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    Detrital Zircon Record of a Mesozoic Collisional Forearc Basin in South Central Alaska: The Tectonic Transition From an Oceanic to Continental Arc

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    Author
    Goddard, Andrea L. Stevens
    Trop, Jeffrey M.
    Ridgway, Kenneth D.
    Affiliation
    Univ Arizona, Dept Geosci
    Issue Date
    2018-01-06
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Stevens Goddard, A. L., Trop, J. M., & Ridgway, K. D. (2018). Detrital zircon record of a Mesozoic collisional forearc basin in south central Alaska: The tectonic transition from an oceanic to continental arc. Tectonics, 37, 529–557. https://doi.org/10.1002/2017TC004825
    Journal
    TECTONICS
    Rights
    © 2018. 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
    The collision of oceanic arcs with continental margins is an important mechanism for the growth of continents. Ancient forearc basin strata in collisional orogens provide a record of the upper crustal response to this tectonic process. In south central Alaska, Mesozoic forearc basin strata are exposed in a complete crustal section. U-Pb detrital zircon geochronology from the forearc basin strata was analyzed within a similar to 107Ma stratigraphic framework. The Jurassic strata contain unimodal detrital zircon populations that become progressively younger upsection and range from 175 to 151Ma. These strata are derived from the active oceanic Talkeetna arc. The Cretaceous strata were deposited above multiple unconformities that collectively represent as much as similar to 30Ma of nondeposition and/or erosion in the forearc basin. Erosion in the forearc basin and a general absence of detrital zircon ages between 140 and 120Ma are interpreted as a hiatus of magmatism triggered by collision of the oceanic arc with the former continental margin. The Cretaceous strata have two main detrital zircon populations: a Cretaceous population ranging from 90 to 68Ma that becomes progressively younger upsection and a Jurassic population with a broad range of peak ages from 194 to 144Ma. The Cretaceous population marks the establishment of an active Cretaceous continental arc following the collisional event, and the older population reflects continued erosion of the remnant Jurassic oceanic arc plutons. Our results show that detrital zircon geochronology provides a powerful approach for delineating stages of forearc basin collision and the erosion of multiple magmatic arcs.
    Note
    6 month embargo; published online: 06 January 2018
    ISSN
    0278-7407
    1944-9194
    DOI
    10.1002/2017TC004825
    Version
    Final published version
    Sponsors
    National Science Foundation [EAR-0910945, EAR-0910545]; NSF graduate research fellowship
    Additional Links
    https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2017TC004825
    ae974a485f413a2113503eed53cd6c53
    10.1002/2017TC004825
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