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Validating the rhenium proxy for rock organic carbon oxidation using weathering profiles.

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Title: Validating the rhenium proxy for rock organic carbon oxidation using weathering profiles.
Authors: Grant, Katherine E.1,2 (AUTHOR) grant39@llnl.gov, Dellinger, Mathieu2,3 (AUTHOR), Dickson, Alexander J.4 (AUTHOR), Ogric, Mateja2 (AUTHOR), Horan, Kate2 (AUTHOR), Petsch, Steven5 (AUTHOR), Hilton, Robert G.1,6 (AUTHOR) robert.hilton@earth.ox.ac.uk
Source: Chemical Geology. Jan2025, Vol. 671, pN.PAG-N.PAG. 1p.
Subjects: Atmospheric carbon dioxide, Carbon dioxide sinks, Surface of the earth, Weathering, Geochemical cycles, Chemical weathering
Abstract: Chemical weathering over geological timescales acts as a source or sink of atmospheric carbon dioxide (CO 2), while influencing long-term redox cycling and atmospheric oxygen (O 2) at Earth's surface. There is a growing recognition that the oxidative weathering of rock organic carbon (OC petro) can release more CO 2 than is locally drawn down by silicate weathering, and may vary due to changes in erosion and climate. The element rhenium (Re) has emerged as a proxy to track the oxidative weathering of OC petro , yet uncertainties in its application remain namely that we lack a systematic assessment of the comparative mobility of Re and OC petro during sedimentary rock weathering. Here we measure Re and OC petro loss across gradients in rock weathering at 9 global sites, spanning a range of initial OC petro values from ∼0.2 % to >10 %. We use titanium to account for volume changes during weathering and assess Re and OC petro loss alongside major elements that reflect silicate (Na, Mg), carbonate (Ca, Mg) and sulfide (S) weathering. Across the dataset, Re loss is correlated with OC petro loss but not with loss of any other major element. Across the weathering profiles, the average molar ratio of OC petro to Re loss was 0.84 ± 0.15, with 8 out of 9 sites having a ratio >0.74. At one site (Marcellus Shale), the average ratio was lower at 0.58 ± 0.11. The excess loss of Re matches expectations that, typically, between ∼0 and 20 % of the Re liberated by sedimentary rock weathering derives from silicate or sulfide phases, while some OC petro may be physically or chemically protected from weathering. Overall, our measurements provide validation for the Re proxy of OC petro oxidation and allow future work to further improve our knowledge of regional and global-scale rates of this important source of CO 2 in the geochemical carbon cycle. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Geology 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: <searchLink fieldCode="AR" term="%22Grant%2C+Katherine+E%2E%22">Grant, Katherine E.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> grant39@llnl.gov</i><br /><searchLink fieldCode="AR" term="%22Dellinger%2C+Mathieu%22">Dellinger, Mathieu</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dickson%2C+Alexander+J%2E%22">Dickson, Alexander J.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ogric%2C+Mateja%22">Ogric, Mateja</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Horan%2C+Kate%22">Horan, Kate</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Petsch%2C+Steven%22">Petsch, Steven</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hilton%2C+Robert+G%2E%22">Hilton, Robert G.</searchLink><relatesTo>1,6</relatesTo> (AUTHOR)<i> robert.hilton@earth.ox.ac.uk</i>
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  Data: <searchLink fieldCode="DE" term="%22Atmospheric+carbon+dioxide%22">Atmospheric carbon dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+dioxide+sinks%22">Carbon dioxide sinks</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+of+the+earth%22">Surface of the earth</searchLink><br /><searchLink fieldCode="DE" term="%22Weathering%22">Weathering</searchLink><br /><searchLink fieldCode="DE" term="%22Geochemical+cycles%22">Geochemical cycles</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+weathering%22">Chemical weathering</searchLink>
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  Data: Chemical weathering over geological timescales acts as a source or sink of atmospheric carbon dioxide (CO 2), while influencing long-term redox cycling and atmospheric oxygen (O 2) at Earth's surface. There is a growing recognition that the oxidative weathering of rock organic carbon (OC petro) can release more CO 2 than is locally drawn down by silicate weathering, and may vary due to changes in erosion and climate. The element rhenium (Re) has emerged as a proxy to track the oxidative weathering of OC petro , yet uncertainties in its application remain namely that we lack a systematic assessment of the comparative mobility of Re and OC petro during sedimentary rock weathering. Here we measure Re and OC petro loss across gradients in rock weathering at 9 global sites, spanning a range of initial OC petro values from ∼0.2 % to >10 %. We use titanium to account for volume changes during weathering and assess Re and OC petro loss alongside major elements that reflect silicate (Na, Mg), carbonate (Ca, Mg) and sulfide (S) weathering. Across the dataset, Re loss is correlated with OC petro loss but not with loss of any other major element. Across the weathering profiles, the average molar ratio of OC petro to Re loss was 0.84 ± 0.15, with 8 out of 9 sites having a ratio >0.74. At one site (Marcellus Shale), the average ratio was lower at 0.58 ± 0.11. The excess loss of Re matches expectations that, typically, between ∼0 and 20 % of the Re liberated by sedimentary rock weathering derives from silicate or sulfide phases, while some OC petro may be physically or chemically protected from weathering. Overall, our measurements provide validation for the Re proxy of OC petro oxidation and allow future work to further improve our knowledge of regional and global-scale rates of this important source of CO 2 in the geochemical carbon cycle. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Chemical Geology 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.chemgeo.2024.122464
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Atmospheric carbon dioxide
        Type: general
      – SubjectFull: Carbon dioxide sinks
        Type: general
      – SubjectFull: Surface of the earth
        Type: general
      – SubjectFull: Weathering
        Type: general
      – SubjectFull: Geochemical cycles
        Type: general
      – SubjectFull: Chemical weathering
        Type: general
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      – TitleFull: Validating the rhenium proxy for rock organic carbon oxidation using weathering profiles.
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            – D: 05
              M: 01
              Text: Jan2025
              Type: published
              Y: 2025
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              Value: 671
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