Browsing by Author "Dogu, Ali Fuat"

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Glacial Landscape and Old-Growth Forests of the Mount Kackar National Park (Eastern Black Sea Region)
(Springer international Publishing Ag, 2019) Cicek, Ihsan; Gurgen, Gurcan; Tuncel, Harun; Dogu, Ali Fuat; Kurdoglu, Oguz
The Eastern Black Sea Mountains were substantially glaciated owing to the suitable geomorphological-climatological conditions during the Pleistocene. Glacial landscapes occur in valleys higher than 1800-2000 m a.s.l. The altitude of the Pleistocene climatic permanent snowline in the region is 2600 m a.s.l. The mountainous area is important for Turkey owing to six glaciers still present in these highlands. Today the glacier line in the area of Mount Kackar National Park is approximately 3000-3100 m a.s.l. Evidence of four glacier advances was found in the Basyayla Valley within Mount Kackar National Park area. Kavran Valley lies in the Kackar Mountain and is a N-S-oriented, typically U-shaped glacial valley consisting of a main and three tributary valleys. According to the Be-10 ages, the advance of the Kavran Paleoglacier began at least 26.0 +/- 1.2 ka ago, with the Last Glacial Maximum advance continuing until 18.3 +/- 0.9 ka. In the area, there are 10 villages and 35 yaylas. All houses are built with stone and wood. The traditional activities of the population focus on animal husbandry, with a seasonal organization characterized by summer pasturing in the high sections of the mountains. In the National Park, approximately 13000 cattle and sheep migrate seasonally between village and yaylas, while honey production is another significant activity. On the other hand, the region provides exciting activities such as glacier and rock climbing, trekking, heli-skiing and nature photography, which attract foreign and domestic tourists.
Obsidian Outcrops From Nemrut Volcano (Eastern Anatolia): Evidence in Favor of an Exploitable Source, First Results
(Groupe Francias Geomorphologie, 2015) Robin, Anne-Kyria; Mouralis, Damase; Kuzucuoglu, Catherine; Akkopru, Ebru; Gratuze, Bernard; Dogu, Ali Fuat; Cetoute, Joel
Archeological studies have demonstrated that many Prehistoric artefacts in obsidian found in the Near East have a chemical affinity with obsidian out-cropping in the Nemrut volcano. In the archaeological literature, Mount Nemrut is considered as one of the most important obsidian sources used by prehistoric societies. During our two field works in 2013 and 2014, we prospected a wide area on and around Nemrut volcano. Our findings confirm the location of the obsidian outcrops described in the literature. According to our observation, obsidian on Mount Nemrut volcano is generally not exploitable for chopping tools. Most of the studied obsidians we defined on the field, present a facies with numerous phenocrysts and cracks, which is not compatible with a good knapping quality. However, we identified a new outcrop associated with obsidian artefacts such as nuclei and rough flakes. Geological samples of the obsidian from this outcrop present all a very different fades compare to those of others Mount Nemrut obsidians: obsidian from this area does not show any phenocryst or cracks, and they are very homogeneous and uniform. These characteristics are in favor to knapping criteria. Comparatively to the other known obsidian outcrops in the Nemrut volcano, we can assume here that this obsidian outcrop is, to date, the only source one that could have been exploited, by Prehistoric people on the Nemrut volcano. Our work, using chemical analyzes (LA-ICP-MS), petrology and field observation enhances characteristics for workable obsidian that depends on the modality of emplacement. This last one should have been different from the other outcrops to provide a different facies.
Pleistocene Glacier Heritage and Present-Day Glaciers in the Southeastern Taurus (Ihtiyar Sahap Mountains)
(Springer international Publishing Ag, 2019) Dogu, Ali Fuat
Contemporary and past glacial landforms are common in the higher sections of Turkish mountains. The Eastern Black Sea Mountains, the Taurus, and individual high mountains in Central and Eastern Anatolia contain glacier landforms and landscapes, hosting also actual glaciers. The high mountainous landscapes of these regions are deeply marked by the influence of intense glaciation that occurred approximately 20,000 years ago. These landscapes owe much to karstic processes too. In Eastern Anatolia (Southeastern Taurus), glacier morphological heritage from the Last Glacial and contemporary glaciers concentrates in two main ranges. The first one, located in the Southeastern Turkey between Iraqi and Iranian borders, includes the Buzul (Cilo glaciers) and Ikiyaka (Sat glaciers) Mountains. The second one, located to the south of Lake Van, is the Ihtiyar Sahap Mountains. Compared to the Buzul and Ikiyaka Mountains where contemporary glaciers still cover relatively large areas, glaciers in the Ihtiyar Sahap Mountains are much smaller. In the Ihtiyar Sahap Mountains, the permanent Last Glacial Maximum (LGM) snowline was 2700 m above sea level (a.s.l.). Today, the snowline has risen so high (3200-3300 m a.s.l.) that young moraine deposits and rock glaciers now cover the cirques of the melting glaciers.
The Pyroclastites Around Southwestern Part of Van Lake (Eatern Anatolia, Turquey): Implications on The Regional Palaeohydrography
(Soc Geologique France, 2010) Mouralis, Damase; Kuzucuoglu, Catherine; Akkopru, Ebbru; Dogu, Ali Fuat; Scaillet, Stephane; Christol, Aurelien; Guillou, Herve
THE PYROCLASTITES AROUND SOUTHWESTERN PART OF VAN LAKE (EATERN ANATOLIA, TURQUEY): IMPLICATIONS ON THE REGIONAL PALAEOHYDROGRAPHY Located in eastern Anatolia (Turkey), Lake Van is the fourth largest lake in the world. Along the banks of the lake, several lake terraces record Pleistocene variations of the lake levels. In the terraces, the lake deposits are often interbedded with pyroclastites emitted by the volcanoes located on the northern side of the lake. Our research focuses on the south-western part of the lake, where several pyroclastites interbedded with lake deposits allow establishing a regional tephrostratigraphy, which is being Ar/Ar dated. In this area, the study of the pyroclastites allows to understand the impact of volcanism on the palaeohydrography: all the valleys where filled-in with pyroclastites which induced heavy disruptions of the drainage network. Moreover, our research enlightens evidences that volcanic activity was responsible for the enclosure of the lake and that the major transgression of the lake, dated ca. 100 ka, is not only linked to changes in the water balance, but at first linked to volcanic activity.