| Title: | Geodynamic evolution of the Northernmost Dinarides revealed by the petrogenesis of Mid-Triassic calc-alkaline volcanic rocks |
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| Authors: | ID Slovenec, Damir (Author)
ID Kukoč, Duje (Author)
ID Smirčić, Duje (Author)
ID Šegvić, Branimir (Author)
ID Vukovski, Matija (Author)
ID Belak, Mirko (Author)
ID Kolar-Jurkovšek, Tea (Author)
ID Grgasović, Tonći (Author)
ID Goričan, Špela (Author)
ID Horvat, Marija (Author) |
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| Files: |  PDF - Presentation file, download (8,61 MB)
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  GeoZS - Geological Survey of Slovenia
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| Abstract: | This paper presents mineralogical, petrological, geochemical, and Sr–Nd isotopic data on volcanic rocks from the Northwestern Croatian Triassic Rift Basin, which is a locally aborted back-arc rift system of the Paleotethys. The dataset also includes their isotopic ages, along with the biostratigraphic ages of all interbedded sedimentary rocks. These volcano-sedimentary successions represent the northernmost parts of the Dinarides. The obtained 40Ar/39Ar isotopic age (243±1.8 Ma) indicates the Late Anisian age of the basaltic eruption and is somewhat consistent with the obtained Early Ladinian biostratigraphic ages of the interbedded sedimentary rocks. The initial εNd varies between −0.08 to +1.90, while the initial 87Sr/86Sr varies in a wide range from 0.704765 to 0.709248. The investigated Late Anisian to Early Ladinian calc-alkaline/shoshonitic basaltic lavas were formed through: (i) low-degree partial melting (5–14 %) of a shallow (spinel stability facies; max. depth ~33 km) magma source region in the subcontinental lithospheric mantle and (ii) fractional crystallisation in a partially open magmatic system. The magma generation also involved: (i) melts from the subducted slab, which is likely linked to the ancient, subducted oceanic crust of the Paleotethys, (ii) less abundant, previously subducted continental crustal material – sediments recycled in the mantle wedge, and (iii) a negligible contribution from depleted or an ocean-island, basalt-like mantle. These conditions suggest that the magma formed through a complex process during magma ascent through tectonically weakened crustal zones. Although the intense effusive volcanic activity during the Middle Triassic in the Northwestern Croatian Triassic Rift Basin lasted for a relatively short period (~3–4 Myr; Bithynian–Fassanian), its geodynamic evolution was complex and can be attributed to: (i) the subduction of the Paleotethyan lithosphere associated with an ensialic volcanic arc developed in an active continental margin setting, and (ii) the processes of continental rifting along the mid-Triassic margins of the Adria Plate, i.e., Greater Adria. These processes represent the beginning of rifting, which affected a greater area on the Balkan Peninsula as well. |
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| Keywords: | Middle Triassic, calc-alkaline volcanism, basalt suite, northernmost segment of the Dinarides, NW Croatia and E Slovenia |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 30.06.2026 |
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| Year of publishing: | 2026 |
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| Number of pages: | str. 307-329 |
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| Numbering: | vol. 77, no. 4 |
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| PID: | 20.500.12556/DiRROS-31346  |
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| UDC: | 551.1/.4 |
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| ISSN on article: | 1335-0552 |
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| DOI: | 10.31577/GeolCarp.2026.16 |
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| COBISS.SI-ID: | 283202051 |
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| Note: |
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| Publication date in DiRROS: | 29.07.2026 |
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| Views: | 47 |
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| Downloads: | 57 |
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