Cosmogenic exposure dating of snow-avalanche ridges Eastern Black Sea Mountains, NE Turkey

Akçar, Naki; Yavuz, Vural; Ivy‐Ochs, Susan; Kubik, Peter W.; Vardar, Mahir; Schlüchter, Christian

doi:10.1016/j.quaint.2006.11.011

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…In a recent study (Akçar et al, 2007b), it was shown that the previously mapped terminal moraine (Erinç, 1944(Erinç, , 1949a(Erinç, , 1949b; Lö ffler, 1970; Dogu et al, 1993Dogu et al, , 1996 of this palaeoglacier is actually a snow-avalanche ridge. In the Verçenik valley, the maximum extent of the palaeoglacier is represented by erratic boulders on the western slope in the lower part of the valley.…”

Section: Interpretation Of the Exposure Agesmentioning

confidence: 97%

“…The glacial erosional features observed were mapped in the field and were used to construct the flow directions of palaeoglaciers in the Verçenik valley. In the Verçenik valley system, Quaternary deposits include moraines, moraine bastions, snow-avalanche ridges (Akçar et al, 2007b), rock glaciers, alluvial plain and alluvial fan deposits. The U-shaped morphology can be traced down to an altitude of 1900 m and comprises a main valley and five tributary valleys (Fig.…”

Section: Introductionmentioning

confidence: 99%

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A case for a downwasting mountain glacier during Termination I, Verçenik valley, northeastern Turkey

Akçar

Yavuz

Ivy‐Ochs

et al. 2007

J Quaternary Science

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Field evidence of palaeoglacial records in the Verçenik valley in the Eastern Black Sea Mountains was examined and 19 samples for surface exposure dating with cosmogenic 10Be were collected with the aim of increasing knowledge on the amplitude and frequency of palaeoglacier advances in Anatolia. Glacial erosional features were mapped and the flow directions of the palaeoglaciers were determined. The Verçenik palaeoglacier advanced before 26.1 k ± 1.2 k yr. The Last Glacial Maximum (LGM) advance continued until 18.8 k ±1.0 k yr. The Verçenik palaeoglacier collapsed during Termination I. After 17.7 k ± 0.8 k yr there was no more ice in the main valley. The Verçenik palaeoglacier most probably then separated into five small glaciers that were restricted to the tributary valleys. Among these, the Hemşin palaeoglacier completed its recession around 15.7 k ± 0.8 k yr. On the basis of glacial erosion features, a Lateglacial glacier advance can be identified. Evidence of the Little Ice Age advance appears to be absent. The results from this valley system seem to be consistent with the first results from the adjacent Kavron valley and with the Anatolian LGM palaeoclimate, the sea surface temperature minima in the western Mediterranean, the deposition of red clay layers in the Black Sea and deposition of the Heinrich‐1 layer in the North Atlantic. Copyright © 2007 John Wiley & Sons, Ltd.

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Section: Interpretation Of the Exposure Agesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

A case for a downwasting mountain glacier during Termination I, Verçenik valley, northeastern Turkey

Akçar

Yavuz

Ivy‐Ochs

et al. 2007

J Quaternary Science

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“…Enormous amounts of snow must have accumulated during the LGM, as even today, snow avalanche ridges are actively formed in the valley, cf. Akçar et al [50]. Such processes clean the high slopes from all glacigenic "horizontal" sedimentary landforms such as moraine ridges or ice contact slopes.…”

Section: Discussionmentioning

confidence: 99%

LGM Glaciations in the Northeastern Anatolian Mountains: New Insights

et al. 2022

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Barhal Valley belongs to the Çoruh Valley System in the Kaçkar Mountains of northeastern Anatolia. This 13 km long valley is located to the south of the main weather divide and to the east of Mt. Kaçkar, with the highest peak of the mountain range being 3932 m. Today, source of an average yearly precipitation of 2000 mm of moisture is the Black Sea, situated approximately 40 km to the north of the study site. Glaciers of the Last Glacial Maximum (LGM) descended directly from Mt. Kaçkar and reached an altitude of ca. 1850 m a.s.l. (above sea level). In this study, we are exploring whether the position of Barhal Valley to the south of the main weather divide and its east–west orientation have an influence on the existence and expansion of paleoglaciers. Here, we present 32 new cosmogenic 36Cl dates on erratic boulders from the Çoruh Valley System. We reconstructed three geomorphologically well-contained glacier advances in the Barhal Valley, namely at 34.0 ± 2.3 ka, 22.2 ± 2.6 ka, and 18.3 ± 1.7 ka within the time window of the global LGM. Field evidence shows that the glacier of the 18.3 ± 1.7 ka advance disappeared rapidly and that by the latest time, at 15.6 ± 1.8 ka, the upper cirques were ice-free. No evidence for Lateglacial glacier fluctuations was found, and the Neoglacial activity is restricted to the cirques with rock glaciers. A range of 2700 to 3000 m for the Equilibrium Line Altitude (ELA) at the LGM was reported based on modeling of the glacial morphology. We determined that the most likely position of the LGM ELA in the Çoruh Valley System was at 2900 m a.s.l. We suggest an alternative moisture source to the direct transport from the Black Sea for the ice accumulation in the Eastern Black See Mountains. The shift of the Polar Front and of the Siberian High Pressure System to the south during the LGM resulted in the domination of easterly airflow to the Caucasus and Kaçkar Mountains with moisture from expanded lakes in central–western Siberia and from the enlarged Aral- and Caspian Seas.

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The Anatolian Peninsula

Akçar¹

2022

European Glacial Landscapes

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Cosmogenic exposure dating of snow-avalanche ridges Eastern Black Sea Mountains, NE Turkey

Cited by 8 publications

References 13 publications

A case for a downwasting mountain glacier during Termination I, Verçenik valley, northeastern Turkey

A case for a downwasting mountain glacier during Termination I, Verçenik valley, northeastern Turkey

LGM Glaciations in the Northeastern Anatolian Mountains: New Insights

The Anatolian Peninsula

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