DOI: 10.1016/j.quascirev.2019.02.002
Scopus记录号: 2-s2.0-85061426859
论文题名: First 36 Cl cosmogenic moraine geochronology of the Dinaric mountain karst: Velež and Crvanj Mountains of Bosnia and Herzegovina
作者: Žebre M. ; Sarıkaya M.A. ; Stepišnik U. ; Yıldırım C. ; Çiner A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 208 起始页码: 54
结束页码: 75
语种: 英语
英文关键词: Cosmogenic surface exposure dating
; Dinaric karst
; Equilibrium line altitude
; Glaciation
; Palaeoclimate
; Quaternary
Scopus关键词: Geochronology
; Glacial geology
; Dinaric karst
; Equilibrium line altitudes
; Glaciation
; Palaeoclimate
; Quaternary
; Surface exposure dating
; Landforms
; age determination
; altitude
; chlorine isotope
; cosmogenic radionuclide
; dating method
; equilibrium line
; geochronology
; glaciation
; karst
; late glacial
; moraine
; mountain region
; paleoclimate
; paleoenvironment
; Quaternary
; radiocarbon dating
; Alps
; Balkans
; Bosnia and Herzegovina
; Crvanj Mountain
; Dinaric Alps
; Eastern Alps
; Mediterranean Region
英文摘要: 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. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117367
Appears in Collections: 气候变化与战略
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Recommended Citation:
Žebre M.,Sarıkaya M.A.,Stepišnik U.,et al. First 36 Cl cosmogenic moraine geochronology of the Dinaric mountain karst: Velež and Crvanj Mountains of Bosnia and Herzegovina[J]. Quaternary Science Reviews,2019-01-01,208