Geochemistry of the metavolcanic rocks from the Çangaldağ Complex in the Central Pontides: implications for the Middle Jurassic arc-back-arc system in the Neotethyan Intra-Pontide Ocean

Abstract: The Çangaldağ Complex in northern central Turkey is one of the main tectonic units of the Central Pontide Structural Complex that represents the remains of the poorly known Intra-Pontide branch of the Neotethys. It comprises low-grade metamorphic rocks of intrusive, extrusive, and volcaniclastic origin displaying a wide range of felsic to mafic compositions. Petrographically the complex consists of basalts-andesites-rhyodacites and tuffs with minor amount of gabbros and diabases. On the basis of geochemistry, the Çangaldağ samples are of subalkaline character and represented by both primitive and evolved members. All rock types are variably depleted in Nb compared to LREEs, similar to the lavas from subduction-related tectonic settings. In N-MORB normalized plots, the primitive members are separated into 3 groups on the basis of levels of enrichment. The first group is highly depleted and displays characteristics of boninitic lavas. The second group is relatively enriched compared to the first group but still more depleted than N-MORB. The third group, however, is the most enriched one among the three, whose level of enrichment is around that of N-MORB. The overall geochemical features suggest that the Çangaldağ Complex has been generated with the involvement of a subduction-modified mantle source. The chemistry of the primitive members further indicates that the melts generated for the formation of the Çangaldağ Complex probably occurred in both arc and back-arc regions above an intraoceanic subduction within the Intra-Pontide branch of the Neotethys.

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Aldanmaz E, Yalınız MK, Güçtekin A, Göncüoğlu MC (2008). Geochemical characteristics of mafic lavas from the Tethyan ophiolites in western Turkey: implications for heterogeneous source contribution during variable stages of ocean crust generation. Geol Mag 145: 37-54.
Aydın M, Demir O, Özçelik Y, Terzioğlu N, Satır M (1995). A geological revision of İnebolu, Devrekani, Ağlı and Küre areas: New observations in Paleo-Tethys - Neo-Tethys sedimentary successions. In: Erler A, Ercan T, Bingöl E, Örçen S, editors. Geology of the Black Sea Region. Ankara, Turkey: MTA/JMO, pp. 33-38.
Aydın M, Şahintürk Ö, Serdar HS, Özçelik Y, Akarsu İ, Üngör A, Çokuğraş R, Kasar S (1986). Ballıdağ-Çangaldağı (Kastamonu) arasındaki bölgenin jeolojisi. TJK Bülteni 29: 1-16 (in Turkish).
Aygül M, Okay AI, Oberhänsli R, Sudo M (2016). Pre-collisional accretionary growth of the southern Laurasian active margin, Central Pontides, Turkey. Tectonophysics 671: 218-234.
Boztuğ D, Debon F, Le Fort P, Yılmaz O (1995). High compositional diversity of the Middle Jurassic Kastamonu Plutonic Belt, northern Anatolia, Turkey. Turk J Earth Sci 4: 67-86.
Boztuğ D, Yılmaz O (1995). Daday-Devrekani masifi metamorfizması ve jeolojik evrimi, Kastamonu bölgesi, Batı Pontidler, Türkiye. TJK Bülteni 38: 33-52 (in Turkish).
Catanzariti R, Ellero A, Göncüoğlu MC, Marroni M, Ottria G, Pandolfi L (2013). The Taraklı Flysch in the Boyali area (Sakarya Terrane, northern Turkey): implications for the tectonic history of the IntraPontide suture zone. C R Geosci 345: 454-461.
Çimen O, Göncüoğlu MC, Sayıt K, Simonetti A (2016a). Whole rock geochemistry, U-Pb geochronology and Lu-Hf isotope systematics of the Çangaldağ Pluton (Central Pontides, Turkey). In: 69th Geological Congress of Turkey, Abstracts and Program, pp. 148-149.
Çimen O, Göncüoğlu MC, Simonetti A, Sayıt K (2016b). Zircon U-Pb geochronology, Hf isotopes and whole rock geochemistry of the meta-magmatic rocks from the Çangaldağ Complex (Central Pontides, Turkey). In: 69th Geological Congress of Turkey, Abstracts and Program, pp. 269-270.
Crawford AJ, Falloon TJ, Green DH (1989). Classification, petrogenesis and tectonic setting of boninites. In: Crawford AJ, editor. Boninites. London, UK: Unwin Hyman, pp. 1-49.
Davies JH, Bickle MJ (1991). A physical model for the volume and composition of melt produced by hydrous fluxing above subduction zones. Philos T R Soc 335: 355-364.
Dixon TH, Batiza R (1979). Petrology and chemistry of recent lavas in the Northern Marianas: implications for the origin of island arc basalts. Contrib Mineral Petrol 70: 167-181.
Duncan RA, Green DH (1987). The genesis of refractory melts in the formation of oceanic crust. Contrib Mineral Petrol 96: 326-342.
Ellero A, Ottria G, Sayit K, Catanzariti R, Frassi C, Göncüoğlu MC, Marroni M, Pandolfi L (2015). Geological and geochemical evidence for a Late Cretaceous continental arc in the central Pontides, northern Turkey. Ofioliti 40: 73-90.
Floyd PA, Winchester JA (1978). Identification and discrimination of altered and metamorphosed volcanic rocks using immobile elements. Chem Geol 21: 291-306.
Floyd PA, Winchester JA, Seston R, Kryza R, Crowley QG (2000). Review of geochemical variation in Lower Palaezoic metabasites from the NE Bohemian Massif; intracratonic rifting and plume ridge interaction. In: Franke W, Haak V, Oncken O, Tanner D, editors. Orogenic Processes: Quantifications and Modeling in the Variscan Belt. London, UK: Geological Society of London Special Publication 179, pp. 155-174.
Göncüoğlu MC (2010). Introduction to the Geology of Turkey: Geodynamic Evolution of the Pre-Alpine and Alpine Terranes. Ankara, Turkey: MTA.
Göncüoğlu MC, Gürsu S, Tekin UK, Köksal S (2008). New data on the evolution of the Neotethyan oceanic branches in Turkey: Late Jurassic ridge spreading in the Intra-Pontide branch. Ofioliti 33: 53-164.
Göncüoğlu MC, Kozlu H, Dirik K (1997). Pre-Alpine and Alpine terranes in Turkey: explanatory notes to the terrane map of Turkey. Ann Geol Pays Helleniques 37: 515-536.
Göncüoğlu MC, Marroni M, Pandolfi L, Ellero A, Ottria G, Catanzariti R, Tekin UK, Sayit K (2014). The Arkot Dağ Melange in Araç area, central Turkey: evidence of its origin within the geodynamic evolution of the Intra-Pontide suture zone. J Asian Earth Sci 85: 117-139.
Göncüoğlu MC, Marroni M, Sayit K, Tekin UK, Ottria G, Pandolfi L, Ellero A (2012). The Aylı Dağ ophiolite sequence (Central-Northerm Turkey): a fragment of Middle Jurassic Oceanic Lithosphere within the Intra-Pontide suture zone. Ofioliti 37: 77-92.
Göncüoğlu MC, Sayit K, Tekin UK (2010). Oceanization of the northern Neotethys: geochemical evidence from ophiolitic melange basalts within the IzmirAnkara suture belt, NW Turkey. Lithos 116: 175-187.
Göncüoğlu MC, Turhan N, Sentürk K, Özcan A, Uysal S (2000). A geotraverse across NW Turkey: tectonic units of the Central Sakarya region and their tectonic evolution. In: Bozkurt E, Winchester JA, Piper JD, editors. Tectonics and Magmatism in Turkey and the Surrounding Area. London, UK: Geological Society of London Special Publication 173, pp. 139-162.
Green DH (1973). Experimental melting studies on a model upper mantle composition at high pressure under water-saturated and water-unsaturated conditions. Earth Planet Sci Letter 19: 37-53.
Gribble RF, Stern RJ, Newman S, Bloomer SH, OHearn T (1998). Chemical and isotopic composition of lavas from the northern Mariana Trough; implications for magma genesis in back-arc basins. J Petrol 39: 125-154.
Gücer MA, Arslan M (2015). Petrochemistry, petrology, geochronology and P-T estimation of the Devrekani (Kastamonu, N Turkey) Massif. In: 25th Anniversary Goldschmidt Conference, Abstracts, p. 1113.
Gücer MA, Arslan M, Sherlock S, Heaman LM (2016). Permo-Carboniferous granitoids with Jurassic high temperature metamorphism in Central Pontides, Northern Turkey. Miner Petrol: 1-22.
Kaya MY, Altıner D (2014). Terebella lapilloides Münster, 1833 from the Upper Jurassic-Lower Cretaceous İnalti carbonates, northern Turkey: its taxonomic position and paleoenvironmental paleoecological significance. Turk J Earth Sci 23: 166-183.
Keller RA, Fisk MR, White WM, Birkenmajer K (1992). Isotope and trace element constraints on mixing and melting models of marginal basin volcanism, Barnsfield Strait, Antarctica. Earth Planet Sci Letter 111: 287-303.
Konya S, Pehlivanoğlu H, Teşrekli M (1988). Kastamonu, Taşköprü, Devrekani Yöresi Jeokimya Raporu. Ankara, Turkey MTA (in Turkish).
Kozur H, Aydın M, Demir O, Yakar H, Göncüoğlu MC, Kuru F (2000). New stratigraphic results from the Paleozoic and Early Mesozoic of the Middle Pontides (Northern Turkey). Geol Croat 53: 209-268.
Langmuir CH, Bézos A, Escrig S, Parman SW (2006). Chemical systematics and hydrous melting of the mantle in back-arc basins. In: Christie DM, Fisher CR, Lee SM, Givens S, editors. Back-Arc Spreading Systems: Geological, Biological, Chemical and Physical Interactions, Volume 166. Hoboken, NJ, USA: Wiley, pp. 87-146.
Marroni M, Frassi C, Göncüoğlu MC, Di Vincenzo G, Pandolfi L, Rebay G, Ellero A, Ottaria G (2014). Late Jurassic amphibolite-facies metamorphism in the Intra-Pontide Suture Zone (Turkey): an eastward extension of the Vardar Ocean from the Balkans into Anatolia? J Geol Soc 171: 605-608.
Meschede M (1986). A method of discriminating between different types of midocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram. Chem Geol 56: 207-218.
Okay AI, Altıner D, Kılıç A (2015). Triassic limestone, turbidites and serpentinitethe Cimmeride orogeny in the Central Pontides. Geol Mag 152: 460-479.
Okay AI, Gürsel S, Sherlock S, Altıner D, Tüysüz O, Kylander-Clark ARC, Aygül M (2013). Early Cretaceous sedimentation and orogeny on the active margin of Eurasia: Southern Central Pontides, Turkey. Tectonics 32: 1247-1271.
Okay AI, Gürsel S, Tüysüz O, Sherlock S, Keskin M, Kylander-Clark ARC (2014). Low-pressure - high-temperature metamorphism during extension in a Jurassic magmatic arc, Central Pontides, Turkey. J Metamorph Geol 32: 49-69.
Okay AI, Nikishin MA (2015). Tectonic evolution of the southern margin of Laurasia in the Black Sea region. Int Geol Rev 57: 1051-1076.
Okay AI, Tüysüz O (1999). Tethyan sutures of northern Turkey, in the Mediterranean Basins: Tertiary extension within the Alpine Orogen. Geol Soc London Spec Publ 156: 475-515.
Okay AI, Tüysüz O, Satır M, Özkan-Altıner S, Altıner D, Sherlock S, Eren RH (2006). Cretaceous and Triassic subduction-accretion, high-pressure-low-temperature metamorphism, and continental growth in the Central Pontides, Turkey. GSA Bull 118: 1247-1269.
Pearce JA (1975). Basalt geochemistry used to investigate past tectonic environments on Cyprus. Tectonophysics 25: 41-67.
Pearce JA (1996). A users guide to basalt discrimination diagrams. In: Wyman DA, editor. Trace Element Geochemistry of Volcanic Rocks: Applications for Massive Sulphide Exploration. Short Course Notes 12. St. Johns, Canada: Geological Association of Canada, pp. 79-113.
Pearce JA, Cann JR (1973). Tectonic setting of basic volcanic rocks determined using trace element analyses. Earth Planet Sci Letter 19: 290-300.
Pearce JA, Ernewein M, Bloomer SH, Parson LM, Murton BJ, Johnson LE (1995). Geochemistry of Lau Basin volcanic rocks: influence of ridge segmentation and arc proximity. In: Smellie JL, editor. Volcanism Associated with Extension at Consuming Plate Margins. London, UK: Geological Society of London Special Publication 81, pp. 53-75.
Pearce JA, Norry M (1979). Petrogenetic implications of Ti, Zr, Y and Nb variations in volcanic rocks. Contrib Mineral Petrol 69: 33-47.
Pearce JA, Peate DW (1995). Tectonic implications of the composition of volcanic arc magmas. Annu Rev Earth Pl Sc 23: 251-286.
Pearce JA, Stern RJ, Bloomer SH, Fryer P (2005). Geochemical mapping of the Mariana arc‐basin system: Implications for the nature and distribution of subduction components. Geochem Geophys Geosyst 6: Q07006.
Pearce JA, van der Laan SR, Arculus RJ, Murton BJ, Ishii T, Peate DW, Parkinson IJ (1992). Boninite and harzburgite from Leg 125 (Bonin-Mariana forearc): a case study of magma genesis during the initial stages of subduction. Proc Ocean Drill Prog Sci Res 125: 623-659.
Peate DW, Pearce JA, Hawkesworth CJ, Collie H, Edwards CHM, Hirose K (1997). Geochemical variations in Vanuatu arc lavas: the role of subducted material and a variable mantle wedge composition. J Petrol 38: 1331-1358.
Perfit MR, Fornari DJ (1983). Geochemical studies of abyssal lavas recovered by DSRV ALVIN from the eastern Galapagos Rift - Inca Transform - Ecuador Rift: II. Phase chemistry and crystallization history. J Geophys Res 88: 530-550.
Robertson A, Parlak O, Ustaömer T, Taslı K, İnan N, Dumitrica P, Karaoğlan F (2014). Subduction, ophiolite genesis and collision history of Tethys adjacent to the Eurasian continental margin: new evidence from the Eastern Pontides, Turkey. Geodin Acta 26: 230-293.
Sayit K, Marroni M, Göncüoğlu MC, Pandolfi L, Ellero A, Ottria G, Frassi C (2016). Geological setting and geochemical signatures of the mafic rocks from the Intra-Pontide Suture Zone: implications for the geodynamic reconstruction of the Mesozoic Neotethys. Int J Earth Sci 105: 39-64.
Şen Ş (2013). New evidences for the formation of and for petroleum exploration in the fold-thrust zones of the central Black Sea Basin of Turkey. Am Assoc Petrol Geol Bull 97: 465-485.
Şengör AMC, Yılmaz Y (1981). Tethyan evolution of Turkey: a plate tectonic approach. Tectonophysics 75: 181-241.
Şengün M, Akçaöre F, Keskin H, Akat U, Altun İE, Deveciler E, Sevin M, Armağan F, Erdoğan K, Acar Ş et al. (1988). Daday-Kastamonu-İnebolu Yöresinin Jeolojisi. Ankara, Turkey: MTA Raporu No: 8994 (in Turkish).Shervais JW (1982). TiV plots and the petrogenesis of modern ophiolitic lavas. Earth Planet Sci Lett 59: 101-118.
Stolper E, Newman S (1994). The role of water in the petrogenesis of Mariana trough magmas. Earth Planet Sci Lett 121: 293-325.
Sun SS, McDonough WF (1989). Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Geol Soc London Spec Publ 42: 313-345.
Taylor B, Martinez F (2003). Back-arc basin basalt systematics. Earth Planet Sci Lett 210: 481-497.
Tekin UK, Göncüoğlu MC, Pandolfi L, Marroni M (2012). Middle Late Triassic radiolarian cherts from the Arkotdağ melange in northern Turkey: implications for the life span of the northern Neotethyan branch. Geodin Acta 25: 305-319.
Tüysüz O (1985). Kargı Masifi ve dolayındaki tektonik birliklerin ayırdı ve araştırılması (petrolojik inceleme). PhD, İstanbul University, İstanbul, Turkey (in Turkish).
Tüysüz O (1990). Tectonic evolution of a part of the Tethyside orogenic collage: The Kargı Massif, northern Turkey. Tectonics 9: 141-160.
Uğuz MF, Sevin M (2007). Türkiye Jeoloji Haritaları, Kastamonu-E32 Paftası. Ankara, Turkey: Jeoloji Etütleri Dairesi (in Turkish).
Ustaömer T, Robertson AHF (1993). A late Palaeozoic-Early Mesozoic marginal basin along the active southern continental margin of Eurasia: evidence from the Central Pontides (Turkey) and adjacent regions. Geol J 28: 219-238.
Ustaömer T, Robertson AHF (1994). Late Palaezoic marginal basin and subduction-accretion: the Palaeotethyan Küre Complex, Central Pontides, northern Turkey. J Geol Soc London 151: 291-305.
Ustaömer T, Robertson AHF (1999). Geochemical evidence used to test alternative plate tectonic models for pre-Upper Jurassic (Palaeotethyan) units in the Central Pontides, N Turkey. Geol J 34: 25-53.
Wood DA, Gibson IL, Thompson RN (1976). Elemental mobility during zeolite facies metamorphism of the Tertiary basalts of eastern Iceland. Contrib Mineral Petrol 55: 241-254.
Yılmaz O (1980). Daday-Devrakani masifi kuzeydoğu kesimi litostratigrafi birimleri ve tektoniği. Yerbilimleri 5: 101-135 (in Turkish).
Yılmaz O (1983). Çangal metaofiyolitinin mineralojik-petrografik incelenmesi ve metamorfizma koşulları. Yerbilimleri 10: 45-58 (in Turkish).
Yılmaz O (1988). Lensemble ophiolitique de Çangal (Turquie du Nord): Mise en évidence dun métamorphisme océanique et dun rétrométamorphisme cataclastique tardif. Geologie Alpine 64: 113-132 (in French with abstract in English).
Yılmaz O, Bonhomme MG (1991). K-Ar isotopic age evidence for a Lower to Middle Jurassic low-pressure and a Lower Cretaceous high-pressure metamorphic events in north-central Turkey. Terra Abstracts 3: 501.
Yılmaz Y, Tüysüz O (1984). Kastamonu-Boyabat-Vezirköprü-Tosya Arasındaki Bölgenin Jeolojisi (Ilgaz-Kargı Masiflerinin Etüdü). Ankara, Turkey: MTA Raporu No. 7838 (in Turkish).