Naslov
Karstified clasts in south Velebit Mt. moraines, Croatia - evidence of glaciation of karstified mountain range

Autori
Marjanac, Tihomir ; Tomša, Ana Merija ; Marjanac, Ljerka ; Hughes, Phil ; van Calsteren, Peter

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

Izvornik
19th International Karstological school "Classical Karst". Karst Underground Protection. Postojna 20.-25.6.2011., Abstracts / Gostiničar, Petra ; Hauselmann, Philipp ; Prelovšek, Mitja ; Zupan Hajna, Nadja - Postojna : Karst Research Institute - ZRC SAZU, 2011, 52-52

Skup
19th International Karstological school "Classical Karst". Karst Underground Protection

Mjesto i datum
Postojna, Slovenija, 20.06.2011. - 25.06.2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
karst; karren; moraines; Pleistocene glaciation; Velebit Mt.; Dinarides

Sažetak
Middle Pleistocene moraines of Southern Velebit Mt. comprise karstified clasts which range from 0, 5 m up to more than 10 m in diameter. These are represented by lithologies which are common on the Velebit Mt. ; Upper Cretaceous limestones and Jelar-breccia of Paleogene-Neogene age. The moraines are several meters to several tens of meters thick and are composed of debris in grain contact, with interspaces locally filled with fine-grained matrix, and locally cemented by sparry calcite. The calcite cement is secondary infill of openwork moraine and was dated by U-Th series providing minimal age of 159.8 ka. The karstified clasts in these moraines are usually rotated and karren are abraded. Sometimes there are younger karren developed over the older forms, but both systems are today in a rotated position. Karstification of these clasts pre-dates formation of moraines which are attributed to the Riess glacial. These rillenkarren and rinnenkarren were possibly formed during the Mindel-Riess interglacial on nearby mountain tops, and were eroded and transported by glacial ice. Thus, recognition of karstified debris in moraines provides evidence of pre-middle Pleistocene karstification of the Dinaric Mountain range.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA