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

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. (2016) Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures. Nature Communications, 7 . Art. No. 12274. ISSN 2041-1723. PMCID PMC4961868.

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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 (Δ_(47)), 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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URLURL TypeDescription CentralArticle
Torres, M.0000-0002-9599-2748
Additional Information:© 2016 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit Received 24 March 2016; Accepted 17 June 2016; Published 22 July 2016. Preliminary discussion and access to some cold seep carbonates provided by Victoria Orphan. Funding for the study was provided to S.L. by the Agouron Geobiology Postdoctoral Fellowship. A.K.T. acknowledges support from the Department of Energy through BES grant DE-FG02-13ER16402. Author contributions: S.J.L and A.E.T conceived study; S.J.L, R.E.T, K.B., L.G.H. and A.E.T performed analyses; J.S., M.H., M.T., J.M. and T.L. provided samples. All authors contributed to writing the manuscript. Data availability: All data pertinent to this manuscript and its reported findings can be found in the manuscript itself or the associated Supplementary Information file. The authors declare no competing financial interests.
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Agouron InstituteUNSPECIFIED
Department of Energy (DOE)DE-FG02-13ER16402
PubMed Central ID:PMC4961868
Record Number:CaltechAUTHORS:20160801-082210898
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Official Citation:Loyd, S. J. et al. Methane seep carbonates yield clumped isotope signatures out of equilibrium with formation temperatures. Nat. Commun. 7:12274 doi: 10.1038/ncomms12274 (2016).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69340
Deposited By: Tony Diaz
Deposited On:01 Aug 2016 18:40
Last Modified:03 Oct 2019 10:21

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