Petrogenesis and geodynamics of plagiogranites from Central Turkey (Ekecikdağ/Aksaray): new geochemical and isotopic data for generation in an arc basin system within the northern branch of Neotethys

In the Late Cretaceous, throughout the closure of the Neotethys Ocean, ophiolitic rocks from the İzmir–Ankara–Erzincan ocean branch were overthrusted the northern margin of the Tauride-Anatolide Platform. The ophiolitic rocks in the Ekecikdağ (Aksaray/Central Turkey) region typify the oceanic crust...

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Veröffentlicht in:International journal of earth sciences : Geologische Rundschau 2017-06, Vol.106 (4), p.1181-1203
Hauptverfasser: Köksal, Serhat, Toksoy-Köksal, Fatma, Göncüoglu, M. Cemal
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Toksoy-Köksal, Fatma
Göncüoglu, M. Cemal
description In the Late Cretaceous, throughout the closure of the Neotethys Ocean, ophiolitic rocks from the İzmir–Ankara–Erzincan ocean branch were overthrusted the northern margin of the Tauride-Anatolide Platform. The ophiolitic rocks in the Ekecikdağ (Aksaray/Central Turkey) region typify the oceanic crust of the İzmir–Ankara–Erzincan branch of Neotethys. The gabbros in the area are cut by copious plagiogranite dykes, and both rock units are intruded by mafic dykes. The plagiogranites are leucocratic, fine- to medium-grained calc-alkaline rocks characterized mainly by plagioclase and quartz, with minor amounts of biotite, hornblende and clinopyroxene, and accessory phases of zircon, titanite, apatite and opaque minerals. They are tonalite and trondhjemite in composition with high SiO 2 (69.9–75.9 wt%) and exceptionally low K 2 O (
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Cemal</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Petrogenesis and geodynamics of plagiogranites from Central Turkey (Ekecikdağ/Aksaray): new geochemical and isotopic data for generation in an arc basin system within the northern branch of Neotethys</atitle><jtitle>International journal of earth sciences : Geologische Rundschau</jtitle><stitle>Int J Earth Sci (Geol Rundsch)</stitle><date>2017-06-01</date><risdate>2017</risdate><volume>106</volume><issue>4</issue><spage>1181</spage><epage>1203</epage><pages>1181-1203</pages><issn>1437-3254</issn><eissn>1437-3262</eissn><abstract>In the Late Cretaceous, throughout the closure of the Neotethys Ocean, ophiolitic rocks from the İzmir–Ankara–Erzincan ocean branch were overthrusted the northern margin of the Tauride-Anatolide Platform. The ophiolitic rocks in the Ekecikdağ (Aksaray/Central Turkey) region typify the oceanic crust of the İzmir–Ankara–Erzincan branch of Neotethys. The gabbros in the area are cut by copious plagiogranite dykes, and both rock units are intruded by mafic dykes. The plagiogranites are leucocratic, fine- to medium-grained calc-alkaline rocks characterized mainly by plagioclase and quartz, with minor amounts of biotite, hornblende and clinopyroxene, and accessory phases of zircon, titanite, apatite and opaque minerals. They are tonalite and trondhjemite in composition with high SiO 2 (69.9–75.9 wt%) and exceptionally low K 2 O (&lt;0.5 wt%) contents. The plagiogranites in common with gabbros and mafic dykes show high large-ion lithophile elements/high-field strength element ratios with depletion in Nb, Ti and light rare-earth elements with respect to N-MORB. The plagiogranites together with gabbros and mafic dykes show low initial 87 Sr/ 86 Sr ratios (0.70419–0.70647), high ƐNd ( T ) (6.0–7.5) values with 206 Pb/ 204 Pb (18.199–18.581), 207 Pb/ 204 Pb (15.571–15.639) and 208 Pb/ 204 Pb (38.292–38.605) ratios indicating a depleted mantle source modified with a subduction component. They show similar isotopic characteristics to the other supra-subduction zone (SSZ) ophiolites in the Eastern Mediterranean to East Anatolian–Lesser Caucasus and Iran regions. It is suggested that the Ekecikdağ plagiogranite was generated in a short time interval from a depleted mantle source in a SSZ/fore-arc basin setting, and its nature was further modified by a subduction component during intra-oceanic subduction.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s00531-016-1401-5</doi><tpages>23</tpages><orcidid>https://orcid.org/0000-0002-0094-9481</orcidid></addata></record>
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subjects Apatite
Basins
Biotite
Composition
Cretaceous
Data analysis
Depletion
Earth
Earth and Environmental Science
Earth Sciences
Field strength
Gabbros
Geochemistry
Geodynamics
Geology
Geophysics/Geodesy
Isotopes
Lead isotopes
Magma
Mantle
Mineral Resources
Minerals
Oceanic crust
Oceans
Ophiolites
Original Paper
Petrogenesis
Plagioclase
Rare earth elements
Ratios
Rock
Rock intrusions
Rocks
Sedimentology
Silica
Silicon dioxide
Strontium 87
Strontium isotopes
Structural Geology
Subduction
Subduction zones
Tectonophysics
Titanite
Titanium
Zircon
title Petrogenesis and geodynamics of plagiogranites from Central Turkey (Ekecikdağ/Aksaray): new geochemical and isotopic data for generation in an arc basin system within the northern branch of Neotethys
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