| Petrology of ultramafic to mafic cumulate rocks from the G?ksun(Kahramanmaras) ophiolite,southeast Turkey |
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| 引用本文： | Osman Parlak,Utku Bagc?,Tamer R?zaoglu,Corina Ionescu,Güzide?nal,Volker H?ck,Hüseyin Kozlu.Petrology of ultramafic to mafic cumulate rocks from the G?ksun(Kahramanmaras) ophiolite,southeast Turkey[J].地学前缘(英文版),2020,11(1):109-128. |
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| 作者姓名： | Osman Parlak Utku Bagc? Tamer R?zaoglu Corina Ionescu GüzideÖnal Volker Höck Hüseyin Kozlu |
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| 作者单位： | Çukurova Universitesi;State Key Laboratory of Geological Processes and Mineral Resources;Mersin Universitesi;Kahramanmaras¸SütçüImam Universitesi;Babes-Bolyai University;Kazan（Volga Region）Federal University;University of Salzburg;Türkiye Petrolleri Anonim Ortakl?g? |
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| 基金项目： | supported by TüBITAK (YDABCAG199Y011) and the Cukurova University Scientific Research Projects (MMF2002BAP41);the Open Fund (GPMR201702) of State Key Lab of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan;subsidy by the Russian Government to support the Program of competitive growth of Kazan Federal University |
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| 摘 要： | The G?ksun(Kahramanmaras)ophiolite(GKO),cropping out in a tectonic window bounded by the Malatya metamorphic unit on both the north and south,is located in the EW-trending lower nappe zone of the southeast Anatolian orogenic belt(Turkey).It exhibits a complete oceanic lithospheric section and overlies the Middle Eocene Maden Group/Complex with a tectonic contact at its base.The ophiolitic rocks and the tectonically overlying Malatya metamorphic(continental)unit were intruded by I-type calc-alkaline Late Cretaceous granitoid(~81-84 Ma).The ultramafic to cumulates in the GKO are represented by wehrlite,plagioclase wehrlite,olivine gabbro and gabbro.The crystallization order for the cumulate rocks is as follows:olivine±chromian spinel→clinopyroxene→plagioclase.The major and trace element geochemistry as well as the mineral chemistry of the ultramafic to mafic cumulate rocks suggest that the primary magma generating the GKO is compositionally similar to that observed in the modern island-arc tholeiitic sequences.The mineral chemistry of the ultramafic to mafic cumulates indicates that they were derived from a mantle source that was previously depleted by earlier partial melting events.The highly magnesian olivine(Fo77-83),clinopyroxene(Mg#of 82-90)and the highly Ca-plagioclase(An81-89)exhibit a close similarity to those,which formed in a supra-subduction zone(SSZ)setting.The field and the geochemical evidence suggest that the GKO formed as part of a much larger sheet of oceanic lithosphere,which accreted to the base of the Tauride active continental margin,including the ispendere,K?mürhan and the Guleman ophiolites.The latter were contemporaneous and genetically/tectonically related within the same SSZ setting during the closure of the Neotethyan oceanic basin(Berit Ocean)between the Taurides to the north and the Bitlis-Pütürge massif to the south during the Late Cretaceous.
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| 关 键 词： | Göksun(Kahramanmaras)ophiolite CUMULATE SSZ-Spreading NEOTETHYS Late Cretaceous SE Anatolia |
| 收稿时间： | 4 May 2018 |
Petrology of ultramafic to mafic cumulate rocks from the Göksun (Kahramanmara?) ophiolite,southeast Turkey |
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| Institution: | 1. Çukurova Üniversitesi, Jeoloji Mühendisli?i Bölümü, Balcal?, TR-01330 Adana, Turkey;2. State Key Laboratory of Geological Processes and Mineral Resources, Center for Global Tectonics, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;3. Mersin Üniversitesi, Jeoloji Mühendisli?i Bölümü, Çiftlikköy, TR-33343 Mersin, Turkey;4. Kahramanmara? Sütçü ?mam Üniversitesi, Jeoloji Mühendisli?i Bölümü, Av?ar Kampüsü, TR-46100 Kahramanmara?, Turkey;5. Babe?-Bolyai University, Geology Department, 1 Kog?lniceanu Str., RO-400084 Cluj-Napoca, Romania;6. Kazan (Volga Region) Federal University, Archeotechnologies & Archeological Material Sciences Laboratory, 18 Kremlevskaya Str., 420000 Kazan, Russia;7. University of Salzburg, Division of Geography and Geology, 34 Hellbrunner Str., A-5020 Salzburg, Austria;8. Türkiye Petrolleri Anonim Ortakl???, TR-06520 Ankara, Turkey |
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| Abstract: | The Göksun (Kahramanmara?) ophiolite (GKO), cropping out in a tectonic window bounded by the Malatya metamorphic unit on both the north and south, is located in the EW-trending lower nappe zone of the southeast Anatolian orogenic belt (Turkey). It exhibits a complete oceanic lithospheric section and overlies the Middle Eocene Maden Group/Complex with a tectonic contact at its base. The ophiolitic rocks and the tectonically overlying Malatya metamorphic (continental) unit were intruded by I-type calc-alkaline Late Cretaceous granitoid (～81–84 Ma). The ultramafic to cumulates in the GKO are represented by wehrlite, plagioclase wehrlite, olivine gabbro and gabbro. The crystallization order for the cumulate rocks is as follows: olivine ± chromian spinel→clinopyroxene→plagioclase. The major and trace element geochemistry as well as the mineral chemistry of the ultramafic to mafic cumulate rocks suggest that the primary magma generating the GKO is compositionally similar to that observed in the modern island-arc tholeiitic sequences. The mineral chemistry of the ultramafic to mafic cumulates indicates that they were derived from a mantle source that was previously depleted by earlier partial melting events. The highly magnesian olivine (Fo77–83), clinopyroxene (Mg# of 82–90) and the highly Ca-plagioclase (An81–89) exhibit a close similarity to those, which formed in a supra-subduction zone (SSZ) setting. The field and the geochemical evidence suggest that the GKO formed as part of a much larger sheet of oceanic lithosphere, which accreted to the base of the Tauride active continental margin, including the ?spendere, Kömürhan and the Guleman ophiolites. The latter were contemporaneous and genetically/tectonically related within the same SSZ setting during the closure of the Neotethyan oceanic basin (Berit Ocean) between the Taurides to the north and the Bitlis-Pütürge massif to the south during the Late Cretaceous. |
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| Keywords: | Göksun (Kahramanmara?) ophiolite Cumulate SSZ-Spreading Neotethys Late Cretaceous SE Anatolia |
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