Origin and Transformation of Light Hydrocarbons Ascending at an Active Pockmark on Vestnesa Ridge, Arctic Ocean
Abstract
Abstract We report on the geochemistry of hydrocarbons and pore waters down to 62.5 mbsf, collected by drilling with the MARUM‐MeBo70 and by gravity coring at the Lunde pockmark in the Vestnesa Ridge. Our data document the origin and transformations of volatiles feeding gas emissions previously documented in this region. Gas hydrates are present where a fracture network beneath the pockmark focusses migration of thermogenic hydrocarbons characterized by their C 1 /C 2+ and stable isotopic compositions (δ 2 H‐CH 4 , δ 13 C‐CH 4 ). Measured geothermal gradients (~80 °C/km) and known formation temperatures (>70 °C) suggest that those hydrocarbons are formed at depths >800 mbsf. A combined analytical/modeling approach, including concentration and isotopic mass balances, reveals that pockmark sediments experience diffuse migration of thermogenic hydrocarbons. However, at sites without channeled flow this appears to be limited to depths >~50 mbsf. At all sites we document a contribution of microbial methanogenesis to the overall carbon cycle that includes a component of secondary carbonate reduction—that is, reduction of dissolved inorganic carbon generated by anaerobic oxidation of methane in the uppermost methanogenic zone. Anaerobic oxidation of methane and carbonate reduction rates are spatially variable within the pockmark and are highestmore »
- Authors:
-
[1];
[2];
[3];
[4];
[5];
[2];
[1];
[1];
[5];
[5];
[1]
- MARUM—Center for Marine Environmental Sciences and Department of Geosciences University of Bremen Bremen Germany
- Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences UiT—The Arctic University of Norway Tromsø Norway
- Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences UiT—The Arctic University of Norway Tromsø Norway, Geological Survey of Norway Trondheim Norway
- College of Earth Ocean and Atmospheric Sciences Oregon State University Corvallis OR USA
- GEOMAR—Helmholtz Centre for Ocean Research Kiel Germany
- Publication Date:
- Research Org.:
- Oregon State Univ., Corvallis, OR (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1582501
- Alternate Identifier(s):
- OSTI ID: 1582503; OSTI ID: 1799760
- Grant/Contract Number:
- DE‐FE0013531; FE0013531
- Resource Type:
- Published Article
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Name: Journal of Geophysical Research. Solid Earth Journal Volume: 125 Journal Issue: 1; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Geochemistry & Geophysics
Citation Formats
Pape, T., Bünz, S., Hong, W. ‐L., Torres, M. E., Riedel, M., Panieri, G., Lepland, A., Hsu, C. ‐W., Wintersteller, P., Wallmann, K., Schmidt, C., Yao, H., and Bohrmann, G. Origin and Transformation of Light Hydrocarbons Ascending at an Active Pockmark on Vestnesa Ridge, Arctic Ocean. United States: N. p., 2020.
Web. doi:10.1029/2018JB016679.
Pape, T., Bünz, S., Hong, W. ‐L., Torres, M. E., Riedel, M., Panieri, G., Lepland, A., Hsu, C. ‐W., Wintersteller, P., Wallmann, K., Schmidt, C., Yao, H., & Bohrmann, G. Origin and Transformation of Light Hydrocarbons Ascending at an Active Pockmark on Vestnesa Ridge, Arctic Ocean. United States. https://doi.org/10.1029/2018JB016679
Pape, T., Bünz, S., Hong, W. ‐L., Torres, M. E., Riedel, M., Panieri, G., Lepland, A., Hsu, C. ‐W., Wintersteller, P., Wallmann, K., Schmidt, C., Yao, H., and Bohrmann, G. Mon .
"Origin and Transformation of Light Hydrocarbons Ascending at an Active Pockmark on Vestnesa Ridge, Arctic Ocean". United States. https://doi.org/10.1029/2018JB016679.
@article{osti_1582501,
title = {Origin and Transformation of Light Hydrocarbons Ascending at an Active Pockmark on Vestnesa Ridge, Arctic Ocean},
author = {Pape, T. and Bünz, S. and Hong, W. ‐L. and Torres, M. E. and Riedel, M. and Panieri, G. and Lepland, A. and Hsu, C. ‐W. and Wintersteller, P. and Wallmann, K. and Schmidt, C. and Yao, H. and Bohrmann, G.},
abstractNote = {Abstract We report on the geochemistry of hydrocarbons and pore waters down to 62.5 mbsf, collected by drilling with the MARUM‐MeBo70 and by gravity coring at the Lunde pockmark in the Vestnesa Ridge. Our data document the origin and transformations of volatiles feeding gas emissions previously documented in this region. Gas hydrates are present where a fracture network beneath the pockmark focusses migration of thermogenic hydrocarbons characterized by their C 1 /C 2+ and stable isotopic compositions (δ 2 H‐CH 4 , δ 13 C‐CH 4 ). Measured geothermal gradients (~80 °C/km) and known formation temperatures (>70 °C) suggest that those hydrocarbons are formed at depths >800 mbsf. A combined analytical/modeling approach, including concentration and isotopic mass balances, reveals that pockmark sediments experience diffuse migration of thermogenic hydrocarbons. However, at sites without channeled flow this appears to be limited to depths >~50 mbsf. At all sites we document a contribution of microbial methanogenesis to the overall carbon cycle that includes a component of secondary carbonate reduction—that is, reduction of dissolved inorganic carbon generated by anaerobic oxidation of methane in the uppermost methanogenic zone. Anaerobic oxidation of methane and carbonate reduction rates are spatially variable within the pockmark and are highest at high‐flux sites. These reactions are revealed by 13 C depletions of dissolved inorganic carbon at the sulfate‐methane interface at all sites. However, 13 C depletions of CH 4 are only observed at the low methane flux sites because changes in the isotopic composition of the overall methane pool are masked at high‐flux sites. 13 C depletions of total organic carbon suggest that at seeps sites, methane‐derived carbon is incorporated into de novo synthesized biomass.},
doi = {10.1029/2018JB016679},
journal = {Journal of Geophysical Research. Solid Earth},
number = 1,
volume = 125,
place = {United States},
year = {Mon Jan 13 00:00:00 EST 2020},
month = {Mon Jan 13 00:00:00 EST 2020}
}
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