A comparative study of the Rare Earth Element (REE) distributions within the Lower Cretaceous dolomites and limestones of Central Tunisia
Identifieur interne : 000E05 ( Istex/Corpus ); précédent : 000E04; suivant : 000E06A comparative study of the Rare Earth Element (REE) distributions within the Lower Cretaceous dolomites and limestones of Central Tunisia
Auteurs : Sa Md Tlig ; Ali M'RabetSource :
- Sedimentology [ 0037-0746 ] ; 1985-12.
Abstract
REE distribution, strontium content and oxygen isotopic composition have been studied in the Lower Cretaceous dolomites and their interbedded and/or parental limestones of Central Tunisia. Dolomites, as indicated by previous sedimentologic, geochemical and isotopic study, are different in origin. Environments of dolomite formation include: evaporitic sabkha, deep phreatic, karst and lacustrine. With the exception of the sabkha environment, dolomitizing fluids presumably have been essentially meteoric. The comparison between REE distributions in dolomites and limestones clearly suggests that the general shapes of the REE patterns are preserved during dolomitization. Nevertheless, the total REE amounts are somewhat lowered in dolomites comparatively to parental limestones. Moreover, within the dolomites, the total REE contents are positively correlated to the Sr and δ18O contents; thus indicating that the decrease in REE, Sr, and δ18O contents is related to a decrease in the salinity of dolomitizing fluids. In addition, dolomites associated with emergence surfaces (karst) are the most impoverished in REE. Furthermore, they are relatively enriched in light REE, indicating a more or less important fractionation with the REE distributions. This enrichment has been related to the influence of the inorganic complexes which favours the greatest solubility of the heavy REE in basic solution with respect to the lightest members of the REE group.
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DOI: 10.1111/j.1365-3091.1985.tb00739.x
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Dolomites, as indicated by previous sedimentologic, geochemical and isotopic study, are different in origin. Environments of dolomite formation include: evaporitic sabkha, deep phreatic, karst and lacustrine. With the exception of the sabkha environment, dolomitizing fluids presumably have been essentially meteoric. The comparison between REE distributions in dolomites and limestones clearly suggests that the general shapes of the REE patterns are preserved during dolomitization. Nevertheless, the total REE amounts are somewhat lowered in dolomites comparatively to parental limestones. Moreover, within the dolomites, the total REE contents are positively correlated to the Sr and δ18O contents; thus indicating that the decrease in REE, Sr, and δ18O contents is related to a decrease in the salinity of dolomitizing fluids. In addition, dolomites associated with emergence surfaces (karst) are the most impoverished in REE. Furthermore, they are relatively enriched in light REE, indicating a more or less important fractionation with the REE distributions. This enrichment has been related to the influence of the inorganic complexes which favours the greatest solubility of the heavy REE in basic solution with respect to the lightest members of the REE group.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>SAĪMD TLIG</name><affiliations><json:string>Laboratoires de Sédimentologie et Géochimie, Département des Sciences de la Terre, Faculté des Sciences de Tunis, Campus Universitaire, 1060‐Tunis, Tunisie</json:string></affiliations></json:item><json:item><name>ALI M'RABET</name><affiliations><json:string>Laboratoires de Sédimentologie et Géochimie, Département des Sciences de la Terre, Faculté des Sciences de Tunis, Campus Universitaire, 1060‐Tunis, Tunisie</json:string></affiliations></json:item></author><articleId><json:string>SED897</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>REE distribution, strontium content and oxygen isotopic composition have been studied in the Lower Cretaceous dolomites and their interbedded and/or parental limestones of Central Tunisia. 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Furthermore, they are relatively enriched in light REE, indicating a more or less important fractionation with the REE distributions. 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Dolomites, as indicated by previous sedimentologic, geochemical and isotopic study, are different in origin. Environments of dolomite formation include: evaporitic sabkha, deep phreatic, karst and lacustrine. With the exception of the sabkha environment, dolomitizing fluids presumably have been essentially meteoric. The comparison between REE distributions in dolomites and limestones clearly suggests that the general shapes of the REE patterns are preserved during dolomitization. Nevertheless, the total REE amounts are somewhat lowered in dolomites comparatively to parental limestones. Moreover, within the dolomites, the total REE contents are positively correlated to the Sr and δ<sup>18</sup>O contents; thus indicating that the decrease in REE, Sr, and δ<sup>18</sup>O contents is related to a decrease in the salinity of dolomitizing fluids. In addition, dolomites associated with emergence surfaces (karst) are the most impoverished in REE. Furthermore, they are relatively enriched in light REE, indicating a more or less important fractionation with the REE distributions. This enrichment has been related to the influence of the inorganic complexes which favours the greatest solubility of the heavy REE in basic solution with respect to the lightest members of the REE group.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>A comparative study of the Rare Earth Element (REE) distributions within the Lower Cretaceous dolomites and limestones of Central Tunisia</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>A comparative study of the Rare Earth Element (REE) distributions within the Lower Cretaceous dolomites and limestones of Central Tunisia</title></titleInfo><name type="personal"><namePart type="given">SAĪMD</namePart><namePart type="family">TLIG</namePart><affiliation>Laboratoires de Sédimentologie et Géochimie, Département des Sciences de la Terre, Faculté des Sciences de Tunis, Campus Universitaire, 1060‐Tunis, Tunisie</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">ALI</namePart><namePart type="family">M'RABET</namePart><affiliation>Laboratoires de Sédimentologie et Géochimie, Département des Sciences de la Terre, Faculté des Sciences de Tunis, Campus Universitaire, 1060‐Tunis, Tunisie</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">1985-12</dateIssued><edition>(Manuscript received 9 May 1984; revision received 11 April 1985)</edition><copyrightDate encoding="w3cdtf">1985</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="references">35</extent></physicalDescription><abstract lang="en">REE distribution, strontium content and oxygen isotopic composition have been studied in the Lower Cretaceous dolomites and their interbedded and/or parental limestones of Central Tunisia. Dolomites, as indicated by previous sedimentologic, geochemical and isotopic study, are different in origin. Environments of dolomite formation include: evaporitic sabkha, deep phreatic, karst and lacustrine. With the exception of the sabkha environment, dolomitizing fluids presumably have been essentially meteoric. The comparison between REE distributions in dolomites and limestones clearly suggests that the general shapes of the REE patterns are preserved during dolomitization. Nevertheless, the total REE amounts are somewhat lowered in dolomites comparatively to parental limestones. Moreover, within the dolomites, the total REE contents are positively correlated to the Sr and δ18O contents; thus indicating that the decrease in REE, Sr, and δ18O contents is related to a decrease in the salinity of dolomitizing fluids. In addition, dolomites associated with emergence surfaces (karst) are the most impoverished in REE. Furthermore, they are relatively enriched in light REE, indicating a more or less important fractionation with the REE distributions. This enrichment has been related to the influence of the inorganic complexes which favours the greatest solubility of the heavy REE in basic solution with respect to the lightest members of the REE group.</abstract><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>1985</date><detail type="volume"><caption>vol.</caption><number>32</number></detail><detail type="issue"><caption>no.</caption><number>6</number></detail><extent unit="pages"><start>897</start><end>907</end><total>11</total></extent></part></relatedItem><identifier type="istex">DCD108423D45569CBE251C5B41FEDE144DC9303E</identifier><identifier type="DOI">10.1111/j.1365-3091.1985.tb00739.x</identifier><identifier type="ArticleID">SED897</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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