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Gewählte Publikation:

Mihevc, A; Bavec, M; Hauselmann, P; Fiebig, M.
(2015): DATING OF THE UDIN BORST CONGLOMERATE TERRACE AND IMPLICATION FOR TECTONIC UPLIFT IN THE NORTWESTHERN PART OF THE LJUBLJANA BASIN (SLOVENIA)
ACTA CARSOLOGICA. 2015; 44(2): 169-176.

Abstract:
The northwestern part of the Ljubljana Basin is filled mostly with fluvioglacial sediments deposited by rivers coming from Alpine mountain groups. The Trziska Bistrica River, flowing from the Karavanke Mountains, has deposited a large alluvial fan consisting predominantly of carbonate pebbles with subordinate amounts of siliciclastic pebbles. The oldest infill, cemented into a conglomerate terrace named Udin Borst, overlies an erosional surface on Oligocene mudstone. The thickness of the conglomerate terrace is up to 50 m. The conglomerate terrace is well karstified; the surface is dissected by numerous dolines and covered with a thick soil sequence. There are several caves. The most important are spring caves formed on the contact with the underlying impermeable basement. Samples of quartz pebbles were taken from the walls and ceiling in the 815 m long spring Arneseva Luknja Cave for cosmogenic nuclides burial age dating. The calculated burial age yielded an age of 1.86 +/- 0.19 Ma that gives (i) the age of the oldest known infill in the Ljubljana Basin and (ii) indicates the time of change of the sedimentary system in the Basin from erosion to deposition. The age of the Udin Borsk karst and caves is significantly younger. The age dates provide grounds for a first relatively firm estimate of the long-term tectonic uplift of the Udin Borst terrace to be between 0.06 and 0.04 mm/yr. This tectonic uplift rate may be related to the activity of the regional Sava Fault.
Autor*innen der BOKU Wien:
Fiebig Markus
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Find related publications in this database (Keywords)
conglomerate river terrace
burial age dating
Be-10-Al-26
tectonics
uplift rate
Pleistocene
cave
Southern Alps


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