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    Crustal magnetization and the subseafloor structure of the ASHES vent field, Axial Seamount, Juan de Fuca Ridge : implications for the investigation of hydrothermal sites

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    Tontini_et_al-2016-Geophysical_Research_Letters.pdf (3.487Mb)
    Date
    2016-06-24
    Author
    Tontini, F. Caratori  Concept link
    Crone, Timothy J.  Concept link
    de Ronde, Cornel E. J.  Concept link
    Fornari, Daniel J.  Concept link
    Kinsey, James C.  Concept link
    Mittelstaedt, Eric  Concept link
    Tivey, Maurice A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8423
    As published
    https://doi.org/10.1002/2016GL069430
    DOI
    10.1002/2016GL069430
    Keyword
     ASHES vent field; Crustal magnetization; Sentry AUV 
    Abstract
    High-resolution geophysical data have been collected using the Autonomous Underwater Vehicle (AUV) Sentry over the ASHES (Axial Seamount Hydrothermal Emission Study) high-temperature (~348°C) vent field at Axial Seamount, on the Juan de Fuca Ridge. Multiple surveys were performed on a 3-D grid at different altitudes above the seafloor, providing an unprecedented view of magnetic data resolution as a function of altitude above the seafloor. Magnetic data derived near the seafloor show that the ASHES field is characterized by a zone of low magnetization, which can be explained by hydrothermal alteration of the host volcanic rocks. Surface manifestations of hydrothermal activity at the ASHES vent field are likely controlled by a combination of local faults and fractures and different lava morphologies near the seafloor. Three-dimensional inversion of the magnetic data provides evidence of a vertical, pipe-like upflow zone of the hydrothermal fluids with a vertical extent of ~100 m.
    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 Geophysical Research Letters 43 (2016): 6205–6211, doi:10.1002/2016GL069430.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geophysical Research Letters 43 (2016): 6205–6211
     

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