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    Zircon, titanite, and apatite (U-Th)/He ages and age-eU correlations from the Fennoscandian Shield, southern Sweden

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    Guenthner_et_al-2017-Tectonics.pdf
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    Author
    Guenthner, William R. cc
    Reiners, Peter W.
    Drake, Henrik
    Tillberg, Mikael
    Affiliation
    Univ Arizona, Dept Geosci
    Issue Date
    2017-07
    Keywords
    zircon (U-Th)
    He
    Fennoscandian Shield
    radiation damage
    thermochronology
    Titanite (U-Th)
    
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    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Zircon, titanite, and apatite (U-Th)/He ages and age-eU correlations from the Fennoscandian Shield, southern Sweden 2017, 36 (7):1254 Tectonics
    Journal
    Tectonics
    Rights
    ©2017. American Geophysical Union. All Rights Reserved.
    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
    Craton cores far from plate boundaries have traditionally been viewed as stable features that experience minimal vertical motion over 100-1000Ma time scales. Here we show that the Fennoscandian Shield in southeastern Sweden experienced several episodes of burial and exhumation from similar to 1800Ma to the present. Apatite, titanite, and zircon (U-Th)/He ages from surface samples and drill cores constrain the long-term, low-temperature history of the Laxemar region. Single grain titanite and zircon (U-Th)/He ages are negatively correlated (104-838Ma for zircon and 160-945Ma for titanite) with effective uranium (eU=U+0.235xTh), a measurement proportional to radiation damage. Apatite ages are 102-258Ma and are positively correlated with eU. These correlations are interpreted with damage-diffusivity models, and the modeled zircon He age-eU correlations constrain multiple episodes of heating and cooling from 1800Ma to the present, which we interpret in the context of foreland basin systems related to the Neoproterozoic Sveconorwegian and Paleozoic Caledonian orogens. Inverse time-temperature models constrain an average burial temperature of similar to 217 degrees C during the Sveconorwegian, achieved between 944Ma and 851Ma, and similar to 154 degrees C during the Caledonian, achieved between 366Ma and 224Ma. Subsequent cooling to near-surface temperatures in both cases could be related to long-term exhumation caused by either postorogenic collapse or mantle dynamics related to the final assembly of Rodinia and Pangaea. Our titanite He age-eU correlations cannot currently be interpreted in the same fashion; however, this study represents one of the first examples of a damage-diffusivity relationship in this system, which deserves further research attention.
    Note
    6 month embargo; published online: 15 July 2017
    ISSN
    02787407
    DOI
    10.1002/2017TC004525
    Version
    Final published version
    Additional Links
    http://doi.wiley.com/10.1002/2017TC004525
    ae974a485f413a2113503eed53cd6c53
    10.1002/2017TC004525
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