Possible zircon UPb evidence for Pan-African granulite-facies metamorphism in the Mozambique belt of southern Tanzania
Identifieur interne : 001547 ( Main/Exploration ); précédent : 001546; suivant : 001548Possible zircon UPb evidence for Pan-African granulite-facies metamorphism in the Mozambique belt of southern Tanzania
Auteurs : J. J. M. M. M Coolen [Pays-Bas] ; H. N. A Priem [Pays-Bas] ; E. A. Th Verdurmen [Pays-Bas] ; R. H Verschure [Pays-Bas]Source :
- Precambrian Research [ 0301-9268 ] ; 1982.
Abstract
Four zircon fractions of garnet-bearing two-pyroxene granulite, from the Furua granulite complex of southern Tanzania, plot very close to concordia. A discordia yields a lower intercept at 652 ± 10 Ma, an age slightly higher than the RbSr whole-rock and mineral ages reported from the surrounding amphibolite-facies rocks. The UPb systematics indicate the presence of a very small amount of older (2–3 Ga) radiogenic lead. The zircon data may be interpreted as indicating an event of granulite-facies metamorphism during the Pan-African thermotectonic episode. This interpretation is at variance with current models postulating that the granulite complexes in the Mozambique belt are relicts of older, possibly Archaean events of metamorphism.
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DOI: 10.1016/0301-9268(82)90152-8
Affiliations:
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J. M. M. M" last="Coolen">J. J. M. M. M Coolen</name><affiliation wicri:level="1"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Instituut voor Aardwetenschappen, Vrije Universiteit, De Boelelaan 1085</wicri:regionArea><wicri:noRegion>De Boelelaan 1085</wicri:noRegion></affiliation></author><author><name sortKey="Priem, H N A" sort="Priem, H N A" uniqKey="Priem H" first="H. N. A" last="Priem">H. N. A Priem</name><affiliation wicri:level="1"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Z.W.O. Laboratorium voor Isotopen-Geologie, De Boelelaan 1085</wicri:regionArea><wicri:noRegion>De Boelelaan 1085</wicri:noRegion></affiliation></author><author><name sortKey="Verdurmen, E A Th" sort="Verdurmen, E A Th" uniqKey="Verdurmen E" first="E. A. Th" last="Verdurmen">E. A. Th Verdurmen</name><affiliation wicri:level="1"><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Z.W.O. 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Laboratorium voor Isotopen-Geologie, De Boelelaan 1085</wicri:regionArea><wicri:noRegion>De Boelelaan 1085</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Precambrian Research</title><title level="j" type="abbrev">PRECAM</title><idno type="ISSN">0301-9268</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1982">1982</date><biblScope unit="volume">17</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="31">31</biblScope><biblScope unit="page" to="40">40</biblScope></imprint><idno type="ISSN">0301-9268</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0301-9268</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Four zircon fractions of garnet-bearing two-pyroxene granulite, from the Furua granulite complex of southern Tanzania, plot very close to concordia. A discordia yields a lower intercept at 652 ± 10 Ma, an age slightly higher than the RbSr whole-rock and mineral ages reported from the surrounding amphibolite-facies rocks. The UPb systematics indicate the presence of a very small amount of older (2–3 Ga) radiogenic lead. The zircon data may be interpreted as indicating an event of granulite-facies metamorphism during the Pan-African thermotectonic episode. This interpretation is at variance with current models postulating that the granulite complexes in the Mozambique belt are relicts of older, possibly Archaean events of metamorphism.</div></front></TEI><affiliations><list><country><li>Pays-Bas</li></country></list><tree><country name="Pays-Bas"><noRegion><name sortKey="Coolen, J J M M M" sort="Coolen, J J M M M" uniqKey="Coolen J" first="J. J. M. M. M" last="Coolen">J. J. M. M. M Coolen</name></noRegion><name sortKey="Priem, H N A" sort="Priem, H N A" uniqKey="Priem H" first="H. N. A" last="Priem">H. N. A Priem</name><name sortKey="Verdurmen, E A Th" sort="Verdurmen, E A Th" uniqKey="Verdurmen E" first="E. A. Th" last="Verdurmen">E. A. Th Verdurmen</name><name sortKey="Verschure, R H" sort="Verschure, R H" uniqKey="Verschure R" first="R. H" last="Verschure">R. H Verschure</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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