δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations
Identifieur interne : 000922 ( Istex/Corpus ); précédent : 000921; suivant : 000923δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations
Auteurs : Christophe Lécuyer ; Patricia Grandjean ; Jean-Alix Barrat ; Jaak Nolvak ; Christian Emig ; Florentin Paris ; Michel RobardetSource :
- Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1998.
English descriptors
- KwdEn :
- Ambient seawater, Anomaly, Apatite, Baltic area, Baltic shield, Biogenic, Biogenic apatite, Biogenic apatites, Brachiopod, Brachiopod samples, Brachiopod shells, Caledonia, Cambrian, Cambrian samples, Carbon isotope ratios, Carbonate, Careful examination, Costa rica, Diagenetic alteration, Earth planet, Ecole normale superieure, Elsevier science, Enrichment factor, Estonia, Estonian acad, Excursion guidebook, Extant lingulides, Fossil, Fossil brachiopods, Fossil linguloid samples, Fossil linguloids, Geol, Inarticulate brachiopods, Initial patterns, Isotope, Isotopic, Isotopic equilibrium, Kallavare formation, Lecuyer, Lingula anatina, Lingula specimens, Lingulide, Lingulide shells, Lingulides, Linguloid, Linguloid shell, Linguloids, Lower ordovician, Lower ordovician linguloids, Lower paleozoic, Lower paleozoic linguloids, Marine chemistry, Northern estonia, Northwestern russia, Ordovician, Ordovician linguloids, Oxygen isotope analysis, Oxygen isotope composition, Oxygen isotope compositions, Oxygen isotope disequilibria, Oxygen isotope ratios, Oxygenated marine waters, Palaeozoic palaeogeography, Paleozoic, Petersburg district, Phosphate, Phosphate component, Phosphatic, Phosphatic brachiopods, Phosphorite, Rare earth element concentrations, Rare earth element patterns, Rare earth elements, Seawater, Secondary apatite, Silver phosphate, Stable isotope compositions, Stable isotopes, Structural carbonate, Terrestrial source.
- Teeft :
- Ambient seawater, Anomaly, Apatite, Baltic area, Baltic shield, Biogenic, Biogenic apatite, Biogenic apatites, Brachiopod, Brachiopod samples, Brachiopod shells, Caledonia, Cambrian, Cambrian samples, Carbon isotope ratios, Carbonate, Careful examination, Costa rica, Diagenetic alteration, Earth planet, Ecole normale superieure, Elsevier science, Enrichment factor, Estonia, Estonian acad, Excursion guidebook, Extant lingulides, Fossil, Fossil brachiopods, Fossil linguloid samples, Fossil linguloids, Geol, Inarticulate brachiopods, Initial patterns, Isotope, Isotopic, Isotopic equilibrium, Kallavare formation, Lecuyer, Lingula anatina, Lingula specimens, Lingulide, Lingulide shells, Lingulides, Linguloid, Linguloid shell, Linguloids, Lower ordovician, Lower ordovician linguloids, Lower paleozoic, Lower paleozoic linguloids, Marine chemistry, Northern estonia, Northwestern russia, Ordovician, Ordovician linguloids, Oxygen isotope analysis, Oxygen isotope composition, Oxygen isotope compositions, Oxygen isotope disequilibria, Oxygen isotope ratios, Oxygenated marine waters, Palaeozoic palaeogeography, Paleozoic, Petersburg district, Phosphate, Phosphate component, Phosphatic, Phosphatic brachiopods, Phosphorite, Rare earth element concentrations, Rare earth element patterns, Rare earth elements, Seawater, Secondary apatite, Silver phosphate, Stable isotope compositions, Stable isotopes, Structural carbonate, Terrestrial source.
Abstract
Abstract: δ18O values of both carbonate (18.7–25.1‰) and phosphate (15.1–16.7‰) components of the francolite from the fossil brachiopod shells are interpreted as the result of a partial resetting of pristine isotopic compositions. The similarity of hat-shape REE patterns of some lower Ordovician linguloids with those of extant littoral specimens suggests the preservation of a 500 Myr-old record of REE marine chemistry. In agreement with the known paleogeography, the phosphatic brachiopods have been deposited in a coastal environment under shallow and oxygenated marine waters. However, the contents and distribution of REE in some strongly altered brachiopod shells reveal an alteration of the original negative Ce anomalies and both Nd and Sm enrichments that transformed the initial hat-shape patterns of linguloids into strongly convex or bell-shape patterns.
Url:
DOI: 10.1016/S0016-7037(98)00170-7
Links to Exploration step
ISTEX:29B2F5F21EC1A9EEC47C8705B39A8C1385730033Le document en format XML
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equilibrium</term><term>Kallavare formation</term><term>Lecuyer</term><term>Lingula anatina</term><term>Lingula specimens</term><term>Lingulide</term><term>Lingulide shells</term><term>Lingulides</term><term>Linguloid</term><term>Linguloid shell</term><term>Linguloids</term><term>Lower ordovician</term><term>Lower ordovician linguloids</term><term>Lower paleozoic</term><term>Lower paleozoic linguloids</term><term>Marine chemistry</term><term>Northern estonia</term><term>Northwestern russia</term><term>Ordovician</term><term>Ordovician linguloids</term><term>Oxygen isotope analysis</term><term>Oxygen isotope composition</term><term>Oxygen isotope compositions</term><term>Oxygen isotope disequilibria</term><term>Oxygen isotope ratios</term><term>Oxygenated marine waters</term><term>Palaeozoic palaeogeography</term><term>Paleozoic</term><term>Petersburg district</term><term>Phosphate</term><term>Phosphate component</term><term>Phosphatic</term><term>Phosphatic brachiopods</term><term>Phosphorite</term><term>Rare earth element concentrations</term><term>Rare earth element patterns</term><term>Rare earth elements</term><term>Seawater</term><term>Secondary apatite</term><term>Silver phosphate</term><term>Stable isotope compositions</term><term>Stable isotopes</term><term>Structural carbonate</term><term>Terrestrial source</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Ambient seawater</term><term>Anomaly</term><term>Apatite</term><term>Baltic area</term><term>Baltic shield</term><term>Biogenic</term><term>Biogenic apatite</term><term>Biogenic apatites</term><term>Brachiopod</term><term>Brachiopod samples</term><term>Brachiopod shells</term><term>Caledonia</term><term>Cambrian</term><term>Cambrian samples</term><term>Carbon isotope ratios</term><term>Carbonate</term><term>Careful examination</term><term>Costa rica</term><term>Diagenetic alteration</term><term>Earth planet</term><term>Ecole normale superieure</term><term>Elsevier science</term><term>Enrichment factor</term><term>Estonia</term><term>Estonian acad</term><term>Excursion guidebook</term><term>Extant lingulides</term><term>Fossil</term><term>Fossil brachiopods</term><term>Fossil linguloid samples</term><term>Fossil linguloids</term><term>Geol</term><term>Inarticulate brachiopods</term><term>Initial patterns</term><term>Isotope</term><term>Isotopic</term><term>Isotopic equilibrium</term><term>Kallavare formation</term><term>Lecuyer</term><term>Lingula anatina</term><term>Lingula specimens</term><term>Lingulide</term><term>Lingulide shells</term><term>Lingulides</term><term>Linguloid</term><term>Linguloid shell</term><term>Linguloids</term><term>Lower ordovician</term><term>Lower ordovician linguloids</term><term>Lower paleozoic</term><term>Lower paleozoic linguloids</term><term>Marine chemistry</term><term>Northern estonia</term><term>Northwestern russia</term><term>Ordovician</term><term>Ordovician linguloids</term><term>Oxygen isotope analysis</term><term>Oxygen isotope composition</term><term>Oxygen isotope compositions</term><term>Oxygen isotope disequilibria</term><term>Oxygen isotope ratios</term><term>Oxygenated marine waters</term><term>Palaeozoic palaeogeography</term><term>Paleozoic</term><term>Petersburg district</term><term>Phosphate</term><term>Phosphate component</term><term>Phosphatic</term><term>Phosphatic brachiopods</term><term>Phosphorite</term><term>Rare earth element concentrations</term><term>Rare earth element patterns</term><term>Rare earth elements</term><term>Seawater</term><term>Secondary apatite</term><term>Silver phosphate</term><term>Stable isotope compositions</term><term>Stable isotopes</term><term>Structural carbonate</term><term>Terrestrial source</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: δ18O values of both carbonate (18.7–25.1‰) and phosphate (15.1–16.7‰) components of the francolite from the fossil brachiopod shells are interpreted as the result of a partial resetting of pristine isotopic compositions. The similarity of hat-shape REE patterns of some lower Ordovician linguloids with those of extant littoral specimens suggests the preservation of a 500 Myr-old record of REE marine chemistry. In agreement with the known paleogeography, the phosphatic brachiopods have been deposited in a coastal environment under shallow and oxygenated marine waters. However, the contents and distribution of REE in some strongly altered brachiopod shells reveal an alteration of the original negative Ce anomalies and both Nd and Sm enrichments that transformed the initial hat-shape patterns of linguloids into strongly convex or bell-shape patterns.</div></front></TEI><istex><corpusName>elsevier</corpusName><keywords><teeft><json:string>isotope</json:string><json:string>fossil</json:string><json:string>linguloids</json:string><json:string>brachiopod</json:string><json:string>carbonate</json:string><json:string>paleozoic</json:string><json:string>ordovician</json:string><json:string>apatite</json:string><json:string>estonia</json:string><json:string>lingulides</json:string><json:string>fossil linguloids</json:string><json:string>lecuyer</json:string><json:string>phosphatic</json:string><json:string>cambrian</json:string><json:string>lingulide</json:string><json:string>linguloid</json:string><json:string>seawater</json:string><json:string>biogenic</json:string><json:string>caledonia</json:string><json:string>rare earth elements</json:string><json:string>geol</json:string><json:string>phosphorite</json:string><json:string>earth planet</json:string><json:string>lower paleozoic linguloids</json:string><json:string>anomaly</json:string><json:string>baltic area</json:string><json:string>structural carbonate</json:string><json:string>silver phosphate</json:string><json:string>kallavare formation</json:string><json:string>biogenic apatites</json:string><json:string>phosphatic brachiopods</json:string><json:string>stable isotope compositions</json:string><json:string>petersburg district</json:string><json:string>diagenetic alteration</json:string><json:string>stable isotopes</json:string><json:string>lingula anatina</json:string><json:string>northwestern russia</json:string><json:string>lower ordovician linguloids</json:string><json:string>oxygen isotope compositions</json:string><json:string>estonian acad</json:string><json:string>extant lingulides</json:string><json:string>secondary apatite</json:string><json:string>isotopic equilibrium</json:string><json:string>oxygen isotope composition</json:string><json:string>phosphate component</json:string><json:string>rare earth element concentrations</json:string><json:string>costa rica</json:string><json:string>phosphate</json:string><json:string>elsevier science</json:string><json:string>brachiopod samples</json:string><json:string>lower paleozoic</json:string><json:string>carbon isotope ratios</json:string><json:string>inarticulate brachiopods</json:string><json:string>lingulide shells</json:string><json:string>cambrian samples</json:string><json:string>fossil linguloid samples</json:string><json:string>oxygen isotope ratios</json:string><json:string>northern estonia</json:string><json:string>terrestrial source</json:string><json:string>enrichment factor</json:string><json:string>ambient seawater</json:string><json:string>ordovician linguloids</json:string><json:string>linguloid shell</json:string><json:string>rare earth element patterns</json:string><json:string>marine chemistry</json:string><json:string>oxygenated marine waters</json:string><json:string>lingula specimens</json:string><json:string>palaeozoic palaeogeography</json:string><json:string>careful examination</json:string><json:string>brachiopod shells</json:string><json:string>ecole normale superieure</json:string><json:string>fossil brachiopods</json:string><json:string>biogenic apatite</json:string><json:string>oxygen isotope disequilibria</json:string><json:string>baltic shield</json:string><json:string>lower ordovician</json:string><json:string>oxygen isotope analysis</json:string><json:string>initial patterns</json:string><json:string>excursion guidebook</json:string><json:string>isotopic</json:string></teeft></keywords><author><json:item><name>Christophe Lécuyer</name><affiliations><json:string>Laboratoire de Sciences de la Terre, CNRS-UMR 5570, Ecole Normale Supérieure de Lyon, 69364 Lyon cedex 07, France</json:string></affiliations></json:item><json:item><name>Patricia Grandjean</name><affiliations><json:string>Laboratoire de Sciences de la Terre, CNRS-UMR 5570, Ecole Normale Supérieure de Lyon, 69364 Lyon cedex 07, France</json:string></affiliations></json:item><json:item><name>Jean-Alix Barrat</name><affiliations><json:string>Université Joseph Fourier, UFR de Géologie, LGCA (UPRES associée au CNRS n°5025), 38031 Grenoble Cedex, France</json:string></affiliations></json:item><json:item><name>Jaak Nolvak</name><affiliations><json:string>Estonian Academy of Sciences, Institute of Geology, EE - 0105 Tallinn, Estonia</json:string></affiliations></json:item><json:item><name>Christian Emig</name><affiliations><json:string>CNRS-UMR 6540, Centre d’Océanologie de Marseille, Station Marine d’Endoume, 13007 Marseille, France</json:string></affiliations></json:item><json:item><name>Florentin Paris</name><affiliations><json:string>Géosciences Rennes, CNRS-UPR 4661, Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France</json:string></affiliations></json:item><json:item><name>Michel Robardet</name><affiliations><json:string>Géosciences Rennes, CNRS-UPR 4661, Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France</json:string></affiliations></json:item></author><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>δ18O values of both carbonate (18.7–25.1‰) and phosphate (15.1–16.7‰) components of the francolite from the fossil brachiopod shells are interpreted as the result of a partial resetting of pristine isotopic compositions. The similarity of hat-shape REE patterns of some lower Ordovician linguloids with those of extant littoral specimens suggests the preservation of a 500 Myr-old record of REE marine chemistry. In agreement with the known paleogeography, the phosphatic brachiopods have been deposited in a coastal environment under shallow and oxygenated marine waters. However, the contents and distribution of REE in some strongly altered brachiopod shells reveal an alteration of the original negative Ce anomalies and both Nd and Sm enrichments that transformed the initial hat-shape patterns of linguloids into strongly convex or bell-shape patterns.</abstract><qualityIndicators><score>6.108</score><pdfVersion>1.2</pdfVersion><pdfPageSize>586 x 785 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>858</abstractCharCount><pdfWordCount>4620</pdfWordCount><pdfCharCount>28091</pdfCharCount><pdfPageCount>8</pdfPageCount><abstractWordCount>124</abstractWordCount></qualityIndicators><title>δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations</title><pii><json:string>S0016-7037(98)00170-7</json:string></pii><genre><json:string>research-article</json:string></genre><host><title>Geochimica et Cosmochimica Acta</title><language><json:string>unknown</json:string></language><publicationDate>1998</publicationDate><issn><json:string>0016-7037</json:string></issn><pii><json:string>S0016-7037(00)X0070-1</json:string></pii><volume>62</volume><issue>14</issue><pages><first>2429</first><last>2436</last></pages><genre><json:string>journal</json:string></genre></host><categories><wos><json:string>science</json:string><json:string>geochemistry & geophysics</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>geochemistry & geophysics</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>genetique des eucaryotes. evolution biologique et moleculaire</json:string></inist></categories><publicationDate>1998</publicationDate><copyrightDate>1998</copyrightDate><doi><json:string>10.1016/S0016-7037(98)00170-7</json:string></doi><id>29B2F5F21EC1A9EEC47C8705B39A8C1385730033</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/29B2F5F21EC1A9EEC47C8705B39A8C1385730033/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/29B2F5F21EC1A9EEC47C8705B39A8C1385730033/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/29B2F5F21EC1A9EEC47C8705B39A8C1385730033/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>©1998 Elsevier Science Ltd</p></availability><date>1998</date></publicationStmt><notesStmt><note type="content">Section title: Original Articles</note><note type="content">Fig. 1: Simplified maps of the Baltic area with emphasis on the geographical distribution of Ordovician phosphorite deposits and location of studied linguloid brachiopods. A paleogeographic world map with the location of the Baltic Shield in a medium latitudinal position during the Lower Ordovician has been modified from Jurdy et al. (1995).</note><note type="content">Fig. 2: Rare earth element patterns of Lower Paleozoic linguloids from Estonia and northwestern Russia, and from modern lingulides from estuarine (thick line), lagoonal, and open sea (dash line) environments. Absolute concentrations in fossils are about one thousand times those of living specimens. Note the hat-shape patterns of fossils (except the bell-shape patterns of samples ES6 and ES7) very similar to those of living lingulides sampled along the littoral domains of Hawaii, New Caledonia, and Costa Rica (Atlantic side). Concentrations are normalized to the Post Archean Australian Average Shale (PAAS) defined by McLennan (1989).</note><note type="content">Fig. 3: (a) Variations in the δ18O values of the structural phosphate and carbonate components from the fossil linguloids. The line of oxygen isotope equilibrium between phosphate and carbonate from biogenic apatite (Iacumin et al., 1996) has been reported to show the oxygen isotope disequilibria recorded in the Lower Paleozoic fossils from the Baltic area. (b) Variations in the δ13C values as a function of the δ18O values of structural carbonate.</note><note type="content">Fig. 4: (La/Sm)N ratios vs. the sum of rare earth elements (a) and (Gd/Yb)N ratios vs. the Ce anomaly (ΩCe) (b) for extant lingulides (open diamonds) and Lower Paleozoic linguloids from the Baltic area (open circles). The gray area delimits the range of REE ratios measured in the living lingulide population.</note><note type="content">Table 1: Stable isotope compositions of phosphate and carbonate from living Lingula specimen and fossil linguloid samples from Cambrian and Lower Ordovician deposits of northern Estonia and northwestern Russia. The amount of CO2 measured during the reaction between the samples and the phosphoric acid yields estimates of CO3 wt% in the francolite tests. Similarly, the amount of silver phosphate precipitated after dissolution of the francolite was used to estimate the P2O5 wt%.</note><note type="content">Table 2: Rare earth element concentrations of fossil linguloids from Estonia and northwestern Russia, and Lingula specimens from Japan, Hawaii, New Caledonia, and Costa Rica. Lingula specimens from New Caledonia have been sampled in an estuary (Bay of Conception) and also within the external part of the lagoon located along the southwest coast of the island. Data have been normalized to the Post Archean Australian Shale (PAAS, McLennan, 1989). The Ce anomaly, ΩCe, is quantified by the term Ce/Ce∗, where Ce∗ is the expected Ce value for a smooth PAAS-normalized REE pattern. This Ce anomaly is calculated after the method described in Grandjean et al. (1987). ΩCe = [CeN/(LaN)1/2/(PrN)1/2] − 1.</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations</title><author xml:id="author-0000"><persName><forename type="first">Christophe</forename><surname>Lécuyer</surname></persName><affiliation>Laboratoire de Sciences de la Terre, CNRS-UMR 5570, Ecole Normale Supérieure de Lyon, 69364 Lyon cedex 07, France</affiliation></author><author xml:id="author-0001"><persName><forename type="first">Patricia</forename><surname>Grandjean</surname></persName><affiliation>Laboratoire de Sciences de la Terre, CNRS-UMR 5570, Ecole Normale Supérieure de Lyon, 69364 Lyon cedex 07, France</affiliation></author><author xml:id="author-0002"><persName><forename type="first">Jean-Alix</forename><surname>Barrat</surname></persName><note type="biography">Present address: Université d’Angers, Laboratoire de Géologie, 49045 Angers Cedex, France</note><affiliation>Present address: Université d’Angers, Laboratoire de Géologie, 49045 Angers Cedex, France</affiliation><affiliation>Université Joseph Fourier, UFR de Géologie, LGCA (UPRES associée au CNRS n°5025), 38031 Grenoble Cedex, France</affiliation></author><author xml:id="author-0003"><persName><forename type="first">Jaak</forename><surname>Nolvak</surname></persName><affiliation>Estonian Academy of Sciences, Institute of Geology, EE - 0105 Tallinn, Estonia</affiliation></author><author xml:id="author-0004"><persName><forename type="first">Christian</forename><surname>Emig</surname></persName><affiliation>CNRS-UMR 6540, Centre d’Océanologie de Marseille, Station Marine d’Endoume, 13007 Marseille, France</affiliation></author><author xml:id="author-0005"><persName><forename type="first">Florentin</forename><surname>Paris</surname></persName><affiliation>Géosciences Rennes, CNRS-UPR 4661, Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France</affiliation></author><author xml:id="author-0006"><persName><forename type="first">Michel</forename><surname>Robardet</surname></persName><affiliation>Géosciences Rennes, CNRS-UPR 4661, Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France</affiliation></author><idno type="istex">29B2F5F21EC1A9EEC47C8705B39A8C1385730033</idno><idno type="DOI">10.1016/S0016-7037(98)00170-7</idno><idno type="PII">S0016-7037(98)00170-7</idno></analytic><monogr><title level="j">Geochimica et Cosmochimica Acta</title><title level="j" type="abbrev">GCA</title><idno type="pISSN">0016-7037</idno><idno type="PII">S0016-7037(00)X0070-1</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1998"></date><biblScope unit="volume">62</biblScope><biblScope unit="issue">14</biblScope><biblScope unit="page" from="2429">2429</biblScope><biblScope unit="page" to="2436">2436</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1998</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>δ18O values of both carbonate (18.7–25.1‰) and phosphate (15.1–16.7‰) components of the francolite from the fossil brachiopod shells are interpreted as the result of a partial resetting of pristine isotopic compositions. The similarity of hat-shape REE patterns of some lower Ordovician linguloids with those of extant littoral specimens suggests the preservation of a 500 Myr-old record of REE marine chemistry. In agreement with the known paleogeography, the phosphatic brachiopods have been deposited in a coastal environment under shallow and oxygenated marine waters. However, the contents and distribution of REE in some strongly altered brachiopod shells reveal an alteration of the original negative Ce anomalies and both Nd and Sm enrichments that transformed the initial hat-shape patterns of linguloids into strongly convex or bell-shape patterns.</p></abstract></profileDesc><revisionDesc><change when="1998">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/29B2F5F21EC1A9EEC47C8705B39A8C1385730033/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: ce:floats; body; 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:entity SYSTEM="fx1" NDATA="IMAGE" name="FX1"></istex:entity><istex:entity SYSTEM="fx2" NDATA="IMAGE" name="FX2"></istex:entity><istex:entity SYSTEM="gr1" NDATA="IMAGE" name="GR1"></istex:entity><istex:entity SYSTEM="gr2" NDATA="IMAGE" name="GR2"></istex:entity><istex:entity SYSTEM="gr3" NDATA="IMAGE" name="GR3"></istex:entity><istex:entity SYSTEM="gr4" NDATA="IMAGE" name="GR4"></istex:entity></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla" xml:lang="en"><item-info><jid>GCA</jid><aid>1805</aid><ce:pii>S0016-7037(98)00170-7</ce:pii><ce:doi>10.1016/S0016-7037(98)00170-7</ce:doi><ce:copyright type="full-transfer" year="1998">Elsevier Science Ltd</ce:copyright></item-info><head><ce:dochead><ce:textfn>Original Articles</ce:textfn></ce:dochead><ce:title>δ<ce:sup>18</ce:sup>O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations</ce:title><ce:author-group><ce:author><ce:indexed-name>Lecuyer</ce:indexed-name><ce:given-name>Christophe</ce:given-name><ce:surname>Lécuyer</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Patricia</ce:given-name><ce:surname>Grandjean</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Jean-Alix</ce:given-name><ce:surname>Barrat</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>2</ce:sup></ce:cross-ref><ce:cross-ref refid="FN1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Jaak</ce:given-name><ce:surname>Nolvak</ce:surname><ce:cross-ref refid="AFF3"><ce:sup>3</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Christian</ce:given-name><ce:surname>Emig</ce:surname><ce:cross-ref refid="AFF4"><ce:sup>4</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Florentin</ce:given-name><ce:surname>Paris</ce:surname><ce:cross-ref refid="AFF5"><ce:sup>5</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Michel</ce:given-name><ce:surname>Robardet</ce:surname><ce:cross-ref refid="AFF5"><ce:sup>5</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>1</ce:label><ce:textfn>Laboratoire de Sciences de la Terre, CNRS-UMR 5570, Ecole Normale Supérieure de Lyon, 69364 Lyon cedex 07, France</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>2</ce:label><ce:textfn>Université Joseph Fourier, UFR de Géologie, LGCA (UPRES associée au CNRS n°5025), 38031 Grenoble Cedex, France</ce:textfn></ce:affiliation><ce:affiliation id="AFF3"><ce:label>3</ce:label><ce:textfn>Estonian Academy of Sciences, Institute of Geology, EE - 0105 Tallinn, Estonia</ce:textfn></ce:affiliation><ce:affiliation id="AFF4"><ce:label>4</ce:label><ce:textfn>CNRS-UMR 6540, Centre d’Océanologie de Marseille, Station Marine d’Endoume, 13007 Marseille, France</ce:textfn></ce:affiliation><ce:affiliation id="AFF5"><ce:label>5</ce:label><ce:textfn>Géosciences Rennes, CNRS-UPR 4661, Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France</ce:textfn></ce:affiliation><ce:footnote id="FN1"><ce:label>1</ce:label><ce:note-para>Present address: Université d’Angers, Laboratoire de Géologie, 49045 Angers Cedex, France</ce:note-para></ce:footnote></ce:author-group><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>δ<ce:sup>18</ce:sup>O values of both carbonate (18.7–25.1‰) and phosphate (15.1–16.7‰) components of the francolite from the fossil brachiopod shells are interpreted as the result of a partial resetting of pristine isotopic compositions. The similarity of hat-shape REE patterns of some lower Ordovician linguloids with those of extant littoral specimens suggests the preservation of a 500 Myr-old record of REE marine chemistry. In agreement with the known paleogeography, the phosphatic brachiopods have been deposited in a coastal environment under shallow and oxygenated marine waters. However, the contents and distribution of REE in some strongly altered brachiopod shells reveal an alteration of the original negative Ce anomalies and both Nd and Sm enrichments that transformed the initial hat-shape patterns of linguloids into strongly convex or bell-shape patterns.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>δ</title></titleInfo><name type="personal"><namePart type="given">Christophe</namePart><namePart type="family">Lécuyer</namePart><affiliation>Laboratoire de Sciences de la Terre, CNRS-UMR 5570, Ecole Normale Supérieure de Lyon, 69364 Lyon cedex 07, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Patricia</namePart><namePart type="family">Grandjean</namePart><affiliation>Laboratoire de Sciences de la Terre, CNRS-UMR 5570, Ecole Normale Supérieure de Lyon, 69364 Lyon cedex 07, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jean-Alix</namePart><namePart type="family">Barrat</namePart><affiliation>Université Joseph Fourier, UFR de Géologie, LGCA (UPRES associée au CNRS n°5025), 38031 Grenoble Cedex, France</affiliation><description>Present address: Université d’Angers, Laboratoire de Géologie, 49045 Angers Cedex, France</description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jaak</namePart><namePart type="family">Nolvak</namePart><affiliation>Estonian Academy of Sciences, Institute of Geology, EE - 0105 Tallinn, Estonia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Christian</namePart><namePart type="family">Emig</namePart><affiliation>CNRS-UMR 6540, Centre d’Océanologie de Marseille, Station Marine d’Endoume, 13007 Marseille, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Florentin</namePart><namePart type="family">Paris</namePart><affiliation>Géosciences Rennes, CNRS-UPR 4661, Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Michel</namePart><namePart type="family">Robardet</namePart><affiliation>Géosciences Rennes, CNRS-UPR 4661, Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1998</dateIssued><copyrightDate encoding="w3cdtf">1998</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><abstract lang="en">Abstract: δ18O values of both carbonate (18.7–25.1‰) and phosphate (15.1–16.7‰) components of the francolite from the fossil brachiopod shells are interpreted as the result of a partial resetting of pristine isotopic compositions. The similarity of hat-shape REE patterns of some lower Ordovician linguloids with those of extant littoral specimens suggests the preservation of a 500 Myr-old record of REE marine chemistry. In agreement with the known paleogeography, the phosphatic brachiopods have been deposited in a coastal environment under shallow and oxygenated marine waters. However, the contents and distribution of REE in some strongly altered brachiopod shells reveal an alteration of the original negative Ce anomalies and both Nd and Sm enrichments that transformed the initial hat-shape patterns of linguloids into strongly convex or bell-shape patterns.</abstract><note type="content">Section title: Original Articles</note><note type="content">Fig. 1: Simplified maps of the Baltic area with emphasis on the geographical distribution of Ordovician phosphorite deposits and location of studied linguloid brachiopods. A paleogeographic world map with the location of the Baltic Shield in a medium latitudinal position during the Lower Ordovician has been modified from Jurdy et al. (1995).</note><note type="content">Fig. 2: Rare earth element patterns of Lower Paleozoic linguloids from Estonia and northwestern Russia, and from modern lingulides from estuarine (thick line), lagoonal, and open sea (dash line) environments. Absolute concentrations in fossils are about one thousand times those of living specimens. Note the hat-shape patterns of fossils (except the bell-shape patterns of samples ES6 and ES7) very similar to those of living lingulides sampled along the littoral domains of Hawaii, New Caledonia, and Costa Rica (Atlantic side). Concentrations are normalized to the Post Archean Australian Average Shale (PAAS) defined by McLennan (1989).</note><note type="content">Fig. 3: (a) Variations in the δ18O values of the structural phosphate and carbonate components from the fossil linguloids. The line of oxygen isotope equilibrium between phosphate and carbonate from biogenic apatite (Iacumin et al., 1996) has been reported to show the oxygen isotope disequilibria recorded in the Lower Paleozoic fossils from the Baltic area. (b) Variations in the δ13C values as a function of the δ18O values of structural carbonate.</note><note type="content">Fig. 4: (La/Sm)N ratios vs. the sum of rare earth elements (a) and (Gd/Yb)N ratios vs. the Ce anomaly (ΩCe) (b) for extant lingulides (open diamonds) and Lower Paleozoic linguloids from the Baltic area (open circles). The gray area delimits the range of REE ratios measured in the living lingulide population.</note><note type="content">Table 1: Stable isotope compositions of phosphate and carbonate from living Lingula specimen and fossil linguloid samples from Cambrian and Lower Ordovician deposits of northern Estonia and northwestern Russia. The amount of CO2 measured during the reaction between the samples and the phosphoric acid yields estimates of CO3 wt% in the francolite tests. Similarly, the amount of silver phosphate precipitated after dissolution of the francolite was used to estimate the P2O5 wt%.</note><note type="content">Table 2: Rare earth element concentrations of fossil linguloids from Estonia and northwestern Russia, and Lingula specimens from Japan, Hawaii, New Caledonia, and Costa Rica. Lingula specimens from New Caledonia have been sampled in an estuary (Bay of Conception) and also within the external part of the lagoon located along the southwest coast of the island. Data have been normalized to the Post Archean Australian Shale (PAAS, McLennan, 1989). The Ce anomaly, ΩCe, is quantified by the term Ce/Ce∗, where Ce∗ is the expected Ce value for a smooth PAAS-normalized REE pattern. This Ce anomaly is calculated after the method described in Grandjean et al. (1987). ΩCe = [CeN/(LaN)1/2/(PrN)1/2] − 1.</note><relatedItem type="host"><titleInfo><title>Geochimica et Cosmochimica Acta</title></titleInfo><titleInfo type="abbreviated"><title>GCA</title></titleInfo><genre type="journal" authority="ISTEX" authorityURI="https://publication-type.data.istex.fr" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">199807</dateIssued></originInfo><identifier type="ISSN">0016-7037</identifier><identifier type="PII">S0016-7037(00)X0070-1</identifier><part><date>199807</date><detail type="volume"><number>62</number><caption>vol.</caption></detail><detail type="issue"><number>14</number><caption>no.</caption></detail><extent unit="issue-pages"><start>2409</start><end>2584</end></extent><extent unit="pages"><start>2429</start><end>2436</end></extent></part></relatedItem><identifier type="istex">29B2F5F21EC1A9EEC47C8705B39A8C1385730033</identifier><identifier type="ark">ark:/67375/6H6-NN15Q1RH-K</identifier><identifier type="DOI">10.1016/S0016-7037(98)00170-7</identifier><identifier type="PII">S0016-7037(98)00170-7</identifier><accessCondition type="use and reproduction" contentType="copyright">©1998 Elsevier Science Ltd</accessCondition><recordInfo><recordContentSource authority="ISTEX" authorityURI="https://loaded-corpus.data.istex.fr" valueURI="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-HKKZVM7B-M">elsevier</recordContentSource><recordOrigin>Elsevier Science Ltd, ©1998</recordOrigin></recordInfo></mods><json:item><extension>json</extension><original>false</original><mimetype>application/json</mimetype><uri>https://api.istex.fr/document/29B2F5F21EC1A9EEC47C8705B39A8C1385730033/metadata/json</uri></json:item></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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