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    Significance of Northeast‐Trending Features in Canada Basin, Arctic Ocean (English)

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    In: Geochemistry, Geophysics, Geosystems ; 18 , 11 ; 4156-4178  ; 2017
    • ISSN:
      1525-2027
    • Article (Journal)  /  Electronic Resource

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    Synthesis of seismic velocity, potential field, and geological data from Canada Basin and its surrounding continental margins suggests that a northeast‐trending structural fabric has influenced the origin, evolution, and current tectonics of the basin. This structural fabric has a crustal origin, based on the persistence of these trends in upward continuation of total magnetic intensity data and vertical derivative analysis of free‐air gravity data. Three subparallel northeast‐trending features are described. Northwind Escarpment, bounding the east side of the Chukchi Borderland, extends ∼600 km and separates continental crust of Northwind Ridge from high‐velocity transitional crust in Canada Basin. A second, shorter northeast‐trending zone extends ∼300 km in northern Canada Basin and separates inferred continental crust of Sever Spur from magmatically intruded crust of the High Arctic Large Igneous Province. A third northeast‐trending feature, here called the Alaska‐Prince Patrick magnetic lineament (APPL) is inferred from magnetic data and its larger regional geologic setting. Analysis of these three features suggests strike slip or transtensional deformation played a role in the opening of Canada Basin. These features can be explained by initial Jurassic‐Early Cretaceous strike slip deformation (phase 1) followed in the Early Cretaceous (∼134 to ∼124 Ma) by rotation of Arctic Alaska with seafloor spreading orthogonal to the fossil spreading axis preserved in the central Canada Basin (phase 2). In this model, the Chukchi Borderland is part of Arctic Alaska.

    Many models have been proposed to describe the geologic history of Canada Basin, Arctic Ocean, a remote area of Earth where data collection is hampered by perennial ice cover. Our paper merges new geophysical (primarily seismic) data from the basin that was previously published in 2016 with existing gravity, magnetic, and known geology from samples to propose that (a) a northeast‐trending structural fabric exists in the basin, and (b) this fabric arises from strike‐slip or transtensional motion during basin formation. This new model has many testable attributes.

    Three northeast‐trending linear structural zones of roughly 300 to >1,000 km exist in Canada Basin. These zones suggest the importance of a long‐lived strike slip or transtensional fabric in the evolution of Canada Basin. A two‐phase model is proposed in which rifting with large strike‐slip components is followed by a change in deformation direction with rotational seafloor spreading.

    Table of contents – Volume 18, Issue 11

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    The tables of contents are generated automatically and are based on the data records of the individual contributions available in the index of the TIB portal. The display of the Tables of Contents may therefore be incomplete.

    3739
    Issue Information
    | 2017
    3741
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    3801
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    3840
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    3854
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    3869
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    3891
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    3904
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    3910
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    3929
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    3964
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    3976
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    4000
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    4016
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    4027
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    4043
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    4055
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    4074
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    4096
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    4110
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    4123
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    Degruyter, W. / Huber, C. / Bachmann, O. / Cooper, K. M. / Kent, A. J. R. et al. | 2017
    4136
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    4156
    Significance of Northeast‐Trending Features in Canada Basin, Arctic Ocean
    Hutchinson, D. R. / Jackson, H. R. / Houseknecht, D. W. / Li, Q. / Shimeld, J. W. / Mosher, D. C. / Chian, D. / Saltus, R. W. / Oakey, G. N. et al. | 2017
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    4235
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