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New Advances in Biostratigraphy of the Lower/Middle Norian Transition:Conodonts of the Dov?ko Section,Slovenia

Journal of Earth Science 2021年第3期32卷 677-699页

作者： Viktor Karadi Tea Kolar-jurkovsek Luka Gale bogdan jurkovsek Department of Palaeontology Eotvos Lorand UniversityBudapest 1117Hungary Geological Survey of Slovenia Ljubljana 1000Slovenia Department of Geology University of LjubljanaLjubljana 1000Slovenia Kamnica 27 1262 Doipri LjubljaniSlovenia

This study presents the results of the conodont biostratigraphy and microfacies analysis carried out on the pelagic limestones of the Upper Triassic Dov?ko Section in Slovenia,which represents the eastern part of the Slovenian *** age of the section ranges from the Lacian 1 to the Alaunian *** Lacian part of the succession is predominantly characterized by the representatives of the genus *** morphologies towards Alaunian faunas first appear in the Lacian 3 and become common during the Lacian-Alaunian *** evolutionary development coincides with a shift in microfacies from a dominantly radiolarian-bearing mudstone-wackestone-packstone to a filament-dominated wackestone-packstone,and the formation of small neptunian dykes,which may reflect environmental perturbations and/or a change in basin *** proliferation of the genera Epigondolella and Mockina is observed in the Alaunian part of the section,though the genus Ancyrogondolella is still present in this *** description of the conodont taxa is provided,and seven new species and two new subspecies are *** new advances will be of great value in further biostratigraphic studies,especially in areas without ammonoid faunas,and in the reconstruction of the paleogeography of the Slovenian Basin.

关键词： conodonts microfacies Late Triassic Norian Lacian Alaunian Slovenian Basin cherty limestone

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Stratigraphic Definition and Correlation of Middle Triassic Volcaniclastic Facies in the External Dinarides： Croatia and Bosnia and Herzegovina

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Journal of Earth Science 2018年第4期29卷 864-878页

作者： Duje Smircic Tea Kolar-jurkovsek Dunja Aljinovic Uros Barudzija bogdan jurkovsek Hazim Hrvatovic University of Zagreb Faculty of Mining Geology and Petroleum Engineering Pierottijeva 6 Zagreb 10000 Croatia Geological Survey of Slovenia Dimiceva Ulica 14 Ljubljana 1000 Slovenia Geological Survey of Federation of Bosnia and Herzegovina Ilidza Ustanicka 11 Sarajevo Bosnia and Herzegovina

Middle Triassic volcaniclastic depositsin the External Dinarides of Croatia and Bosnia and Herzegovina are related to the rifting of the Tethyan Ocean. Three localities in the External Dinarides： Donje Pazariste, Bosansko Grahovo and Zelovo were biostratigraphically analysed in this study. The Middle Triassic carbonate deposits with volcaniclastic interlayers in Donje Pazariste were defined by means of conodonts. Rare ammonoid specimens were *** conodont and ammonoid taxa suggest these sections are of Early Illyrian to Early Fassanian Age. The section studied in Bosansko Grahovo is dominantly composed of volcanic and volcaniclastic rocks. Limestone peperites were collected for conodont analysis. Two conodont zones were defined, suggesting volcanic activity in the same, from Lower Illyrian to Fassanian, time interval. The Zelovo Section was biostratigraphically investigated by several authors. The pietra verde deposits from Zelovo are referred as late Fassanian to Early Longobardian Age. Biostratigraphic correlation from mentioned three localities imply that the magmatic activity in the External Dinarides, and formation of different volcaniclastic facies lasted from Illyrian to Longobardian, similar as in the surrounding western Tethyan territories.

关键词： External Dinarides biostratigraphy Middle Triassic volcaniclastic deposits western Tethys.

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Western Tethyan Epeiric Ramp Setting in the Early Triassic： An Example from the Central Dinarides (Croatia)

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Journal of Earth Science 2018年第4期29卷 806-823页

作者： Dunja Aljinovic Micha Horacek Leopold Krystyn Sylvain Richoz Tea Kolar-jurkovsek Duje Smircic bogdan jurkovsek University of Zagreb Faculty of Mining Geology and Petroleum Engineering Pierottijeva 6 Zagreb 10000 Croatia BLT Wieselburg HBLFA Francisco-Josephinum Rottenhauserstr. 1 Wieselburg 3250 Austria Institute of Paleontology Vienna University A lthanstrafle 14 Vienna 1090 Austria Lund University Lithosphere and Biosphere science Solvegatan 12 Lund 22362 Sweden Geological Survey of Slovenia Dimiceva Ulica 14 Ljubljana 1000 Slovenia

In the central part of the External Dinarides in Plavno, Croatia, near Knin, a remarkably thick （927.5 m） Early Triassic depositional sequence was investigated. The Plavno sequence starts in the EarlyGriesbachian and ends with a continuous transition into the Anisian strata. A complete 13C isotope curve has been achieved and combined with conodonts, bivalves and ammonoids to establish and correlate stage and substage boundaries. The 613C curve is consistent with former studies. It displays a general increase from the Griesbachian to a prominent maximum beyond the ＋8%0 amplitude around the Dienerian-Smithian boundary （DSB）, followed by a steep and continuous decline to low, negative values in the Smithian. Around the Smithian-Spathian boundary （SSB） a steep rise to a second maximum occurred. It is followed by a saw-tooth shaped decline in the Spathian and a similar increase to a peak at the Spathian-Anisian boundary （SAB）. Sedimentologically, the Plavno sequence is interpreted as having been deposited on an extensive epeiric ramp under long-term transgressive conditions, sharing depositional characteristics of both the epeiric platform and the carbonate ramp. The entire Plavno sequence was deposited above the storm-wave base and was storm influenced. Three informal members are differentiated： 1） the dolostone member （Early Griesbachian）; 2） the silicielastic member （red-coloured shale, siltstone, sandstone with oolitic/bioclastie grainstone intercalations）, which can be further divided into lower, middle and upper intervals （Late Griesbachian, Dienerian and Smithian）; and 3） the mudstone member （grey lime mudstones, marls and calcisiltites with common ammonoids and gastropods- Spathian）. The Plavno sequence is compared with other western Tethyan sections. Observed differences stem from local controls on deposition in the overall shallow marine environment.

关键词： Early Triassic Dinarides epeiric ramp 6Z3C isotope curve litho- and biostratigraphy.

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