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Browsing by Author "Fisk, Martin R."
Now showing items 1-20 of 20
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Fisk, Martin R. (American Geophysical Union, 1986-05)The interaction of basalt melt with mantle harzburgite at low pressure might result in silica enrichment of the melt by assimilation of orthopyroxene. Experimental tests of this hypothesis show that silica-rich liquids ( ...
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Fisk, Martin R.; McNeill, Andrew W.; Teagle, Damon A.H.; Furnes, Harald; Bach, Wolfgang (College Station, Tex. : Ocean Drilling Program, Texas A & M University, 1996)Ocean Drilling Program Hole 896A (1°13.01'N, 83°43.39'W) is in 3440 m of water east of the Galapagos Platform in the equatorial eastern Pacific Ocean. At this site in 5.9 Ma crust, basement rocks were recovered over t ...
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Storrie-Lombardi, M. C.; Fisk, Martin R. (American Geophysical Union, 2004-10-15)The alteration of subseafloor volcanic glass from three locations is qualitatively attributed to biological (biotic) or chemical (abiotic) reactions on the basis of microscopic morphology of the boundary between the un ...
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Fisk, Martin R.; Storrie-Lombardi, M. C.; Douglas, S.; Popa, R.; McDonald, G.; Di Meo-Savoie, C. (American Geophysical Union, 2003-12-11)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 basal ...
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Heberling, Cara; Lowell, Robert P.; Liu, lei; Fisk, Martin R. (AGU and the Geochemical Society, 2010-08-03)We estimate the depth of the 120°C isotherm by constructing crustal thermal gradients based on theoretical and observed conductive heat flux as a function of lithospheric age. We chose the 120°C isotherm because it is ...
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Giovannoni, Stephen J.; Fisk, Martin R.; Mullins, Thomas D.; Furnes, Harald (College Station, Tex. : Ocean Drilling Program, Texas A & M University, 1996)The majority of the Earth's shallow crust is composed of basalt that erupted on the seafloor and was subsequently altered by chemical exchange with seawater. One aspect of this alteration is the replacement of glass by ...
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Keller, Randall A.; Fisk, Martin R.; Smellie, John L.; Strelin, Jorge A.; Lawver, Lawrence A. (American Geophysical Union, 2002-08-23)Bransfield Strait is a Quaternary, ensialic back arc basin at the transition from rifting to spreading. Fresh volcanic rocks occur on numerous submarine features distributed along the rift axis, including a discontinuo ...
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Keller, Randall Arthur (1989-10-06)The Bransfield Strait is the narrow, late Tertiary to Quaternary marginal basin separating the South Shetland Islands from the northern end of the Antarctic Peninsula magmatic arc. Quaternary volcanism in the strait is t ...
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Howard, Katherine Jane (1989-01-31)
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Fisk, Martin R.; Thorseth, Ingunn H.; Urbach, Ena; Giovannoni, Stephen J. (College Station, Tex. : Ocean Drilling Program, Texas A & M University, 2000)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 f ...
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Furnes, Harald; Thorseth, Ingunn H.; Tumyr, Ole; Torsvik, Terje; Fisk, Martin R. (College Station, Tex. : Ocean Drilling Program, Texas A & M University, 1996)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 an ...
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Lavalleur, Heather J. (2012-06-15)With rising concentrations of CO₂ in the Earth's atmosphere causing concern about climate change, many solutions are being presented to decrease emissions. One of the proposed solutions is to sequester excess CO₂ in g ...
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Popa, Radu; Smith, Amy; Popa, Rodica; Boone, Jane; Fisk, Martin R. (Mary Ann Liebert, Inc., 2011)The boundary between ice and basalt on Earth is an analog for some near-surface environments of Mars. We investigated neutrophilic iron-oxidizing microorganisms from the basalt-ice interface in a lava tube from the Orego ...
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Keller, Randall A. (1996-02-01)Volcanic rocks from hotspots and island arcs/backarcs typically have enriched trace element and isotopic compositions that contain a contribution from subducted oceanic crust. Isotopic and trace element data suggest th ...
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Storrie-Lombardi, Michael C.; Muller, J.-P.; Fisk, Martin R.; Griffiths, A. D.; Coates, A. J. (American Geophysical Union, 2008-06-20)We investigate the utility of adding a 365 nm ultraviolet (UV) light source to the ExoMars panoramic camera (PanCam) scheduled for launch in 2013. The modification makes it feasible to monitor rover drill cuttings fo ...
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Mason, Olivia Underwood (2008-06-26)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 ...
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Fisk, Martin R.; Giovannoni, Stephen J. (American Geophysical Union, 1999-05-25)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 vers ...
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Nielsen, Mark E.; Fisk, Martin R. (American Geophysical Union, 2010-08-04)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 ...
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Duncan, Robert A.; Fisk, Martin R.; White, William M.; Nielsen, Roger L. (American Geophysical Union, 1994-12-10)The island of Tahiti, the largest in French Polynesia, comprises two major volcanoes aligned NW-SE, parallel with the general trend of the Society Islands hotspot track. Rocks form this volcanic system are basalts transi ...
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Abbott, Dallas; Fisk, Martin R. (American Geophysical Union, 1986-12)We propose alternative mechanisms for the origin of three unusual rock suites, high-Mg andesites, NaTi basalts, and arclike rocks, that have been dredged from the Woodlark basin, southwest Pacific Ocean. We show that the ...
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