Naslov
Mineralogical and geochemical characteristics of Early Sarmatian bentonite and marls from the Hrvatsko Zagorje Basin, Croatia

Autori
Grizelj, Anita ; Badurina, Luka ; Šegvić, Branimir ; Čaić-Janković, Ana

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

Izvornik
Book of Abstracts / Gorniak, Katarzyna ; Szydlak, Tadeusz ; Sek, Mateusz - Krakov : Wydawnictwo Naukowe Akapit, 2022, 40-40

ISBN
978-83-65955-60-9

Skup
10th Jubilee Mid-European Clay Conference

Mjesto i datum
Kliczkow Castle, Poland, 11.09.2022. - 15.09.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Recenziran

Ključne riječi
Sarmatian volcanism, bentonite, marls, clay minerals, provenance, Pannonian Basin System

Sažetak
A bentonite layer deposited between horizontally laminated marls was documented in the Sutla-II column recovered from northwestern part of the Hrvatsko Zagorje Basin (i.e. southwestern marginal belt of the Pannonian Basin System). Mineralogical analyses were performed by XRD and thermal analyses, while geochemical methods on the bulk sample included ICP-OES and ICP-MS. Additional chemical analyses were carried out on the coeval bentonite from northeastern Bosnia and Herzegovina (Ugljevik) to establish a potential regional correlation. Calcite and clay minerals (smectite, illite, kaolinite and in some samples chlorite) are the most abundant minerals in marls. The bentonite is dominated by montmorillonite (60- 70%). Besides them, it contains opal-CT, calcite, and small content of quartz. CEC of marls varied between 16.5 and 24.5 meq/100 g and in bentonite it revolved around 83 meq/100g. Provenance analysis indicates that bentonite was formed by intensive weathering of felsic to intermediate type volcanic ash. Smectite in marls, apart from its terrigenous origin, was likely sourced from the alteration of volcanic ash as well. The described occurrences of bentonite are associated with a distant volcanic eruption. Coeval deposition times and similar trace element abundances of bentonite analyzed herein and that from Ugljevik (Badurina et al., 2021) suggest that both likely originated from the Apuseni Mts or Eastern Carpathians via Early Sarmatian volcanism.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA