ThuliumV1, Main, Exploration, bibRecord, 002750

δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations

Identifieur interne : 002750 ( Main/Exploration ); précédent : 002749; suivant : 002751

δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations

Auteurs : Christophe Lécuyer [France] ; Patricia Grandjean [France] ; Jean-Alix Barrat [France] ; Jaak Nolvak [Estonie] ; Christian Emig [France] ; Florentin Paris [France] ; Michel Robardet [France]

Source :

Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 1998.

RBID : ISTEX:29B2F5F21EC1A9EEC47C8705B39A8C1385730033

Descripteurs français

Wicri :
- geographic : Estonie.
- topic : Phosphate.

English descriptors

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:

https://api.istex.fr/document/29B2F5F21EC1A9EEC47C8705B39A8C1385730033/fulltext/pdf

DOI: 10.1016/S0016-7037(98)00170-7

Affiliations:

Links toward previous steps (curation, corpus...)

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Le document en format XML

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<placeName><settlement type="city">Rennes</settlement>
<region type="region" nuts="2">Région Bretagne</region>
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<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>
<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>
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<term>Terrestrial source</term>
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<keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Estonie</term>
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<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>
<affiliations><list><country><li>Estonie</li>
<li>France</li>
</country>
<region><li>Auvergne-Rhône-Alpes</li>
<li>Provence-Alpes-Côte d'Azur</li>
<li>Rhône-Alpes</li>
<li>Région Bretagne</li>
</region>
<settlement><li>Grenoble</li>
<li>Lyon</li>
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<orgName><li>Université Joseph Fourier</li>
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<tree><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Lecuyer, Christophe" sort="Lecuyer, Christophe" uniqKey="Lecuyer C" first="Christophe" last="Lécuyer">Christophe Lécuyer</name>
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<name sortKey="Barrat, Jean Alix" sort="Barrat, Jean Alix" uniqKey="Barrat J" first="Jean-Alix" last="Barrat">Jean-Alix Barrat</name>
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<name sortKey="Grandjean, Patricia" sort="Grandjean, Patricia" uniqKey="Grandjean P" first="Patricia" last="Grandjean">Patricia Grandjean</name>
<name sortKey="Paris, Florentin" sort="Paris, Florentin" uniqKey="Paris F" first="Florentin" last="Paris">Florentin Paris</name>
<name sortKey="Robardet, Michel" sort="Robardet, Michel" uniqKey="Robardet M" first="Michel" last="Robardet">Michel Robardet</name>
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<country name="Estonie"><noRegion><name sortKey="Nolvak, Jaak" sort="Nolvak, Jaak" uniqKey="Nolvak J" first="Jaak" last="Nolvak">Jaak Nolvak</name>
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δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations

δ18O and REE contents of phosphatic brachiopods: a comparison between modern and lower Paleozoic populations

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri