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Title: Variations in Gas and Water Pulses at an Arctic Seep: Fluid Sources and Methane Transport

Abstract

Methane fluxes into the oceans are largely dependent on the methane phase as it migrates upward through the sediments. Here we document decoupled methane transport by gaseous and aqueous phases in Storfjordrenna (offshore Svalbard) and propose a three-stage evolution model for active seepage in the region where gas hydrates are present in the shallow subsurface. In a preactive seepage stage, solute diffusion is the primary transport mechanism for methane in the dissolved phase. Fluids containing dissolved methane have high 87Sr/ 86Sr ratios due to silicate weathering in the microbial methanogenesis zone. During the active seepage stage, migration of gaseous methane results in near-seafloor gas hydrate formation and vigorous seafloor gas discharge with a thermogenic fingerprint. In the postactive seepage stage, the high concentration of dissolved lithium points to the contribution of a deeper-sourced aqueous fluid, which we postulate advects upward following cessation of gas discharge.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [2];  [5]
  1. Geological Survey of Norway, Trondheim (Norway); Arctic Univ. of Norway (UiT), Tromsø (Norway)
  2. Oregon State Univ., Corvallis, OR (United States)
  3. Arctic Univ. of Norway (UiT), Tromsø (Norway); The Ohio State Univ., Columbus, OH (United States)
  4. Arctic Univ. of Norway (UiT), Tromsø (Norway)
  5. Geological Survey of Norway, Trondheim (Norway)
Publication Date:
Research Org.:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1539738
Alternate Identifier(s):
OSTI ID: 1436189
Grant/Contract Number:  
FE0013531
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 9; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Geology

Citation Formats

Hong, W. -L., Torres, M. E., Portnov, A., Waage, M., Haley, B., and Lepland, A. Variations in Gas and Water Pulses at an Arctic Seep: Fluid Sources and Methane Transport. United States: N. p., 2018. Web. doi:10.1029/2018gl077309.
Hong, W. -L., Torres, M. E., Portnov, A., Waage, M., Haley, B., & Lepland, A. Variations in Gas and Water Pulses at an Arctic Seep: Fluid Sources and Methane Transport. United States. doi:10.1029/2018gl077309.
Hong, W. -L., Torres, M. E., Portnov, A., Waage, M., Haley, B., and Lepland, A. Thu . "Variations in Gas and Water Pulses at an Arctic Seep: Fluid Sources and Methane Transport". United States. doi:10.1029/2018gl077309. https://www.osti.gov/servlets/purl/1539738.
@article{osti_1539738,
title = {Variations in Gas and Water Pulses at an Arctic Seep: Fluid Sources and Methane Transport},
author = {Hong, W. -L. and Torres, M. E. and Portnov, A. and Waage, M. and Haley, B. and Lepland, A.},
abstractNote = {Methane fluxes into the oceans are largely dependent on the methane phase as it migrates upward through the sediments. Here we document decoupled methane transport by gaseous and aqueous phases in Storfjordrenna (offshore Svalbard) and propose a three-stage evolution model for active seepage in the region where gas hydrates are present in the shallow subsurface. In a preactive seepage stage, solute diffusion is the primary transport mechanism for methane in the dissolved phase. Fluids containing dissolved methane have high 87Sr/86Sr ratios due to silicate weathering in the microbial methanogenesis zone. During the active seepage stage, migration of gaseous methane results in near-seafloor gas hydrate formation and vigorous seafloor gas discharge with a thermogenic fingerprint. In the postactive seepage stage, the high concentration of dissolved lithium points to the contribution of a deeper-sourced aqueous fluid, which we postulate advects upward following cessation of gas discharge.},
doi = {10.1029/2018gl077309},
journal = {Geophysical Research Letters},
number = 9,
volume = 45,
place = {United States},
year = {2018},
month = {4}
}

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Cited by: 5 works
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    Works referencing / citing this record:

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