Abstract
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 δ13C curve is consistent with former studies. It displays a general increase from the Griesbachian to a prominent maximum beyond the +8‰ 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 siliciclastic member (red-coloured shale, siltstone, sandstone with oolitic/bioclastic 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.
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Acknowledgments
The field data were obtained during 2012. The investigation was part of the Austrian-Croatian Bilateral Project (No. 2014-15) supported by OeAD; the Austrian Agency for International Mobility and Cooperation in Education; and the Croatian Ministry of Science, Education and Sport. This research was partly supported by the Slovenian Research Agency (No. P1-0011). The facilities of the Geological Survey of Slovenia are acknowledged. This article is a contribution to IGCP 572 and IGCP 630. We would like to thank F Read and Y D Sun for their constructive comments which significantly helped to improve this contribution. We are especially grateful to Miss Lauren Chen for her help in language editing. The final publication is available at Springer via https://doi.org/10.1007/s12583-018-0787-3..
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Aljinović, D., Horacek, M., Krystyn, L. et al. Western Tethyan Epeiric Ramp Setting in the Early Triassic: An Example from the Central Dinarides (Croatia). J. Earth Sci. 29, 806–823 (2018). https://doi.org/10.1007/s12583-018-0787-3
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DOI: https://doi.org/10.1007/s12583-018-0787-3