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Creator:: Hulme, Samuel M., Wheat, C. Geoffrey, Coggon, Rosalind M., and McManus, James
Abstract:: The data presented in this report demonstrate significant improvements in the ability to constrain trace element and Sr isotopic concentrations in sediments overlying ridge-flank hydrothermal systems. Improved sampling methods orchestrated by the Integrated Ocean Drilling Program (i.e., advanced piston coring and anoxic sample processing) enabled the collection of reactive pore...
Resource Type:: Article
Full Text:: | Volume 301 Fisher, A.T., Urabe, T., Klaus, A., and the Expedition 301 Scientists Proceedings of the

Creator:: Wheat, C. Geoffrey and McManus, James
Abstract:: We present concentrations of germanium and silicon in sediment pore waters, basaltic formation fluids, and bulk sediment from three ridge flank hydrothermal systems (RFHS). Basaltic formation fluids from warm (>30°C) RFHS have much higher Ge concentrations and Ge:Si molar ratios than overlying sediment pore waters, requiring seawater-basalt reactions to dominate...
Resource Type:: Article
Full Text:: fluids C. Geoffrey Wheat Global Undersea Research Unit, University of Alaska Fairbanks, P.O. Box 475

Creator:: Wheat, C. Geoffrey, McManus, James, Mottl, Michael J., and Giambalvo, Emily
Abstract:: We present a new estimate for the crustal phosphorous sink that results from reactions among seawater, basalt, and sediment blanketing low temperature mid-ocean ridge flank hydrothermal systems. New estimates for global hydrothermal power output, sediment thickness, and the dissolved phosphate concentrations in basement formation fluids indicate that fluid flow through...
Resource Type:: Article
Full Text:: -ocean ridge flank hydrothermal sink C. Geoffrey Wheat,1 James McManus,2 Michael J. Mottl,3 and Emily

Creator:: McManus, James, Nägler, Thomas F., Siebert, Christopher, Wheat, C. Geoffrey, and Hammond, Douglas E.
Abstract:: Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. δ⁹⁸/⁹⁵Mo in these fluids range from 0.8 to 3.5%₀ (relative to a laboratory standard), demonstrating that marine sedimentary reactions significantly fractionate Mo isotopes. Within...
Resource Type:: Article
Full Text:: , Switzerland (naegler@geo.unibe.ch; siebert@geo.unibe.ch) C. Geoffrey Wheat Global Undersea Research Unit, P.O

Creator:: Wheat, C. Geoffrey, McManus, James, Dymond, Jack, Collier, Robert W., and Whiticar, Michael
Abstract:: We present evidence for pore water flow through the sediment of Crater Lake, Oregon based on systematic variations in pore water chemical compositions and thermal gradients. Pore water was extracted from sediment by centrifugation and diffusive exchange using a gravity corer deployed from a surface vessel and a box corer...
Resource Type:: Article
Full Text:: , Oregon: Pore water and heat flow constraints C. Geoffrey Wheat • Institute of Marine Sciences

Creator:: McManus, James, Collier, Robert W., Dymond, Jack, Wheat, C. Geoffrey, and Larson, Gary L.
Abstract:: Small temporal and spatial variations in the distribution of dissolved oxygen in Crater Lake, Oregon, are used to estimate the mean age of the lake’s deep water, the flux of labile organic carbon to the deep lake, and the influence of hydrothermal activity on the concentration of dissolved oxygen within...
Resource Type:: Article
Full Text:: corresponds to a mean deep water residence time of 2-4 yr. The deep-water oxygen consumption rate is 2 l-26

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