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    Beveling the Colorado Plateau: Early Mesozoic Rift-Related Flexure Explains Erosion and Anomalous Deposition in the Southern Cordilleran Foreland Basin

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    Author
    Chapman, J.B.
    DeCelles, P.G.
    Affiliation
    Department of Geosciences, University of Arizona
    Issue Date
    2021
    Keywords
    Dakota
    flexure
    foreland basin
    Morrison
    rift
    unconformity
    
    Metadata
    Show full item record
    Publisher
    Blackwell Publishing Ltd
    Citation
    Chapman, J. B., & DeCelles, P. G. (2021). Beveling the Colorado Plateau: Early Mesozoic Rift-Related Flexure Explains Erosion and Anomalous Deposition in the Southern Cordilleran Foreland Basin. Tectonics, 40(6).
    Journal
    Tectonics
    Rights
    © 2021 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
    Deposition of the Late Jurassic Morrison Formation in a back-bulge depozone and formation of the overlying sub-Cretaceous unconformity above a forebulge mark the birth of the foreland basin system in the central U.S. Cordillera. In the southern U.S. Cordillera, the Morrison Formation is either anomalously thick or absent and the sub-Cretaceous unconformity cuts out progressively older stratigraphy toward the south on the Colorado Plateau. Based on results of 2D and 3D flexural modeling, we suggest that flexural uplift of the northern rift flank of the Bisbee segment of the Borderland Rift Belt can explain these observations. Structural restoration of the sub-Cretaceous unconformity indicates a minimum of 1.5 km of uplift and flexural models with an effective elastic thickness of 55 ± 5 km can reproduce the geometry of the unconformity and rift flank. This implies that effective elastic thickness has decreased between the Jurassic and the present, consistent with hypotheses for uplift and modification of the Colorado Plateau lithosphere during the Late Mesozoic to Cenozoic. Modeling results also predict the presence of a rift-related flexural trough in the Four Corners region of the Colorado Plateau, which may explain above-average thickness of the Morrison Formation. Constructive interference between a flexural back-bulge depozone and a flexural rift-flank trough may help explain anomalously high Late Jurassic subsidence. © 2021. American Geophysical Union. All Rights Reserved.
    Note
    6 month embargo; first published: 25 May 2021
    ISSN
    0278-7407
    DOI
    10.1029/2020TC006517
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1029/2020TC006517
    Scopus Count
    Collections
    UA Faculty Publications

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