Samuele AGOSTINI, Mehmet Yılmaz SAVAŞÇIN, Murat TOKÇAER

Volcanic rocks from Foça-Karaburun and Ayvalık-Lesvos grabens (western Anatolia) and their petrogenic-geodynamic significance

Foça-Karaburun ve Ayvalık-Midilli grabenleri, Batı Anadolunun kıyı kesiminde kalan, KB−GD yönlü iki önemli genleşme alanlarıdır. Bu grabenler, Ege Denizinin yay arkası havzasının açılımı ile de ilişkili olan Erken Miyosen−Holosen genleşmesinin etkisinde kalmış geniş alanların petrojenik ve jeodinamik gelişimlerine örnek teşkil eden çok önemli lokasyonlardır. Bu bağlamda, Foça-Karaburun ve Ayvalık-Midilli grabenleri, D−B transtansiyonel faylar ile parçalara ayrılmış, KD−GB yönlü açılma sunan bölgedeki büyük graben sistemleridir. Batı Anadolu’da, kalkalkali ve şoşonitik volkanikler ile UK, UK-şoşonitik veya lamproitik kayalar orojenik ortamları yansıtırlarken, daha genç olan K ve Na alkali bazaltik kayalar kıtasal koşullar altındaki kıta içi magmatizması ürünleri olan okyanus adası bazaltları (OIB) ile temsil edilirler. Çalışma alanının tektonik hatları, Batı Anadolu ve Ege Denizi’nin tektonik evrimini yeniden yapılandırabilirken, çalışılan iki grabendeki ve çevresindeki Neojen volkanizmasının farklı seviyelerindeki kayaları, bu kayaları üreten magma kaynaklarının jeokimyasal gelişiminin kesin bir kaydını tutmaktadırlar.

Foça-Karaburun ve Ayvalık-Midilli grabenlerindeki (Batı Anadolu) volkanik kayalar ve onların petrojenetik-jeodinamik önemleri

The Foça-Karaburun and Ayvalık-Lesvos grabens (western coast of Anatolia, Turkey) are two important NW−SE-trending extensional areas generated in response to the Early Miocene−Holocene extension of the Western Anatolian region, related to the opening of the ‘unconventional’ back-arc basin of the Aegean Sea. The abundance of geo-structural evidence and the occurrence of volcanic rocks representing all the stages of the Aegean-Western Anatolia volcanism render the Foça-Karaburun and Ayvalık-Lesvos Grabens key localities to exemplify the petrogenetic and geodynamic evolution of the area. In this context, the Foça-Karaburun and Ayvalık-Lesvos grabens, possibly formerly a single graben, formed along an original NE−SW-trending extension, later dissected by E−W-trending transtensional faults, are investigated to constrain the petrogenetic and geodynamic evolution of the whole Aegean region. Calcalkaline and shoshonitic volcanic rocks with scattered ultrapotassic-shoshonitic or lamproitic lavas and dykes represent the orogenic phase of the magmatic activity, while the younger K- and Na-rich alkaline basaltic rocks are the result of later magmatism characterized by an intraplate geochemical signature reflecting progressively decreasing subduction rates. While the tectonic lineaments and the structures of the study area allow the reconstruction of the tectonic evolution of Western Anatolia and Aegean Sea, the volcanic rocks from the different stages of Neogene volcanism within the two studied grabens and surrounding areas permit a precise record of the geochemical evolution of the magma sources.

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AGOSTINI, S., DOGLIONI, C., INNOCENTI, F., MANETTI, P., SAVAŞÇIN, M.Y. & TONARINI, S. 2005. Tertiary high-Mg volcanic rocks from western Anatolia and their geodynamic significance for the evolution of the Aegean area. In: FYTIKAS, M. &
VOUGIOULAKAKIS, G. (eds), The South Aegean Volcanic Arc: Present Knowledge and Future Perspectives. Elsevier Book Special Series, Developments on Volcanology 7, 345–362.
AGOSTINI, S., DOGLIONI, C., INNOCENTI, F., MANETTI, P., TONARINI, S. & SAVAŞÇIN, M.Y. 2007. The transition from orogenic to intraplate Neogene magmatism in Western Anatolia and Aegean area. In: BECCALUVA, L., BIANCHINI, G. & WILSON, M. (eds), Cenozoic Volcanism in the Mediterranean Area. Geological Society of America Special Paper 418, 1–15.
AGOSTINI, S., RYAN, J.G., TONARINI, S. & INNOCENTI, F. 2008. Drying and dying of a subducted slab: coupled Li and B isotope variations in Western Anatolia Cenozoic volcanism. Earth Planetary Science Letters 272, 139–147.
AGOSTINI, S., DOGLIONI, C., INNOCENTI, F., MANETTI, P. & TONARINI, S. 2010. On the geodynamics of the Aegean rift. Tectonophysics, doi:10.1016/j.tecto.2009.07.025 [in press].
AKAY E. 2000. Magmatic and Tectonic Evolution of the Yuntdağ Volcanic Complex (Western Anatolia). PhD Thesis, Dokuz Eylül University, İzmir [unpublished].
AKSU, A.E., PIPER, D.J.W. & KONUK, T. 1987. Late Quaternary tectonic and sedimentary history of outer İzmir and Çandarlı bays, Western Turkey. Marine Geology 76, 89–104.
ANGELIER, J., CANTAGREL, J.M. & VILMINOT, J.C. 1977. Néotectonique cassante et volcanisme plio–quaternaire dans l'arc égéen interne: l'île de Milos (Grèce). Bulletin de la Société géologique de France 19, 119–123.
AKYÜREK, B. & SOYSAL, Y. 1983. Biga Yarımadası güneyinin (Savaştepe-Kırkağaç-Bergama-Ayvalık) temel jeolojisi özellikleri [Basic geological characteristics of southern part (Savaştepe-Kırkağaç-Bergama-Ayvalık) of Biga Peninsula]. Mineral Research and Exploration Institue (MTA) Bulletin 95/96, 1–2.
ALDANMAZ, E., PEARCE, J.A., THIRLWALL, M.F. & MITCHELL, J.G. 2000. Petrogenetic evolution of late Cenozoic, post-collision volcanism in western Anatolia, Turkey. Journal of Volcanology and Geothermal Research 102, 67–95.
ALICI, P., TEMEL, A. & GOURGAUD, A. 2002. Pb-Nd-Sr isotope and trace element geochemistry of Quaternary extension-related alkaline volcanism: a case study of Kula region (Western Anatolia, Turkey). Journal of Volcanology and Geothermal Research 115, 487–510.
ALTUNKAYNAK, S. & YILMAZ, Y. 1999. The Kozak Pluton and its emplacement. Geological Journal 34, 257–274.
ALTUNKAYNAK, Ş. & YILMAZ, Y. 2000. Foça yöresinin jeolojisi ve aktif tektoniği, Batı Anadolu [Geology and active tectonics of Foça region, Western Anatolioa]. Batı Anadolu’nun Depremselliği Sempozyumu (BADSEM 2000), Abstracts Book, 160–165.
BORSI, S., FERRARA, G., INNOCENTI, F. & MAZZUOLI, R. 1972. Geochronology and petrology of recent volcanics in the eastern Aegean Sea (western Anatolia and Lesbos Island). Bulletin of Volcanology 36, 473–496.
BOZKURT, E. & SÖZBİLİR, H. 2004. Tectonic evolution of the Gediz Graben: field evidence for an episodic, two stage extension in western Turkey. Geological Magazine 141, 63–79.
BRINKMANN, R. 1966. Geotektonische Gliederung von Anatolien. Neues Jahrbuch für Geologie und Paläontologie Monatshefte 10, 603–618.
BRINKMANN, R. 1968. Einige geologische leitlinien von Anatolien (Beitraege zur Geologie von Anatolien Nr. 4). Geologica et Palaeontologica 2, 111–119.
BRINKMANN, R. 1971. The geology of western Anatolia. In: CAMPBELL, A.S. (ed), The Geology and History of Turkey. Petroleum Exploration Society of Libya, 171–190.
COHEN, H.A., DART, C.J., AKYÜZ, H.S. & BARKA, A.A. 1995. Syn-rift sedimentation and structural development of the Gediz and Büyük Menderes grabens, Western Turkey. Journal of the Geological Society, London 152, 629–638.
COLLINS, A.S. & ROBERTSON, A.H.F. 1998. Processes of Late Cretaceous to Late Miocene episodic thrust-sheet translation in the Lycian Taurides, SW Turkey. Journal of the Geological Society, London 155, 759–772.
DEWEY, J.F. & ŞENGÖR, A.M.C. 1979. Aegean and surrounding regions complex multiplate and continuum tectonics in a convergent zone. Geological Society of America Bulletin 90, 84– 92.
DOGLIONI, C., AGOSTINI, S., CRESPI, M., INNOCENTI, F., MANETTI, P., RIGUZZI, F. & SAVAŞÇIN, M.Y. 2002. On the extension in western Anatolia and the Aegean Sea. Journal of Virtual Explorer 8, 169 –183.
DOGLIONI, C., CARMINATI, E., CUFFARO, M. & SCROCCA, D. 2007. Subduction kinematics and dynamic constraints. Earth Science Reviews 83, 125–175.
DORA, O. & SAVAŞÇIN, M.Y. 1982. Alibey-Maden adaları (Ayvalık) bölgesi magmatizması [Alibey-Maden islands (Ayvalık) region magmatism]. TÜBİTAK 7. Bilim Kongress Proceedings Earth Sciences Section, 11–35.
DORA, O., SAVAŞÇIN, M.Y., KUN, N. & CANDAN, O. 1987. Postmetamorphic plutons in the Menderes Masif. Hacettepe Üniversitesi Yerbilimleri Dergisi 14, 79–89.
EMRE, T. & SÖZBİLİR, H. 2005. Küçük Menderes Grabeni Doğu ucundaki andezitlerin (Başova-Kiraz/İzmir) jeolojisi, petrografisi ve jeokimyası [Geology, petrography and geochemistry of andesites in the eastern end (Başova- Kiraz/İzmir) of Küçük Menderes Graben]. Mineral Research and Exploration Institue (MTA) Bulletin 131, 1–20.
ERCAN, T., SATIR, M., SEVİN, D. & TÜRKECAN, A. 1996. Batı Anadolu’daki Tersiyer ve Kuvaterner yaşlı volkanik kayaçlarda yeni yapılan radyometrik yaş ölçümlerinin yorumu [Interpretation of new radiometric age data on Tertiary and Quaternary volcanic rocks of western Anatolia]. Mineral Research and Exploration Institue (MTA) Bulletin 119, 103– 112.
ERDOĞAN, B. 1990. İzmir-Ankara Zonu ile Karaburun kuşağının tektonik ilişkisi [Tectonic relationship between İzmir-Ankara zone and Karaburun belt]. Mineral Research and Exploration Institue (MTA) Bulletin 110, 1–15.
ERDOĞAN, B. & GÜNGÖR, T. 2004. The problem of the core-cover boundary of the Menderes Massif and an emplacement mechanism for regionally extensive gneissic granites, Western Anatolia (Turkey). Turkish Journal of Earth Sciences 13, 15–36.
ERKÜL, F., HELVACI, C. & SÖZBİLİR, H. 2005. Evidence for two episodes of volcanism in Bigadic borate basin and tectonic implications for Western Turkey. Geological Journal 40, 1–26.
FYTIKAS, M., GIULIANI, O., INNOCENTI, F., MARINELLI, G. & MAZZUOLI, R. 1976. Geochoronological data on recent magmatism of the Aegean Sea. Tectonophysics 31, 29–34.
FYTIKAS, M., INNOCENTI, F., MANETTI, P., MAZZUOLI, R., PECCERILLO, A. & VILLARI, L. 1984. Tertiary to Quaternary evolution of volcanism in the Aegean region. In: DIXON, J.E. & ROBERTSON, A.H.F. (eds), The Geological Evolution of the Eastern Mediterranean. Geological Society, London, Special Publications 17, 687–700.
GÜLEN, L. 1990. Isotopic characterisation of Aegean magmatism and geodynamic evolution of the Aegean subduction. In: SAVAŞÇIN, M.Y. & ERONAT, A.H. (eds), International Earth Sciences Colloquium on the Aegean Region Proceedings 2, 143–166.
GÜNGÖR, T. & ERDOĞAN, B. 2001. Emplacement age and direction of the Lycian nappes in the Söke-Selçuk region, western Turkey. International Journal of Earth Sciences 89, 874–882.
HAYWARD, A.B. & ROBERTSON, A.H.F. 1982. Direction of ophiolite emplacement inferred from Cretaceous and Tertiary sediments of an adjacent autochthon, the Bey Dağları, Soutwest Turkey. Geological Society of America Bulletin 93, 68– 75.
INNOCENTI, F., AGOSTINI, S., DI VINCENZO, G., DOGLIONI, C., MANETTI, P., SAVAŞÇIN, M.Y. & TONARINI, S. 2005. Neogene and Quaternary volcanism in western Anatolia: magma sources and geodynamic evolution. Marine Geology 221, 397–421.
IŞIK, V., TEKELİ, O. & SEYİTOĞLU, G. 2004. The 40Ar/39Ar age of extensional ductile deformation and granitoid intrusion in the northern Menderes core complex: implications for the initiation of extensional tectonics in western Turkey. Journal of Asian Earth Sciences 23, 555–566.
İNCİ, U., SÖZBİLİR, H., SÜMER, Ö. & ERKÜL, F. 2003. Urla-Balıkesir arası depremlerinin nedeni fosil bir fay [The source of earthquakes in Urla-Balıkesir is a fossil fault]. Cumhuriyet Bilim Teknik Dergisi 21, 7–8.
JECKELMANN, C. 1996. Genese Lokaler Thermalwasservorkommen in der region Bergama/ W-Türkei. PhD Thesis (Diss. ETH Nr. 11990), Zürich.
KAYA, O. 1979. Ortadoğu Ege çöküntüsünün (Neojen) stratigrafisi ve tektoniği [Stratigraphy and tectonics of middle eastern Aegean depression]. Bulletin of the Geological Soceity of Turkey 22, 35– 58 [in Turkish with and English abstract].
KAYA, O. 1981.Miocene reference section for the coastal part of west Anatolia. Newsletters of Stratigraphy 10, 164–191.
KAYA, O. 1982. Tersiyer sırt yitmesi: doğu Ege bölgelerinin yapısı ve magmatikliği için olasılı bir mekanizma [Tertiary ridge subduction: a possible mechanism for the structure and magmatism of eastern Aegean region ]. In: Erol, O. & Oygür, V. (eds), Batı Anadolu’nun Genç Tektoniği ve Volkanizması Paneli (Panel Book of the Congress of the Geological Society of Turkey), Ankara, 39–58.
KOÇYİĞİT, A. 1984. Güneybatı Türkiye ve yakın dolayında levha içi yeni tektonik gelişim [Intra-plate neotectonic development in southwestern Turkey and adjacent areas]. Bulletin of the Geological Soceity of Turkey 27, 1–16 [in Turkish with and English abstract].
KOÇYİĞİT, A., YUSUFOĞLU, H. & BOZKURT, E. 1999. Evidence from the Gediz Graben for episodic two-stage extension in western Turkey. Journal of the Geological Society, London 156, 605–616.
KONAK, N. 1982. Simav dolayının jeolojisi ve metamorfik kayaçlarının evrimi [Geology and evolution of the metamorphic rocks in Simav region]. İstanbul Yerbilimleri Dergisi 3, 313–317 [in Turkish with and English abstract].
LE MAITRE, R.W. 2002. Igneous Rocks – A Classification and Glossary of Terms. Cambridge University Press, Cambridge.
LIPS, A.L.W., CASSARD, D., SÖZBİLİR, H., YILMAZ, H. & WIJBRANS, J. 2001. Multistage exhumation of the Menderes Massif, western Anatolia (Turkey). International Journal of Earth Sciences 89, 781–792.
MCKENZIE, D. 1972. Active tectonics of the Mediterranean region. Journal of the Royal Astronomical Society 30, 109–185.
OCAKOĞLU, N., DEMİRBAĞ, E. & KUŞÇU, İ. 2004. Neotectonic structures in the area offshore of Alaçatı, Doğanbey and Kuşadası (Western Turkey): evidence of strike-slip faulting in the Aegean extensional province. Tectonophysics 391, 67–83.
OCAKOĞLU, N., DEMİRBAĞ, E. & KUŞÇU, İ. 2005. Neotectonic structures in İzmir Gulf and surrounding regions (Western Turkey): evidence of strike-slip faulting with compression in the Aegean extensional regime. Marine Geology 219, 155–171.
OCAKOĞLU, N., DEMİRBAĞ, E., & KUŞÇU, İ. 2006. İzmir Körfezi ve çevresinin sualtı aktif fayları ve depremselliği [The submarine active faults and the seismicity of the Gulf of İzmir and surrounding area]. Yerbilimleri Dergisi 27, 23–40 [in Turkish with and English abstract].
PE-PIPER, G. & PIPER, D.J.W. 1989. Spatial and temporal variation in late Cenozoic back-arc volcanic rocks, Aegean Sea region. Tectonophysics 169, 113–134.
PFISTER, M., GREBER, E., SCHINDLER, C., STRAUB, C., KAHLE, H.G. & RYBACH, L. 2000. Geodynamics of the Marmara Sea region Recent tectonic activity and the role of fluids at the Western end of the North Anatolian Fault Zone. Bulletin of Applied Geology 5, 155–176.
RIMMELÉ, G., OBERHÄNSLI, R., GOFFÉ, B., JOLIVET, L., CANDAN, O. & ÇETİNKAPLAN, M. 2003. First evidence of high-pressure metamorphism in the cover series of the Menderes Massif: tectonic and metamorphic implications for the evolution of SW Turkey. Lithos 71, 19–46.
SAVAŞÇIN, M.Y. 1976. Some alkaline rocks and hybrid magmas of the western Anatolia. International Congress on Thermal Waters: Geotermal Energy and Volcanism of the Mediterranean Area Proceedings 3, 225–239.
SAVAŞÇIN, M.Y. 1978. Foça-Urla Neojen Volkanitlerinin Mineralojik- Jeokimyasal İncelenmesi ve Kökensel Yorumu [Mineralogy- Geochemistry and Interpretation of Foça-Urla Neogene Volcanics]. Dissertation Thesis, Dokuz Eylül University [unpublished, in Turkish with English abstract].
SAVAŞÇIN, M.Y. & GÜLEÇ, N. 1990. Neogene Volcanism of Western Anatolia. International Earth Sciences Colloquium on the Aegean Region, Field excursion B3 Guide Book.
SAVAŞÇIN, M.Y. & ERLER, A. 1994. Neogene–Quaternary Magmatism and Related Ore Deposits of Western Anatolia. International Volcanological Congress, Field excursion Guide book.
ŞENGÖR, A.M.C. 1979. The North Anatolian transform fault: its age, offset and tectonic significance. Journal of the Geological Society, London 136, 269–282.
ŞENGÖR, A.M.C. & YILMAZ, Y. 1981. Tethyan evolution of Turkey: a plate tectonic approach. Tectonophysics 75, 181–241.
SEYİTOĞLU, G. & SCOTT, B.C. 1991. Late Cenozoic crustal extension and basin formation in West Turkey. Geological Magazine 128, 155–166.
SEYİTOĞLU, G. & SCOTT, B.C. 1992. The age of Büyük Menderes Graben (West Turkey) and its tectonic implications. Geological Magazine 129, 239–242.
SEYİTOĞLU, G. & SCOTT, B.C. 1996. The cause of N–S extensional tectonics in Western Turkey: tectonic escape vs back-arc spreading vs orogenic collapse. Journal of Geodynamics 22, 145–153.
SEYİTOĞLU, G., ANDERSON, D., NOWELL, G. & SCOTT, B. 1997. The evolution from Miocene potassic to Quaternary sodic magmatism in western Turkey: implications for enrichment processes in the lithospheric mantle. Journal of Volcanology and Geothermal Research 76, 127–147.
SÖZBİLİR, H., ERKÜL, F. & SÜMER, Ö. 2003. Gümüldür (İzmir) ve Bigadiç (Balıkesir) arasında uzanan Miyosen sonrası yaşlı KDdoğrultulu accommodation zonuna ait saha verileri, Batı Anadolu [Field evidence for post-Miocene NE-trending accommodation zone lying between Gümüldür (İzmir) and Bigadiç (Balıkesir), Western Anatolia]. 56th Geological Congress of Turkey Abstract Books, 85–86.
TOKÇAER, M., AGOSTINI, S. & SAVAŞÇIN, M.Y. 2005. Geotectonic setting, origin and emplacement model of the youngest Kula Volcanics in Western Anatolia. Turkish Journal of Earth Sciences 142, 145–166.
TONARINI, S., AGOSTINI, S., INNOCENTI, F. & MANETTI, P. 2005. δ11B as tracer of slab dehydration and mantle evolution in Western Anatolia Cenozoic magmatism. Terra Nova 17, 259–264.
WESTAWAY, R. 1990. Block rotation in western Turkey, observational evidence. Journal of Geophysical Research 95, 19857–19884.
YILMAZ, Y. 1989. An approach to the origin of young volcanic rocks of western Turkey. In: ŞENGÖR, A.M.C. (ed), Tectonic Evolution of the Tethyan Region. Kluwer, The Hague, 159–189.
YILMAZ, Y., GENÇ, Ş.C., GÜRER, O.F., BOZCU, M., YILMAZ, K., KARACIK, Z., ALTUNKAYNAK, Ş. & ELMAS, A. 2000. When did the western Anatolian grabens begin to develop? In: BOZKURT, E., WINCHESTER, J.A. & PIPER, J.D.A. (eds), Tectonics and Magmatism in Turkey and its Surrounding Area. Geological Society, London, Special Publications 173, 353–384.