Naslov
Sedimentary architecture and dating of Pleistocene breach deposits from Vranić locality, southern margin of the Pannonian Basin (Croatia)

Autori
Banak, Adriano ; Petrinjak, Krešimir ; Ruszkiczay- Rüdiger, Zsofia ; Avanić, Radovan ; Grizelj, Anita ; Budić, Marko

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

Izvornik
IAS 35th Meeting of Sedimentology, Book of Abstracts / Bábek, Ondrej ; Vodrážková, Stanislava - Prag : Palacký University Olomouc, 2021, 96-96

Skup
IAS 35th Meeting of SedimentologyIAS 35th International Meeting of Sedimentology (SEPM)

Mjesto i datum
Prag, Češka Republika, 23.05.2021. - 26.05.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Pleistocene, quartz sand, Pannonian Basin, burrial age, breach deposits

Sažetak
The Neogene formations at the marginal parts of the Pannonian Basin in Croatia include numerous quartz sand deposits. Vranić sand pit has been considered to be one of them. It is located at the southern foothills of the Papuk mountain in the eastern part of the country. The deposition of quartz sand during the Miocene and Pliocene in this area was cyclic. Cyclicity was induced by the regional tectonic events and repeated transgressions and regressions accompanied by intense weathering of exposed rocks (Pavelić, 2001). This weathering occured under moderately warm and humid climatic conditions. Vranić locality is abandoned sand pit 300 m long and more than 30 m thick. Sedimentology of Vranić has been previously described as a sand deposit in which sand was transported from adjacent Papuk mountain. In this research we have collected samples for sedimentological, SEM analysis and cosmogenic nuclides dating. Grain size analysis proved that coarse sand is dominant fraction (in range from 38 % to 97 % depending of the sample). SEM images of quartz grains display dominance of angular and sub-angular grains. Only a few of them are sub rounded. This confirms a theory of short transport from a nearby mountain. This research, which included dating of the sediment yielded much younger age then previous research suggested. Considering the field estimate sample depth of 10 m and a sediment density of 2 g/cm3 the burial duration is 1 608±403 ka. This places Vranić sand pit sediment in Lower Pleistocene, rather than Pliocene or Upper Miocene. The coupled pre-burial denudation rate is 591±148 m/Ma, which in agreement with the sedimentological properties observed at the outcrop suggests fast erosion of the source area and quick deposition of the sediment. Results from our research sugest at least two cycles of reworking of sandy material before final deposition during the Lower Pleistocene. Structureless facies of lower and middle part of the Vranić sand pit point out to breaching as a dominant and most probable depositional process.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA