The petrology of the Ortakoy district and its ophiolite at the western edge of the Middle anatolian Massif, Turkey

Koçak, Kerim; Leake, Bernard Elgey

doi:10.1016/0899-5362(94)90028-0

Cited by 28 publications

(21 citation statements)

References 21 publications

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“…1b). Both granitoids are considered to be cogenetic with similar granitoids from Central Anatolia Kuscu et al 2001), whose tectonic settings are suggested as collisional/post-collisional (Goncuoglu and Tureli 1994;Akiman et al 1993;Erler and Goncuoglu 1996;Boztug 1998Boztug , 2000Aydin et al 1998;Yaliniz et al 1999) and/or magmatic arc (Gorur et al 1984;Kocak 1993;Kocak and Leake 1994;Kadioglu and Gulec 1996).…”

Section: Geological Setting and Field Characteristicsmentioning

confidence: 95%

Hybridization of mafic microgranular enclaves: mineral and whole-rock chemistry evidence from the Karamadazı Granitoid, Central Turkey

Koçak

2006

Int J Earth Sci (Geol Rundsch)

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On the Eastern Tauride Belt, the Cretaceous calc-alkaline Karamadazı Granitoid consists of quartz diorite containing mafic microgranular enclaves (MME) and leucocratic granite. The quartz diorite consists of plagioclase (An 8-65 ), hornblende, biotite, Kfeldspar, quartz, epidote and titanite. Subrounded MME in the quartz diorite are holocrystalline, finegrained, quartz diorite to diorite in composition, and display a similar mineral assemblage to their host. Large crystals in MME and quartz diorite show various disequilibrium microstructures indicative of hybridization. Plagioclase crystals exhibit inverse, normal, and oscillatory zoning with maximum core-to-rim An content increase up to 38% in the enclave and 40% in the quartz diorite. Both hornblende and augite exhibit normal and reverse zoning even in the same sample. The new field, textural, mineral compositional, and geochemical evidence leads to the conclusion that MME could have formed through injection of successive pulses of basic magma into upward mobile magma chambers containing cooler, partially crystalline quartz diorite magma. The quartz diorites show similarity to high-Al TTG (tonalites-trondhjemites-granodiorites), with their high Na 2 O, Sr, LREE, and low Mg#, Cr, HREE contents, and are suggested to be produced by extensive interaction between the crustal and mantlederived melts through mixing at depth. In contrast, leucogranites have geochemical characteristics distinct from the quartz diorites and MME, and are probably not involved in MME genesis.

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Section: Geological Setting and Field Characteristicsmentioning

confidence: 95%

Hybridization of mafic microgranular enclaves: mineral and whole-rock chemistry evidence from the Karamadazı Granitoid, Central Turkey

Koçak

2006

Int J Earth Sci (Geol Rundsch)

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“…Metapelitic rocks in the Nigde Massif record two metamorphic events: an early, regional medium-pressure, high-temperature event associated with burial and heating during collision between the Tauride and Anatolide blocks (in Early Cenozoic), and a later low-pressure, hightemperature event likely related to shallow intrusion of the Uckapılı granite Dilek, 1998, 2000;Whitney et al, 2003 Atabey, 1989a, b;Atabey et al, 1990;Kocak, 1993;Kocak and Leake, 1994). AB: Akdag Block, KB: Kırsehir Block, AsB: Aksaray Block, NB: Nigde Block. conditions are 5-6 kbar at >700°C.…”

Section: Geological Settingmentioning

confidence: 99%

“…4a and b) also support an igneous origin (Table 3). Similarly, amphibolites from the Aksaray Block were also suggested to be derived from an igneous protolith on the basis of geochemical data and preserved volcanic microstructure (Kocak, 1993(Kocak, , 2002Kocak and Leake, 1994).…”

Section: Geochemistrymentioning

confidence: 99%

“…However, Ozgul (1976) suggested that the Devonian-Late Cretaceous-aged Bolkardagı Unit might correspond to the cover formation of the Nigde Massif. In addition, based on their fossil content, the precursor ages for lower part of the complex were suggested to range from Silurian to Devonian in Ortakoy Block (Kocak, 1993(Kocak, , 2000Kocak and Leake, 1994). The Kaleboynu Formation therefore should be Upper Paleozoic in age, and the development of the Gumusler and Kaleboynu amphibolites should have been associated with the evolution of the Palaeotethys ocean, which was opened as a back-arc basin due to slab rollback of the Rheic and Asiatic oceans (von Raumer et al, 2002;Stampfli et al, 2002), and closed finally in Turkey during the Cimmerian orogenic cycle (Eren et al, 2004).…”

Section: Typical N-morb Is From the Pacific Ocean E-morb N-morb mentioning

confidence: 99%

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Characteristics of the amphibolites from Nigde metamorphics (Central Turkey), deduced from whole rock and mineral chemistry

Koçak¹,

Kurt²,

Zedef³

et al. 2007

Geochem. J.

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Whole rock and mineral chemistry of amphibolites are presented for the lower (Gumusler Formation) and higher parts (Kaleboynu Formation) of the Nigde Massif with the aim to constrain protolith genesis and metamorphic P-T-conditions. The amphibolites, associated with a series of supracrustal metasediments, as thin layers and discontinuous pod/small lenses, are of igneous origin with composition of subalkaline and tholeiitic basalts. Based on immobile elements content and ratios, amphibolites from both formations are thought to have formed mostly by fractional crystallisation of pyroxene ± spinel, amphibole, plagioclase as well as apatite and titanite; coupled with minor crustal contamination. Contamination is particularly clear for the Gumusler Formation formed in a back-arc basin (Paleothetys) during magmatic ascent through the thickened Central Anatolian crust. The basic rocks could have been metamorphosed later at 7.5-3 ± 0.6 kb and 850-420°C, with the temperature gradient ranging from 35 to 122°C/km at different depths in the Neo-Tethyan subduction zone, and exhumed from depths of approximately 20 km via regional extension.

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“…The Late Mesozoic-Early Cenozoic evolution of the CACC involves episodes of obduction of Tethyan ophiolites, deformation, metamorphism, and magmatism associated with contraction and collision along its boundaries (Göncüoğlu et al, 1991;Koçak and Leake, 1994;Yalınız et al, 1996Yalınız et al, , 1999Yalınız et al, , 2000aYalınız et al, , 2000bKocak et al, 2005;Kadıoğlu et al, 2006;Özdamar et al, 2012;Özdamar et al, 2013;Pourteau et al, 2013). Discontinuous exposures of the Tethyan ophiolites define 2 major suture zones surrounding the CACC, the IAESZ in the north and the ITSZ in the south (Şengör and Yılmaz, 1981;Robertson and Dixon, 1984;Dilek and Moores, 1990;Dilek et al, 1999;Kadıoğlu et al, 2006;Toksoy-Köksal et al, 2009;Lefebvre et al, 2013).…”

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confidence: 99%

Geological, petrological, and geodynamical characteristics of the Karacaali Magmatic Complex (Kırıkkale) in the Central Anatolian Crystalline Complex, Turkey

Elitok¹,

Özdamar²,

Bacak³

et al. 2014

Turkish J Earth Sci

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The petrology of the Ortakoy district and its ophiolite at the western edge of the Middle anatolian Massif, Turkey

Cited by 28 publications

References 21 publications

Hybridization of mafic microgranular enclaves: mineral and whole-rock chemistry evidence from the Karamadazı Granitoid, Central Turkey

Hybridization of mafic microgranular enclaves: mineral and whole-rock chemistry evidence from the Karamadazı Granitoid, Central Turkey

Characteristics of the amphibolites from Nigde metamorphics (Central Turkey), deduced from whole rock and mineral chemistry

Geological, petrological, and geodynamical characteristics of the Karacaali Magmatic Complex (Kırıkkale) in the Central Anatolian Crystalline Complex, Turkey

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