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    Tracing metamorphism, exhumation and topographic evolution in orogenic belts by multiple thermochronology: a case study from the Nizke Tatry Mts., Western Carpathians

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    Authors
    Danisik, M.
    Kadlec, J.
    Glotzbach, C.
    Weisheit, A.
    Dunkl, I.
    Kohut, M.
    Evans, Noreen
    Orvosova, M.
    McDonald, Bradley
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Danisik, Martin and Kadlec, Jaroslav and Glotzbach, Christoph and Weisheit, Anett and Dunkl, Istvan and Kohut, Milan and Evans, Noreen J. and Orvosova, Monika and McDonald, Brad J. 2011. Tracing metamorphism, exhumation and topographic evolution in orogenic belts by multiple thermochronology: a case study from the Nizke Tatry Mts., Western Carpathians. Swiss Journal of Geosciences. 104: pp. 285-298.
    Source Title
    Swiss Journal of Geosciences
    DOI
    10.1007/s00015-011-0060-6
    ISSN
    1661-8726
    School
    John de Laeter Centre for Mass Spectrometry (COE)
    URI
    http://hdl.handle.net/20.500.11937/42737
    Collection
    • Curtin Research Publications
    Abstract

    A combination of four thermochronometers [zircon fission track (ZFT), zircon (U–Th)/He (ZHe), apatite fission track (AFT) and apatite (U–Th–[Sm])/He (AHe) dating methods] applied to a valley to ridge transect is used to resolve the issues of metamorphic, exhumation and topographic evolution of the Nizke Tatry Mts. in the Western Carpathians. The ZFT ages of 132.1 ± 8.3, 155.1 ± 12.9, 146.8 ± 8.6 and 144.9 ± 11.0 Ma show that Variscan crystalline basement of the Nizke Tatry Mts. was heated to temperatures >210 °C during the Mesozoic and experienced a low-grade Alpine metamorphic overprint. ZHe and AFT ages, clustering at ~55–40 and ~45–40 Ma, respectively, revealed a rapid Eocene cooling event, documenting erosional and/or tectonic exhumation related to the collapse of the Carpathian orogenic wedge. This is the first evidence that exhumation of crystalline cores in the Western Carpathians took place in the Eocene and not in the Cretaceous as traditionally believed. Bimodal AFT length distributions, Early Miocene AHe ages and thermal modelling results suggest that the samples were heated to temperatures of ~55–90 °C during Oligocene–Miocene times. This thermal event may be related either to the Oligocene/Miocene sedimentary burial, or Miocene magmatic activity and increased heat flow. This finding supports the concept of thermal instability of the Carpathian crystalline bodies during the post-Eocene period.

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