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  • Magmatic processes beneath mid-ocean ridges : insights from mineral and glass chemistry in plagioclase ultraphyric basalts

    Creator:
    Lange, Amy E.
    Abstract:
    Prior to eruption at mid-ocean ridges, melts must travel through >6 km of crust from their origin in the mantle. The final composition of the melts is dependent on both the melting conditions and magmatic processes within the crust. While mid-ocean ridge basalt (MORB) glasses are commonly used to infer...
    Resource Type:
    Dissertation
    Full Text:
    processes within the crust. While mid-ocean ridge basalt (MORB) glasses are commonly used to infer melting

  • Helium isotope variations in peridotite, gabbro and basalt from the Kane Oceanic Core Complex

    Creator:
    Konrad, Kevin
    Abstract:
    The Kane Oceanic Core Complex (OCC) is a valuable window into crustal architecture and chemical composition of the lithosphere beneath a slow-spreading ocean ridge. A suite of > 30 samples (comprised of whole rocks, mineral separates and basalt glasses) has been analyzed for ³He/⁴He isotope ratios and He concentrations. Gas...
    Resource Type:
    Masters Thesis
    Full Text:
    October 5, 2012 Title: Helium Isotope Variations in Peridotite, Gabbro and Basalt from the Kane

  • Biotic alteration of oceanic basalt glass

    Creator:
    Drinnan, Megan R.
    Abstract:
    The subsurface microbial biosphere in the igneous oceanic crust has implications for global geochemical cycling, early life on Earth, and the search for life on Mars. Microscopic evidence of a subsurface microbial ecosystem includes biotic alteration textures associated with basaltic glass. The exact conditions in the basaltic layer that make...
    Resource Type:
    Masters Thesis
    Full Text:
    Biotic Alteration of Oceanic Basalt Glass