Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures

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.

doi:10.1038/ncomms12274

Title: Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures

Journal Article · Fri Jul 22 00:00:00 EDT 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms12274· OSTI ID:1395567

Loyd, S. J. ^[1]; Sample, J. ^[2]; Tripati, R. E. ^[3]; Defliese, W. F. ^[4]; Brooks, K. ^[4]; Hovland, M. ^[5]; Torres, M. ^[6]; Marlow, J. ^[7]; Hancock, L. G. ^[8]; Martin, R. ^[9]; Lyons, T. ^[8]; Tripati, A. E. ^[3]

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)

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.

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Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-13ER16402; SC0010288

OSTI ID:: 1395567

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 54 works

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