High rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplain

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dc.citation.articleNumbere2306343120en_US
dc.citation.issueNumber39en_US
dc.citation.journalTitleProceedings of the National Academy of Sciencesen_US
dc.citation.volumeNumber120en_US
dc.contributor.authorDellinger, Mathieuen_US
dc.contributor.authorHilton, Robert G.en_US
dc.contributor.authorBaronas, J. Jotautasen_US
dc.contributor.authorTorres, Mark A.en_US
dc.contributor.authorBurt, Emily I.en_US
dc.contributor.authorClark, Kasey E.en_US
dc.contributor.authorGaly, Valieren_US
dc.contributor.authorCcahuana Quispe, Adan Julianen_US
dc.contributor.authorWest, A. Joshuaen_US
dc.date.accessioned2024-05-03T15:51:11Zen_US
dc.date.available2024-05-03T15:51:11Zen_US
dc.date.issued2023en_US
dc.description.abstractThe oxidation of organic carbon contained within sedimentary rocks (“petrogenic” carbon, or hereafter OCpetro) emits nearly as much CO2 as is released by volcanism, thereby playing a key role in the long-term global C budget. High erosion rates in mountains have been shown to increase OCpetro oxidation. However, these settings also export unweathered material that may continue to react in downstream floodplains. The relative importance of OCpetro oxidation in mountains versus floodplains remains difficult to assess as disparate methods have been used in the different environments. Here, we investigate the sources and fluxes of rhenium (Re) in the Rio Madre de Dios to quantify OCpetro oxidation from the Andes to the Amazon floodplain using a common approach. Dissolved rhenium concentrations (n = 131) range from 0.01 to 63 pmol L−1 and vary depending on lithology and geomorphic setting. We find that >75% of the dissolved Re derives from OCpetro oxidation and that this proportion increases downstream. We estimate that in the Andes, OCpetro oxidation releases 11.2+4.5/−2.8 tC km−2 y−1 of CO2, which corresponds to ~41% of the total OCpetro denudation (sum of oxidized and solid OCpetro). A Re mass balance across the Rio Madre de Dios shows that 46% of OCpetro oxidation takes place in the Andes, 14% in the foreland-lowlands, and 40% in the Andean-fed floodplains. This doubling of OCpetro oxidation flux downstream of the Andes demonstrates that, when present, floodplains can greatly increase OCpetro oxidation and CO2 release.en_US
dc.identifier.citationDellinger, M., Hilton, R. G., Baronas, J. J., Torres, M. A., Burt, E. I., Clark, K. E., Galy, V., Ccahuana Quispe, A. J., & West, A. J. (2023). High rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplain. Proceedings of the National Academy of Sciences, 120(39), e2306343120. https://doi.org/10.1073/pnas.2306343120en_US
dc.identifier.digitalhigh-rates-of-rock-organic-carbon-oxidationen_US
dc.identifier.doihttps://doi.org/10.1073/pnas.2306343120en_US
dc.identifier.urihttps://hdl.handle.net/1911/115554en_US
dc.language.isoengen_US
dc.publisherNational Academy of Sciencesen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleHigh rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplainen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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