Naslov
Pleistocene tufa deposits at Roški Slap in Krka National Park, Croatia – geochronology and evolution

Autori
Domínguez-Villar, David ; Krklec, Kristina ; Cukrov, Neven ; Cheng, Hai ; Edwards, Lawrence R.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
4th Scientific meeting «Quaternary geology in Croatia and Slovenia», Abstracts, Excursion guidebook / Marjanac, Ljerka - Zagreb : Hrvatska akademija znanosti i umjetnosti (HAZU), 2015, 7-7

ISBN
978-953-347-021-4

Skup
4th Scientific meeting «Quaternary geology in Croatia and Slovenia»

Mjesto i datum
Zagreb, Hrvatska, 25.03.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
tufa ; Krka ; geochronology ; Roški slap

Sažetak
Tufa barriers are good environmental indicators due to fast response to climate change and other environmental conditions at the time of their creation. At Roški slap within Krka National Park in addition to the currently active tufa barriers ancient tufa sediments are preserved in the canyon walls. Cascade facies of these sediments (up to 22.5 m above the current river level (m c.r.l.)) suggests the existence of a eroded barrier-lake tufa system (B-LS). Mamelar tufa sediments confirmed existence of tufa bearing lake and represents the formation of a 2nd B-LS slightly downstream, with a lake at least 7 m in depth and sediments reaching a minimum height of 8.5 m c.r.l. This 2nd B-LS was formed after the erosion of the previous B-LS since the mamelar tufa forms on top of a large gravitationally block left after the erosion episode. In order to establish the chronology of 1st B-LS and to determine rate of its erosion, we used U-Th dating method. Four analyses from the 1st B-LS provided dates from 123 to 130 ka BP with uncertainties ranging from 0.9 to 1.3 ka, while eight analyses from the 2nd B-LS provided dates from 122 to 130 ka BP with uncertainties ranging from 2.3 to 3.8 ka. Based on the initial 230Th, the ages might be slightly younger than here reported. Despite we assume that there is a limited uncertainty in the accuracy, we can conclude that both phases of B-LS were deposited during the Last Interglacial Period. The geochronological data does not allow discerning between the ages of both deposits. In any case, we can conclude that at this site, the erosion of barrier-lake systems was very fast in geological terms. Further research on the causes of tufa erosion might help the protection of natural wonders such as Krka National Park.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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