Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris
Identifieur interne : 000533 ( Istex/Corpus ); précédent : 000532; suivant : 000534Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris
Auteurs : C. Lécuyer ; P. Grandjean ; J. R. O'Neil ; H. Cappetta ; F. MartineauSource :
- Palaeogeography, Palaeoclimatology, Palaeoecology [ 0031-0182 ] ; 1993.
Abstract
High precision oxygen isotope analyses were made of phosphate extracted from 17 samples of nektonic and benthic fish debris sampled across the stratigraphic Cretaceous—Tertiary boundary in northern Morocco. A refinement of the silver phosphate method was used to isolate phosphate from biogenic materials. Measured δ18O values of 18.6–20.5‰ are interpreted as reflecting high-resolution thermal variations that affected the ocean water column of the western Tethys. The warm (27°C) water masses that characterized Maastrichtian times underwent rapid cooling and stabilized at an average temperature of 19°C during the Dano-Montian and Thanetian. This period of constant and cool temperature was followed by a relatively rapid but more gradual warming to about 25°C achieved in the Middle Ypresian. Significant small shifts in δ18O values between nektonic and benthic fauna recorded only during the stages of rapid warming or cooling may correspond to averaged thermal differences within the water column that developed in response to global climatic changes. The indicated temperature distribution could have been caused by thermal changes in the atmosphere rather than some signal carried by deep ocean currents. The oxygen isotope data coupled with previous measurements of REE and ϵNd(T) on the same samples support the suggestion that paleo-Pacific westward currents progressed as far as the northwestern part of the African platform at the end of the Cretaceous period.
Url:
DOI: 10.1016/0031-0182(93)90085-W
Links to Exploration step
ISTEX:5988FF678DA69DB96D70D4FA464977D01CB7E741Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris</title><author><name sortKey="Lecuyer, C" sort="Lecuyer, C" uniqKey="Lecuyer C" first="C." last="Lécuyer">C. Lécuyer</name><affiliation><mods:affiliation>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</mods:affiliation></affiliation></author><author><name sortKey="Grandjean, P" sort="Grandjean, P" uniqKey="Grandjean P" first="P." last="Grandjean">P. Grandjean</name><affiliation><mods:affiliation>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</mods:affiliation></affiliation></author><author><name sortKey="O Neil, J R" sort="O Neil, J R" uniqKey="O Neil J" first="J. R." last="O'Neil">J. R. O'Neil</name><affiliation><mods:affiliation>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</mods:affiliation></affiliation></author><author><name sortKey="Cappetta, H" sort="Cappetta, H" uniqKey="Cappetta H" first="H." last="Cappetta">H. Cappetta</name><affiliation><mods:affiliation>Laboratoire de Paléontologie, Place Eugène Bataillon, Université de Montpellier II, 34060 Montpellier, France</mods:affiliation></affiliation></author><author><name sortKey="Martineau, F" sort="Martineau, F" uniqKey="Martineau F" first="F." last="Martineau">F. Martineau</name><affiliation><mods:affiliation>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:5988FF678DA69DB96D70D4FA464977D01CB7E741</idno><date when="1993" year="1993">1993</date><idno type="doi">10.1016/0031-0182(93)90085-W</idno><idno type="url">https://api.istex.fr/document/5988FF678DA69DB96D70D4FA464977D01CB7E741/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000533</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000533</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris</title><author><name sortKey="Lecuyer, C" sort="Lecuyer, C" uniqKey="Lecuyer C" first="C." last="Lécuyer">C. Lécuyer</name><affiliation><mods:affiliation>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</mods:affiliation></affiliation></author><author><name sortKey="Grandjean, P" sort="Grandjean, P" uniqKey="Grandjean P" first="P." last="Grandjean">P. Grandjean</name><affiliation><mods:affiliation>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</mods:affiliation></affiliation></author><author><name sortKey="O Neil, J R" sort="O Neil, J R" uniqKey="O Neil J" first="J. R." last="O'Neil">J. R. O'Neil</name><affiliation><mods:affiliation>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</mods:affiliation></affiliation></author><author><name sortKey="Cappetta, H" sort="Cappetta, H" uniqKey="Cappetta H" first="H." last="Cappetta">H. Cappetta</name><affiliation><mods:affiliation>Laboratoire de Paléontologie, Place Eugène Bataillon, Université de Montpellier II, 34060 Montpellier, France</mods:affiliation></affiliation></author><author><name sortKey="Martineau, F" sort="Martineau, F" uniqKey="Martineau F" first="F." last="Martineau">F. Martineau</name><affiliation><mods:affiliation>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Palaeogeography, Palaeoclimatology, Palaeoecology</title><title level="j" type="abbrev">PALAEO</title><idno type="ISSN">0031-0182</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1993">1993</date><biblScope unit="volume">105</biblScope><biblScope unit="issue">3–4</biblScope><biblScope unit="page" from="235">235</biblScope><biblScope unit="page" to="243">243</biblScope></imprint><idno type="ISSN">0031-0182</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0031-0182</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">High precision oxygen isotope analyses were made of phosphate extracted from 17 samples of nektonic and benthic fish debris sampled across the stratigraphic Cretaceous—Tertiary boundary in northern Morocco. A refinement of the silver phosphate method was used to isolate phosphate from biogenic materials. Measured δ18O values of 18.6–20.5‰ are interpreted as reflecting high-resolution thermal variations that affected the ocean water column of the western Tethys. The warm (27°C) water masses that characterized Maastrichtian times underwent rapid cooling and stabilized at an average temperature of 19°C during the Dano-Montian and Thanetian. This period of constant and cool temperature was followed by a relatively rapid but more gradual warming to about 25°C achieved in the Middle Ypresian. Significant small shifts in δ18O values between nektonic and benthic fauna recorded only during the stages of rapid warming or cooling may correspond to averaged thermal differences within the water column that developed in response to global climatic changes. The indicated temperature distribution could have been caused by thermal changes in the atmosphere rather than some signal carried by deep ocean currents. The oxygen isotope data coupled with previous measurements of REE and ϵNd(T) on the same samples support the suggestion that paleo-Pacific westward currents progressed as far as the northwestern part of the African platform at the end of the Cretaceous period.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>C. Lécuyer</name><affiliations><json:string>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</json:string></affiliations></json:item><json:item><name>P. Grandjean</name><affiliations><json:string>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</json:string></affiliations></json:item><json:item><name>J.R. O'Neil</name><affiliations><json:string>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</json:string></affiliations></json:item><json:item><name>H. Cappetta</name><affiliations><json:string>Laboratoire de Paléontologie, Place Eugène Bataillon, Université de Montpellier II, 34060 Montpellier, France</json:string></affiliations></json:item><json:item><name>F. Martineau</name><affiliations><json:string>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</json:string></affiliations></json:item></author><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>High precision oxygen isotope analyses were made of phosphate extracted from 17 samples of nektonic and benthic fish debris sampled across the stratigraphic Cretaceous—Tertiary boundary in northern Morocco. A refinement of the silver phosphate method was used to isolate phosphate from biogenic materials. Measured δ18O values of 18.6–20.5‰ are interpreted as reflecting high-resolution thermal variations that affected the ocean water column of the western Tethys. The warm (27°C) water masses that characterized Maastrichtian times underwent rapid cooling and stabilized at an average temperature of 19°C during the Dano-Montian and Thanetian. This period of constant and cool temperature was followed by a relatively rapid but more gradual warming to about 25°C achieved in the Middle Ypresian. Significant small shifts in δ18O values between nektonic and benthic fauna recorded only during the stages of rapid warming or cooling may correspond to averaged thermal differences within the water column that developed in response to global climatic changes. The indicated temperature distribution could have been caused by thermal changes in the atmosphere rather than some signal carried by deep ocean currents. The oxygen isotope data coupled with previous measurements of REE and ϵNd(T) on the same samples support the suggestion that paleo-Pacific westward currents progressed as far as the northwestern part of the African platform at the end of the Cretaceous period.</abstract><qualityIndicators><score>7.616</score><pdfVersion>1.3</pdfVersion><pdfPageSize>576 x 792 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>1474</abstractCharCount><pdfWordCount>5357</pdfWordCount><pdfCharCount>33090</pdfCharCount><pdfPageCount>9</pdfPageCount><abstractWordCount>218</abstractWordCount></qualityIndicators><title>Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris</title><pii><json:string>0031-0182(93)90085-W</json:string></pii><genre><json:string>research-article</json:string></genre><serie><editor><json:item><name>H.P. Taylor, Jr.</name></json:item><json:item><name>J.R. O'Neil</name></json:item><json:item><name>I.R. Kaplan</name></json:item></editor><pages><last>119</last><first>105</first></pages><language><json:string>unknown</json:string></language><title>Stable Isotope Geochemistry: A Tribute to Samuel Epstein</title></serie><host><volume>105</volume><pii><json:string>S0031-0182(00)X0341-0</json:string></pii><pages><last>243</last><first>235</first></pages><issn><json:string>0031-0182</json:string></issn><issue>3–4</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><title>Palaeogeography, Palaeoclimatology, Palaeoecology</title><publicationDate>1993</publicationDate></host><categories><wos><json:string>science</json:string><json:string>paleontology</json:string><json:string>geosciences, multidisciplinary</json:string><json:string>geography, physical</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>paleontology</json:string></scienceMetrix><inist><json:string>sciences appliquees, technologies et medecines</json:string><json:string>sciences biologiques et medicales</json:string><json:string>sciences biologiques fondamentales et appliquees. psychologie</json:string><json:string>invertebres</json:string></inist></categories><publicationDate>1993</publicationDate><copyrightDate>1993</copyrightDate><doi><json:string>10.1016/0031-0182(93)90085-W</json:string></doi><id>5988FF678DA69DB96D70D4FA464977D01CB7E741</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/5988FF678DA69DB96D70D4FA464977D01CB7E741/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/5988FF678DA69DB96D70D4FA464977D01CB7E741/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/5988FF678DA69DB96D70D4FA464977D01CB7E741/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>ELSEVIER</p></availability><date>1993</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris</title><author xml:id="author-0000"><persName><forename type="first">C.</forename><surname>Lécuyer</surname></persName><affiliation>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</affiliation></author><author xml:id="author-0001"><persName><forename type="first">P.</forename><surname>Grandjean</surname></persName><affiliation>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</affiliation></author><author xml:id="author-0002"><persName><forename type="first">J.R.</forename><surname>O'Neil</surname></persName><affiliation>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</affiliation></author><author xml:id="author-0003"><persName><forename type="first">H.</forename><surname>Cappetta</surname></persName><affiliation>Laboratoire de Paléontologie, Place Eugène Bataillon, Université de Montpellier II, 34060 Montpellier, France</affiliation></author><author xml:id="author-0004"><persName><forename type="first">F.</forename><surname>Martineau</surname></persName><affiliation>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</affiliation></author><idno type="istex">5988FF678DA69DB96D70D4FA464977D01CB7E741</idno><idno type="DOI">10.1016/0031-0182(93)90085-W</idno><idno type="PII">0031-0182(93)90085-W</idno></analytic><monogr><title level="j">Palaeogeography, Palaeoclimatology, Palaeoecology</title><title level="j" type="abbrev">PALAEO</title><idno type="pISSN">0031-0182</idno><idno type="PII">S0031-0182(00)X0341-0</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1993"></date><biblScope unit="volume">105</biblScope><biblScope unit="issue">3–4</biblScope><biblScope unit="page" from="235">235</biblScope><biblScope unit="page" to="243">243</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1993</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>High precision oxygen isotope analyses were made of phosphate extracted from 17 samples of nektonic and benthic fish debris sampled across the stratigraphic Cretaceous—Tertiary boundary in northern Morocco. A refinement of the silver phosphate method was used to isolate phosphate from biogenic materials. Measured δ18O values of 18.6–20.5‰ are interpreted as reflecting high-resolution thermal variations that affected the ocean water column of the western Tethys. The warm (27°C) water masses that characterized Maastrichtian times underwent rapid cooling and stabilized at an average temperature of 19°C during the Dano-Montian and Thanetian. This period of constant and cool temperature was followed by a relatively rapid but more gradual warming to about 25°C achieved in the Middle Ypresian. Significant small shifts in δ18O values between nektonic and benthic fauna recorded only during the stages of rapid warming or cooling may correspond to averaged thermal differences within the water column that developed in response to global climatic changes. The indicated temperature distribution could have been caused by thermal changes in the atmosphere rather than some signal carried by deep ocean currents. The oxygen isotope data coupled with previous measurements of REE and ϵNd(T) on the same samples support the suggestion that paleo-Pacific westward currents progressed as far as the northwestern part of the African platform at the end of the Cretaceous period.</p></abstract></profileDesc><revisionDesc><change when="1993">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/5988FF678DA69DB96D70D4FA464977D01CB7E741/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>PALAEO</jid><aid>9390085W</aid><ce:pii>0031-0182(93)90085-W</ce:pii><ce:doi>10.1016/0031-0182(93)90085-W</ce:doi><ce:copyright type="unknown" year="1993"></ce:copyright></item-info><head><ce:title>Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ<ce:sup>18</ce:sup>O record of phosphatic fish debris</ce:title><ce:author-group><ce:author><ce:given-name>C.</ce:given-name><ce:surname>Lécuyer</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>P.</ce:given-name><ce:surname>Grandjean</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>J.R.</ce:given-name><ce:surname>O'Neil</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>H.</ce:given-name><ce:surname>Cappetta</ce:surname><ce:cross-ref refid="AFF3"><ce:sup>c</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>F.</ce:given-name><ce:surname>Martineau</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>a</ce:label><ce:textfn>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>b</ce:label><ce:textfn>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</ce:textfn></ce:affiliation><ce:affiliation id="AFF3"><ce:label>c</ce:label><ce:textfn>Laboratoire de Paléontologie, Place Eugène Bataillon, Université de Montpellier II, 34060 Montpellier, France</ce:textfn></ce:affiliation></ce:author-group><ce:date-received day="24" month="11" year="1992"></ce:date-received><ce:date-accepted day="27" month="5" year="1993"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>High precision oxygen isotope analyses were made of phosphate extracted from 17 samples of nektonic and benthic fish debris sampled across the stratigraphic Cretaceous—Tertiary boundary in northern Morocco. A refinement of the silver phosphate method was used to isolate phosphate from biogenic materials. Measured δ<ce:sup>18</ce:sup>O values of 18.6–20.5‰ are interpreted as reflecting high-resolution thermal variations that affected the ocean water column of the western Tethys. The warm (27°C) water masses that characterized Maastrichtian times underwent rapid cooling and stabilized at an average temperature of 19°C during the Dano-Montian and Thanetian. This period of constant and cool temperature was followed by a relatively rapid but more gradual warming to about 25°C achieved in the Middle Ypresian. Significant small shifts in δ<ce:sup>18</ce:sup>O values between nektonic and benthic fauna recorded only during the stages of rapid warming or cooling may correspond to averaged thermal differences within the water column that developed in response to global climatic changes. The indicated temperature distribution could have been caused by thermal changes in the atmosphere rather than some signal carried by deep ocean currents. The oxygen isotope data coupled with previous measurements of REE and ϵ<ce:inf>Nd(T)</ce:inf> on the same samples support the suggestion that paleo-Pacific westward currents progressed as far as the northwestern part of the African platform at the end of the Cretaceous period.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ</title></titleInfo><name type="personal"><namePart type="given">C.</namePart><namePart type="family">Lécuyer</namePart><affiliation>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">P.</namePart><namePart type="family">Grandjean</namePart><affiliation>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.R.</namePart><namePart type="family">O'Neil</namePart><affiliation>Stable Isotope Laboratory, Department of Geological Sciences, University of Michigan, 1006 C.C. Little Building, Ann Arbor MI 48109-1063, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">H.</namePart><namePart type="family">Cappetta</namePart><affiliation>Laboratoire de Paléontologie, Place Eugène Bataillon, Université de Montpellier II, 34060 Montpellier, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">F.</namePart><namePart type="family">Martineau</namePart><affiliation>Laboratoire de Géochimie Isotopique, Géosciences Rennes, UPR 4661 CNRS, Université de Rennes I, 35042 Rennes cédex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1993</dateIssued><copyrightDate encoding="w3cdtf">1993</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">High precision oxygen isotope analyses were made of phosphate extracted from 17 samples of nektonic and benthic fish debris sampled across the stratigraphic Cretaceous—Tertiary boundary in northern Morocco. A refinement of the silver phosphate method was used to isolate phosphate from biogenic materials. Measured δ18O values of 18.6–20.5‰ are interpreted as reflecting high-resolution thermal variations that affected the ocean water column of the western Tethys. The warm (27°C) water masses that characterized Maastrichtian times underwent rapid cooling and stabilized at an average temperature of 19°C during the Dano-Montian and Thanetian. This period of constant and cool temperature was followed by a relatively rapid but more gradual warming to about 25°C achieved in the Middle Ypresian. Significant small shifts in δ18O values between nektonic and benthic fauna recorded only during the stages of rapid warming or cooling may correspond to averaged thermal differences within the water column that developed in response to global climatic changes. The indicated temperature distribution could have been caused by thermal changes in the atmosphere rather than some signal carried by deep ocean currents. The oxygen isotope data coupled with previous measurements of REE and ϵNd(T) on the same samples support the suggestion that paleo-Pacific westward currents progressed as far as the northwestern part of the African platform at the end of the Cretaceous period.</abstract><relatedItem type="host"><titleInfo><title>Palaeogeography, Palaeoclimatology, Palaeoecology</title></titleInfo><titleInfo type="abbreviated"><title>PALAEO</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">199311</dateIssued></originInfo><identifier type="ISSN">0031-0182</identifier><identifier type="PII">S0031-0182(00)X0341-0</identifier><part><date>199311</date><detail type="volume"><number>105</number><caption>vol.</caption></detail><detail type="issue"><number>3–4</number><caption>no.</caption></detail><extent unit="issue pages"><start>171</start><end>375</end></extent><extent unit="pages"><start>235</start><end>243</end></extent></part></relatedItem><identifier type="istex">5988FF678DA69DB96D70D4FA464977D01CB7E741</identifier><identifier type="DOI">10.1016/0031-0182(93)90085-W</identifier><identifier type="PII">0031-0182(93)90085-W</identifier><recordInfo><recordContentSource>ELSEVIER</recordContentSource></recordInfo></mods></metadata></istex></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Terre/explor/NickelMaghrebV1/Data/Istex/Corpus
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000533 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Istex/Corpus/biblio.hfd -nk 000533 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Terre
|area= NickelMaghrebV1
|flux= Istex
|étape= Corpus
|type= RBID
|clé= ISTEX:5988FF678DA69DB96D70D4FA464977D01CB7E741
|texte= Thermal excursions in the ocean at the Cretaceous—Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris
}}
| This area was generated with Dilib version V0.6.27. |  |