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

Abstract：

: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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Loyd SJ,Sample J,Tripati RE,Defliese WF,Brooks K,Hovland M,Torres M,Marlow J,Hancock LG,Martin R,Lyons T,Tripati AE

doi

10.1038/ncomms12274

subject

Has Abstract

pub_date

2016-07-22 00:00:00

pages

12274

issn

2041-1723

pii

ncomms12274

journal_volume

7

pub_type

杂志文章

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