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    Dike-induced contraction along oceanic and continental divergent plate boundaries

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    Trippanera_et_al-2014-Geophysical_Research_Letters.pdf
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    Type
    Article
    Authors
    Trippanera, D.
    Acocella, V.
    Ruch, Joel
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2014-10-24
    Online Publication Date
    2014-10-24
    Print Publication Date
    2014-10-28
    Permanent link to this record
    http://hdl.handle.net/10754/347007
    
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    Abstract
    The axis of divergent plate boundaries shows extension fractures and normal faults at the surface. Here we present evidence of contraction along the axis of the oceanic ridge of Iceland and the continental Main Ethiopian Rift. Contraction is found at the base of the tilted hanging wall of dilational normal faults, balancing part of their extension. Our experiments suggest that these structures result from dike emplacement. Multiple dike injection induces subsidence above and uplift to the sides of the dikes; the transition in between is accommodated by reverse faults and subsequent peripheral inward dipping normal faults. Our results suggest that contraction is a direct product of magma emplacement along divergent plate boundaries, at various scales, marking a precise evolutionary stage and initiating part of the extensional structures (extension fractures and normal faults). Key Points Contraction along divergent plate boundaries results from dike emplacementContraction generates extensional structures along divergent plate boundariesSurface deformation along divergent plate boundaries may be magma induced
    Citation
    Dike-induced contraction along oceanic and continental divergent plate boundaries 2014, 41 (20):7098 Geophysical Research Letters
    Publisher
    American Geophysical Union (AGU)
    Journal
    Geophysical Research Letters
    DOI
    10.1002/2014GL061570
    Additional Links
    http://doi.wiley.com/10.1002/2014GL061570
    ae974a485f413a2113503eed53cd6c53
    10.1002/2014GL061570
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division

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