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Terrigenous organic matter in sediments from the Fly River delta-clinoform system (Papua New Guinea)

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dc.creator Goni, Miguel A.
dc.creator Monacci, Natalie
dc.creator Gisewhite, Rachel
dc.creator Crockett, John
dc.creator Nittrouer, Charles
dc.creator Ogston, Andrea
dc.creator Alin, Simone R.
dc.creator Aalto, Rolf
dc.date.accessioned 2010-04-06T13:18:35Z
dc.date.available 2010-04-06T13:18:35Z
dc.date.issued 2008-02-02
dc.identifier.citation Goñi, M. A., N. Monacci, R. Gisewhite, J. Crockett, C. Nittrouer, A. Ogston, S. R. Alin, and R. Aalto (2008), Terrigenous organic matter in sediments from the Fly River delta-clinoform system (Papua New Guinea), J. Geophys. Res., 113, F01S10, doi:10.1029/2006JF000653. en
dc.identifier.issn 0148-0227
dc.identifier.uri http://hdl.handle.net/1957/15246
dc.description.abstract Although an inordinate fraction of the global sediment flux to the ocean occurs in tropical mountainous river margins, little is known regarding the sources and fate of organic matter in these systems. To address these knowledge gaps, the distribution and composition of organic matter in sediments from the Fly River delta-clinoform were examined in the context of the source-to-sink study of the Papuan Continuum. The significant contrasts in the texture of seabed sediments measured across the study area coincided with stark contrasts in concentration and composition of the sedimentary organic matter. Coarser sediments displayed significantly lower organic carbon and nitrogen contents, more enriched stable carbon and nitrogen compositions, lower lignin product yields, and distinctly different lignin and nonlignin product compositions than their fine-textured counterparts. Compositional differences were also measured between high- and low-density fractions of selected sediment samples. Subsurface sediments showed marked compositional variations that were predominantly associated with changes in the texture of the deposits. Most sediments were characterized by moderate carbon loadings (0.5–1.0 mg C m–2), although several samples from the outer topset region, an area of sediment bypass, were characterized by lower carbon loadings indicative of enhanced carbon losses. Overall, the organic matter in both surface and subsurface sediments appeared to have predominantly a terrigenous origin, with no evidence for dilution and/or replacement by marine carbon. The measured compositions were consistent with contributions from modern vascular plant detritus, aged soil organic matter, and very old or fossil organic matter devoid of recognizable biochemicals. en
dc.description.sponsorship This research was supported by funds from the National Science Foundation through the Chemical Oceanography (OCE-0220600 grant to M. Goñi) and MARGINS Programs (OCE-0203351 and OCE-0504616 to C. Nittrouer and A. Ogston). Radiocarbon analyses were performed through the auspices of the U.S. Department of Energy by the University of California/Lawrence Livermore National Laboratory under contract W-7405-Eng-48. Funding for the radiocarbon analyses was provided to T. Guilderson by UC/LLNL 04-ERD-060. en
dc.language.iso en_US en
dc.publisher American Geophysical Union en
dc.relation.ispartofseries Journal of geophysical research en
dc.relation.ispartofseries Vol. 113 (2008) en
dc.title Terrigenous organic matter in sediments from the Fly River delta-clinoform system (Papua New Guinea) en
dc.type Article en
dc.identifier.doi 10.1029/2006JF000653

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