dates of basaltic rocks bracketing the pyroclastics, making the Güvem flora one of the extremely few precisely dated early Miocene floras in the Mediterranean region. The rich assemblage of impression fossils comprises ferns and fern allies (2 species), gymnosperms (12 spp.) and angiosperms (129 spp.). Ilex miodipyrena sp. nov. is described as a new fossil-species. The most diverse families in the assemblage are the Fagaceae with 12 taxa and the Fabaceae with 12 leaf morphotypes and one fruit taxon. Aquatic plants are represented by seven taxa, riparian (including palms) and swamp forest elements by >35 taxa, and lianas by three taxa (Smilax spp., Chaneya). The relatively large number of aquatic and riparian/swamp elements is congruent with the rich fish, amphibian and reptile record of the Güvem area. Another characteristic feature of the plant assemblage is the presence of various lobed leaves which show similarities with modern species of different families (e.g. Alangium, various Malvales). Trees and shrubs growing on well-drained soils and forming closed-canopy and open-canopy forests are the most diversified group (>70 taxa). In terms of number of specimens in the collection and based on field observations, by far the most abundant leaf fossils belong to evergreen oaks of Quercus drymeja and Q. mediterranea and to various types of foliage that cannot be assigned to a particular extant or extinct genus of Fagaceae. These sclerophyllous trees must have covered vast areas surrounding the wetlands that developed during the early Miocene in the Güvem Basin. Based on a recent reassessment of the ecology and taxonomic affinity of these trees, they are considered to reflect humid temperate climatic conditions but with a brief drier season during the winter months. These forests are more similar to the laurel forests of the southeastern United States and those stretching in a narrow belt south of the Himalayas to eastern central China. The large number of Fabaceae may indicate the presence of warm subtropical environments but this is difficult to assess, as they are known for having wide ecological ranges today and in the past. All in all, a larger part of the plant taxa point to forested vegetation. This is in agreement with previous palynological studies which detected only small amounts of herbaceous and grass pollen. Open patches of vegetation may have been restricted to river banks and to rocky areas in a volcanic landscape. The biogeographic patterns detected for the early Miocene of the Güvem assemblage are manifold; most taxa are widespread Northern Hemispheric elements. A substantial part of the species migrated from Asia into Europe during the (late) Paleogene and reached Anatolia during the early Miocene (Fagus, Paliurus, Chaneya, Ailanthus, Quercus kubinyii, Davallia haidingeri, Acer angustilo...

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“…Volcanic rocks in the Eastern Sakarya Zone (ESZ) cover an area between the Galatian and Balkuyumcu provinces. The polyphase volcanic activity in the Galatian province was related to both pre-and post-collisional magmatic events and is reflected in calc-alkaline intermediate rocks and alkaline basalts (Wilson et al 1997;Tankut et al 1998;Bozkurt et al 1999;Koçyiğit et al 2003). The volcanic rocks in the Balkuyumcu region exhibit adakite-like character (rhyolite, dacite, and andesite) and developed during the Early Miocene after the collision of Pontides and the AnatolideTauride platform (Lünel 1987;Varol et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis of the post-collisional Eocene volcanic rocks from the Central Sakarya Zone (Northwestern Anatolia, Turkey): Implications for source characteristics, magma evolution, and tectonic setting

et al. 2015

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Eocene volcanic rocks from the Central Sakarya Zone in the north of the İzmir-Ankara suture zone (IASZ) are predominantly intermediate-acidic lava flows and pyroclastics that crop out with a W-E orientation. The volcanic rocks include Bozaniç lavas, agglomerates, İğdir lavas, and Kapıkaya tuffs. The Bozaniç lavas contain plagioclase, hornblende, clinopyroxene, and biotite, whereas the İğdir lavas consist of plagioclase, hornblende, biotite, and quartz. According to the total alkali-silica (TAS) diagram, the Bozaniç lavas are mainly composed of andesite and dacite, with one sample of trachyandesite, whereas the İğdir lavas mainly contain dacite and minor andesite. Bozaniç and İğdir lavas exhibit moderate-to high-K calc-alkaline character. Major oxide and trace element variations suggest the effects of fractional crystallization in the evolution of the volcanic rocks. N-type midocean ridge basalt (MORB) normalized trace element patterns of the lavas exhibit enrichment in large ion lithophile elements (LILEs; K, Rb, Ba, Th) and depletion in high field strength elements (HFSEs; Zr, Ti, Y). In addition, the chondritenormalized rare earth element (REE) plots of the rocks show moderately enriched and nearly concave-shaped patterns (La N /Yb N = 5.4-17.6 for the Bozaniç lavas and 6.5-13.1 for the İğdir lavas), suggesting clinopyroxene (Cpx) and hornblende dominated fractionation. Negative Eu anomalies in the acidic lavas reveal plagioclase fractionation. Some trace element ratios of the lavas demonstrate a subduction signature and crustal contamination in the generation of the parent magma(s). Multi-dimensional tectonic discrimination diagrams suggest that the studied volcanic rocks have developed in a collisional setting.

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Geochemistry and tectonic setting of Tertiary volcanism in the Güvem area, Anatolia, Turkey

Cited by 48 publications

References 8 publications

Geochemistry and origin of plagiogranites from the Eldivan Ophiolite, Çankırı (Central Anatolia, Turkey)

Geochemistry and origin of plagiogranites from the Eldivan Ophiolite, Çankırı (Central Anatolia, Turkey)

The early Miocene flora of Güvem (Central Anatolia, Turkey): a window into early Neogene vegetation and environments in the Eastern Mediterranean

Petrogenesis of the post-collisional Eocene volcanic rocks from the Central Sakarya Zone (Northwestern Anatolia, Turkey): Implications for source characteristics, magma evolution, and tectonic setting

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