Triassic evolution of the Adriatic-Dinaridic platform’s continental margins—insights from rare dolerite subvolcanic intrusions in External Dinarides, Croatia
This contribution reports new findings on petrogenesis and possible geotectonic setting of rare subvolcanic Triassic(?) dolerite cropping out in External Dinarides with a goal to contribute to the debate on the geodynamic evolution of the continental margin of the Adriatic-Dinaridic platform(s) at t...
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Académie des sciences
2023-01-01
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| Series: | Comptes Rendus. Géoscience |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.183/ |
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| author | Slovenec, Damir Belak, Mirko Badurina, Luka Horvat, Marija Šegvić, Branimir |
| author_facet | Slovenec, Damir Belak, Mirko Badurina, Luka Horvat, Marija Šegvić, Branimir |
| author_sort | Slovenec, Damir |
| collection | DOAJ |
| description | This contribution reports new findings on petrogenesis and possible geotectonic setting of rare subvolcanic Triassic(?) dolerite cropping out in External Dinarides with a goal to contribute to the debate on the geodynamic evolution of the continental margin of the Adriatic-Dinaridic platform(s) at the onset of the Mesozoic. Petrography of the studied rocks revealed the crystallization order: clinopyroxene ${\rightarrow }$ plagioclase ${\rightarrow }$ alkali-feldspar ${\pm }$ amphibole ${\pm }$ Fe–Ti oxides. The geochemistry of calc-alkaline dolerite suggested magma generation from a spinel–garnet bearing peridotite mantle source (60sp:40grt). Two mechanisms explaining the origin of dolerite are here suggested. The first one involves a low-grade partial melting of the altered lithospheric mantle and the subduction-modified oceanic lithosphere accompanied with subducted/recycled sediments. The second one proposes a melting of the subduction-altered heterogeneous lithospheric (subcontinental) mantle contaminated and/or metasomatized during an earlier Variscan subduction in the Late Paleozoic. Accordingly, two geodynamic interpretations are suggested: (i) Middle Triassic north-vergent active subduction of the Paleotethys beneath the Andean-type active Laurasian continental margin coupled by the formation of a pericontinental volcanic arc and subsequent extension and back-arc rifting, within the Adria Plate, which led to the formation of locally aborted rift systems and subsidence of the platform, and (ii) Middle Triassic extension, unaffected by contemporaneous active subduction, of the High Karst nappe unit of the Greater Adria as a result of an ephemeral syn-rift volcanic stage, which featured the formation of the Dinaridic aborted rift system followed by the platform subsidence and emergence of local sedimentary basins. |
| format | Article |
| id | doaj-art-943ddfae9f334942b07144956b3ecd9c |
| institution | Kabale University |
| issn | 1778-7025 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Académie des sciences |
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| series | Comptes Rendus. Géoscience |
| spelling | doaj-art-943ddfae9f334942b07144956b3ecd9c2025-02-07T10:39:55ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252023-01-01355G1356210.5802/crgeos.18310.5802/crgeos.183Triassic evolution of the Adriatic-Dinaridic platform’s continental margins—insights from rare dolerite subvolcanic intrusions in External Dinarides, CroatiaSlovenec, Damir0https://orcid.org/0000-0002-6485-7930Belak, Mirko1Badurina, Luka2https://orcid.org/0000-0001-7784-4162Horvat, Marija3https://orcid.org/0000-0002-2445-5283Šegvić, Branimir4https://orcid.org/0000-0002-3769-7249Croatian Geological Survey, Sachsova 2, 10000 Zagreb, CroatiaCroatian Geological Survey, Sachsova 2, 10000 Zagreb, CroatiaDepartment of Geosciences, Texas Tech University, 1200 Memorial Circle, Lubbock, TX 79409, USACroatian Geological Survey, Sachsova 2, 10000 Zagreb, CroatiaDepartment of Geosciences, Texas Tech University, 1200 Memorial Circle, Lubbock, TX 79409, USAThis contribution reports new findings on petrogenesis and possible geotectonic setting of rare subvolcanic Triassic(?) dolerite cropping out in External Dinarides with a goal to contribute to the debate on the geodynamic evolution of the continental margin of the Adriatic-Dinaridic platform(s) at the onset of the Mesozoic. Petrography of the studied rocks revealed the crystallization order: clinopyroxene ${\rightarrow }$ plagioclase ${\rightarrow }$ alkali-feldspar ${\pm }$ amphibole ${\pm }$ Fe–Ti oxides. The geochemistry of calc-alkaline dolerite suggested magma generation from a spinel–garnet bearing peridotite mantle source (60sp:40grt). Two mechanisms explaining the origin of dolerite are here suggested. The first one involves a low-grade partial melting of the altered lithospheric mantle and the subduction-modified oceanic lithosphere accompanied with subducted/recycled sediments. The second one proposes a melting of the subduction-altered heterogeneous lithospheric (subcontinental) mantle contaminated and/or metasomatized during an earlier Variscan subduction in the Late Paleozoic. Accordingly, two geodynamic interpretations are suggested: (i) Middle Triassic north-vergent active subduction of the Paleotethys beneath the Andean-type active Laurasian continental margin coupled by the formation of a pericontinental volcanic arc and subsequent extension and back-arc rifting, within the Adria Plate, which led to the formation of locally aborted rift systems and subsidence of the platform, and (ii) Middle Triassic extension, unaffected by contemporaneous active subduction, of the High Karst nappe unit of the Greater Adria as a result of an ephemeral syn-rift volcanic stage, which featured the formation of the Dinaridic aborted rift system followed by the platform subsidence and emergence of local sedimentary basins.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.183/Middle Triassic(?)Calc-alkaline subvolcanic rocksActive continental marginExternal DinaridesDolerite |
| spellingShingle | Slovenec, Damir Belak, Mirko Badurina, Luka Horvat, Marija Šegvić, Branimir Triassic evolution of the Adriatic-Dinaridic platform’s continental margins—insights from rare dolerite subvolcanic intrusions in External Dinarides, Croatia Comptes Rendus. Géoscience Middle Triassic(?) Calc-alkaline subvolcanic rocks Active continental margin External Dinarides Dolerite |
| title | Triassic evolution of the Adriatic-Dinaridic platform’s continental margins—insights from rare dolerite subvolcanic intrusions in External Dinarides, Croatia |
| title_full | Triassic evolution of the Adriatic-Dinaridic platform’s continental margins—insights from rare dolerite subvolcanic intrusions in External Dinarides, Croatia |
| title_fullStr | Triassic evolution of the Adriatic-Dinaridic platform’s continental margins—insights from rare dolerite subvolcanic intrusions in External Dinarides, Croatia |
| title_full_unstemmed | Triassic evolution of the Adriatic-Dinaridic platform’s continental margins—insights from rare dolerite subvolcanic intrusions in External Dinarides, Croatia |
| title_short | Triassic evolution of the Adriatic-Dinaridic platform’s continental margins—insights from rare dolerite subvolcanic intrusions in External Dinarides, Croatia |
| title_sort | triassic evolution of the adriatic dinaridic platform s continental margins insights from rare dolerite subvolcanic intrusions in external dinarides croatia |
| topic | Middle Triassic(?) Calc-alkaline subvolcanic rocks Active continental margin External Dinarides Dolerite |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.183/ |
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