Radiocarbon Age Offsets in Different-Sized Carbonate Components of Deep-Sea Sediments
We compared accelerator mass spectrometry (AMS) 14C ages of large (>150 μm) pelagic foraminifera with radiometric bulk carbonate 14C ages in two northeastern Atlantic cores. The foraminiferal ages are consistently older than those of the bulk sediment (by + 0.76 ka in Core 11881 and by + 1.1 ka i...
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| Veröffentlicht in: | Radiocarbon 1995, Vol.37 (2), p.91-101 |
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| container_title | Radiocarbon |
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| creator | Thomson, John Cook, G. T. Anderson, Robert MacKenzie, A. B. Harkness, D. D. McCave, I.N. |
| description | We compared accelerator mass spectrometry (AMS) 14C ages of large (>150 μm) pelagic foraminifera with radiometric bulk carbonate 14C ages in two northeastern Atlantic cores. The foraminiferal ages are consistently older than those of the bulk sediment (by + 0.76 ka in Core 11881 and by + 1.1 ka in Core 11886), whereas corresponding fine ( |
| doi_str_mv | 10.1017/S0033822200030526 |
| format | Article |
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T. ; Anderson, Robert ; MacKenzie, A. B. ; Harkness, D. D. ; McCave, I.N.</creator><creatorcontrib>Thomson, John ; Cook, G. T. ; Anderson, Robert ; MacKenzie, A. B. ; Harkness, D. D. ; McCave, I.N.</creatorcontrib><description>We compared accelerator mass spectrometry (AMS) 14C ages of large (>150 μm) pelagic foraminifera with radiometric bulk carbonate 14C ages in two northeastern Atlantic cores. The foraminiferal ages are consistently older than those of the bulk sediment (by + 0.76 ka in Core 11881 and by + 1.1 ka in Core 11886), whereas corresponding fine (<5 μm) fraction ages are similar to those of the bulk sediment carbonate. We calculated near-identical sediment accumulation rates from both the foraminiferal and bulk sediment age/depth relations (3.0 cm ka−1 in Core 11881 and 5.9 cm ka−1 in Core 11886). Consideration of various factors that might produce such offsets leads us to believe that they are not artifacts, but were most probably caused by differential bioturbation of the different size-fractions in the sediment surface mixed layer. The importance of this finding is that many paleoceanographic records, such as the oxygen isotope record, also derive from analyses of large foraminifera, so that these records must be offset in time from the bulk of the sediments that they characterize.</description><identifier>ISSN: 0033-8222</identifier><identifier>EISSN: 1945-5755</identifier><identifier>DOI: 10.1017/S0033822200030526</identifier><language>eng</language><publisher>New York, US: Cambridge University Press</publisher><subject>A. 14C in Carbonates, Sediments, Shells, Tephra and Other Environmental Media ; Excavation and methods ; I. 14C in the Reconstruction of Past Environments ; Laboratory methods ; Methodology and general studies ; Physical and chemical analysis ; Prehistory and protohistory</subject><ispartof>Radiocarbon, 1995, Vol.37 (2), p.91-101</ispartof><rights>Copyright © the Department of Geosciences, The University of Arizona</rights><rights>1996 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a382t-82a48552a0c2788b5d92aa248d8d989e952903fc01f2e9b7d08a1723808a22703</citedby><cites>FETCH-LOGICAL-a382t-82a48552a0c2788b5d92aa248d8d989e952903fc01f2e9b7d08a1723808a22703</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S0033822200030526/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,309,310,314,780,784,789,790,4021,4047,4048,23928,23929,25138,27921,27922,27923,55626</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=3285489$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Thomson, John</creatorcontrib><creatorcontrib>Cook, G. T.</creatorcontrib><creatorcontrib>Anderson, Robert</creatorcontrib><creatorcontrib>MacKenzie, A. B.</creatorcontrib><creatorcontrib>Harkness, D. D.</creatorcontrib><creatorcontrib>McCave, I.N.</creatorcontrib><title>Radiocarbon Age Offsets in Different-Sized Carbonate Components of Deep-Sea Sediments</title><title>Radiocarbon</title><addtitle>Radiocarbon</addtitle><description>We compared accelerator mass spectrometry (AMS) 14C ages of large (>150 μm) pelagic foraminifera with radiometric bulk carbonate 14C ages in two northeastern Atlantic cores. The foraminiferal ages are consistently older than those of the bulk sediment (by + 0.76 ka in Core 11881 and by + 1.1 ka in Core 11886), whereas corresponding fine (<5 μm) fraction ages are similar to those of the bulk sediment carbonate. We calculated near-identical sediment accumulation rates from both the foraminiferal and bulk sediment age/depth relations (3.0 cm ka−1 in Core 11881 and 5.9 cm ka−1 in Core 11886). Consideration of various factors that might produce such offsets leads us to believe that they are not artifacts, but were most probably caused by differential bioturbation of the different size-fractions in the sediment surface mixed layer. The importance of this finding is that many paleoceanographic records, such as the oxygen isotope record, also derive from analyses of large foraminifera, so that these records must be offset in time from the bulk of the sediments that they characterize.</description><subject>A. 14C in Carbonates, Sediments, Shells, Tephra and Other Environmental Media</subject><subject>Excavation and methods</subject><subject>I. 14C in the Reconstruction of Past Environments</subject><subject>Laboratory methods</subject><subject>Methodology and general studies</subject><subject>Physical and chemical analysis</subject><subject>Prehistory and protohistory</subject><issn>0033-8222</issn><issn>1945-5755</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1995</creationdate><recordtype>article</recordtype><recordid>eNp9UMlOwzAQtRBIlMIHcPOBa8B24sY-VimbVKkSoedoEo8rV80iOxzg63FoxQWJ04zmLXrzCLnl7J4znj-UjKWpEkKwuDApFmdkxnUmE5lLeU5mE5xM-CW5CmHPmOALlc_I9g2M6xvwdd_R5Q7pxtqAY6CuoytnLXrsxqR0X2ho8cOCEWnRt0PfRSTQ3tIV4pCUCLRE49rpek0uLBwC3pzmnGyfHt-Ll2S9eX4tlusEYtYx5oFMSSmANSJXqpZGCwCRKaOMVhq1FJqltmHcCtR1bpgCnotUxSlEztI54UffxvcheLTV4F0L_rPirJp6qf70EjV3R80AoYGD9dA1LvwKU6FkpnSkpSdraGvvzA6rff_hu_jOP-bfRVhv0w</recordid><startdate>1995</startdate><enddate>1995</enddate><creator>Thomson, John</creator><creator>Cook, G. T.</creator><creator>Anderson, Robert</creator><creator>MacKenzie, A. B.</creator><creator>Harkness, D. D.</creator><creator>McCave, I.N.</creator><general>Cambridge University Press</general><general>University of Arizona</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>1995</creationdate><title>Radiocarbon Age Offsets in Different-Sized Carbonate Components of Deep-Sea Sediments</title><author>Thomson, John ; Cook, G. T. ; Anderson, Robert ; MacKenzie, A. B. ; Harkness, D. D. ; McCave, I.N.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a382t-82a48552a0c2788b5d92aa248d8d989e952903fc01f2e9b7d08a1723808a22703</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1995</creationdate><topic>A. 14C in Carbonates, Sediments, Shells, Tephra and Other Environmental Media</topic><topic>Excavation and methods</topic><topic>I. 14C in the Reconstruction of Past Environments</topic><topic>Laboratory methods</topic><topic>Methodology and general studies</topic><topic>Physical and chemical analysis</topic><topic>Prehistory and protohistory</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Thomson, John</creatorcontrib><creatorcontrib>Cook, G. T.</creatorcontrib><creatorcontrib>Anderson, Robert</creatorcontrib><creatorcontrib>MacKenzie, A. B.</creatorcontrib><creatorcontrib>Harkness, D. 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D.</au><au>McCave, I.N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Radiocarbon Age Offsets in Different-Sized Carbonate Components of Deep-Sea Sediments</atitle><jtitle>Radiocarbon</jtitle><addtitle>Radiocarbon</addtitle><date>1995</date><risdate>1995</risdate><volume>37</volume><issue>2</issue><spage>91</spage><epage>101</epage><pages>91-101</pages><issn>0033-8222</issn><eissn>1945-5755</eissn><abstract>We compared accelerator mass spectrometry (AMS) 14C ages of large (>150 μm) pelagic foraminifera with radiometric bulk carbonate 14C ages in two northeastern Atlantic cores. The foraminiferal ages are consistently older than those of the bulk sediment (by + 0.76 ka in Core 11881 and by + 1.1 ka in Core 11886), whereas corresponding fine (<5 μm) fraction ages are similar to those of the bulk sediment carbonate. We calculated near-identical sediment accumulation rates from both the foraminiferal and bulk sediment age/depth relations (3.0 cm ka−1 in Core 11881 and 5.9 cm ka−1 in Core 11886). Consideration of various factors that might produce such offsets leads us to believe that they are not artifacts, but were most probably caused by differential bioturbation of the different size-fractions in the sediment surface mixed layer. The importance of this finding is that many paleoceanographic records, such as the oxygen isotope record, also derive from analyses of large foraminifera, so that these records must be offset in time from the bulk of the sediments that they characterize.</abstract><cop>New York, US</cop><pub>Cambridge University Press</pub><doi>10.1017/S0033822200030526</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Radiocarbon, 1995, Vol.37 (2), p.91-101 |
| issn | 0033-8222 1945-5755 |
| language | eng |
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| source | EZB-FREE-00999 freely available EZB journals; Free Full-Text Journals in Chemistry; Cambridge University Press Journals Complete |
| subjects | A. 14C in Carbonates, Sediments, Shells, Tephra and Other Environmental Media Excavation and methods I. 14C in the Reconstruction of Past Environments Laboratory methods Methodology and general studies Physical and chemical analysis Prehistory and protohistory |
| title | Radiocarbon Age Offsets in Different-Sized Carbonate Components of Deep-Sea Sediments |
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