Universität zu Köln

Gromig, Raphael, Mechernich, Silke ORCID: 0000-0003-3684-040X, Ribolini, Adriano ORCID: 0000-0001-5851-8775, Wagner, Bernd ORCID: 0000-0002-1369-7893, Zanchetta, Giovanni, Isola, Ilaria ORCID: 0000-0002-3911-4676, Bini, Monica and Dunai, Tibor J. (2018). Evidence for a Younger Dryas deglaciation in the Galicica Mountains (FYROM) from cosmogenic Cl-36. Quat. Int., 464. S. 352 - 364. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1873-4553

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Abstract

This study presents the first cosmogenic Cl-36 surface exposure data from a moraine in the Former Yugoslav Republic of Macedonia (FYROM). Five limestone boulders from an end moraine in the Galicica Mountains (40.94 degrees N, 20.83 degrees E, 2050 m a.s.l.) were used for cosmogenic Cl-36 surface exposure dating. The Cl-36 concentrations from the five boulders are identical within their measurement uncertainties ruling out major effects of inheritance, erosion, or snow cover. The calculated ages are very consistent ranging from 11.3 +/- 1.3 to 12.8 +/- 1.4 ka (mean 12 +/- 0.6 ka) after applying a Ca-spallation production rate of 56 at g(-1) a(-1) (LSD scaling) and correction for 5 mm ka(-1) carbonate weathering and 2% snow shielding. The applied corrections for weathering and snow shielding cause a shift to older ages in the order of magnitude of ca. 5% on average, making the production rate the main impact on exposure ages. The ages point to a moraine formation during the Younger Dryas period, consistent with the timing of the last deglaciation in the Galicica Mountains derived from previous geomorphological studies in the area. The formation of a glacier was likely favoured by several topoclimatic factors, accounting for additional snow input. This interpretation is in line with regional studies on glaciation chronologies from Sara Range (FYROM/Republic of Kosovo), Retezat Mountains (Romania), Mt. Chelmos (Greece), Mount Orjen (Montenegro) and Durmitor (Montenegro). Lake sediment analyses of Prespa (Republic of Albania/FYROM/Greece), Maliq (Republic of Albania) and Dojran lakes (FYROM/Greece) indicate that cold conditions promoted the formation of a local cirque glacier. However, studies of sediment records of the adjacent lakes Ohrid (Republic of Albania/FYROM) and Prespa do not indicate the presence of a proximal glaciation. An explanation might be a combination of the small size of the cirque glacier, generating only small amounts of debris, and the karstic bedrock, which hampers fluvial transport and acts by its aquifer system as a natural sediment trap, as the fluvial transport of the sediments to the lakes is absorbed by the karst system. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gromig, Raphael UNSPECIFIED UNSPECIFIED UNSPECIFIED Mechernich, Silke UNSPECIFIED orcid.org/0000-0003-3684-040X UNSPECIFIED Ribolini, Adriano UNSPECIFIED orcid.org/0000-0001-5851-8775 UNSPECIFIED Wagner, Bernd UNSPECIFIED orcid.org/0000-0002-1369-7893 UNSPECIFIED Zanchetta, Giovanni UNSPECIFIED UNSPECIFIED UNSPECIFIED Isola, Ilaria UNSPECIFIED orcid.org/0000-0002-3911-4676 UNSPECIFIED Bini, Monica UNSPECIFIED UNSPECIFIED UNSPECIFIED Dunai, Tibor J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-198774
DOI:	10.1016/j.quaint.2017.07.013
Journal or Publication Title:	Quat. Int.
Volume:	464
Page Range:	S. 352 - 364
Date:	2018
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1873-4553
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LAST GLACIAL MAXIMUM; LATE PLEISTOCENE GLACIERS; ENVIRONMENTAL-CHANGE; INTERGLACIAL CYCLE; MIDDLE PLEISTOCENE; HOLOCENE CLIMATE; EXPOSURE AGES; COLD STAGE; RECORD; PRESPA Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19877