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Sedimentology and biostratigraphy of the Biancone Limestone Formation of the Tolmin Basin (Southern Alps, NW Slovenia)
ID Rožič, Boštjan (Author), ID Reháková, Daniela (Author)

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Abstract
The Tolmin Basin constitutes the western part of the Slovenian Basin, a large Mesozoic interplatform basin that was bounded to the north by the Julian Carbonate Platform and to the south by the Dinaric Carbonate Platform. Today, it is found along the structural boundary between the Southern Alps and the External Dinarides in northwestern Slovenia. After the drowning of the Julian Carbonate Platform, the Tolmin Basin was dominated by pelagic deposits, namely the Toarcian marlstones (Perbla Formation), the Aalenian to lower Tithonian siliceous limestones and radiolarites (Tolmin Formation), and the upper Tithonian to the Berriasian Biancone Limestone Formation. In this study, a basin-scale sedimentary evolution and calpionellid biostratigraphy of the latter is presented. The Biancone Limestone Formation is a calpionellid-bearing pelagic limestone typical of all deepened segments of the Adria microplate in this time interval. It is generally monotonous but shows considerable vertical and lateral variations. The lower boundary with radiolarites is sharp, revealing a pronounced and rapid overturn in pelagic sedimentation. The lower Berriasian slumps indicate a tectonic pulse. Rare beds of resedimented limestones, assigned to the middle Berriasian, are similar in composition to those intercalated in the underlying radiolarites. They thus show that the factors that led to a significant shift in pelagic sedimentation had little or no effect on shallow-marine carbonate production. In the upper Berriasian, an increase in clay content is evident in the formation, which is explained by the uplift and erosion of the propagating thrust belt in the Neotethys area, superimposed by humidification.

Language:English
Keywords:Biancone Limestone, Slovenian-Tolmin Basin, Southern Alps, Jurassic/Cretaceous boundary, calpionellid biostratigraphy
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
Year:2024
Number of pages:15 str.
Numbering:Vol. 163, art. 105958
PID:20.500.12556/RUL-159776 This link opens in a new window
UDC:55
ISSN on article:0195-6671
DOI:10.1016/j.cretres.2024.105958 This link opens in a new window
COBISS.SI-ID:202268675 This link opens in a new window
Publication date in RUL:24.07.2024
Views:145
Downloads:45
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Record is a part of a journal

Title:Cretaceous research
Shortened title:Cretac. res.
Publisher:Elsevier
ISSN:0195-6671
COBISS.SI-ID:2417709 This link opens in a new window

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Projects

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

Funder:Other - Other funder or multiple funders
Funding programme:Slovak Grant Agency
Project number:APVV-20-0079

Funder:Other - Other funder or multiple funders
Funding programme:VEGA Agency
Project number:2/0012/24

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