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Filtering by: Creator Thorseth, Ingunn H. Remove constraint Creator: Thorseth, Ingunn H. Language English [eng] Remove constraint Language: English [eng]

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  • Investigation of microorganisms and DNA from subsuface thermal water and rock from the east flank of Juan de Fuca Ridge

    Creator:
    Fisk, Martin R., Thorseth, Ingunn H., Urbach, Ena, and Giovannoni, Stephen J.
    Abstract:
    During Leg 168 of the Ocean Drilling Program, basalts were recovered by drilling and subsurface water was collected with a water sampling tool at Hole 1026B on the east flank of Juan de Fuca Ridge. Microorganisms were found in both types of samples. The microorganisms in the basalt appear to...
    Resource Type:
    Article
    Full Text:
    FUCA RIDGE1 Martin R. Fisk,2 Ingunn H. Thorseth,3 Ena Urbach,4 and Stephen J. Giovannoni4 ABSTRACT

  • Microbial activity in the alteration of glass from pillow lavas from hole 896a

    Creator:
    Furnes, Harald, Thorseth, Ingunn H., Tumyr, Ole, Torsvik, Terje, and Fisk, Martin R.
    Abstract:
    Within the altered parts of the glass rim of pillow lavas of Hole 896A, at depths at least 432 m below seafloor (237 m below the top of volcanic basement), microbes have been identified. This is indicated by the size and shapes of alteration textures and verified by the presence...
    Resource Type:
    Article
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    FROM HOLE 896A1 Harald Furnes,2 Ingunn H. Thorseth,2 Ole Tumyr,2 Terje Torsvik,3 and Martin R. Fisk4

  • Tsunami Loading on Coastal Infrastructure

    Creator:
    Xie, Zhongliang
    Abstract:
    The safety of coastal infrastructure has been a concern after the Indian Ocean Tsunami in 2004 and the Great East Japan Tsunami in 2011. The western coast of the United States is also exposed to tsunami hazards due to the Cascadia subduction zone. Therefore, it is critical to design coastal...
    Resource Type:
    Dissertation
    Full Text:
    Coastal Infrastructure Abstract approved: Michael H. Scott The safety of coastal infrastructure has

  • Experimental abiotic alteration of igneous and manufactured glasses

    Creator:
    Fisk, Martin R., Crovisier, Jean-Louis, and Honnorez, Jose
    Abstract:
    Microchannels in ocean basalt glass are often attributed to the activity of microorganisms, however, neither the mechanism of formation of microchannels in glass nor the involvement of microorganisms have been confirmed by experimentation. Experimental abiotic corrosion of basalt glass with 1% hydrofluoric acid (HF), a proxy for more slowly acting...
    Resource Type:
    Article
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    Furnes, H, Muehlenbachs, K, Torsvik, T, Thorseth, IH, Tumyr, O, (2001b) Microbial 432 fractionation of

  • Sources of nutrients and energy for a deep biosphere on Mars

    Creator:
    Fisk, Martin R. and Giovannoni, Stephen J.
    Abstract:
    Hydrothermal vents appear to be the tip of the subsurface biosphere in the ocean crust. The primary prducers in this biosphere are prokaryotes that tolerate a wide variety of physical and chemical conditions and are versatile in their use of inorganic compounds to drive metabolism. A synthesis of chemical and...
    Resource Type:
    Article
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    , 1994. Fisk, M. R., S. J. Giovannoni, E. Urbach, and I. H. Thorseth, Microbial weathering of the

  • Prokaryotes associated with marine crust

    Creator:
    Mason, Olivia Underwood
    Abstract:
    Oceanic crust covers nearly 70% of the Earth's surface, of which, the upper, sediment layer is estimated to harbor substantial microbial biomass. Marine crust; however, extends several kilometers beyond this surficial layer, and includes the basalt and gabbro layers. In particular, the basalt layer has high permeabilities which allows for...
    Resource Type:
    Dissertation
    Full Text:
    in Archean Pillow Lavas. Science 304: 578-581. 10 Furnes, H., Staudigel, H., Thorseth, I.H

  • Microbial alteration of the seafloor

    Creator:
    Josef, Jennifer A.
    Abstract:
    In the early 1980's the first evidence of biological alteration of basalt glass (sideromelane) was published. Since that time additional evidence, including DNA staining, isotopic abundance and chemical mapping, has come to light suggesting that this unique alteration of glass can be attributed to microbial activity. Microbial alteration textures have...
    Resource Type:
    Masters Thesis
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    glass. In 1992 Thorseth and co-workers provided a viable mechanism for microbial alteration. They

  • Surface area measurements of marine basalts: Implications for the subseafloor microbial biomass

    Creator:
    Nielsen, Mark E. and Fisk, Martin R.
    Abstract:
    These first measurements of specific surface area (SSA) of bulk samples of subsurface marine basalts were undertaken to determine the potential area available for microbial colonization. SSA ranged from 0.3 to 52 m2/g of basalt with the lowest value coming from pillow basalt and the highest value from breccia. The...
    Resource Type:
    Article
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    . Einen, J., I. H. Thorseth, and L. Ovreas (2008), Enumeration of Archaea and Bacteria in seafloor basalt

  • 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:
    ., 2006; Storrie-Lombardi and Fisk, 2004; Thorseth et al., 2001; Thorseth et al., 1998; Thorseth et al

  • Evidence of biological activity in Hawaiian subsurface basalts

    Creator:
    Fisk, Martin R., Storrie-Lombardi, M. C., Douglas, S., Popa, R., McDonald, G., and Di Meo-Savoie, C.
    Abstract:
    The Hawaii Scientific Drilling Program (HSDP) cored and recovered igneous rock from the surface to a depth of 3109 m near Hilo, Hawaii. Much of the deeper parts of the hole is composed of hyaloclastite (fractured basalt glass that has been cemented in situ with secondary minerals). Some hyaloclastite units...
    Resource Type:
    Article
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    outcrop of hyaloclastite from an Icelandic subglacial eruption [Thorseth et al., 1992]. Further evidence