First 36 Cl cosmogenic moraine geochronology of the Dinaric mountain karst: Velež and Crvanj Mountains of Bosnia and Herzegovina

M. Žebre*, M. A. Sarıkaya, U. Stepišnik, C. Yıldırım, A. Çiner

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name???Makalebilirkişi

33 Atıf (Scopus)

Özet

This article presents the first attempt to date moraines in the Dinaric mountain karst using cosmogenic 36 Cl surface exposure dating technique. Twenty samples were collected from moraine boulders from two sets of the lowest and largest lateral moraines on the Velež (1965 m asl) and Crvanj mountains (1920 m asl) in Bosnia and Herzegovina. The dated lateral-terminal moraine complexes, spanning elevations from ∼980 to 1350 m asl, are up to 2.7 km long and rise more than 100 m above the valley floor. The moraine boulders yielded 36 Cl ages spanning from Oldest Dryas for Velež (14.9 ± 1.1 ka) to Younger Dryas for Crvanj (11.9 ± 0.9 ka), considering the average age of the two oldest samples from each lateral moraine as the most representative time of moraine emplacement. The dated moraines mark the largest extent of glaciers in both study areas, which have been reconstructed to ∼28 km 2 for Velež and ∼24 km 2 for Crvanj, having a mean equilibrium line altitude at 1388 m and 1541 m, respectively. Under modern precipitation values, which account for ∼2000 mm, the temperature depression between 8 and 10 °C is required to sustain the palaeoglaciers with reconstructed equilibrium line altitudes. Glaciers of similar size with such low equilibrium line altitudes during the Lateglacial have not been reported until now for the Balkan Peninsula. It is very likely that the boulder ages reflect complex exhumation and denudation histories, which at this point do not allow obtaining more precise moraine chronologies for the study areas. Nevertheless, this article delivers new data on the extent and timing of Quaternary glaciations in the Mediterranean mountains, where records of glacier fluctuations seem to be asynchronous amongst different areas. It is clear that dating moraines with cosmogenic 36 Cl surface exposure dating in carbonate lithologies in areas of high precipitation like the Dinaric karst, remains challenging.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)54-75
Sayfa sayısı22
DergiQuaternary Science Reviews
Hacim208
DOI'lar
Yayın durumuYayınlandı - 15 Mar 2019

Bibliyografik not

Publisher Copyright:
© 2019 Elsevier Ltd

Finansman

This work was supported by the Slovenian Research Agency (research core funding No. P1-0011 and P1-0025 ), The Scientific and Technological Research Council of Turkey (TÜBİTAK- 118Y052 ) and the Istanbul Technical University Research Fund (project MGA- 2017-40540 ). We are thankful to Klaus Wilcken at the ANSTO Lab in Australia for AMS measurements. We also acknowledge field assistance of Aleš Grlj (Institute of Anthropological and Spatial Studies, Slovenia) and laboratory assistance of Oğuzhan Köse (Istanbul Technical University). Nevesinje climate data are provided courtesy of the Federal Hydrometeorological Institute, Sarajevo, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina. We also appreciate insightful comments and suggestions by Philip Hughes, Adriano Ribolini and one anonymous referee, which resulted in a much-improved manuscript.

FinansörlerFinansör numarası
Istanbul Technical University Research FundMGA- 2017-40540
TÜBİTAK
Javna Agencija za Raziskovalno Dejavnost RSP1-0011, P1-0025
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu118Y052

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