Origin of Phlogopite in Mantle Xenoliths from Kostal Lake, Wells Gray Park, British Columbia
Identifieur interne : 001256 ( Main/Exploration ); précédent : 001255; suivant : 001257Origin of Phlogopite in Mantle Xenoliths from Kostal Lake, Wells Gray Park, British Columbia
Auteurs : Dante Canil [Canada] ; Christopher M. Scarfe [Canada]Source :
- Journal of Petrology [ 0022-3530 ] ; 1989-10.
Abstract
Phlogopite has been recognized for the first time in ultramafic xenoliths from the Canadian Cordillera. The phlogopite-bearing xenoliths are hosted in post-glacial basanitoid flows and ejecta of the Kostal Lake volcanic center, British Columbia. The xenolith assemblage consists of 60% cumulate-textured wehrlites, and 40% coarse-textured lherzolites, harzburgites, dunites, and olivine websterites. The phlogopite occurs: (1) as sub-euhedral grains along grain boundaries in dunite and lherzolite xenoliths; or (2) along orthopyroxene lamellae exsolved from intercumulus clinopyroxene in the wehrlite xenoliths; or (3) as grains hosted in 10–100 pm diameter fluid inclusions in clinopyroxene of all xenoliths. The phlogopites do not show any reaction relationships with other phases in any of the xenoliths studied. Phlogopites in a given xenolith have Mg/Mg + Fe2+ similar to that of coexisting olivine, clinopyroxene, and orthopyroxene. The partitioning of Fe and Mg between phlogopite and coexisting olivine and clinopyroxene is similar to that observed in other phlogopite-bearing mantle xenoliths, and in high-pressure melting experiments on rocks with similar bulk compositions. This indicates that the phlogopites in xenoliths from Kostal Lake have equilibrated with these coexisting phases. The occurrence of phlogopites in fluid inclusions containing Na, K, Cl, P, and S, suggests that incompatible element-enriched hydrous fluids/melts fluxed this part of the upper mantle beneath eastern British Columbia. Metasomatism of the upper mantle beneath Kostal Lake probably occurred prior to Quaternary alkaline magmatism (7550–400 B.P.) and after the initial volcanism which formed the wehrlite cumulates (3–5 Ma). Metasomatism caused overall oxidation of the upper mantle beneath this area but was not responsible for the anomalously Fe-rich nature of some xenoliths from the Kostal Lake eruptive center.
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DOI: 10.1093/petrology/30.5.1159
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Scarfe</name><affiliation wicri:level="1"><country>Canada</country><wicri:regionArea>Experimental Petrology Laboratory, Department of Geology, University of Alberta, Edmonton</wicri:regionArea><wicri:noRegion>Edmonton</wicri:noRegion></affiliation><affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Petrology</title><idno type="ISSN">0022-3530</idno><idno type="eISSN">1460-2415</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="1989-10">1989-10</date><biblScope unit="volume">30</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="1159">1159</biblScope><biblScope unit="page" to="1179">1179</biblScope></imprint><idno type="ISSN">0022-3530</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-3530</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">Phlogopite has been recognized for the first time in ultramafic xenoliths from the Canadian Cordillera. The phlogopite-bearing xenoliths are hosted in post-glacial basanitoid flows and ejecta of the Kostal Lake volcanic center, British Columbia. The xenolith assemblage consists of 60% cumulate-textured wehrlites, and 40% coarse-textured lherzolites, harzburgites, dunites, and olivine websterites. The phlogopite occurs: (1) as sub-euhedral grains along grain boundaries in dunite and lherzolite xenoliths; or (2) along orthopyroxene lamellae exsolved from intercumulus clinopyroxene in the wehrlite xenoliths; or (3) as grains hosted in 10–100 pm diameter fluid inclusions in clinopyroxene of all xenoliths. The phlogopites do not show any reaction relationships with other phases in any of the xenoliths studied. Phlogopites in a given xenolith have Mg/Mg + Fe2+ similar to that of coexisting olivine, clinopyroxene, and orthopyroxene. The partitioning of Fe and Mg between phlogopite and coexisting olivine and clinopyroxene is similar to that observed in other phlogopite-bearing mantle xenoliths, and in high-pressure melting experiments on rocks with similar bulk compositions. This indicates that the phlogopites in xenoliths from Kostal Lake have equilibrated with these coexisting phases. The occurrence of phlogopites in fluid inclusions containing Na, K, Cl, P, and S, suggests that incompatible element-enriched hydrous fluids/melts fluxed this part of the upper mantle beneath eastern British Columbia. Metasomatism of the upper mantle beneath Kostal Lake probably occurred prior to Quaternary alkaline magmatism (7550–400 B.P.) and after the initial volcanism which formed the wehrlite cumulates (3–5 Ma). Metasomatism caused overall oxidation of the upper mantle beneath this area but was not responsible for the anomalously Fe-rich nature of some xenoliths from the Kostal Lake eruptive center.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Canil, Dante" sort="Canil, Dante" uniqKey="Canil D" first="Dante" last="Canil">Dante Canil</name></noRegion><name sortKey="Scarfe, Christopher M" sort="Scarfe, Christopher M" uniqKey="Scarfe C" first="Christopher M." last="Scarfe">Christopher M. Scarfe</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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