International Journal of Earth Sciences

, Volume 101, Issue 6, pp 1487–1501 | Cite as

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

  • Péter Ozsvárt
  • Lajos Dosztály
  • Georgios Migiros
  • Vassilis Tselepidis
  • Sándor Kovács
Original Paper


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.


Triassic Hellenides Greece Radiolarians Basalts Radiolarites 



The authors thank A. H. F. Robertson for discussion in the field concerning the Avdella Mélange. J. Pálfy corrected on an earlier draft of the manuscript. Two anonymous reviewers and editorial comments by A. H. F. Robertson helped improve the clarity and presentation. Péter Ozsvárt acknowledges a grant of the Hungarian Scientific Foundation (OTKA F048341) in support of his studies on Triassic and Jurassic radiolarians. This work was also supported by OTKA (K61872 and K81298).


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Péter Ozsvárt
    • 1
  • Lajos Dosztály
    • 4
  • Georgios Migiros
    • 2
  • Vassilis Tselepidis
    • 3
  • Sándor Kovács
    • 5
  1. 1.Hungarian Academy of Sciences–Hungarian Natural History MuseumResearch Group for PaleontologyBudapestHungary
  2. 2.Laboratory of Mineralogy-GeologyAgricultural UniversityAthensGreece
  3. 3.Institute of Geology and Mineral ExplorationAthensGreece
  4. 4.Hungarian Geological InstituteBudapestHungary
  5. 5.Geological, Geophysical and Space Science Research GroupHungarian Academy of Sciences–Eötvös Loránd UniversityBudapestHungary

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