Browsing by Author "Köse, O"

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    Late pleistocene cosmogenic 36Cl clacial geochronology and PISM ice flow model of the Central Taurus Range, Turkey
    (International Union for Quaternary Research (INQUA), 2019-07-28) Köse, O; Sarıkaya, MA; Çiner, A; Yildirim, C; Candaş, K; Wilcken, KM
    The glacial geochronology of the Taurus Mountain Range is well-studied thanks to several works that use quantitative methods. Here, we report the timing of deglaciations in the central part of the Taurus Range, in the Mount Karanfil and Aladağlar during the Late Pleistocene. In the light of terrestrial cosmogenic nuclide 36Cl surface exposure ages and glacial geomorphology, we use the Parallel Ice Sheet Model (PISM) to model Last Glacial Maximum (LGM-20 ka) cycle in central Taurus Range. Aladağlar Massif, covers an area of 800 km2, composed mainly of Mesozoic carbonate rocks and shows the evidence of Late Pleistocene glaciations. We carefully carried out glacial geomorphological map of Aladağlar and Karanfil mountains and collected moraine boulder samples for cosmogenic 36Cl surface exposure dating. We collected 21 samples from Karanfil Mountains and 39 from Aladağlar to assess the timing of paleoglaciations. The ages obtained from W-NW-facing Körmenlik Valley indicate a deglaciation starting from ca. 35.000 years (35 ka) in Aladağlar which give substantial evidence regarding ice accumulation before the global LGM. Moraines of ca. 20 ka in age are observed in higher altitudes in Aladağlar and Mount Karanfil. Late Glacial (ca. 15 ka) moraine ages are also well established from Maden Valley. We also present preliminary field observations as 13 samples are still in progress from Eastern Valleys of Aladağlar. The results from the NW-facing valleys in Mount Karanfil indicate deglaciation starting during local Last Glacial Maximum (LGM), ca. 19 ka. Late Glacial (ca. 15 ka) moraine ages are also well established in Mount Karanfil. Additionally, a rock glacier at ca. 2500 m was dated to early Holocene (ca. 11 ka) indicating periglacial conditions in this mountain. The moraine and rock glacier ages are first dates obtained from this part of the Taurus Range, which is compatible with the glacial chronology of southern Turkey and surrounding regions. In order to obtain glacial conditions of the past, we used simulations of nine conditions, in Mount Karanfil, with open-source PISM, which necessitates 9°C decrease in air temperatures and 25% more precipitation compared to today’s conditions. This work was supported by TÜBİTAK 116Y155 project.
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    Late pleistocene cosmogenic 36Cl glacial chronology of the Mount Karanfil, Central Taurus Range, Turkey
    (American Geophysical Union, 2018-12-14) Çiner, A; Köse, O; Sarikaya, MA; Yildirim, C; Candaş, A; Wilcken, KM
    The glacial chronology of the Taurus Mountain Range of Turkey is probably one of the best studied in the world thanks to several works and publications that use quantitative methods during the last decade. Here, we report the timing of deglaciations during the late Pleistocene in the Mount Karanfil (37.36oN, 35.03oE, 3026 m) in the central Taurus Range. Glaciers that originated from N-NW facing cirques at ca. 2500 m asl, deposited lateral, hummocky and terminal moraines that reach down to 2100 m asl. We dated the limestone boulders from these moraines by terrestrial cosmogenic nuclide 36Cl surface exposure method. A total of 20 boulder ages indicate up to 3 phases of deglaciation during the late Pleistocene. Three glaciers that deposited well-developed lateral moraines ca. 1.5 km long and up to 50 m high, yield an average mean age of ∼20 ka corresponding to the local Last Glacial Maximum (LGM). Another moraine, at slightly higher elevations, testifies to the presence of Late Glacial (∼15 ka) in the Mount Karanfil. Finally, a lower cirque moraine, in contact with the upper parts of the Late Glacial moraines at ∼2200 m asl, yielded an age of 10.5 ± 1.0 ka, which indicates that glaciers totally disappeared at the onset of Holocene. A rock glacier at ca. 2500 m was also dated to early Holocene (11.5 ± 1.1 ka) indicating that in early Holocene periglacial conditions dominated in the area. The moraine and rock glacier ages are first dates obtained from this part of the Taurus Range and are compatible with glacial chronology of the southern Turkey and surrounding regions.