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    Tectonic history of the Kolyvan-Tomsk folded zone (KTFZ), Russia: Insight from zircon U/Pb geochronology and Nd isotopes

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    Name:
    Zhimulev_et_al.,_2019_Tectonic ...
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    Description:
    Final Accepted Manuscript
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    Author
    Zhimulev, Fedor I.
    Gillespie, Jack
    Glorie, Stijn
    Jepson, Gilby
    Vetrov, Evgeny V.
    De Grave, Johan
    Affiliation
    Univ Arizona, Dept Geosci
    Issue Date
    2020-03
    Keywords
    Atai-Sayan
    Central Asian Orogenic Belt
    detrital zircon geochronology
    Devonian
    magmatism
    Nd isotope composition
    West Siberia
    
    Metadata
    Show full item record
    Publisher
    WILEY
    Citation
    Zhimulev, FI, Gillespie, J, Glorie, S, Jepson, G, Vetrov, EV, De Grave, J. Tectonic history of the Kolyvan–Tomsk folded zone (KTFZ), Russia: Insight from zircon U/Pb geochronology and Nd isotopes. Geological Journal. 2020; 55: 1913– 1930. https://doi.org/10.1002/gj.3679
    Journal
    GEOLOGICAL JOURNAL
    Rights
    © 2019 John Wiley & Sons, Ltd.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The Kolyvan-Tomsk folded zone (KTFZ) represents part of the Central Asian Orogenic Belt (CAOB). The KTFZ is mainly composed of detrital Late Palaeozoic sedimentary deposits, with minor intrusions. Detrital zircon geochronology on the Upper Devonian to Lower Permian sedimentary sequences of the KTFZ and the associated Gorlovo foreland basin yields four age peaks, reflecting the magmatic events in the source terranes. These events consist of (a) a minor Neoproterozoic peak (0.9-0.7 Ga), (b) a significant Early Palaeozoic peak (550-460 Ma), with a maximum at 500 Ma, and two well-defined Late Palaeozoic peaks during (c) the Middle-Late Devonian (385-360 Ma) and (d) the Carboniferous-Early Permian (360-280 Ma), with a maximum at 320 Ma. Older zircons (>1 Ga) are quite rare in the sampled sedimentary sequences. Slightly negative epsilon Nd values and associated relatively young Nd model ages were obtained (epsilon Nd(T) = -0.78, T (DM) ~1.1 Ga for Upper Devonian sandstones, epsilon Nd(T) = -1.1, T (DM) ~1.1 Ga for Lower Permian sandstones), suggesting only minor contribution of ancient continental crust to the main sedimentary units of the KTFZ. All intrusive and volcaniclastic rocks on the contrary are characterized by high positive epsilon Nd(T) values in the range of 3.78-6.86 and a Late Precambrian model age (T (DM) = 581-916 Ma), which corroborates its juvenile nature and an important depleted mantle component in their source. The oldest unit of the KTFZ, the Bugotak volcanic complex formed at the Givetian-Early Frasnian transition, at about 380 Ma. Upper Devonian detrital deposits of the KTFZ were formed in the Early Palaeozoic accretion belt of the Siberian continent and specifically in a passive continental margin environment. Deposits of the Gorlovo foreland basin, adjoining the KTFZ, were accumulated as a result of erosion of the Carboniferous-Early Permian volcanic rocks, which are now buried under the Meso-Cenozoic sedimentary cover of the West Siberian Basin. The magmatic events, recorded in the KTFZ zircon data, correspond to the most significant magmatic stages that affected the western part of the CAOB as a whole.
    Note
    12 month embargo; published online: 16 November 2019
    ISSN
    0072-1050
    EISSN
    1099-1034
    DOI
    10.1002/gj.3679
    Version
    Final accepted manuscript
    ae974a485f413a2113503eed53cd6c53
    10.1002/gj.3679
    Scopus Count
    Collections
    UA Faculty Publications

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