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    Upper Cretaceous Gosau deposits of the Apuseni Mountains (Romania) - similarities and differences to the Eastern Alps

    137487_18595_Schuller_etal_AJES_2009.pdf (2.567Mb)
    Access Status
    Open access
    Authors
    Schuller, V.
    Frisch, W.
    Danisik, Martin
    Dunkl, I.
    Melinte, M.
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Schuller, Volker and Frisch, Wolfgang and Danisik, Martin and Dunkl, Istvan and Melinte, Mihaela. 2009. Upper Cretaceous Gosau deposits of the Apuseni Mountains (Romania) - similarities and differences to the Eastern Alps. Austrian Journal of Earth Sciences. 102: pp. 133-145.
    Source Title
    Austrian Journal of Earth Sciences
    ISSN
    2072-7151
    Faculty
    John De Laeter Centre For Mass Spectrometry (JdL
    Faculty of Science and Engineering
    School
    John de Laeter Centre for Mass Spectrometry (COE)
    URI
    http://hdl.handle.net/20.500.11937/11517
    Collection
    • Curtin Research Publications
    Abstract

    The Apuseni Mountains were formed during Late Cretaceous convergence between the Tisia and the Dacia microplates as part of the Alpine orogen. The mountain range comprises a sedimentary succession similar to the Gosau Group of the Eastern Alps. This work focuses on the sedimentological and geodynamic evolution of the Gosau basin of the Apuseni Mts. and attempts a direct comparison to the relatively well studied Gosau Group deposits of the Eastern Alps. By analyzing the Upper Cretaceous Gosau sediments and the surrounding geological units, we were able to add critical evidence for reconstructing the Late Mesozoic to Paleogene geodynamic evolution of the Apuseni Mountains. Nannoplankton investigations show that Gosau sedimentation started diachronously after Late Turonian times. The burial history indicates low subsidence rates during deposition of the terrestrial and shallow marine Lower Gosau Subgroup and increased subsidence rates during the period of deep marine Upper Gosau Subgroup sedimentation.The Gosau Group of the Apuseni Mountains was deposited in a forearc basin supplied with sedimentary material from an obducted forearc region and the crystalline hinterland, as reflected by heavy mineral and paleocurrent analysis. Zircon fission track age populations show no fluctuation of exhumation rates in the surrounding geological units, which served as source areas for the detrital material, whereas increased exhumation at the K/Pg boundary can be proven by thermal modeling on apatite fission track data. Synchronously to the Gosau sedimentation, deep marine turbidites were deposited in the deep-sea trench basin formed by the subduction of the Transylvanian Ocean. The similarities to the Gosau occurrences of the Eastern Alps lead to direct correlation with the Alpine paleogeographic evolution and to the assumption that a continuous ocean basin (South Penninic - Transylvanian Ocean Basin) was consumed until Late Cretaceous times.

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