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    Tectonic evolution of 200 km of Mid-Atlantic Ridge over 10 million years : interplay of volcanism and faulting

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    Date
    2015-07-22
    Author
    Cann, Johnson R.  Concept link
    Smith, Deborah K.  Concept link
    Escartin, Javier E.  Concept link
    Schouten, Hans A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7537
    As published
    https://doi.org/10.1002/2015GC005797
    DOI
    10.1002/2015GC005797
    Keyword
     Slow spreading ridges; Mid-Atlantic Ridge; Detachment faults 
    Abstract
    We reconstruct the history of the mode of accretion of an area of the Mid-Atlantic Ridge south of the Kane fracture zone using bathymetric morphology. The area includes 200 km of the spreading axis and reaches to 10 Ma on either side. We distinguish three tectonic styles: (1) volcanic construction with eruption and intrusion of magma coupled with minor faulting, (2) extended terrain with abundant large-offset faults, (3) detachment faulting marked by extension on single long-lived faults. Over 40% of the seafloor is made of extended terrain and detachment faults. The area includes products of seven spreading segments. The spreading axis has had detachment faulting or extended terrain on one or both sides for 70% of the last 10 Ma. In some parts of the area, regions of detachment faulting and extended terrain lie close to segment boundaries. Regions of detachment faulting initiated at 10 Ma close to the adjacent fracture zones to the north and south, and then expanded away from them. We discuss the complex evidence from gravity, seismic surveys, and bathymetry for the role of magma supply in generating tectonic style. Overall, we conclude that input of magma at the spreading axis has a general control on the development of detachment faulting, but the relationship is not strong. Other factors may include a positive feedback that stabilizes detachment faulting at the expense of volcanic extension, perhaps through the lubrication of active detachment faults by the formation of low friction materials (talc, serpentine) on detachment fault surfaces.
    Description
    Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 16 (2015): 2303-2321, doi:10.1002/2015GC005797.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 16 (2015): 2303-2321
     

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