Upper Campanian bentonite layers in the Scaglia-type limestone of the northern Dinarides (SE Slovenia)
ID Gerčar, David (Author), ID Zupančič, Nina (Author), ID Waśkowska, Anna (Author), ID Pavšič, Jernej (Author), ID Rožič, Boštjan (Author)

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The research area is located in south-eastern Slovenia and belongs to the eastern extensions of the Slovenian Basin adjacent to the Adriatic Carbonate Platform. The studied section is 25 m thick and consists of grey, brownish and reddish pelagic limestones and calciturbidites, and two bentonite layers 110 and 10 cm thick. Both volcanoclastic horizons consist of greenish, fine-grained muddy material. To date, no other bentonites of similar age are known in the wider Southern Alpine and Dinaridic region. The late Campanian to Campanian/Maastrichtian age of the succession was determined from planktonic foraminifera and calcareous nanoplankton assemblages. XRD analysis revealed the presence of calcite, quartz, muscovite/illite and smectite, which prevails in the clay fraction and is indicative of bentonite clays. We interpret these bentonite horizons as resulting from direct deposition of volcanic ash in a marine environment with a concomitant admixture of detrital material (quartz, muscovite) and later diagenetic carbonatization. The geochemical composition suggests a felsic volcanic origin. The most likely source is the Late Cretaceouse–Paleogene bimodal rhyolitic/basaltic volcanism documented along the Sava Suture Zone in present-day Croatia, Bosnia and Herzegovina, Serbia, and North Macedonia. In the Central Apennines three locations with bentonites have been documented. Further spatial and temporal analysis of similar volcanogenic horizons could yield important data on the paleogeographic and tectonic evolution of the Adria/Apulia continental margin.

Keywords:Campanian, bentonite, biostratigraphy, arc volcanism, Adria margin, Slovenian Basin
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:NTF - Faculty of Natural Sciences and Engineering
Publication status:Published
Publication version:Version of Record
Number of pages:20 str.
Numbering:Vol. 134, art. 105158
PID:20.500.12556/RUL-138223 This link opens in a new window
ISSN on article:0195-6671
DOI:10.1016/j.cretres.2022.105158 This link opens in a new window
COBISS.SI-ID:97302531 This link opens in a new window
Publication date in RUL:13.07.2022
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Record is a part of a journal

Title:Cretaceous research
Shortened title:Cretac. res.
COBISS.SI-ID:2417709 This link opens in a new window


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.


Funder:ARRS - Slovenian Research Agency
Funding programme:Young researchers

Funder:ARRS - Slovenian Research Agency
Project number:P1-0195
Name:Geookolje in geomateriali

Funder:ARRS - Slovenian Research Agency
Project number:P1-0008
Name:Paleontologija in sedimentarna geologija

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