Glacier advances in northeastern Turkey before and during the global Last Glacial Maximum

Reber, Regina; Akçar, Naki; Yesilyurt, Serdar; Yavuz, Vural; Tikhomirov, Dmitry; Kubik, Peter W.; Schlüchter, Christian (2014). Glacier advances in northeastern Turkey before and during the global Last Glacial Maximum. Quaternary Science Reviews, 101, pp. 177-192. Pergamon 10.1016/j.quascirev.2014.07.014

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Abstract Our study in the Başyayla Valley in northeastern Anatolia showed evidence of four glacier advances that built terminal and lateral moraines. Surface exposure dating of boulders on these moraines showed that the Maximum Ice Extent (MIE) was asynchronous with the global Last Glacial Maximum (LGM; 22.1 ± 4.3 thousand years; ka). The local {MIE} took place at least 57.0 ± 3.5 ka ago. The extent of the Başyayla Glacier during this advance is not known exactly because the boulders are only preserved on a lateral moraine. The next advance was prior to 41.5 ± 2.5 ka, and it descended down the valley to approximately 2320 m above sea level (m a.s.l.), with a glacier length of 5.3 km. During the early global LGM, the Başyayla Glacier extended for a distance of 4.9 km down to approx. 2430 m a.s.l. The last recorded advance occurred during the global LGM. This extension was 0.7 km smaller than the local {MIE} and its terminus reached 2490 m a.s.l. only. The exposure ages of boulders in a retreat position at an altitude of approx. 3045 m a.s.l. indicate that the valley has remained ice-free since the Lateglacial period. Therefore, the Lateglacial extent was limited to the cirque system in the uppermost part of the catchment. Furthermore, Holocene glacier oscillations seem to be either absent or restricted to solifluction in the whole catchment and to rock glacier movements in the southern tributary of the Başyayla Valley system.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology
08 Faculty of Science > Institute of Geological Sciences > Exogenous Geology

UniBE Contributor:

Reber, Regina; Akçar, Naki; Yesilyurt, Serdar and Tikhomirov, Dmitry

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0277-3791

Publisher:

Pergamon

Language:

English

Submitter:

Regina Reber

Date Deposited:

29 Jul 2015 11:05

Last Modified:

26 Jun 2016 02:06

Publisher DOI:

10.1016/j.quascirev.2014.07.014

Uncontrolled Keywords:

Most extensive glaciation

BORIS DOI:

10.7892/boris.70558

URI:

https://boris.unibe.ch/id/eprint/70558

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