An evaluation of 14C age relationships between co‐occurring foraminifera, alkenones, and total organic carbon in continental margin sediments
Identifieur interne : 000968 ( Main/Corpus ); précédent : 000967; suivant : 000969An evaluation of 14C age relationships between co‐occurring foraminifera, alkenones, and total organic carbon in continental margin sediments
Auteurs : Gesine Mollenhauer ; Markus Kienast ; Frank Lamy ; Helge Meggers ; Ralph R. Schneider ; John M. Hayes ; Timothy I. EglintonSource :
- Paleoceanography [ 0883-8305 ] ; 2005-03.
Abstract
Radiocarbon age relationships between co‐occurring planktic foraminifera, alkenones, and total organic carbon in sediments from the continental margins of southern Chile, northwest Africa, and the South China Sea were compared with published results from the Namibian margin. Age relationships between the sediment components are site‐specific and relatively constant over time. Similar to the Namibian slope, where alkenones have been reported to be 1000–4500 years older than co‐occurring foraminifera, alkenones were significantly (∼1000 years) older than co‐occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2σ error or better) in the NW African and South China Sea sediments. Total organic matter and alkenone ages were similar off Namibia (age difference TOC alkenones: 200–700 years), Chile (100–450 years), and NW Africa (360–770 years), suggesting minor contributions of preaged terrigenous material. In the South China Sea, total organic carbon is significantly (2000–3000 years) older owing to greater inputs of preaged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as seafloor morphology, shelf width, and sediment composition, may control the age of co‐occurring sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. Age offsets are correlated with organic richness, suggesting that formation of organic aggregates is a key process.
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DOI: 10.1029/2004PA001103
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Schneider</name><affiliation><mods:affiliation>Institut für Geowissenschaften, Christian‐Albrechts‐Universität zu Kiel, Kiel, Germany</mods:affiliation></affiliation></author><author><name sortKey="Hayes, John M" sort="Hayes, John M" uniqKey="Hayes J" first="John M." last="Hayes">John M. Hayes</name><affiliation><mods:affiliation>National Ocean Sciences Accelerator Mass Spectrometry Facility, McLean Laboratory, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</mods:affiliation></affiliation></author><author><name sortKey="Eglinton, Timothy I" sort="Eglinton, Timothy I" uniqKey="Eglinton T" first="Timothy I." last="Eglinton">Timothy I. Eglinton</name><affiliation><mods:affiliation>Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Paleoceanography</title><title level="j" type="abbrev">Paleoceanography</title><idno type="ISSN">0883-8305</idno><idno type="eISSN">1944-9186</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2005-03">2005-03</date><biblScope unit="volume">20</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="n/a">n/a</biblScope><biblScope unit="page" to="n/a">n/a</biblScope></imprint><idno type="ISSN">0883-8305</idno></series><idno type="istex">4B69B731AF9D28789B7C23A37684BCC3A8C1D44A</idno><idno type="DOI">10.1029/2004PA001103</idno><idno type="ArticleID">2004PA001103</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0883-8305</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Radiocarbon age relationships between co‐occurring planktic foraminifera, alkenones, and total organic carbon in sediments from the continental margins of southern Chile, northwest Africa, and the South China Sea were compared with published results from the Namibian margin. Age relationships between the sediment components are site‐specific and relatively constant over time. Similar to the Namibian slope, where alkenones have been reported to be 1000–4500 years older than co‐occurring foraminifera, alkenones were significantly (∼1000 years) older than co‐occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2σ error or better) in the NW African and South China Sea sediments. Total organic matter and alkenone ages were similar off Namibia (age difference TOC alkenones: 200–700 years), Chile (100–450 years), and NW Africa (360–770 years), suggesting minor contributions of preaged terrigenous material. In the South China Sea, total organic carbon is significantly (2000–3000 years) older owing to greater inputs of preaged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as seafloor morphology, shelf width, and sediment composition, may control the age of co‐occurring sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. Age offsets are correlated with organic richness, suggesting that formation of organic aggregates is a key process.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Gesine Mollenhauer</name><affiliations><json:string>E-mail: gmollenhauer@whoi.edu</json:string><json:string>Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</json:string></affiliations></json:item><json:item><name>Markus Kienast</name><affiliations><json:string>Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA</json:string><json:string>Now at Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada.</json:string></affiliations></json:item><json:item><name>Frank Lamy</name><affiliations><json:string>GFZ‐Potsdam, Potsdam, Germany</json:string></affiliations></json:item><json:item><name>Helge Meggers</name><affiliations><json:string>Fachbereich Geowissenschaften, Universität Bremen, Bremen, Germany</json:string></affiliations></json:item><json:item><name>Ralph R. Schneider</name><affiliations><json:string>Institut für Geowissenschaften, Christian‐Albrechts‐Universität zu Kiel, Kiel, Germany</json:string></affiliations></json:item><json:item><name>John M. Hayes</name><affiliations><json:string>National Ocean Sciences Accelerator Mass Spectrometry Facility, McLean Laboratory, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</json:string></affiliations></json:item><json:item><name>Timothy I. 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Similar to the Namibian slope, where alkenones have been reported to be 1000–4500 years older than co‐occurring foraminifera, alkenones were significantly (∼1000 years) older than co‐occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2σ error or better) in the NW African and South China Sea sediments. Total organic matter and alkenone ages were similar off Namibia (age difference TOC alkenones: 200–700 years), Chile (100–450 years), and NW Africa (360–770 years), suggesting minor contributions of preaged terrigenous material. In the South China Sea, total organic carbon is significantly (2000–3000 years) older owing to greater inputs of preaged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as seafloor morphology, shelf width, and sediment composition, may control the age of co‐occurring sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. 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Kiel, Germany</affiliation></author><author><persName><forename type="first">John M.</forename><surname>Hayes</surname></persName><affiliation>National Ocean Sciences Accelerator Mass Spectrometry Facility, McLean Laboratory, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</affiliation></author><author><persName><forename type="first">Timothy I.</forename><surname>Eglinton</surname></persName><affiliation>Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</affiliation></author></analytic><monogr><title level="j">Paleoceanography</title><title level="j" type="abbrev">Paleoceanography</title><idno type="pISSN">0883-8305</idno><idno type="eISSN">1944-9186</idno><idno type="DOI">10.1002/(ISSN)1944-9186</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2005-03"></date><biblScope unit="volume">20</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" 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Age relationships between the sediment components are site‐specific and relatively constant over time. Similar to the Namibian slope, where alkenones have been reported to be 1000–4500 years older than co‐occurring foraminifera, alkenones were significantly (∼1000 years) older than co‐occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2σ error or better) in the NW African and South China Sea sediments. Total organic matter and alkenone ages were similar off Namibia (age difference TOC alkenones: 200–700 years), Chile (100–450 years), and NW Africa (360–770 years), suggesting minor contributions of preaged terrigenous material. In the South China Sea, total organic carbon is significantly (2000–3000 years) older owing to greater inputs of preaged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as seafloor morphology, shelf width, and sediment composition, may control the age of co‐occurring sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. Age offsets are correlated with organic richness, suggesting that formation of organic aggregates is a key process.</p></abstract><textClass><keywords scheme="keyword"><list><head>Keywords</head><item><term>compound‐specific radiocarbon dating</term></item><item><term>alkenones</term></item><item><term>high accumulation rate sediments</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>Index Terms</head><item><term>BIOGEOSCIENCES</term></item><item><term>Nutrients and nutrient cycling</term></item><item><term>Carbon cycling</term></item><item><term>GEOCHEMISTRY</term></item><item><term>Radiogenic isotope geochemistry</term></item><item><term>Marine geochemistry</term></item><item><term>HYDROLOGY</term></item><item><term>Sediment transport</term></item><item><term>OCEANOGRAPHY: PHYSICAL</term></item><item><term>Sediment transport</term></item><item><term>OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL</term></item><item><term>Marine organic chemistry</term></item><item><term>Carbon cycling</term></item><item><term>PALEOCEANOGRAPHY</term></item><item><term>Sea surface temperature</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2004-10-22">Received</change><change when="2005-01-25">Registration</change><change when="2005-03">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/4B69B731AF9D28789B7C23A37684BCC3A8C1D44A/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component type="serialArticle" version="2.0" xml:lang="en" xml:id="palo1210"><header><publicationMeta level="product"><doi>10.1002/(ISSN)1944-9186</doi><issn type="print">0883-8305</issn><issn type="electronic">1944-9186</issn><idGroup><id type="product" value="PALO"></id><id type="coden" value="POCGEP"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="PALEOCEANOGRAPHY">Paleoceanography</title><title type="short">Paleoceanography</title></titleGroup></publicationMeta><publicationMeta level="part" position="10"><doi>10.1002/palo.v20.1</doi><numberingGroup><numbering type="journalVolume" number="20">20</numbering><numbering type="journalIssue">1</numbering></numberingGroup><coverDate startDate="2005-03">March 2005</coverDate></publicationMeta><publicationMeta level="unit" position="40" type="article" status="forIssue"><doi>10.1029/2004PA001103</doi><idGroup><id type="editorialOffice" value="2004PA001103"></id><id type="society" value="PA1016"></id><id type="unit" value="PALO1210"></id></idGroup><countGroup><count type="pageTotal" number="12"></count></countGroup><copyright ownership="thirdParty">Copyright 2005 by the American Geophysical Union.</copyright><eventGroup><event type="manuscriptReceived" date="2004-10-22"></event><event type="manuscriptRevised" date="2004-12-23"></event><event type="manuscriptAccepted" date="2005-01-25"></event><event type="firstOnline" date="2005-03-15"></event><event type="publishedOnlineFinalForm" date="2005-03-15"></event><event type="xmlConverted" agent="SPi Global Converter:AGUv3.43_TO_WileyML3Gv1.0.3 version:1.3; 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R.</givenNames> <familyName>Schneider</familyName></author>, <author><givenNames>J. M.</givenNames> <familyName>Hayes</familyName></author>, and <author><givenNames>T. I.</givenNames> <familyName>Eglinton</familyName></author> (<pubYear year="2005">2005</pubYear>), <articleTitle>An evaluation of <sup>14</sup>C age relationships between co‐occurring foraminifera, alkenones, and total organic carbon in continental margin sediments</articleTitle>, <journalTitle>Paleoceanography</journalTitle>, <vol>20</vol>, PA1016, doi:<accessionId ref="info:doi/10.1029/2004PA001103">10.1029/2004PA001103</accessionId>.</citation></selfCitationGroup><linkGroup><link type="toTypesetVersion" href="file:PALO.PALO1210.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="4"></count><count type="tableTotal" number="2"></count></countGroup><titleGroup><title type="main">An evaluation of <sup>14</sup>C age relationships between co‐occurring foraminifera, alkenones, and total organic carbon in continental margin sediments</title><title type="short"><sup>14</sup>C AGES OF FORAMS, ALKENONES, AND TOC</title><title type="shortAuthors">Mollenhauer <i>et al</i>.</title></titleGroup><creators><creator creatorRole="author" xml:id="palo1210-cr-0001" affiliationRef="#palo1210-aff-0001"><personName><givenNames>Gesine</givenNames> <familyName>Mollenhauer</familyName></personName><contactDetails><email normalForm="gmollenhauer@whoi.edu">gmollenhauer@whoi.edu</email></contactDetails></creator><creator creatorRole="author" xml:id="palo1210-cr-0002" affiliationRef="#palo1210-aff-0001 #palo1210-aff-0006"><personName><givenNames>Markus</givenNames> <familyName>Kienast</familyName></personName></creator><creator creatorRole="author" xml:id="palo1210-cr-0003" affiliationRef="#palo1210-aff-0002"><personName><givenNames>Frank</givenNames> <familyName>Lamy</familyName></personName></creator><creator creatorRole="author" xml:id="palo1210-cr-0004" affiliationRef="#palo1210-aff-0003"><personName><givenNames>Helge</givenNames> <familyName>Meggers</familyName></personName></creator><creator creatorRole="author" xml:id="palo1210-cr-0005" affiliationRef="#palo1210-aff-0004"><personName><givenNames>Ralph R.</givenNames> <familyName>Schneider</familyName></personName></creator><creator creatorRole="author" xml:id="palo1210-cr-0006" affiliationRef="#palo1210-aff-0005"><personName><givenNames>John M.</givenNames> <familyName>Hayes</familyName></personName></creator><creator creatorRole="author" xml:id="palo1210-cr-0007" affiliationRef="#palo1210-aff-0001"><personName><givenNames>Timothy I.</givenNames> <familyName>Eglinton</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="US" type="organization" xml:id="palo1210-aff-0001"><orgDiv>Marine Chemistry and Geochemistry Department</orgDiv><orgName>Woods Hole Oceanographic Institution</orgName><address><city>Woods Hole</city><countryPart>Massachusetts</countryPart><country>USA</country></address></affiliation><affiliation countryCode="DE" type="organization" xml:id="palo1210-aff-0002"><orgName>GFZ‐Potsdam</orgName><address><city>Potsdam</city><country>Germany</country></address></affiliation><affiliation countryCode="DE" type="organization" xml:id="palo1210-aff-0003"><orgDiv>Fachbereich Geowissenschaften</orgDiv><orgName>Universität Bremen</orgName><address><city>Bremen</city><country>Germany</country></address></affiliation><affiliation countryCode="DE" type="organization" xml:id="palo1210-aff-0004"><orgDiv>Institut für Geowissenschaften</orgDiv><orgName>Christian‐Albrechts‐Universität zu Kiel</orgName><address><city>Kiel</city><country>Germany</country></address></affiliation><affiliation countryCode="US" type="organization" xml:id="palo1210-aff-0005"><orgDiv>National Ocean Sciences Accelerator Mass Spectrometry Facility, McLean Laboratory</orgDiv><orgName>Woods Hole Oceanographic Institution</orgName><address><city>Woods Hole</city><countryPart>Massachusetts</countryPart><country>USA</country></address></affiliation><affiliation type="organization" xml:id="palo1210-aff-0006"><unparsedAffiliation>Now at Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada.</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="palo1210-kwd-0001">compound‐specific radiocarbon dating</keyword><keyword xml:id="palo1210-kwd-0002">alkenones</keyword><keyword xml:id="palo1210-kwd-0003">high accumulation rate sediments</keyword></keywordGroup><supportingInformation><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:08838305:media:palo1210:palo1210-sup-0001-t01"></mediaResource><caption>Tab‐delimited Table 1.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:08838305:media:palo1210:palo1210-sup-0002-t02"></mediaResource><caption>Tab‐delimited Table 2.</caption></supportingInfoItem></supportingInformation><abstractGroup><abstract type="main"><p xml:id="palo1210-para-0001" label="1">Radiocarbon age relationships between co‐occurring planktic foraminifera, alkenones, and total organic carbon in sediments from the continental margins of southern Chile, northwest Africa, and the South China Sea were compared with published results from the Namibian margin. Age relationships between the sediment components are site‐specific and relatively constant over time. Similar to the Namibian slope, where alkenones have been reported to be 1000–4500 years older than co‐occurring foraminifera, alkenones were significantly (∼1000 years) older than co‐occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2σ error or better) in the NW African and South China Sea sediments. Total organic matter and alkenone ages were similar off Namibia (age difference TOC alkenones: 200–700 years), Chile (100–450 years), and NW Africa (360–770 years), suggesting minor contributions of preaged terrigenous material. In the South China Sea, total organic carbon is significantly (2000–3000 years) older owing to greater inputs of preaged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as seafloor morphology, shelf width, and sediment composition, may control the age of co‐occurring sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. Age offsets are correlated with organic richness, suggesting that formation of organic aggregates is a key process.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>An evaluation of 14C age relationships between co‐occurring foraminifera, alkenones, and total organic carbon in continental margin sediments</title></titleInfo><titleInfo type="abbreviated"><title>14C AGES OF FORAMS, ALKENONES, AND TOC</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>An evaluation of</title></titleInfo><name type="personal"><namePart type="given">Gesine</namePart><namePart type="family">Mollenhauer</namePart><affiliation>Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</affiliation><affiliation>E-mail: gmollenhauer@whoi.edu</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Markus</namePart><namePart type="family">Kienast</namePart><affiliation>Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA</affiliation><affiliation>Now at Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Frank</namePart><namePart type="family">Lamy</namePart><affiliation>GFZ‐Potsdam, Potsdam, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Helge</namePart><namePart type="family">Meggers</namePart><affiliation>Fachbereich Geowissenschaften, Universität Bremen, Bremen, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Ralph R.</namePart><namePart type="family">Schneider</namePart><affiliation>Institut für Geowissenschaften, Christian‐Albrechts‐Universität zu Kiel, Kiel, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">John M.</namePart><namePart type="family">Hayes</namePart><affiliation>National Ocean Sciences Accelerator Mass Spectrometry Facility, McLean Laboratory, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Timothy I.</namePart><namePart type="family">Eglinton</namePart><affiliation>Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Massachusetts, Woods Hole, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><dateIssued encoding="w3cdtf">2005-03</dateIssued><dateCaptured encoding="w3cdtf">2004-10-22</dateCaptured><dateValid encoding="w3cdtf">2005-01-25</dateValid><edition>Mollenhauer, G., M. Kienast, F. Lamy, H. Meggers, R. R. Schneider, J. M. Hayes, and T. I. Eglinton (2005), An evaluation of 14C age relationships between co‐occurring foraminifera, alkenones, and total organic carbon in continental margin sediments, Paleoceanography, 20, PA1016, doi:10.1029/2004PA001103.</edition><copyrightDate encoding="w3cdtf">2005</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">4</extent><extent unit="tables">2</extent></physicalDescription><abstract>Radiocarbon age relationships between co‐occurring planktic foraminifera, alkenones, and total organic carbon in sediments from the continental margins of southern Chile, northwest Africa, and the South China Sea were compared with published results from the Namibian margin. Age relationships between the sediment components are site‐specific and relatively constant over time. Similar to the Namibian slope, where alkenones have been reported to be 1000–4500 years older than co‐occurring foraminifera, alkenones were significantly (∼1000 years) older than co‐occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2σ error or better) in the NW African and South China Sea sediments. Total organic matter and alkenone ages were similar off Namibia (age difference TOC alkenones: 200–700 years), Chile (100–450 years), and NW Africa (360–770 years), suggesting minor contributions of preaged terrigenous material. In the South China Sea, total organic carbon is significantly (2000–3000 years) older owing to greater inputs of preaged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as seafloor morphology, shelf width, and sediment composition, may control the age of co‐occurring sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. Age offsets are correlated with organic richness, suggesting that formation of organic aggregates is a key process.</abstract><note type="additional physical form">Tab‐delimited Table 1.Tab‐delimited Table 2.</note><subject><genre>Keywords</genre><topic>compound‐specific radiocarbon dating</topic><topic>alkenones</topic><topic>high accumulation rate sediments</topic></subject><relatedItem type="host"><titleInfo><title>Paleoceanography</title></titleInfo><titleInfo type="abbreviated"><title>Paleoceanography</title></titleInfo><genre type="Journal">journal</genre><subject><genre>Index Terms</genre><topic authorityURI="http://psi.agu.org/taxonomy5/0400">BIOGEOSCIENCES</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0470">Nutrients and nutrient cycling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0428">Carbon cycling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1000">GEOCHEMISTRY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1040">Radiogenic isotope geochemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1050">Marine geochemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1800">HYDROLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1862">Sediment transport</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4500">OCEANOGRAPHY: PHYSICAL</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4558">Sediment transport</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4800">OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4850">Marine organic chemistry</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4806">Carbon cycling</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4900">PALEOCEANOGRAPHY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/4954">Sea surface temperature</topic></subject><identifier type="ISSN">0883-8305</identifier><identifier type="eISSN">1944-9186</identifier><identifier type="DOI">10.1002/(ISSN)1944-9186</identifier><identifier type="CODEN">POCGEP</identifier><identifier type="PublisherID">PALO</identifier><part><date>2005</date><detail type="volume"><caption>vol.</caption><number>20</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>12</total></extent></part></relatedItem><identifier type="istex">4B69B731AF9D28789B7C23A37684BCC3A8C1D44A</identifier><identifier type="DOI">10.1029/2004PA001103</identifier><identifier type="ArticleID">2004PA001103</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 2005 by the American Geophysical Union.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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