The Os isotopic composition of Proterozoic upper mantle: evidence for chondritic upper mantle from the Outokumpu ophiolite, Finland
Identifieur interne : 000F80 ( Main/Exploration ); précédent : 000F79; suivant : 000F81The Os isotopic composition of Proterozoic upper mantle: evidence for chondritic upper mantle from the Outokumpu ophiolite, Finland
Auteurs : Richard J. Walker [États-Unis] ; Eero Hanski [États-Unis, Finlande] ; Jouni Vuollo [États-Unis, Finlande] ; Jussi Liipo [États-Unis, Finlande]Source :
- Earth and Planetary Science Letters [ 0012-821X ] ; 1996.
Abstract
Osmium isotopic data for chromite, gersdorffite and laurite separates from the upper mantle section of the 1.97 Ga Outokumpu ophiolite indicate that the mantle sources of these materials were broadly chondritic (within ± 2% of projected chondrite compositions) in their long-term ReOs isotopic evolution. This powerful isotopic constraint argues that other highly siderophile elements in the upper mantle also probably existed in chondritic relative proportions within the upper mantle, prior to the formation of the Outokumpu rocks. Late accretion of highly siderophile elements is the only process entirely consistent with this conclusion. While broadly chondritic, the podiform chromitites that were examined show evidence of at least two sources of Os. The primary magmatic source represented by a laurite grain has an initial γOs of − 1.6. Fluids that percolated through the rocks during alteration processes added more radiogenic Os (γOs > +0.4). The source of this radiogenic Os was likely either seawater, added during sepentinization, or continental crust, added during the obduction process. This study highlights the need for exercising great care in choosing the types of samples analyzed to reveal the isotopic composition of Os in ancient mantle reservoirs.
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DOI: 10.1016/0012-821X(96)00076-3
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Walker</name></author><author><name sortKey="Hanski, Eero" sort="Hanski, Eero" uniqKey="Hanski E" first="Eero" last="Hanski">Eero Hanski</name></author><author><name sortKey="Vuollo, Jouni" sort="Vuollo, Jouni" uniqKey="Vuollo J" first="Jouni" last="Vuollo">Jouni Vuollo</name></author><author><name sortKey="Liipo, Jussi" sort="Liipo, Jussi" uniqKey="Liipo J" first="Jussi" last="Liipo">Jussi Liipo</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:CCD46211264A6FC35018E38D35E93C2D52315771</idno><date when="1996" year="1996">1996</date><idno type="doi">10.1016/0012-821X(96)00076-3</idno><idno type="url">https://api.istex.fr/document/CCD46211264A6FC35018E38D35E93C2D52315771/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001432</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001432</idno><idno type="wicri:Area/Istex/Curation">000F21</idno><idno type="wicri:Area/Istex/Checkpoint">000821</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000821</idno><idno type="wicri:doubleKey">0012-821X:1996:Walker R:the:os:isotopic</idno><idno type="wicri:Area/Main/Merge">001019</idno><idno type="wicri:Area/Main/Curation">000F80</idno><idno type="wicri:Area/Main/Exploration">000F80</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">The Os isotopic composition of Proterozoic upper mantle: evidence for chondritic upper mantle from the Outokumpu ophiolite, Finland</title><author><name sortKey="Walker, Richard J" sort="Walker, Richard J" uniqKey="Walker R" first="Richard J." last="Walker">Richard J. 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Box 77, FIN-96101, Rovaniemi</wicri:regionArea><wicri:noRegion>Rovaniemi</wicri:noRegion></affiliation></author><author><name sortKey="Vuollo, Jouni" sort="Vuollo, Jouni" uniqKey="Vuollo J" first="Jouni" last="Vuollo">Jouni Vuollo</name><affiliation wicri:level="1"><country wicri:rule="url">États-Unis</country></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Finlande</country><wicri:regionArea>Department of Geology, University of Oulu, Linnanmaa, FIN-90570, Oulu</wicri:regionArea><wicri:noRegion>Oulu</wicri:noRegion></affiliation></author><author><name sortKey="Liipo, Jussi" sort="Liipo, Jussi" uniqKey="Liipo J" first="Jussi" last="Liipo">Jussi Liipo</name><affiliation wicri:level="1"><country wicri:rule="url">États-Unis</country></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Finlande</country><wicri:regionArea>Outokumpu Research Oy, Geoanalytical Laboratory, P.O. Box 74, FIN-83501, Outokumpu</wicri:regionArea><wicri:noRegion>Outokumpu</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Earth and Planetary Science Letters</title><title level="j" type="abbrev">EPSL</title><idno type="ISSN">0012-821X</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1996">1996</date><biblScope unit="volume">141</biblScope><biblScope unit="issue">1–4</biblScope><biblScope unit="page" from="161">161</biblScope><biblScope unit="page" to="173">173</biblScope></imprint><idno type="ISSN">0012-821X</idno></series><idno type="istex">CCD46211264A6FC35018E38D35E93C2D52315771</idno><idno type="DOI">10.1016/0012-821X(96)00076-3</idno><idno type="PII">0012-821X(96)00076-3</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0012-821X</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Osmium isotopic data for chromite, gersdorffite and laurite separates from the upper mantle section of the 1.97 Ga Outokumpu ophiolite indicate that the mantle sources of these materials were broadly chondritic (within ± 2% of projected chondrite compositions) in their long-term ReOs isotopic evolution. This powerful isotopic constraint argues that other highly siderophile elements in the upper mantle also probably existed in chondritic relative proportions within the upper mantle, prior to the formation of the Outokumpu rocks. Late accretion of highly siderophile elements is the only process entirely consistent with this conclusion. While broadly chondritic, the podiform chromitites that were examined show evidence of at least two sources of Os. The primary magmatic source represented by a laurite grain has an initial γOs of − 1.6. Fluids that percolated through the rocks during alteration processes added more radiogenic Os (γOs > +0.4). The source of this radiogenic Os was likely either seawater, added during sepentinization, or continental crust, added during the obduction process. This study highlights the need for exercising great care in choosing the types of samples analyzed to reveal the isotopic composition of Os in ancient mantle reservoirs.</div></front></TEI><affiliations><list><country><li>Finlande</li><li>États-Unis</li></country><region><li>Maryland</li></region><settlement><li>College Park (Maryland)</li></settlement><orgName><li>Université du Maryland</li></orgName></list><tree><country name="États-Unis"><noRegion><name sortKey="Walker, Richard J" sort="Walker, Richard J" uniqKey="Walker R" first="Richard J." last="Walker">Richard J. 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