Geomorphological Features of Marmara Sea Islands
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ISSN: 2148-9173 Vol: 6 Issue:1 April 2019 International Journal of Environment and Geoinformatics (IJEGEO) is an international, multidisciplinary, peer reviewed, open access journal. Geomorphological features of Marmara Sea Islands Hakan KAYA Chief in Editor Prof. Dr. Cem Gazioğlu Co-Editor Prof. Dr. Dursun Zafer Şeker, Prof. Dr. Şinasi Kaya, Prof. Dr. Ayşegül Tanık and Assist. Prof. Dr. Volkan Demir Editorial Committee (2019) Assos. Prof. Dr. Abdullah Aksu (TR), Prof. Dr. Bedri Alpar (TR), Prof. Dr. Lale Balas (TR), Prof. Dr. Levent Bat (TR), Prof. Dr. Paul Bates (UK), Prof. Dr. Bülent Bayram (TR), Prof. Dr. Luis M. Botana (ES), Prof. Dr. Nuray Çağlar (TR), Prof. Dr. Sukanta Dash (IN), Dr. Soofia T. Elias (UK), Prof. Dr. A. Evren Erginal (TR), Assoc. Prof. Dr. Cüneyt Erenoğlu (TR), Dr. Dieter Fritsch (DE), Assos. Prof. Dr. Çiğdem Göksel (TR), Prof.Dr. Lena Halounova (CZ), Dr. Hakan Kaya (TR), Assoc. Prof. Dr. Maged Marghany (MY), Prof. Dr. Michael Meadows (ZA), Prof. Dr. Nebiye Musaoğlu (TR), Prof. Dr. Erhan Mutlu (TR), Prof. Dr. Masafumi Nakagawa (JP), Prof. Dr. Hasan Özdemir (TR), Prof.Dr. Chryssy Potsiou (GR), Prof. Dr. Erol Sarı (TR), Prof. Dr. Maria Paradiso (IT), Prof. Dr. Petros Patias (GR), Prof. Dr. Elif Sertel (TR), Prof. Dr. Nüket Sivri (TR), Assoc. Prof. Dr. Füsun Balık Şanlı (TR), Prof. Dr. Uğur Şanlı (TR), Assoc. Prof. Dr. Oral Yağcı (US), Prof. Dr. Seyfettin Taş (TR), Assoc. Prof. Dr. Ömer Suat Taşkın (TR), Dr. İnese Varna (LV), Dr. Petra Visser (NL), Prof. Dr. Selma Ünlü (TR), Assoc. Prof. Dr. İ. Noyan Yılmaz (AU), Prof. Dr. Murat Yakar (TR), Assit. Prof. Dr. Sibel Zeki (TR) Abstracting and Indexing: DOAJ, Index Copernicus, OAJI, Scientific Indexing Services, JF, Google Scholar International Journal of Environment and Geoinformatics 6(1): 57-66 (2019) Reaserch Article Geomorphological features of Marmara Sea Islands Hakan Kaya Istanbul University, Institute of Marine Sciences and Management, 34134 VEFA Fatih Istanbul TR Received 28 Feb 2019 E-mail:[email protected] Accepted 26 March 2019 How to cite: Kaya, H.(2019). Geomorphological features of Sea of Marmara Islands, International Journal of Environment and Geoinformatics (IJEGEO), 6(1): 57-66. DOI: 10.30897/ijegeo.533694 Abstract The Sea of Marmara is located on a continental crust. The Sea of Marmara, which is a remnant of the Sarmasien period of the Miocene Sea, is an inland sea (Okay, 2007). It opens to the Black Sea with the Bosphorus and the Aegean Sea with the Dardanelles. Its surface area is 11 111 km2 (Gazioğlu, et al., 2002) and its average depth ranges from -200 to -500 m (Doğanay, 1997). At the end of the third time, and at the beginning of the fourth time, there were crumbs and crashes arising from the earth crust movements in and around, where this sea lies today (İzbırak, 1996). In the Marmara Sea, the oldest sediments were deposited as a result of the transformation of the Marmara Sea from a lacustrine environment to a marine environment with the Mediterranean Tyrenian transgression at the end of Middle Pleistocene. When the sea level in the Sea of Marmara is at the same or higher than the present day, water passage from the Black Sea has occurred. At the beginning of Late Pleistocene, as a result of a sudden drop in world sea level, the water passage from the Marmara Sea to the Mediterranean was cut and the marine sedimentation environment was replaced by lacustrine sedimentation. At the beginning of Late Pleistocene (between 64.000-59.000 BC), Mediterranean waters entered the Sea of Marmara and the Black Sea with the sudden rise of sea level (Algan, et al., 2011 ). After the transgression, the gulfs and islands in the Sea of Marmara were formed. Keywords: Sea of Marmara Islands, Marmara, Avşa, Paşalimanı, Büyükada, Heybeliada Introduction The Sea of Marmara is an inland sea in NW Anatolia, Mediterranean waters entered the Sea of Marmara and which is located between the Aegean Sea in the south the Black Sea with the sudden rise of sea level (Algan et and the Black Sea in the north. It has a surface area of 11 al., 2011; Gazioğlu et al., 2010). After the transgression, 110 km2 (max. 280 km. long, max. 80 km. wide) and the gulfs and islands in the Sea of Marmara were formed. lies along east-west direction. It has broad shelf in the The Sea of Marmara can be considered in two groups south (38% proportion to total Sea of Marmara area and regarding its islands. Northern Marmara and South 69% proportion to shelves) and narrower shelf in the Marmara islands. South Marmara islands are; Marmara north area (17% proportion to total Sea of Marmara area Island (117.2 km2), Paşalimanı Island (21.4 km2), Avşa and 31% proportion to shelves). Shelf area has a largest Island (20.6 km2), Koyun, Ekinlik, Yer, Mamalı, proportion among the other morphologic units in the Sea Tavşan, Fener, (Asmalı), Hayırsız, Haliada, Eşek Islands of Marmara (Gazioğlu, et al., 2002; 2017). The E–W- of Balıkesir Province, and İmralı Island (9.98 km2) of oriented basin chain between the Gulf of zmit and the İ Bursa. North Marmara Islands are Büyükada (5.4 km2), Ganos Mountain System is called here the "Marmara Heybeliada (2.5 km2), Burgaz (1.5 km2), Eşek, Sedef, Trough". The four basins are separated by ridges Pide (Kaşık), Kınalıada, Sivriada, and Yassıada constituted in the E-W direction of Marmara Trough (Doğanay, 1997). In this study, physical geography which coincides with the northern branch of the North features of these islands were analysed. Anatolian Fault Zone (NAFZ) (Gazioğlu, et al., 2005; 2014; 2016). Geological Evolution In the Sea of Marmara, the oldest sediments The Sea of Marmara is located in a geologically complex were deposited as a result of the transformation of the area. The formation of the Sea of Marmara, which is Sea of Marmara from a lacustrine environment to a much younger than the Black Sea and the Mediterranean marine environment with the Mediterranean Sea, began with the arrival of the North Anatolian Fault Tyrenian transgression at the end of Middle in the Miocene - Pliocene. The Sea of Marmara consists Pleistocene. When the sea level in the Sea of Marmara of three pits with a depth exceeding one thousand meters is at the same or higher than the present day, water and shelves surrounding these pits. These deep pits are passage from the Black Sea has occurred. At the also basins with Plio-Quaternary sedimentations with a beginning of Late Pleistocene, as a result of a sudden thickness of several kilometers. The pits of the Sea of drop in world sea level, the water passage from the Marmara are deepening and filling grabens due to the Sea of Marmara to the Mediterranean was cut and the movement of the North Anatolian Fault which cuts marine sedimentation environment was replaced by across the Sea of Marmara (Doğanay, 1997; Kaya & lacustrine sedimentation. At the beginning of Late Gazioğlu, 2015). The very narrow northern shelf of the Pleistocene (between 64.000-59.000 BC), 57 Kaya / IJEGEO (6)1: 57-66 (2019) Sea of Marmara is rising due to the movements of the years ago (Görür et al., 1997; Sakınç et al., 1999; Kaya North Anatolian Fault. The much larger southern shelf is et al., 2008; Burak et al., 2009). The Sea of Marmara had shaped by normal faults. Elevations such as Marmara been a terrestrial area covered with lakes and rivers. Island and Kapıdağ form the base blocks of active Following the arrival of the North Anatolian Fault in the normal faults. The Sea of Marmara is a very young region, the basins were formed as a result of the vertical geological area that is formed by the effect of the North movements along the fault, and the Sea of Marmara Anatolian Fault. Although the formation of the Black (Okay, 2007; Gökaşan eta l., 2001; İsmail & Gazioğlu, Sea and the Eastern Mediterranean reaches 80 million 2019) was formed as a result of the invasion of those years ago, Sea of Marmara is not present 10 million basins by the sea. Sea of Marmara Figure 1. Study Areas. Geological Features Sedef Island and in the Northeast of Büyükada. In the south of the Büyükada, there is the Kartal member of the Northern Marmara Islands that have been formed in a Pendik formation, which consists of limestones with large time interval from the early Paleozoic to the limestone inter-bedded with mica scaly, clay-mile and present, covers a large number of rock-stratigraphy units thin clastic rocks. Another formation observed at the (İ.B.B, 2009). However, Büyükada is very diverse in southwest of Büyükada is the Denizli Village Formation. geologically. This formation consists of limestone, clayey limestone, nodular limestone, and lidites. In some places, there is The most common observed formation in the islands is inter-bedded thin shale. Slope debris is frequently Kınalıada Formation. This formation consists of encountered on the slopes of the high sections of the sandstone - milestone with feldspar. The whole of northern Marmara islands. Especially east and north- Kinaliada and Burgazada and the major part of facing slopes of Kınalıada there is debris fan that has Heybeliada and the northern half of the Büyükada is been developed starting from the sea coast, reaching up composed of this formation. The Aydos Formation, to 40-50 m altitudes, becoming steeper as ascending which is composed of quartzites, has been distributed in down, and reaching the thickness of 20-30 m (Özgül, the high sections in the southern part of Büyükada. 2011; İ.BB, 2009).