Rare earth element redistribution and fractionation during secondary mineral formation: examples from reef carbonate karst (Jebel Stah, Tunisia) and from oceanic basalts (site 417A, Northern Atlantic)
Identifieur interne : 000465 ( France/Analysis ); précédent : 000464; suivant : 000466Rare earth element redistribution and fractionation during secondary mineral formation: examples from reef carbonate karst (Jebel Stah, Tunisia) and from oceanic basalts (site 417A, Northern Atlantic)
Auteurs : S. Tlig [France]Source :
- Journal of African Earth Sciences [ 0899-5362 ] ; 1991.
Abstract
Rare earth element (REE) distributions of fluorite-carbonate deposits from Northern Tunisia (Jebel Stah) and submarine alteration products of oceanic basalts from the Northern Atlantic (site 417A, D.S.D.P., Leg 51–53) were studied. The REE distributions of secondary minerals infilling karst at the Jebel Stah clearly illustrate the mobility and fractionation of the group. Calcite concentrates the highest amounts of REE (102 orders of higher magnitude) and is heavy REE enriched, whereas fluorite has the lower values and shows heavy but clearly medium REE enrichment. These fractionation and distributions are thought to be due to the effects of carbonate and/or fluoride complexes on the REE behaviour during the formation of secondary minerals. Celadonite-nontronite, saponite and Fe-oxyhydroxides formed early during submarine alteration, exhibit REE contents and distributions always similar to those of parental basalts, although they gained Ce and thus present positive Ce anomalies. Beidellites of the intermediary alteration stages show great heavy REE depleted REE curves and this is apparently due to chemical modifications where the increase of the CO2 partial pressure and REE-carbonate complex caused losses of the heavy REE relative to lighter members of the group. Thereafter, heavy REE complexes were probably released later along with the diminution of the CO2 partial pressure and precipitation of calcite and analcite and thus the heavy REE were accumulated in minerals of the latest stages. These fractionation and distributions of the REE during the secondary formation of minerals in karst and during the submarine alteration of basalts are thought to be due to effects of carbonate and/or fluoride complexes on the REE behaviour in the milieu.
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DOI: 10.1016/0899-5362(91)90002-G
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Tlig</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Groupe des Sciences de la Terre, Laboratoire de Pierre Süe, Bât. 37, CEN-Saclay, 91000 Gif sur Yvette</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Gif sur Yvette</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of African Earth Sciences</title><title level="j" type="abbrev">AESOLD</title><idno type="ISSN">0899-5362</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1991">1991</date><biblScope unit="volume">13</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="173">173</biblScope><biblScope unit="page" to="182">182</biblScope></imprint><idno type="ISSN">0899-5362</idno></series><idno type="istex">10DEFEA377C7F019E6864232DEE5E38E27997C37</idno><idno type="DOI">10.1016/0899-5362(91)90002-G</idno><idno type="PII">0899-5362(91)90002-G</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0899-5362</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Rare earth element (REE) distributions of fluorite-carbonate deposits from Northern Tunisia (Jebel Stah) and submarine alteration products of oceanic basalts from the Northern Atlantic (site 417A, D.S.D.P., Leg 51–53) were studied. The REE distributions of secondary minerals infilling karst at the Jebel Stah clearly illustrate the mobility and fractionation of the group. Calcite concentrates the highest amounts of REE (102 orders of higher magnitude) and is heavy REE enriched, whereas fluorite has the lower values and shows heavy but clearly medium REE enrichment. These fractionation and distributions are thought to be due to the effects of carbonate and/or fluoride complexes on the REE behaviour during the formation of secondary minerals. Celadonite-nontronite, saponite and Fe-oxyhydroxides formed early during submarine alteration, exhibit REE contents and distributions always similar to those of parental basalts, although they gained Ce and thus present positive Ce anomalies. Beidellites of the intermediary alteration stages show great heavy REE depleted REE curves and this is apparently due to chemical modifications where the increase of the CO2 partial pressure and REE-carbonate complex caused losses of the heavy REE relative to lighter members of the group. Thereafter, heavy REE complexes were probably released later along with the diminution of the CO2 partial pressure and precipitation of calcite and analcite and thus the heavy REE were accumulated in minerals of the latest stages. These fractionation and distributions of the REE during the secondary formation of minerals in karst and during the submarine alteration of basalts are thought to be due to effects of carbonate and/or fluoride complexes on the REE behaviour in the milieu.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Gif sur Yvette</li></settlement></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Tlig, S" sort="Tlig, S" uniqKey="Tlig S" first="S." last="Tlig">S. Tlig</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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