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    U‐PB detrital zircon geochronology of the Lower Danube and Its tributaries : implications for the geology of the Carpathians

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    Date
    2018-09-14
    Author
    Ducea, Mihai N.  Concept link
    Giosan, Liviu  Concept link
    Carter, Andrew  Concept link
    Balica, Constantin  Concept link
    Stoica, Adriana M.  Concept link
    Roban, Relu D.  Concept link
    Balintoni, Ion  Concept link
    Filip, Florin  Concept link
    Petrescu, Lucian  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10711
    As published
    https://doi.org/10.1029/2018GC007659
    DOI
    10.1029/2018GC007659
    Keyword
     Danube; Carpathians; Detrital zircon; U‐Pb geochronology; Continental crust 
    Abstract
    We performed a detrital zircon (DZ) U‐Pb geochronologic survey of the lower parts of the Danube River approaching its Danube delta, Black Sea sink, and a few large tributaries (Tisza, Jiu, Olt, and Siret) originating in the nearby Carpathian Mountains. Samples are modern sediments. DZ age spectra reflect the geology and specifically the crustal age formation of the source area, which in this case is primarily the Romanian Carpathians and their foreland with contributions from the Balkan Mountains to the south of Danube and the East European Craton. The zircon cargo of these rivers suggests a source area that formed during the latest Proterozoic and mostly into the Cambrian and Ordovician as island arcs and back‐arc basins in a Peri‐Gondwanan subduction setting (~600–440 Ma). The Inner Carpathian units are dominated by a U‐Pb DZ peak in the Ordovician (460–470 Ma) and little inheritance from the nearby continental masses, whereas the Outer Carpathian units and the foreland have two main peaks, one Ediacaran (570–610 Ma) and one in the earliest Permian (290–300 Ma), corresponding to granitic rocks known regionally. A prominent igneous Variscan peak (320–350 Ma) in the Danube's and tributaries DZ zircon record is difficult to explain and points out to either an extra Carpathian source or major unknown gaps in our understanding of Carpathian geology. Younger peaks corresponding to arc magmatism during the Alpine period make up as much as about 10% of the DZ archive, consistent with the magnitude and surface exposure of Mesozoic and Cenozoic arcs.
    Description
    Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 19 (2018): 3208-3223, doi:10.1029/2018GC007659.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 19 (2018): 3208-3223
     

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