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- Title
Paleo-glaciers and equilibrium-line altitude across Southeastern Europe - new data from the Southern Carpathians and from the Central Balkan Peninsula.
- Authors
Madarász, Balázs; Ruszkiczay-Rüdiger, Zsófia; Kern, Zoltán; Temovski, Marjan; Urdea, Petru; Braucher, Régis; Team, Aster
- Abstract
Past glaciations in mountain areas above 2000 m a.s.l. in SE Europe have produced typicallandscape features such as glacial cirques, U-shaped valleys, moraines and erratic boulders.However, scarce data are available regarding their extent and the chronology ofdeglaciations. Previous studies on glacial geomorphology and preliminary glacier reconstructionsuggest the occurrence of an icefield with 4.6-7 km long glacier tongues during themaximum ice extent at the Jablanica Mt (∼41.25˚ N; Central Balkan Peninsula,Macedonia; [1]). In the Retezat Mts (∼45.35˚ N; Southern Carpathians, Romania; [2-4])ice-covered plateaus existed to the south of the main drainage divide. This led toan asymmetric glacier system: on the north glaciers were steep and up to ∼8 kmlong, while the length of the gently sloping southern glacier system reached ∼ 20km. In this study, paleo-glaciers have been reconstructed accounting for possible pastexistence of glacier confluences and ice plateaus, as a basis for the estimation ofpaleo-equilibrium-line altitudes (ELA). The ELA depends on the temperature and availablemoisture. As the distribution of precipitation is more variable than the temperature, the studyof the regional trends and local differences of the paleo-ELAs may reveal past directions ofmoisture transport. The most extended glacial phase in the Retezat Mt was dated using cosmogenic in situ10Be exposure ages to the LGM (MIS 2). The ELA of the southern valley system was then∼100 m lower than that of the northern valleys, suggesting southerly moisturetransport. The dating of the Jablanica Mt paleo-glacier extents is still in progress. The ELA of itsmost extensive glacial phase was similar to the MIS 6 ELA of the inland rangesof the Balkan Peninsula [5] and to the LGM ELA of the Retezat Mt, tentativelyplacing the maximum ice extent of the Jablanica Mt to the MIS 2 or to the MIS6. Our preliminary results are in agreement with previous studies suggesting an enhancedmeridional moisture transport in the Mediterranean [6-9], and indicate that this had aconsiderable effect as far inland as the Southern Carpathians. This research was supported by the NKFIH FK124807 and K119309, by theGINOP-2.3.2-15 projects and by the INSU/CNRS and the ANR through the program"EQUIPEX Investissement d’Avenir" and IRD. References: [1] Temovski, et al., 2018. Geosciences 8, 270, 0-21; doi:10.3390/geosciences8070270 [2] Ruszkiczay-Rüdiger, et al., 2016. Quaternary International 415, 216-229. [3] Ruszkiczay-Rüdiger, et al., 2017. GRA 19, EGU2017-2755 [4] Ruszkiczay-Rüdiger, et al., 2018. Geologica Balcanica; XXI. CBGA Abstracts;240-241. [5] Hughes et al., 2010. QSR 29, 3690-3708. [6] Florineth and Schlüchter, 2000. Quat. Res. 54, 295 [7] Kuhlemann et al., 2008. Science, 321, 1338–1340, 10.1126/science.1157638 [8] Kuhlemann et al., 2013. Quat. Int. 293, 51–62. [9] Becker et al., 2016. Geogr. Helv. 71. 173-187
- Subjects
BALKAN Peninsula; TRANSYLVANIAN Alps (Romania); GLACIAL landforms; ALTITUDES; GEOLOGY; PENINSULAS; GLACIERS; GEOMORPHOLOGY
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article