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New radiolarian biostratigraphic age constraints on Middle Triassic basalts and radiolarites from the Inner Hellenides (Northern Pindos and Othris Mountains, Northern Greece) and their implications for the geodynamic evolution of the early Mesozoic Neotethys |
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| Authors: | Péter Ozsvárt Lajos Dosztály Georgios Migiros Vassilis Tselepidis Sándor Kovács |
| Institution: | 1. Hungarian Academy of Sciences–Hungarian Natural History Museum, Research Group for Paleontology, P.O. Box 137, 1431, Budapest, Hungary 4. Hungarian Geological Institute, Stefánia u. 14, 1143, Budapest, Hungary 2. Laboratory of Mineralogy-Geology, Agricultural University, Iera Odos 75, 11855, Athens, Greece 3. Institute of Geology and Mineral Exploration, Messoghion 70, 11855, Athens, Greece 5. Geological, Geophysical and Space Science Research Group, Hungarian Academy of Sciences–E?tv?s Loránd University, Pázmány P. sétány 1/C, 1117, Budapest, Hungary |
| Abstract: | The Avdella Mélange in the northern Pindos Mountains and its equivalent formation, the Loggitsion Unit in the Othris Mountains expose early Mesozoic (Mid-Late Triassic) oceanic fragments beneath the Western Greek Ophiolite Belt of the Inner Hellenides, Northern Greece. The mélange consists of locally interfingering blocks and slices of ribbon radiolarite, radiolarian chert and pillow basalt and is usually overthrust by Jurassic ophiolites. New Middle and Upper Triassic radiolarian biostratigraphic data are presented from radiolarites and basalt-radiolarite sequences within mélange blocks. Pillow basalts associated with the radiolarites provide clues to the opening of the Neotethyan ocean basin. The radiolarians indicate a Middle Triassic age (latest Anisian, probably early Illyrian), which is documented for the first time in the northern Pindos Mountains. The new radiolarian biostratigraphic data suggest that rift-type basalt volcanism already began in pre-Ladinian time (late Scythian?—Anisian). These basalts were then overlain by Upper Anisian to Carnian (?Norian) radiolarites. |
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