Gürol SEYİTOĞLU, Korhan ESAT

Uludağ Extensional Metamorphic Core Complex: Preliminary Field Observations

In the northern margin of Uludağ massif in northwest Anatolia, the Bursa Detachment having top-to-the north, northeast normal sense of shear separates the lower plate high-grade metamorphic rocks of Series-A (Uludağ Group) from the upper plate low-grade metamorphic rocks of Series-B (Karakaya Complex). The deeper section of Uludağ massif is represented by the Oligocene metagranites at the southern parts of the massif that is exposed due to the youngest high-angle Soğukpınar normal fault. The massif is a typical extensional metamorphic core complex similar to the counterparts in west and northwest Anatolia such as the Menderes, Kazdağ, and Çataldağ core complexes due to close timing of exhumation and a similar sense of shearing.

Keywords:

Uludağ Core Complex, North Anatolian Fault Eskişehir Fault, Southern Marmara,

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Aksoy, R. 1996. Marmara Adası ve Kapıdağı Yarımadası’nın mesoskopik tektonik özellikleri. Turkish Journal of Earth Sciences 5, 187-195.
Allmendinger, R. W., Cardozo, N. C., Fisher, D. 2012. Structural Geology Algorithms: Vectors and Tensors. Cambridge University Press, 289.
Barka, A. 1992. The North Anatolian Fault Zone. Annales Tectonicae 6, 164-195.
Barka, A., Kadinsky Cade, K. 1988. Strike-slip fault geometry in Turkey and its influence on earthquake activity. Tectonics 7, 663-684.
Bozkurt, E., Park, R. G. 1994. Southern Menderes massif: an incipient metamorphic core complex in Western Anatolia, Turkey. Journal of the Geological Society of London 151, 213-216.
Emre, Ö., Doğan, A., Duman, T. Y., Özalp, S. 2011a. Bursa (NK 35-12) quadrangle, active fault map series of Turkey. General Directorate of Mineral Research and Exploration, Ankara-Turkey, Serial number: 9, Scale: 1/250.000.
Emre, Ö., Duman, T. Y., Özalp, S. 2011b. Kütahya (NJ35-4) quadrangle, active fault map series of Turkey. General Directorate of Mineral Research and Exploration, Ankara-Turkey, Serial number: 10, Scale: 1/250,000.
Emre, Ö., Duman, T. Y., Özalp, S., Elmacı, H., Olgun, Ş., Şaroğlu, F. 2013. Active fault map of Turkey with an explanatory text 1:1.250.000 scale. General Directorate of Mineral Research and Exploration Special Publication Series 30, Ankara, Turkey. ISBN: 978-605-5310-56-1.
Emre, Ö., Duman, T. Y., Özalp, S., Şaroğlu, F., Olgun, Ş., Elmacı, H., Çan, T. 2018. Active fault database of Turkey. Bulletin of Earthquake Engineering 16, 3229-3275.
Esat, K., Kaypak, B., Işık, V., Ecevitoğlu, B., Seyitoğlu, G. 2016. The Ilıca branch of the southeastern Eskişehir Fault Zone: an active right-lateral strike-slip structure in central Anatolia, Turkey. Bulletin of the Mineral Research and Exploration 152, 25-37.
Imbach, T. 1997. Geology of Mount Uludağ with emphasis on the genesis of the Bursa thermal waters, Northwest Anatolia, Turkey. Schindler, C., Pfister, M. (Ed). Active Tectonics of Northwestern Anatolia- the Marmara Poly-Project. vdf Hochschulverlag AG an der ETH Zurich, 239-266. ISBN 3-7281-2425-7.
Kamacı, Ö., Altunkaynak, Ş. 2019. Cooling and deformation history of the Çataldağ Metamorphic Core Complex (NW, Turkey). Journal of Asian Earth Sciences 172, 279-291.
Kaymakçı, N. 1991. Neotectonic evolution of the İnegöl (Bursa) Basin. MSc Thesis, Middle East Technical University, 73, Ankara (unpublished).
Ketin, İ. 1947. Uludağ masifinin tektoniği hakkında. Türkiye Jeoloji Kurumu Bülteni 1, 60-88.
Ketin, İ. 1984. Türkiye’nin bindirmeli-naplı yapısında yeni gelişmeler ve bir örnek: Uludağ Masifi. Ketin Sempozyumu, 19-36.
Kurt, F. S., Işık, V., Seyitoğlu, G. 2010. Alternative Cenozoic exhumation history of the Kazdağ Core Complex, Western Turkey. Tectonic Crossroads: Evolving Orogens Of Eurasia-Africa-Arabia Abstracts with Programs 36(3), Ankara, 70.
Marrett, R., Allmendinger, R. W. 1990. Kinematic analysis of fault-slip data. Journal of Structural Geology 12, 973-986.
Okay, A. I., Demirbağ, E., Kurt, H., Okay, N., Kuşçu, İ. 1999. An active, deep marine strike-slip basin along the North Anatolian fault in Turkey. Tectonics 18, 129-147.
Okay, A. I., Satır, M., Zattin, M., Cavazza, W., Topuz, G. 2008. An Oligocene ductile strike-slip shear zone: the Uludağ massif, northwestern Turkey - Implications for the westward translation of Anatolia. Bulletin of the Geological Society of America 120, 893-911.
Passchier, C. W., Trouw, R. A. J. 2005. Microtectonics. Springer, ISBN-10: 3-540-64003-7.
Ring, U., Johnson, C., Hetzel, R., Gessner, K. 2003. Tectonic denudation of a late Cretaceous-Tertiary collisional belt: regionally symmetric cooling patterns and their relation to extensional faults in the Anatolide belt of Western Turkey. Geological Magazine 140, 421-441.
Selim, H. H., Tüysüz, O. 2013. The Bursa-Gönen depression, NW Turkey: a complex basin developed on the North Anatolian Fault. Geological Magazine 150, 801-821.
Seyitoğlu, G., Işık, V. 2015. Late Cenozoic extensional tectonics in Western Anatolia: exhumation of the Menderes core complex and formation of related basins. Bulletin of the Mineral Research and Exploration 151, 49-109.
Seyitoğlu, G., Işık, V., Çemen, I. 2004. Complete Tertiary exhumation history of the Menderes Massif, Western Turkey: an alternative working hypothesis. Terra Nova 16, 358-364.
Seyitoğlu, G., Ecevitoğlu, B., Kaypak, B., Güney, Y., Tün, M., Esat, K., Avdan, U., Temel, A., Çabuk, A., Telsiz, S., Uyar Aldaş, G. G. 2015. Determining the main strand of the Eskişehir strike-slip fault zone using subsidiary structures and seismicity: a hypothesis tested by seismic reflection studies. Turkish Journal of Earth Sciences 24, 1-20.
Seyitoğlu, G., Kaypak, B., Aktuğ, B., Gürbüz, E., Esat, K., Gürbüz, A. 2016. A hypothesis for the alternative southern branch of the North Anatolian Fault Zone, Northwest Turkey. Geological Bulletin of Turkey 59, 115-130.
Seyitoğlu, G., Esat, K., Tün, M., Oruç, B., Pekşen, E., Mutlu, S., Balkan, E., Pekkan, E., Çetinkaya, D., Karaarslan, T., Kaypak, B., Çıvgın, B., Aktuğ, B., Kaya, A. M., Ecevitoğlu, B. 2020. Active faults determined by the geological and geophysical methods around Bursa: New findings about the strike-slip faults cross-cutting pull-apart basins. 73rd Geological Congress of Turkey with international participation, Ankara.
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., Cin, A. 1988. Uludağ Napı’nın alt dokanağı boyunca mezoskopik yapısal gözlemler ve napın yerleşme yönü. Türkiye Bilimsel ve Teknik Araştırma Kurumu, Proje No: TBG/824, 55, İstanbul (unpublished).
Şengör, A. M. C., Görür, N., Şaroğlu, F. 1985. Strike-slip deformation basin formation and sedimentation: Strike-slip faulting and related basin formation in zones of tectonic escape: Turkey as a case study. Biddle, K. T., Christie-Blick, N. (Ed). Strike-Slip Faulting and Basin Formation. Society of Economic Paleontologists and Mineralogists Special Publication 37, 227-264.
Topuz, G., Okay, A. I. 2017. Late Eocene-Early Oligocene two-mica granites in NW Turkey (the Uludağ Massif): water-fluxed melting products of a mafic metagreywacke. Lithos 268-271, 334-350.
Türkecan, A., Yurtsever, A. 2002. 1:500.000 scale geological map of Turkey, İstanbul Sheet No:1. General Directorate of Mineral Research and Exploration, Ankara.
Yaltırak, C. 2003. Edremit Körfezi ve kuzeyinin jeodinamik evrimi. Doktora Tezi, Istanbul Teknik Universitesi, 246, Istanbul (unpublished).
Yaltırak, C., Ceyhan, A. 2011. The synchronous geological evolution of the Northwestern Anatolian Core Complexes (Kazdağ and Uludağ) and surrounding region. 64th Geological Congress of Turkey Abstracts with Programs, Ankara, 38-39.
Yıldırım, C., Emre, Ö., Doğan, A. 2005. Bursa ve Uludağ fayları ile Uludağ Masifi’nin neotektonik dönem yükselimi. Eskişehir Fay Zonu ve İlişkili Sistemlerin Depremselliği Çalıştayı, Abstracts with Programs, Eskişehir, 8.
Yılmaz, M., Koral, H. 2007. Neotectonic features and geological development of the Yenişehir basin (Bursa). İstanbul Yerbilimleri Dergisi 20, 21-32.
Yılmaz, Y. 2017. Morphotectonic development of Anatolia and surrounding regions. Çemen, İ., Yılmaz, Y. (Ed). Active global seismology: Neotectonics and earthquake potential of the Eastern Mediterranean region. American Geophysical Union, Geophysical Monograph 225, 11-91.
Yurdagül, A. 2004. Uludağ Granitoyidinin litojeokimyasal incelenmesi. Yüksek Lisans Tezi, Istanbul Üniversitesi, 140, Istanbul (unpublished).