Skip to content
University of Maryland LibrariesDigital Repository at the University of Maryland
    • Login
    View Item 
    •   DRUM
    • Theses and Dissertations from UMD
    • UMD Theses and Dissertations
    • View Item
    •   DRUM
    • Theses and Dissertations from UMD
    • UMD Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Lithospheric Extension on Venus: how to form narrow rifts

    Thumbnail
    View/Open
    Martone_umd_0117N_17817.pdf (18.31Mb)
    No. of downloads: 141

    Date
    2017
    Author
    Martone, Alexis Ann
    Advisor
    Montesi, Laurent G. J.
    DRUM DOI
    https://doi.org/10.13016/M2XZ93
    Metadata
    Show full item record
    Abstract
    The Venusian rifts of Devana and Ganis Chasmata have been noted for their similar morphology to some rifts on Earth (i.e., the East African rift system). These are narrow rifts that are associated with localized deformation. This thesis aims to explore the link between lithospheric structure and rift style using a force analysis model, following previous work by Buck (1991), in order to determine under what conditions narrow rifts are predicted for Venus conditions. Results for two cases, one using a constant lithospheric thermal conductivity and another using a depth dependent thermal conductivity, are initially determined; Devana and Ganis Chasmata are predicted to be wide rifts rather than narrow rifts. Lithospheric weakening mechanisms (rheological weakening and diking) are implemented to determine their effect on localizing deformation and, thus, forming narrow rifts. Diking did not produce any effect on forming narrow rifts. Rheological weakening, likely due to a combination of melt and a transition to grain size sensitive creep, appears necessary to produce narrow rifts.
    URI
    http://hdl.handle.net/1903/19322
    Collections
    • Geology Theses and Dissertations
    • UMD Theses and Dissertations

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility
     

     

    Browse

    All of DRUMCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister
    Pages
    About DRUMAbout Download Statistics

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility