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Clumped isotope signatures of methane-derived authigenic carbonate presenting equilibrium values of their formation temperatures.

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Title: Clumped isotope signatures of methane-derived authigenic carbonate presenting equilibrium values of their formation temperatures.
Authors: Zhang, Naizhong1,2 ty16003@meiji.ac.jp, Lin, Mang2, Snyder, Glen T.1, Kakizaki, Yoshihiro1,3, Yamada, Keita2, Yoshida, Naohiro2,4, Matsumoto, Ryo1
Source: Earth & Planetary Science Letters. Apr2019, Vol. 512, p207-213. 7p.
Subjects: Methane, Carbonate analysis, Temperature effect, Isotope geology, Thermometry
Abstract: Highlights • Authigenic marine carbonates along Japan margins present equilibrium Δ 47 signatures. • Pore water δ 18 O at the time of precipitation is estimated by Δ 47 thermometry. • Carbonates were formed during glacial and/or hydrate destabilization periods. • Disequilibrium Δ 47 is likely related to rapid rates of anaerobic methane oxidation. Abstract The chemical and stable isotopic composition of methane-derived authigenic carbonate (MDAC) can be used to document paleoclimate and biogeochemical information in methane cold seeps, such as temperature records determined through clumped isotope (Δ 47) analyses. Previous investigations of MDACs, however, have noted isotopic disequilibrium values, limiting the application of Δ 47 signatures as a proxy for the formation temperature of carbonates at present and former gas seep sites. Here we measured 49 MDAC samples collected from 5 areas along the Eastern margin of the Japan Sea and the northwest Pacific region of Japan. All samples present equilibrium Δ 47 signatures with respect to seafloor temperatures at the time of precipitation, and the results do not appear to be influenced by the Mg content, mineralogy or mixing effect. The pore water δ 18 O values estimated by the Δ 47 thermometer reveal that most of these MDACs formed during glacial and/or hydrate destabilization periods. While our new data shows equilibrium Δ 47 values, the results do not discount the possibility that disequilibrium observed in previous studies could possibly be associated with extremely rapid rates of anaerobic oxidation of methane. Relevant potential mechanisms are discussed. Further investigations are crucial to clarify the utility of Δ 47 in MDACs as a novel proxy for constraining the modern/ancient methane seep environment. This proxy also offers insights into formation and dissociation processes of gas hydrate, a potential energy resource in the future. [ABSTRACT FROM AUTHOR]
Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Clumped isotope signatures of methane-derived authigenic carbonate presenting equilibrium values of their formation temperatures.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Naizhong%22">Zhang, Naizhong</searchLink><relatesTo>1,2</relatesTo><i> ty16003@meiji.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Lin%2C+Mang%22">Lin, Mang</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Snyder%2C+Glen+T%2E%22">Snyder, Glen T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kakizaki%2C+Yoshihiro%22">Kakizaki, Yoshihiro</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Yamada%2C+Keita%22">Yamada, Keita</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Yoshida%2C+Naohiro%22">Yoshida, Naohiro</searchLink><relatesTo>2,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Matsumoto%2C+Ryo%22">Matsumoto, Ryo</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Earth+%26+Planetary+Science+Letters%22">Earth & Planetary Science Letters</searchLink>. Apr2019, Vol. 512, p207-213. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Methane%22">Methane</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonate+analysis%22">Carbonate analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Isotope+geology%22">Isotope geology</searchLink><br /><searchLink fieldCode="DE" term="%22Thermometry%22">Thermometry</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Highlights • Authigenic marine carbonates along Japan margins present equilibrium Δ 47 signatures. • Pore water δ 18 O at the time of precipitation is estimated by Δ 47 thermometry. • Carbonates were formed during glacial and/or hydrate destabilization periods. • Disequilibrium Δ 47 is likely related to rapid rates of anaerobic methane oxidation. Abstract The chemical and stable isotopic composition of methane-derived authigenic carbonate (MDAC) can be used to document paleoclimate and biogeochemical information in methane cold seeps, such as temperature records determined through clumped isotope (Δ 47) analyses. Previous investigations of MDACs, however, have noted isotopic disequilibrium values, limiting the application of Δ 47 signatures as a proxy for the formation temperature of carbonates at present and former gas seep sites. Here we measured 49 MDAC samples collected from 5 areas along the Eastern margin of the Japan Sea and the northwest Pacific region of Japan. All samples present equilibrium Δ 47 signatures with respect to seafloor temperatures at the time of precipitation, and the results do not appear to be influenced by the Mg content, mineralogy or mixing effect. The pore water δ 18 O values estimated by the Δ 47 thermometer reveal that most of these MDACs formed during glacial and/or hydrate destabilization periods. While our new data shows equilibrium Δ 47 values, the results do not discount the possibility that disequilibrium observed in previous studies could possibly be associated with extremely rapid rates of anaerobic oxidation of methane. Relevant potential mechanisms are discussed. Further investigations are crucial to clarify the utility of Δ 47 in MDACs as a novel proxy for constraining the modern/ancient methane seep environment. This proxy also offers insights into formation and dissociation processes of gas hydrate, a potential energy resource in the future. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.epsl.2019.02.005
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        Text: English
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      – SubjectFull: Methane
        Type: general
      – SubjectFull: Carbonate analysis
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      – SubjectFull: Temperature effect
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      – SubjectFull: Isotope geology
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      – SubjectFull: Thermometry
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              Text: Apr2019
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