Cover image for Vol. 14 Issue 3

August 2014

Volume 14, Issue 3

Pages i–i, 251–378

  1. Issue Information

    1. Top of page
    2. Issue Information
    3. Original Articles
    1. Issue Information (page i)

      Version of Record online: 21 JUL 2014 | DOI: 10.1111/gfl.12094

  2. Original Articles

    1. Top of page
    2. Issue Information
    3. Original Articles
    1. Fracture-focused fluid flow in an acid and redox-influenced system: diagenetic controls on cement mineralogy and geomorphology in the Navajo Sandstone (pages 251–265)

      J. H. Bell and B. B. Bowen

      Version of Record online: 4 FEB 2014 | DOI: 10.1111/gfl.12075

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      A morphologically distinct butte located in Southern Utah, in Grand Staircase-Escalante National Monument, has experienced a history of fluid–sediment interactions resulting in anomalous diagenetic iron sulfate (jarosite). We propose that the jarosite cement could have formed from fracture-directed acidic fluids resulting from weathering of proximal, unidentified sulfides, or H2S associated with deep source beds, and along with other secondary cements created an erosion-resistant cap that helped control the butte's geomorphic evolution.

    2. Tectonic evolution of a Paleozoic thrust fault influences the hydrogeology of a fractured rock aquifer, northeastern Appalachian foreland (pages 266–290)

      J. Kim, P. Ryan, K. Klepeis, T. Gleeson, K. North, J. Bean, L. Davis and J. Filoon

      Version of Record online: 19 FEB 2014 | DOI: 10.1111/gfl.12076

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      The Hinesburg thrust juxtaposed hanging wall metamorphic rocks with footwall sedimentary rocks along a ductile fault zone during the Ordovician and was subsequently deformed by three additional tectonic events from the Devonian to the Cretaceous. Aquifers from the hanging wall and footwall have separable groundwater geochemical signatures and low and high well yields, respectively; however, wells drilled through the thrust have groundwater with hanging-wall-dominant or weakly mixed geochemical affinities. A hydrogeologic model involving a low-K hanging wall overlying a high-K footwall, which was modified by later folds and fractures, explains these observations.

    3. The hydrogeochemistry of subsurface brines in and west of the Jordan–Dead Sea Transform fault (pages 291–309)

      P. Möller, E. Rosenthal and A. Flexer

      Version of Record online: 19 FEB 2014 | DOI: 10.1111/gfl.12077

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      By Na/Cl ratios, six different brine events are identified in the Phanerozoic of Israel. The distribution of members from each brine family in different geological units older or younger than the time of brine generation indicates their movement enforced by regional tectonic processes. They were mainly vertically mobilized and mixed with younger brines, brackish or freshwater.

    4. Study of coal gas wettability for CO2 storage and CH4 recovery (pages 310–325)

      A. Saghafi, H. Javanmard and K. Pinetown

      Version of Record online: 14 MAR 2014 | DOI: 10.1111/gfl.12078

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      The gas wettability of coal affects the ease of adsorption and desorption of gases onto and from coal. Using a modified captive gas technique, the magnitude of the ‘receding’ contact angle of CH4, CO2 and N2 bubbles on a bituminous coal in presence of water was studied. The results show that gas wettability is in general higher for CO2 than for CH4 or N2. In most cases, increases in gas-water pressure led to increases in gas wettability of coal.

    5. Hydrothermal monitoring in a quiescent volcanic arc: Cascade Range, northwestern United States (pages 326–346)

      S. E. Ingebritsen, N. G. Randolph-Flagg, K. D. Gelwick, E. A. Lundstrom, I. M. Crankshaw, A. M. Murveit, M. E. Schmidt, D. Bergfeld, K. R. Spicer, D. S. Tucker, R. H. Mariner and W. C. Evans

      Version of Record online: 20 MAR 2014 | DOI: 10.1111/gfl.12079

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      In 2009, the USGS began a systematic hydrothermal-monitoring effort encompassing 25 sites and 10 of the highest-risk volcanoes in the Cascade Range. Targets included summit fumarole groups and springs/streams that show clear evidence of magmatic influence (high 3He/4He ratios and/or anomalous fluxes of magmatic CO2 or heat). The resulting hourly, multiyear records are suitable for retrospective comparison with continuous geophysical monitoring data, and inform ongoing efforts to capture unrest cycles at more active but less accessible volcanoes.

    6. Hydrothermal, multiphase convection of H2O-NaCl fluids from ambient to magmatic temperatures: a new numerical scheme and benchmarks for code comparison (pages 347–371)

      P. Weis, T. Driesner, D. Coumou and S. Geiger

      Version of Record online: 25 MAR 2014 | DOI: 10.1111/gfl.12080

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      We present a new numerical scheme for multiphase convection of salt water at magmatic-hydrothermal conditions based on the control volume finite element method. In a series of benchmarks with HYDROTHERM and TOUGH2, we find very good agreement of the simulated hydrothermal systems. Simulations at high-temperature, high-salinity conditions outside of the range of these models show the influence of solid halite on dynamic flow behavior and suggest that salt from magmatic degassing is not easily vented or accommodated within the crust.

    7. A new apparatus for measuring elastic wave velocity and electrical conductivity of fluid-saturated rocks at various confining and pore-fluid pressures (pages 372–378)

      T. Watanabe and A. Higuchi

      Version of Record online: 15 JUL 2013 | DOI: 10.1111/gfl.12050

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      In order to study the influence of pore-fluid pressure on elastic wave velocity and electrical conductivity, we have built a new apparatus with a pore-fluid pressure control system, which is capable of simultaneously measuring velocity and conductivity. Our new apparatus employs plastic piston-cylinders for the electrical insulation and pore-fluid pressure transmission. The pore-fluid is electrically isolated from the metal work, and its pressure can be precisely controlled without significant contribution of the friction between the piston and cylinder.