Journal ArticleDOI
Methane and hydrogen in East Pacific Rise hydrothermal fluids
J. A. Welhan,H. Craig +1 more
TLDR
Recently discovered hydrothermal vents at 21°N on the East Pacific Rise are discharging turbid waters at up to 400°C; mixtures of the plumes with ambient seawater contain significant amounts of dissolved H2 and CH4as well as He as discussed by the authors.Abstract:
Recently discovered hydrothermal vents at 21°N on the East Pacific Rise are discharging turbid waters at up to 400°C; mixtures of the plumes with ambient seawater contain significant amounts of dissolved H2 and CH4as well as He. The first grab samples of these waters were diluted 50-100 foldbut they contained as much as 20 × 10−5 cc(STP) of H2 and 2 × 10−5 cc(STP) of CH4 per gram of water. H2/CH4 ratios in the vents increase with temperaturea result that is tentatively attributed to chemical equilibrium and/or the redox state of the individual waters. The phase diagram for the NaCl-H2O "surrogate-seawater" system shows that liquid-vapor separation may take place prior to dischargeand mixing of a vapor phase with entrained cooler sea-water would profoundly alter original concentrations of volatiles as well as dissolved salts. H2 and CH4 ratios to basalt-derived helium are respectively about 550 and 70 in these waters. The total fluxes from the world-ocean ridge systemestimated from the He-3 fluxare of the order of 1.3 × 109 m³/y for H2 and 1.6 × 108 m³/y for CH4. The CH4 flux so calculated is sufficient to replace the deep-sea methane in ∼ 30 yearsimplying a very rapid bacterial consumption rate below the thermocline.read more
Citations
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Journal ArticleDOI
Biogeochemical aspects of atmospheric methane
TL;DR: In this paper, the authors identify and evaluate several constraints on the budget of atmospheric methane, its sources, sinks and residence time, and construct a list of sources and sinks, identities, and sizes.
Journal ArticleDOI
Oceanic methane biogeochemistry.
TL;DR: It is shown that thermodynamic and kinetic constraints largely prevent large-scale methanogenesis in the open ocean water column, and the role of anaerobic oxidation of methane has changed from a controversial curiosity to a major sink in anoxic basins and sediments.
Journal ArticleDOI
East Pacific Rise: Hot Springs and Geophysical Experiments
Fred N. Spiess,Ken C. Macdonald,Tanya Atwater,Robert D. Ballard,A. Carranza,D. Cordoba,C. Cox,V. M. Diaz Garcia,J. Francheteau,José Manuel Crespo Guerrero,James W. Hawkins,Rachel M. Haymon,Robert R. Hessler,Tierre Juteau,Miriam Kastner,Roger L. Larson,Bruce P. Luyendyk,J. D. Macdougall,Stanley L. Miller,William R. Normark,John A. Orcutt,Claude Rangin +21 more
TL;DR: High-resolution determinations of crustal properties along the spreading center were made to gain knowledge of the source of new oceanic crust and marine magnetic anomalies, the nature of the axial magma chamber, and the depth of hydrothermal circulation.
Journal ArticleDOI
Abiogenic formation of alkanes in the Earth's crust as a minor source for global hydrocarbon reservoirs
TL;DR: The progressive isotopic trends for the series of C1–C4 alkanes indicate that hydrocarbon formation occurs by way of polymerization of methane precursors, and it can now be rule out the presence of a globally significant abiogenic source of hydrocarbons.
References
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Journal ArticleDOI
Primordial neon, helium, and hydrogen in oceanic basalts
Harmon Craig,John E. Lupton +1 more
TL;DR: A primordial neon component in neon from Kilauea Volcano and deep-sea tholeiite glass has been identified by the presence of excess 20Ne; relative to atmospheric neon the 20Ne enrichments are 54% in Kilea neon and about 25% in the basalts The 20Ne anomalies are associated with high 3He/4He ratios.
Journal ArticleDOI
The system H 2 O-NaCl at elevated temperatures and pressures
S. Sourirajan,G.C. Kennedy +1 more
TL;DR: In this paper, the system H/sub 2/O-NaCI was studied at pressures to 1240 bars and temperatures of 250 to 700 ts C. The temperature and pressure of the gas-solid liquid boundary curve were determined, and the solubility of solid NaCI in steam up to saturation pressures was measured.
Journal ArticleDOI
Excess 3He in deep water on the East Pacific Rise
TL;DR: In this article, the authors show that water on the crest and flanks of the East Pacific Rise has the highest enrichment in 3He so far observed in the oceans; the 3He/4He ratio anomaly relative to atmospheric helium is + 32% at the mid-depth maximum in the profiles.
Journal ArticleDOI
Excess 3He in oceanic basalts: Evidence for terrestrial primordial helium
John E. Lupton,Harmon Craig +1 more
TL;DR: The 3 He/4 He ratio in basalt glass is the same as the isotope ratio of the excess helium in Pacific Ocean deep water, supporting the theory that the atmospheric escape rate of 3 He is balanced by a flux of primordial 3 He from the mantle as discussed by the authors.
Journal ArticleDOI
Excess 3 He and 4 He in Galapagos submarine hydrothermal waters
TL;DR: In this article, the authors summarise 37 measurements of excess helium in hydrothermal waters sampled using the Alvin deep submersible at the Galapagos Spreading Centre during February and March of 1977.
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