Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures
Abstract
Here, methane cold seep systems typically exhibit extensive buildups of authigenic carbonate minerals, resulting from local increases in alkalinity driven by methane oxidation. Here, we demonstrate that modern seep authigenic carbonates exhibit anomalously low clumped isotope values (Δ47), as much as ~0.2‰ lower than expected values. In modern seeps, this range of disequilibrium translates into apparent temperatures that are always warmer than ambient temperatures, by up to 50 °C. We examine various mechanisms that may induce disequilibrium behaviour in modern seep carbonates, and suggest that the observed values result from several factors including kinetic isotopic effects during methane oxidation, mixing of inorganic carbon pools, pH effects and rapid precipitation. Ancient seep carbonates studied here also exhibit potential disequilibrium signals. Ultimately, these findings indicate the predominance of disequilibrium clumped isotope behaviour in modern cold seep carbonates that must be considered when characterizing environmental conditions in both modern and ancient cold seep settings.
- Authors:
-
- California State Univ., Fullerton, CA (United States); Univ. of California, Los Angeles, CA (United States)
- Northern Arizona Univ., Flagstaff, AZ (United States)
- Univ. of California, Los Angeles, CA (United States); Univ. de Brest, Plouzane (France)
- Univ. of California, Los Angeles, CA (United States)
- Univ. of Bergen, Bergen (Norway)
- Oregon State Univ., Corvallis, OR (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Univ. of California, Riverside, CA (United States)
- Univ. of Washington, Seattle, WA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1395567
- Grant/Contract Number:
- FG02-13ER16402; SC0010288
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES
Citation Formats
Loyd, S. J., Sample, J., Tripati, R. E., Defliese, W. F., Brooks, K., Hovland, M., Torres, M., Marlow, J., Hancock, L. G., Martin, R., Lyons, T., and Tripati, A. E. Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures. United States: N. p., 2016.
Web. doi:10.1038/ncomms12274.
Loyd, S. J., Sample, J., Tripati, R. E., Defliese, W. F., Brooks, K., Hovland, M., Torres, M., Marlow, J., Hancock, L. G., Martin, R., Lyons, T., & Tripati, A. E. Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures. United States. https://doi.org/10.1038/ncomms12274
Loyd, S. J., Sample, J., Tripati, R. E., Defliese, W. F., Brooks, K., Hovland, M., Torres, M., Marlow, J., Hancock, L. G., Martin, R., Lyons, T., and Tripati, A. E. Fri .
"Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures". United States. https://doi.org/10.1038/ncomms12274. https://www.osti.gov/servlets/purl/1395567.
@article{osti_1395567,
title = {Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures},
author = {Loyd, S. J. and Sample, J. and Tripati, R. E. and Defliese, W. F. and Brooks, K. and Hovland, M. and Torres, M. and Marlow, J. and Hancock, L. G. and Martin, R. and Lyons, T. and Tripati, A. E.},
abstractNote = {Here, methane cold seep systems typically exhibit extensive buildups of authigenic carbonate minerals, resulting from local increases in alkalinity driven by methane oxidation. Here, we demonstrate that modern seep authigenic carbonates exhibit anomalously low clumped isotope values (Δ47), as much as ~0.2‰ lower than expected values. In modern seeps, this range of disequilibrium translates into apparent temperatures that are always warmer than ambient temperatures, by up to 50 °C. We examine various mechanisms that may induce disequilibrium behaviour in modern seep carbonates, and suggest that the observed values result from several factors including kinetic isotopic effects during methane oxidation, mixing of inorganic carbon pools, pH effects and rapid precipitation. Ancient seep carbonates studied here also exhibit potential disequilibrium signals. Ultimately, these findings indicate the predominance of disequilibrium clumped isotope behaviour in modern cold seep carbonates that must be considered when characterizing environmental conditions in both modern and ancient cold seep settings.},
doi = {10.1038/ncomms12274},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Fri Jul 22 00:00:00 EDT 2016},
month = {Fri Jul 22 00:00:00 EDT 2016}
}
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