Spatial variability of watermass conditions within the European Epicontinental Seaway during the Early Jurassic (Pliensbachian–Toarcian)
Identifieur interne : 002A74 ( Istex/Corpus ); précédent : 002A73; suivant : 002A75Spatial variability of watermass conditions within the European Epicontinental Seaway during the Early Jurassic (Pliensbachian–Toarcian)
Auteurs : Dario Harazim ; Bas Van De Schootbrugge ; Katrin Sorichter ; Jens Fiebig ; Andries Weug ; Guillaume Suan ; Wolfgang OschmannSource :
- Sedimentology [ 0037-0746 ] ; 2013-02.
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Abstract
In order to constrain spatial variability in watermass conditions within the European Epicontinental Seaway prior to, during and after the Toarcian Oceanic Anoxic Event, carbon (δ13Cbel, δ13Ccarb) and oxygen (δ18Obel, δ18Ocarb) isotope records were obtained from three sections in the Grands Causses Basin (southern France). These data were then compared with similar records along a north–south transect across the European Epicontinental Seaway. As the conclusions reached here strongly depend on the reliability of belemnite calcites as archives of palaeoceanographic changes, an attempt was made to improve the understanding of isotope signals recorded in belemnite calcite. Intra‐rostral carbon and oxygen‐isotope data from six belemnite specimens belonging to the genus Passaloteuthis were collected. Intra‐rostral carbon‐isotopes are influenced by vital effects, whereas oxygen‐isotopes reflect relative changes in temperature and salinity. Palaeotemperatures calculated from δ18Obel‐isotope records from the Grands Causses Basin confirm relatively low temperatures throughout the Late Pliensbachian. Similar cool water conditions have previously been shown in Germany, England, Spain and Portugal. A temperature increase of up to 6 °C is observed across the Pliensbachian–Toarcian boundary. A pronounced negative shift of at least −3‰ (Vienna‐Pee Dee Belemnite) is recorded in bulk carbonate carbon during the lower Harpoceras serpentinum zone, typical of the Toarcian Oceanic Anoxic Event. Before and after the Toarcian Oceanic Anoxic Event, a good correlation between δ13Ccarb and δ13Cbel exists, indicating well‐ventilated bottom‐waters and normal marine conditions. Instead, data for the Toarcian Oceanic Anoxic Event indicate the development of a strong north–south gradient in salinity stratification and surface‐water productivity for the Western Tethyan realm. This study thus lends further support to a pronounced regional overprint on carbon and oxygen‐isotope records in epicontinental seaways.
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DOI: 10.1111/j.1365-3091.2012.01344.x
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variability in watermass conditions within the European Epicontinental Seaway prior to, during and after the Toarcian Oceanic Anoxic Event, carbon (δ13Cbel, δ13Ccarb) and oxygen (δ18Obel, δ18Ocarb) isotope records were obtained from three sections in the Grands Causses Basin (southern France). These data were then compared with similar records along a north–south transect across the European Epicontinental Seaway. As the conclusions reached here strongly depend on the reliability of belemnite calcites as archives of palaeoceanographic changes, an attempt was made to improve the understanding of isotope signals recorded in belemnite calcite. Intra‐rostral carbon and oxygen‐isotope data from six belemnite specimens belonging to the genus Passaloteuthis were collected. Intra‐rostral carbon‐isotopes are influenced by vital effects, whereas oxygen‐isotopes reflect relative changes in temperature and salinity. Palaeotemperatures calculated from δ18Obel‐isotope records from the Grands Causses Basin confirm relatively low temperatures throughout the Late Pliensbachian. Similar cool water conditions have previously been shown in Germany, England, Spain and Portugal. A temperature increase of up to 6 °C is observed across the Pliensbachian–Toarcian boundary. A pronounced negative shift of at least −3‰ (Vienna‐Pee Dee Belemnite) is recorded in bulk carbonate carbon during the lower Harpoceras serpentinum zone, typical of the Toarcian Oceanic Anoxic Event. Before and after the Toarcian Oceanic Anoxic Event, a good correlation between δ13Ccarb and δ13Cbel exists, indicating well‐ventilated bottom‐waters and normal marine conditions. Instead, data for the Toarcian Oceanic Anoxic Event indicate the development of a strong north–south gradient in salinity stratification and surface‐water productivity for the Western Tethyan realm. 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These data were then compared with similar records along a north–south transect across the European Epicontinental Seaway. As the conclusions reached here strongly depend on the reliability of belemnite calcites as archives of palaeoceanographic changes, an attempt was made to improve the understanding of isotope signals recorded in belemnite calcite. Intra‐rostral carbon and oxygen‐isotope data from six belemnite specimens belonging to the genus Passaloteuthis were collected. Intra‐rostral carbon‐isotopes are influenced by vital effects, whereas oxygen‐isotopes reflect relative changes in temperature and salinity. Palaeotemperatures calculated from δ18Obel‐isotope records from the Grands Causses Basin confirm relatively low temperatures throughout the Late Pliensbachian. Similar cool water conditions have previously been shown in Germany, England, Spain and Portugal. A temperature increase of up to 6 °C is observed across the Pliensbachian–Toarcian boundary. A pronounced negative shift of at least −3‰ (Vienna‐Pee Dee Belemnite) is recorded in bulk carbonate carbon during the lower Harpoceras serpentinum zone, typical of the Toarcian Oceanic Anoxic Event. Before and after the Toarcian Oceanic Anoxic Event, a good correlation between δ13Ccarb and δ13Cbel exists, indicating well‐ventilated bottom‐waters and normal marine conditions. Instead, data for the Toarcian Oceanic Anoxic Event indicate the development of a strong north–south gradient in salinity stratification and surface‐water productivity for the Western Tethyan realm. 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These data were then compared with similar records along a north–south transect across the European Epicontinental Seaway. As the conclusions reached here strongly depend on the reliability of belemnite calcites as archives of palaeoceanographic changes, an attempt was made to improve the understanding of isotope signals recorded in belemnite calcite. Intra‐rostral carbon and oxygen‐isotope data from six belemnite specimens belonging to the genus Passaloteuthis were collected. Intra‐rostral carbon‐isotopes are influenced by vital effects, whereas oxygen‐isotopes reflect relative changes in temperature and salinity. Palaeotemperatures calculated from δ18Obel‐isotope records from the Grands Causses Basin confirm relatively low temperatures throughout the Late Pliensbachian. Similar cool water conditions have previously been shown in Germany, England, Spain and Portugal. A temperature increase of up to 6 °C is observed across the Pliensbachian–Toarcian boundary. A pronounced negative shift of at least −3‰ (Vienna‐Pee Dee Belemnite) is recorded in bulk carbonate carbon during the lower Harpoceras serpentinum zone, typical of the Toarcian Oceanic Anoxic Event. Before and after the Toarcian Oceanic Anoxic Event, a good correlation between δ13Ccarb and δ13Cbel exists, indicating well‐ventilated bottom‐waters and normal marine conditions. Instead, data for the Toarcian Oceanic Anoxic Event indicate the development of a strong north–south gradient in salinity stratification and surface‐water productivity for the Western Tethyan realm. This study thus lends further support to a pronounced regional overprint on carbon and oxygen‐isotope records in epicontinental seaways.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>keywords</head><item><term>Belemnites</term></item><item><term>carbon and oxygen stable isotopes</term></item><item><term>Early Jurassic</term></item><item><term>Oceanic Anoxic Event</term></item><item><term>palaeoceanography</term></item><item><term>Toarcian</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2013-02">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api-v5.istex.fr/document/7FC7A76A2A7FC58D14D0F7105925D1E7C7C8907B/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 version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1365-3091</doi><issn type="print">0037-0746</issn><issn type="electronic">1365-3091</issn><idGroup><id type="product" value="SED"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="SEDIMENTOLOGY">Sedimentology</title></titleGroup></publicationMeta><publicationMeta level="part" position="02102"><doi origin="wiley">10.1111/sed.2013.60.issue-2</doi><numberingGroup><numbering type="journalVolume" number="60">60</numbering><numbering type="journalIssue" number="2">2</numbering></numberingGroup><coverDate startDate="2013-02">February 2013</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="1" status="forIssue"><doi origin="wiley">10.1111/j.1365-3091.2012.01344.x</doi><idGroup><id type="unit" value="SED1344"></id></idGroup><countGroup><count type="pageTotal" number="32"></count></countGroup><titleGroup><title type="tocHeading1">Original articles</title></titleGroup><copyright>© 2012 The Authors. Journal compilation © 2012 International Association of Sedimentologists</copyright><eventGroup><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:3.2.2 mode:FullText" date="2013-06-05"></event><event type="publishedOnlineEarlyUnpaginated" date="2012-08-21"></event><event type="publishedOnlineFinalForm" date="2013-01-30"></event><event type="firstOnline" date="2012-08-21"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:4.0.1" date="2014-03-20"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.6.4 mode:FullText" date="2015-10-04"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="359">359</numbering><numbering type="pageLast" number="390">390</numbering></numberingGroup><linkGroup><link type="toTypesetVersion" href="file:SED.SED1344.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Manuscript received 21 August 2011; revision accepted 31 May 2012</unparsedEditorialHistory><countGroup><count type="figureTotal" number="8"></count><count type="tableTotal" number="3"></count></countGroup><titleGroup><title type="main">Spatial variability of watermass conditions within the European Epicontinental Seaway during the Early Jurassic (Pliensbachian–Toarcian)</title><title type="shortAuthors"><i>D. Harazim et al.</i></title><title type="short"><i>Jurassic spatial palaeoceanography</i></title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>DARIO</givenNames><familyName>HARAZIM</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>BAS</givenNames><familyName>VAN DE SCHOOTBRUGGE</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a2"><personName><givenNames>KATRIN</givenNames><familyName>SORICHTER</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a2"><personName><givenNames>JENS</givenNames><familyName>FIEBIG</familyName></personName></creator><creator creatorRole="author" xml:id="cr5" affiliationRef="#a2"><personName><givenNames>ANDRIES</givenNames><familyName>WEUG</familyName></personName></creator><creator creatorRole="author" xml:id="cr6" affiliationRef="#a3"><personName><givenNames>GUILLAUME</givenNames><familyName>SUAN</familyName></personName></creator><creator creatorRole="author" xml:id="cr7" affiliationRef="#a2"><personName><givenNames>WOLFGANG</givenNames><familyName>OSCHMANN</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="CA"><unparsedAffiliation> Department of Earth Sciences, Memorial University of Newfoundland, 300 Prince Philip Drive, St John’s, NL, Canada A1B 3X5 <sc>(</sc>E‐mail: <email>dharazim@mun.ca</email>)</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="DE"><unparsedAffiliation>Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="FR"><unparsedAffiliation>Departement Sciences de la Terre, Laboratoire de Géologie de Lyon: Terre, Planètes, et Environnement, Université Claude‐Bernard‐Lyon I, Batîment Géode, 2 Rue Raphael Dubois, 69622 Villeurbanne Cedex, France</unparsedAffiliation></affiliation><affiliation xml:id="a4"><unparsedAffiliation>Associate Editor – Adrian Immenhauser</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">Belemnites</keyword><keyword xml:id="k2">carbon and oxygen stable isotopes</keyword><keyword xml:id="k3">Early Jurassic</keyword><keyword xml:id="k4">Oceanic Anoxic Event</keyword><keyword xml:id="k5">palaeoceanography</keyword><keyword xml:id="k6">Toarcian</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract</title><p>In order to constrain spatial variability in watermass conditions within the European Epicontinental Seaway prior to, during and after the Toarcian Oceanic Anoxic Event, carbon (δ<sup>13</sup>C<sub>bel</sub>, δ<sup>13</sup>C<sub>carb</sub>) and oxygen (δ<sup>18</sup>O<sub>bel</sub>, δ<sup>18</sup>O<sub>carb</sub>) isotope records were obtained from three sections in the Grands Causses Basin (southern France). These data were then compared with similar records along a north–south transect across the European Epicontinental Seaway. As the conclusions reached here strongly depend on the reliability of belemnite calcites as archives of palaeoceanographic changes, an attempt was made to improve the understanding of isotope signals recorded in belemnite calcite. Intra‐rostral carbon and oxygen‐isotope data from six belemnite specimens belonging to the genus <i>Passaloteuthis</i> were collected. Intra‐rostral carbon‐isotopes are influenced by vital effects, whereas oxygen‐isotopes reflect relative changes in temperature and salinity. Palaeotemperatures calculated from δ<sup>18</sup>O<sub>bel</sub>‐isotope records from the Grands Causses Basin confirm relatively low temperatures throughout the Late Pliensbachian. Similar cool water conditions have previously been shown in Germany, England, Spain and Portugal. A temperature increase of up to 6 °C is observed across the Pliensbachian–Toarcian boundary. A pronounced negative shift of at least −3‰ (Vienna‐Pee Dee Belemnite) is recorded in bulk carbonate carbon during the lower <i>Harpoceras serpentinum</i> zone, typical of the Toarcian Oceanic Anoxic Event. Before and after the Toarcian Oceanic Anoxic Event, a good correlation between δ<sup>13</sup>C<sub>carb</sub> and δ<sup>13</sup>C<sub>bel</sub> exists, indicating well‐ventilated bottom‐waters and normal marine conditions. Instead, data for the Toarcian Oceanic Anoxic Event indicate the development of a strong north–south gradient in salinity stratification and surface‐water productivity for the Western Tethyan realm. This study thus lends further support to a pronounced regional overprint on carbon and oxygen‐isotope records in epicontinental seaways.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Spatial variability of watermass conditions within the European Epicontinental Seaway during the Early Jurassic (Pliensbachian–Toarcian)</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Jurassic spatial palaeoceanography</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Spatial variability of watermass conditions within the European Epicontinental Seaway during the Early Jurassic (Pliensbachian–Toarcian)</title></titleInfo><name type="personal"><namePart type="given">DARIO</namePart><namePart type="family">HARAZIM</namePart><affiliation>Department of Earth Sciences, Memorial University of Newfoundland, 300 Prince Philip Drive, St John’s, NL, Canada A1B 3X5 (E‐mail: dharazim@mun.ca)</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">BAS</namePart><namePart type="family">VAN DE SCHOOTBRUGGE</namePart><affiliation>Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">KATRIN</namePart><namePart type="family">SORICHTER</namePart><affiliation>Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">JENS</namePart><namePart type="family">FIEBIG</namePart><affiliation>Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">ANDRIES</namePart><namePart type="family">WEUG</namePart><affiliation>Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">GUILLAUME</namePart><namePart type="family">SUAN</namePart><affiliation>Departement Sciences de la Terre, Laboratoire de Géologie de Lyon: Terre, Planètes, et Environnement, Université Claude‐Bernard‐Lyon I, Batîment Géode, 2 Rue Raphael Dubois, 69622 Villeurbanne Cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">WOLFGANG</namePart><namePart type="family">OSCHMANN</namePart><affiliation>Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, 60438 Frankfurt am Main, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2013-02</dateIssued><edition>Manuscript received 21 August 2011; revision accepted 31 May 2012</edition><copyrightDate encoding="w3cdtf">2013</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">8</extent><extent unit="tables">3</extent></physicalDescription><abstract lang="en">In order to constrain spatial variability in watermass conditions within the European Epicontinental Seaway prior to, during and after the Toarcian Oceanic Anoxic Event, carbon (δ13Cbel, δ13Ccarb) and oxygen (δ18Obel, δ18Ocarb) isotope records were obtained from three sections in the Grands Causses Basin (southern France). These data were then compared with similar records along a north–south transect across the European Epicontinental Seaway. As the conclusions reached here strongly depend on the reliability of belemnite calcites as archives of palaeoceanographic changes, an attempt was made to improve the understanding of isotope signals recorded in belemnite calcite. Intra‐rostral carbon and oxygen‐isotope data from six belemnite specimens belonging to the genus Passaloteuthis were collected. Intra‐rostral carbon‐isotopes are influenced by vital effects, whereas oxygen‐isotopes reflect relative changes in temperature and salinity. Palaeotemperatures calculated from δ18Obel‐isotope records from the Grands Causses Basin confirm relatively low temperatures throughout the Late Pliensbachian. Similar cool water conditions have previously been shown in Germany, England, Spain and Portugal. A temperature increase of up to 6 °C is observed across the Pliensbachian–Toarcian boundary. A pronounced negative shift of at least −3‰ (Vienna‐Pee Dee Belemnite) is recorded in bulk carbonate carbon during the lower Harpoceras serpentinum zone, typical of the Toarcian Oceanic Anoxic Event. Before and after the Toarcian Oceanic Anoxic Event, a good correlation between δ13Ccarb and δ13Cbel exists, indicating well‐ventilated bottom‐waters and normal marine conditions. Instead, data for the Toarcian Oceanic Anoxic Event indicate the development of a strong north–south gradient in salinity stratification and surface‐water productivity for the Western Tethyan realm. This study thus lends further support to a pronounced regional overprint on carbon and oxygen‐isotope records in epicontinental seaways.</abstract><subject lang="en"><genre>keywords</genre><topic>Belemnites</topic><topic>carbon and oxygen stable isotopes</topic><topic>Early Jurassic</topic><topic>Oceanic Anoxic Event</topic><topic>palaeoceanography</topic><topic>Toarcian</topic></subject><relatedItem type="host"><titleInfo><title>Sedimentology</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0037-0746</identifier><identifier type="eISSN">1365-3091</identifier><identifier type="DOI">10.1111/(ISSN)1365-3091</identifier><identifier type="PublisherID">SED</identifier><part><date>2013</date><detail type="volume"><caption>vol.</caption><number>60</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>359</start><end>390</end><total>32</total></extent></part></relatedItem><identifier type="istex">7FC7A76A2A7FC58D14D0F7105925D1E7C7C8907B</identifier><identifier type="DOI">10.1111/j.1365-3091.2012.01344.x</identifier><identifier type="ArticleID">SED1344</identifier><accessCondition type="use and reproduction" contentType="copyright">© 2012 The Authors. 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