 |
| Titel |
Hummocky moraines of piedmont glaciers from Geyikdağ, Central Tauride Mountains, Turkey; insights from cosmogenic 36Cl dating |
| VerfasserIn |
Attila Çiner, Mehmet Akif Sarıkaya, Cengiz Yıldırım |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090060
|
| Publikation (Nr.) |
 EGU/EGU2014-4274.pdf |
|
|
|
|
|
| Zusammenfassung |
| For the first time we report the presence of Late Quaternary piedmont glaciers represented by
the largest hummocky moraine field in Turkey. The piedmont glaciers developed in the
Central Taurides, 50 km north of the Mediterranean Sea. They were located on
the north-facing hill-slopes of the Namaras Valley situated around 2000-2050 m
above sea-level (a.s.l) in Geyikdağ. The hummocky moraines resulted from in situ
deposition of stagnant glacier ice (or dead-ice) where debris cover was heterogeneously
distributed on the glacier surface. Twenty-six boulders from hummocky, lateral
and terminal moraines from the Namaras Valley and the tributary Susam Valley
were dated by cosmogenic 36Cl surface exposure dating. The moraine ages indicate
three phases of glacial advances during the Late Quaternary. The oldest glacial
advance occurred in the Namaras Valley at the end of the Last Glacial Maximum
(18.0±0.4 ka, ka: thousands years ago) and is recorded entirely by the sequence of
hummocky moraines in the mountain. Glaciers retreated towards the Susam Valley
(2100-2200 m a.s.l.) and became stagnant during the Late Glacial (14.3±1.3 ka) as
observed from hummocky and terminal moraines at the interior and outlet of the
valley. Glaciers re-advanced at around 11.5±1.0 ka ago (Younger Dryas) which
is represented by several lateral moraines that are at least 50 m higher than the
surrounding hummocky moraines in both valleys. Comparable glacial chronologies were
obtained from other Turkish mountains and from other Mediterranean mountains. |
|
|
|
|
|
|