Umut Baris Ülgen

Medithermal Enerji A.Ş.

The westernmost segment of the North Anatolian fault in NW Turkey lies mostly offshore, in the Sea of Marmara and the Gulf of Saros (NE Aegean), respectively to the E and W of a 45 km inland central portion. The 9 August 1912 Mürefte-Şarköy (Ms 7.4) and 13 September 1912 (Ms 6.8) earthquakes occurred along this segment. To date, the segment was stu...

The structure of the central Menderes Massif is controversial with views ranging from an inverted metamorphic sequence to a pile of nappes. Here, we report the results from four deep (>3 km) geothermal wells from the central Menderes Massif. Two distinctive lithological units are differentiated in the wells. The top 0.5 to 1 km of the well sections...

High-resolution seismic reflection profiles and core analyses in Lake Hazar provide a detailed record of the lake level fluctuations and the robust chronology of paleoclimatic events of the Eastern Anatolia during the late Pleistocene to Holocene. The earlier period of Marine Isotope Stage 3 (MIS-3) prior to 48 cal ka BP was accompanied by consider...

Episodic gas seepage occurs at the seafloor in the Gulf of Izmit (Sea of Marmara, NW Turkey) along the submerged segment of the North Anatolian Fault (NAF), which ruptured during the 1999 Mw7.4 Izmit earthquake, and caused tectonic loading of the fault segment in front of the Istanbul metropolitan area. In order to study gas seepage and seismic ene...

New sediment cores were recovered from two sites in the central part of Lake Iznik with the overall aim of reconstructing past environmental conditions of the Marmara region. The composite profile presented here, IZN09/LC2&LC3, encompasses the late Pleistocene to Holocene transition (c. 36 ka cal BP) which is the longest lacustrine record in this r...

Transcontinental dispersal of modern humans from the Near East to the Balkans in the Middle and Upper Palaeolithic is expected to have followed the coastline (i.e., Yarımburgaz, Karain and Üçaǧızlı caves). Lake Iznik is situated 80 km south of the Bosphorus (Western Turkey) close to the Marmara Sea. Here we retrieved a continuous sediment record co...

Magnetic susceptibility, geochemistry, mineralogy and palynology of sediments from Lake Iznik in Northwestern Anatolia, Turkey, provide a 4700 year record of climatic trends and events. The measured proxies allow a reconstruction of variations in humid/dry periods and lake level changes. The Lake Iznik sedimentary sequence points to an oscillating...

The Marmara region is a key area to investigate the interconnection and environmental changes between the Black Sea and the Eastern Mediterranean related to climate patterns. Lake Iznik is an oligohaline lake located in the southeast of the Marmara Sea. To decipher the long-term signals recorded in the sediment column requires better understanding...

The identification of past connection routes between the Black Sea and the Sea of Marmara, other than the traditional one through to the Bosphorus Strait, would be of considerable interest to the international scientific community. Nazik et al. (Geo-Mar Lett 31:75–86 (2011) doi:10.1007/s00367-010-0216-9) suggest the possibility of two alternative w...

İstanbul Strait (Bosphorus) is the only connection of Black Sea to the world ocean via the Sea of Marmara and Çanakkale (Dardannelles) Strait. The İstanbul Strait outlet area of the Black Sea (ISBS) includes the shelf and upper slope areas, and is characterized by the Mediterranean inflow that is responsible for the ventilation and sluggish deep ci...

Lake Van is located on the East Anatolian Plateau of Turkey, which is a key area to obtain long-term regional paleoclimate records. This study is based on the correlation of seismic reflection data acquired by IFM-GEOMAR in 2004 and the borehole stratigraphic information obtained from two sites drilled by International Continental Scientific Drilli...

The Marmara region is a geographical bottleneck for the transcontinental dispersal of modern humans from the Near East to the Balkans. Thus, climate and environmental reconstructions of this key area are of uttermost importance to test hypotheses postulating migration periods influenced directly or indirectly by external forces. Lake Iznik is locat...

The identification of past connection routes between the Black Sea and the Sea of Marmara, other than the traditional one through to the Bosphorus Strait, would be of considerable interest to the international scientific community. Nazik et al. (Geo-Mar Lett 31:75–86 ( 2011 ) doi: 10.1007/s00367-010-0216-9 ) suggest the possibility of two alternati...

We present the results of mineral magnetic measurements (χ, SIRM, ARM, NRM) and geochemical XRF Core Scanner elemental analysis from four cores located in water depths of 60-80 m in different parts of Lake Van, eastern Turkey. Lake Van is the fourth largest terminal Lake in the world by volume (607 km 3). It is 460 m deep and has a salinity of 21.4...

Lake Van is the fourth largest terminal lake in the world (volume 607 km3, area 3570 km2, maximum depth 460 m), extending for 130 km WSW–ENE on the Eastern Anatolian High Plateau, Turkey. The sedimentary record of Lake Van, partly laminated, has the potential to obtain a long and continuous continental sequence that covers several glacial–interglac...

A limnogeological reconnaissance study was carried out on Lake Iznik, located in the southeast of the Marmara region of Turkey, involving a seismic survey and collection of short sediment cores. This lake is located on the middle branch of the North Anatolian Fault Zone (NAFZ), a transform plate boundary between the Eurasian and Anatolian Plates. I...

An Early Miocene (Early Burdigalian) incised valley-fill was produced through development of an alluvial system during active extension and block rotation in the Mut Basin. Five phases of alluvial activity have been recognized and are linked to specific tectono-stratigraphic factors. The entrenchment phase (phase 1) was a response to a rapid decrea...

Northern Aegean represents the northern strand of the Neotethys which started to close in late Kreatase-Early Paleocene. The basement consists of Early Paleocene limestones and serpantinite olistoliths which are formed by the breake up of the mélange. The basement is covered by Early Eocene rocks which are deposited unconformable in the front of th...

The Lake Iznik with it's 313 km 2 areal coverage and maximum depth of 73 m is the biggest lake in the Marmara region. It's located in the Bursa province, approx. 100 km southeast from Istanbul. Because of it's position on one of the active branches of the North Anatolian Fault (NAF), a plate boundary between the European plate in the north and the...

Many studies about defining formations have been done in the Gelibolu Peninsula in the recent years. Our study and the recent ones showed that nearly 20 different environments can be derived from Gokceada and Gelibolu, such as turbidities, deltas, lacustrine, braided rivers, reefs, dunes. In the Gelibolu Peninsula, late Cretaceous ophiolitic mélang...

Pleistocene raised coastal deposits characterized by locally abundant shells, aragonite-cemented beachrock and associated nearshore deposits border the western Marmara Sea at elevations of 0–50 m. Field observations confirm that these deposits formed during a series of transgressive and regressive events. U/Th dates in 16 in situ shells from four l...