Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)

Rožič, Boštjan; Jurkovšek, Tea Kolar; Rožič, Petra Žvab; Gale, Luka

doi:10.1515/geoca-2017-0036

Cited by 9 publications

(6 citation statements)

References 41 publications

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“…The Krikov Formation from the study area is dominated by hemipelagic limestone, with the subordinate occurrence of resedimented limestones. Similar successions are found in the Mrzli vrh and Mirna sections (Rožič, 2006;Rožič et al, 2017Rožič et al, , 2022, whereas similar developments are found along the entire SB southern margin (Rožič, 2006;Rožič et al, 2019Rožič et al, , 2022.…”

Section: Discussionsupporting

confidence: 61%

Upper Triassic–to Lower Cretaceous Slovenian Basin successions in the northern margin of the Sava Folds

Scherman,

Rožič,

Görög

et al. 2023

Geologija

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The evolution of the Slovenian Basin southern margin is currently interpreted based on the successions outcropping in the surroundings of Škofja Loka, on the Ponikve Plateau and in the foothills of the Julian Alps in western Slovenia, as well as from the valley of the Mirna River in south-eastern Slovenia. However, no extensive research on this paleogeographic unit has been carried out in the northern part of the Sava Folds region. Recent field observations permitted the recognition of Upper Triassic to lowermost Cretaceous successions of the Slovenian Basin, including the recently described Middle Jurassic Ponikve Breccia Member of the Tolmin Formation. Based on reambulation-type geological mapping, macroscopic facies observations supported by microfacies analysis and biostratigraphy, three stratigraphic columns were constructed showcasing Slovenian Basin formations on the northern flank of the Trojane Anticline (Sava Folds region). These newly described successions encompass Upper Triassic (Bača Dolomite Formation) and Jurassic–lowermost Cretaceous resedimented limestones and pelagic formations, while the attribution of the Pseudozilian Formation is complex. Based on facies characteristics these successions are similar to those preserved in the Podmelec Nappe (lowermost thrust unit of the Tolmin Nappe) in western Slovenia. The connection between the western and the eastern Slovenian Basin during the Late Triassic-Early Cretaceous interval could be thus recognised.

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Section: Discussionsupporting

confidence: 61%

Upper Triassic–to Lower Cretaceous Slovenian Basin successions in the northern margin of the Sava Folds

Scherman,

Rožič,

Görög

et al. 2023

Geologija

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“…3). The succession is generally equal to the one described above in the Geological Setting chapter, but the Norian-Rhaetian is dominated by massive dolomite overlain by basal limestone breccia of the Krikov Formation (for details see Rožič, et al, 2017). Some coarser grained calciturbidites (limestone microbreccia) occur within the Krikov Formation.…”

Section: Mt Mrzli Vrh Sectionmentioning

confidence: 78%

A glimpse of the lost Upper Triassic to Middle Jurassic architecture of the Dinaric Carbonate Platform margin and slope

Rožič¹,

Gale²,

Oprčkal³

et al. 2022

Geologija

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In the southernmost outcrops of the Slovenian Basin the Middle Jurassic coarse-grained limestone breccia (mega)beds are interstratified within a succession that is otherwise dominated by hemipelagites and distal turbidites. In this paper, these beds are described as the Ponikve Breccia Member of the Tolmin Formation. We provide descriptions of the studied sections with detailed geological maps and analysis of the breccia lithoclasts. From the latter, a non-outcropping margin of the Dinaric Carbonate Platform is reconstructed. In the Late Triassic the platform margin was characterized by a Dachstein-type marginal reef. After the end-Triassic extinction event, the platform architecture remained, but the reefs were replaced by sand shoals characterized by ooids. In the late Early Jurassic and/or early Middle Jurassic a slope area might have been dissected by normal faults and a step-like paleotopography was formed. In the Bajocian, during a period of major regional geodynamic perturbations, extensional or transtensional tectonic activity intensified and triggered the large-scale collapses of the Dinaric Carbonate Platform margin producing the limestone breccias described herein. This may in turn have caused a backstepping of the platform margin, as is evident from the occurrence of Late Jurassic marginal reefs that are installed directly above the Upper Triassic and Lower Jurassic inner platform successions.

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“…This deep basin came into existence between the Adriatic-Dinaridic Carbonate platform (ADCP) and the Julian Carbonate Platform (JCP) in the early Carnian and continued until the Early Cretaceous (Buser 1989;Vrabec et al 2009). The drowning of the JCP took place in the late Pliensbachian and then it was transformed into a submarine high (Rožič et al 2017(Rožič et al , 2018. Since the euphotic conditions did not change significantly on the ADCP, from that time this platform may have been the only source of the redeposited shallow-marine carbonate grains.…”

Section: Comparison With Age-equivalent Successionsmentioning

confidence: 99%

Upper Triassic‒Middle Jurassic resedimented toe-of-slope and hemipelagic basin deposits in the Dinaridic Ophiolite Belt, Zlatar Mountain, SW Serbia

Haas

Jovanović²,

Görög

et al. 2019

Facies

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In the Dinaridic Ophiolite Belt, small (m-scale) to large (km-scale) blocks of Middle to Upper Triassic, and Middle to Upper Jurassic, more or less silicified bedded limestone are widely present, both as parts of para-autochthonous successions and as redeposited blocks in ophiolitic mélanges. The studied, approximately 230-m-thick succession in the wider area of Zlatar Mountain, is one of the most important para-autochthonous sections in the Serbian part of the Dinaridic Ophiolite Belt. The succession is made up of an alternation of redeposited carbonate toe-of-slope deposits, sand to clay-sized siliciclastic rocks, hemipelagic mudstones and radiolarite-spongiolite basin facies. In the lower part of the sequence, the components of the siliciclastic beds were derived mostly from low-and medium-grade metamorphic rocks. Similar components, together with sand-sized fragments of ophiolitic rocks, were encountered in small amounts in some redeposited carbonate beds. The chronostratigraphic assignment of the succession is based mostly on foraminifers, but age-diagnostic radiolarians and other microfossil groups were also considered. In the lower part of the probably continuous succession, a Norian-Rhaetian assemblage was recognized; a Sinemurian-Pliensbachian assemblage was encountered up-section, whereas the upper part of the succession could be assigned to the Bajocian-Bathonian. Considering the paleogeographic reconstructions and the analogies of age-equivalent sections, the succession records the depositional history of the Bosnian Basin during the Late Triassic to Middle Jurassic period and may contribute to the understanding of the evolution of the Adriatic margin of the Neotethys Ocean in the transition interval from passive to active margin stages.

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Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)

Cited by 9 publications

References 41 publications

Upper Triassic–to Lower Cretaceous Slovenian Basin successions in the northern margin of the Sava Folds

Upper Triassic–to Lower Cretaceous Slovenian Basin successions in the northern margin of the Sava Folds

A glimpse of the lost Upper Triassic to Middle Jurassic architecture of the Dinaric Carbonate Platform margin and slope

Upper Triassic‒Middle Jurassic resedimented toe-of-slope and hemipelagic basin deposits in the Dinaridic Ophiolite Belt, Zlatar Mountain, SW Serbia

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