Rhenium Isotopes Record Oxidative Weathering Intensity in Sedimentary Rocks

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dc.citation.articleNumbere2024GC011795en_US
dc.citation.issueNumber10en_US
dc.citation.journalTitleGeochemistry, Geophysics, Geosystemsen_US
dc.citation.volumeNumber25en_US
dc.contributor.authorDickson, A. J.en_US
dc.contributor.authorHilton, R. G.en_US
dc.contributor.authorPrytulak, J.en_US
dc.contributor.authorMinisini, D.en_US
dc.contributor.authorEldrett, J. S.en_US
dc.contributor.authorDellinger, M.en_US
dc.contributor.authorStow, M.en_US
dc.contributor.authorWang, W.en_US
dc.date.accessioned2024-11-20T15:52:02Zen_US
dc.date.available2024-11-20T15:52:02Zen_US
dc.date.issued2024en_US
dc.description.abstractOxidative weathering of organic carbon in sedimentary rocks is a major source of CO2 to the atmosphere over geological timescales, but the size of this emission pathway in Earth's past has not been directly quantified due to a lack of available proxy approaches. We have measured the rhenium isotope composition of organic-rich rocks sampled from unweathered drill cores and weathered outcrops in south Texas, whose stratigraphic successions can be tightly correlated. Oxidative weathering of more than 90% of the organic carbon and ∼85% of the rhenium is accompanied by a shift to lower rhenium isotope compositions in the weathered outcrops. The calculated isotope composition of rhenium weathered from the initial bedrock for individual samples varies systematically by ∼0.7‰ with different fractions of rhenium loss. This variation can be empirically modeled with isotope fractionation factors of α = 1.0002–1.0008. Our results indicate that the isotope composition of rhenium delivered to the oceans can be altered by weathering intensity of rock organic matter and that the rhenium isotope composition of seawater is sensitive to past oxidative weathering and associated CO2 emissions.en_US
dc.identifier.citationDickson, A. J., Hilton, R. G., Prytulak, J., Minisini, D., Eldrett, J. S., Dellinger, M., Stow, M., & Wang, W. (2024). Rhenium Isotopes Record Oxidative Weathering Intensity in Sedimentary Rocks. Geochemistry, Geophysics, Geosystems, 25(10), e2024GC011795. https://doi.org/10.1029/2024GC011795en_US
dc.identifier.digitalRhenium-Isotopes-Record-Oxidative-Weathering-Intensity-in-Sedimentary-Rocksen_US
dc.identifier.doihttps://doi.org/10.1029/2024GC011795en_US
dc.identifier.urihttps://hdl.handle.net/1911/118050en_US
dc.language.isoengen_US
dc.publisherWileyen_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.titleRhenium Isotopes Record Oxidative Weathering Intensity in Sedimentary Rocksen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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