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    Tectonic structure of the Mid-Atlantic Ridge near 16°30′N

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    Parnell-Turner_et_al-2016-Geochemistry,_Geophysics,_Geosystems.pdf (12.63Mb)
    Date
    2016-10-22
    Author
    Parnell-Turner, Ross  Concept link
    Schouten, Hans A.  Concept link
    Smith, Deborah K.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8641
    As published
    https://doi.org/10.1002/2016GC006514
    DOI
    10.1002/2016GC006514
    Keyword
     Mid-Ocean Ridge; Oceanic detachment fault; Crustal accretion; Gravity anomalies; Magnetic anomalies 
    Abstract
    The 16°30'N area of the Mid-Atlantic Ridge represents an area of present-day detachment faulting. Here we present shipboard bathymetric, magnetic and gravity data acquired up to 65 km from the ridge axis that reveal a varied tectonic history of this region. Magnetic data are used to calculate spreading rates and examine spreading rate variability along and across the axis. Bathymetric and gravity data are used to infer the crustal structure. A central magnetic anomaly 40% narrower than expected is observed along much of the study area. Misalignment between modern-day spreading center and magnetic anomalies indicates tectonic reorganization of the axis within the past 780 ka. Observed magnetic anomalies show a pattern of anomalous skewness consistent with rotation of magnetic vectors probably associated with detachment faulting. Relatively thin crust north of a small (∼7 km) nontransform offset coincides with a weakly magmatic spreading axis. In contrast, to the south a robust axial volcanic ridge is underlain by thicker crust. Variations in crustal structure perpendicular to the axis occur over tens of kilometers, indicating processes which occur over timescales of 1–2 Ma.
    Description
    Author Posting. © American Geophysical Union, 2016. 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 17 (2016): 3993–4010, doi:10.1002/2016GC006514.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry, Geophysics, Geosystems 17 (2016): 3993–4010
     

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