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dc.contributor.authorZhao, Binen_UK
dc.contributor.authorYao, Pengen_UK
dc.contributor.authorBianchi, Thomas Sen_UK
dc.contributor.authorWang, Xuchenen_UK
dc.contributor.authorShields, Michael Ren_UK
dc.contributor.authorSchroeder, Christianen_UK
dc.contributor.authorYu, Zhigangen_UK
dc.description.abstractReactive iron (FeR) plays an important role in the preservation of organic carbon (OC) in coastal sediments, yet changes in the OC bound to FeR (OC-FeR), during transport and deposition, remain poorly understood. The main goal of this work is to investigate the variation of the age and composition of OC-FeR from estuarine suspended particulate matter (SPM) to coastal sediments, to further understand the role of FeR in the preservation of terrestrial OC exported from large rivers into marginal seas. We examined OC and its carbon isotopic composition (Δ14Cbulk, δ13Cbulk), specific surface area (SSA), grain size composition, lignin phenols, FeR, Mössbauer spectroscopy, and isotopic signatures of OC-FeR (Δ14COC-FeR, δ13COC-FeR) in SPM and surface sediments of the Changjiang Estuary. Particulate OC (POC) and FeR concentrations in SPM are significantly higher than in surface sediments, with no significant differences between surface- and bottom-water SPM. This indicates that loss of OC and FeR largely occurs at the sediment-water interface due in part, to rapid Fe cycling. The percentage of OC-FeR (fOC-FeR) in SPM (6.6 ± 1.9%) is similar to that in mobile-mud sediment (8.8 ± 1.8%). There are no significant differences in OC-FeR content (p>0.05) from SPM to mobile-mud sediments, but non-OC-FeR largely decreases, suggesting that terrestrial OC-FeR has greater stability compared to terrestrial non-OC-FeR. Both δ13COC-FeR and Δ14COC-FeR are lower than bulk OC, indicating that FeR is mainly associated with pre-aged soil OC of terrestrial plant origin, especially in estuarine SPM and mobile-mud sediments. Taken together, binding with FeR is a potential long-term protection mechanism for terrestrial OC. Both Δ14Cbulk and Δ14COC-FeR decrease with an increase in the ratio of hematite to (super)paramagnetic Fe3+, indicating that high-crystallinity iron oxide is largely associated with pre-aged terrestrial OC, and there is a potential joint maturation mechanism between FeR and its associated OC. Based on literature comparisons of soils, estuarine SPM, and marine sediments, OC-FeR associations are controlled mainly by sedimentary regimes, FeR compositions, and OC sources. This work supports the notion that FeR plays an important role in the stabilization and transport of river-derived terrestrial OC.en_UK
dc.relationZhao B, Yao P, Bianchi TS, Wang X, Shields MR, Schroeder C & Yu Z (2023) Preferential preservation of pre-aged terrestrial organic carbon by reactive iron in estuarine particles and coastal sediments of a large river-dominated estuary. <i>Geochimica et Cosmochimica Acta</i>, 345, pp. 34-49.
dc.rightsThis item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Accepted refereed manuscript of: Zhao B, Yao P, Bianchi TS, Wang X, Shields MR, Schroeder C & Yu Z (2023) Preferential preservation of pre-aged terrestrial organic carbon by reactive iron in estuarine particles and coastal sediments of a large river-dominated estuary. Geochimica et Cosmochimica Acta, 345, pp. 34-49. DOI: © 2023, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.subjectChangjiang Estuaryen_UK
dc.subjectestuarine particlesen_UK
dc.subjectmobile mudsen_UK
dc.subjectreactive ironen_UK
dc.subjectreactive ironassociated organic carbonen_UK
dc.titlePreferential preservation of pre-aged terrestrial organic carbon by reactive iron in estuarine particles and coastal sediments of a large river-dominated estuaryen_UK
dc.typeJournal Articleen_UK
dc.rights.embargoreason[Zhao et al-GCA-manuscript-2023-1-22.pdf] Publisher requires embargo of 12 months after publication.en_UK
dc.citation.jtitleGeochimica et Cosmochimica Actaen_UK
dc.type.statusNA - Not Applicable (or Unknown)en_UK
dc.type.statusAM - Accepted Manuscripten_UK
dc.contributor.affiliationOcean University of Chinaen_UK
dc.contributor.affiliationOcean University of Chinaen_UK
dc.contributor.affiliationUniversity of Floridaen_UK
dc.contributor.affiliationOcean University of Chinaen_UK
dc.contributor.affiliationTexas A&M Universityen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationOcean University of Chinaen_UK
rioxxterms.apcnot requireden_UK
rioxxterms.typeJournal Article/Reviewen_UK
local.rioxx.authorZhao, Bin|en_UK
local.rioxx.authorYao, Peng|en_UK
local.rioxx.authorBianchi, Thomas S|en_UK
local.rioxx.authorWang, Xuchen|en_UK
local.rioxx.authorShields, Michael R|en_UK
local.rioxx.authorSchroeder, Christian|0000-0002-7935-6039en_UK
local.rioxx.authorYu, Zhigang|en_UK
local.rioxx.projectInternal Project|University of Stirling|
local.rioxx.filenameZhao et al-GCA-manuscript-2023-1-22.pdfen_UK
Appears in Collections:Biological and Environmental Sciences Journal Articles

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