AustralieFrV1, Main, Exploration, bibRecord, 00D701

Early Archaean component ( > 3.5 Ga) within a 3.05 Ga orthogneiss from northern Nigeria: UPb zircon evidence

Identifieur interne : 00D701 ( Main/Exploration ); précédent : 00D700; suivant : 00D702

Early Archaean component ( > 3.5 Ga) within a 3.05 Ga orthogneiss from northern Nigeria: UPb zircon evidence

Auteurs : O. Bruguier [France, Australie] ; S. Dada [Nigeria] ; J. R. Lancelot [France]

Source :

Earth and Planetary Science Letters [ 0012-821X ] ; 1994.

RBID : ISTEX:258DC79E2875D1EF94BFCD33CF0781F3AAFA1C04

Descripteurs français

Wicri :
- geographic : Nigeria.
- topic : Essence.

English descriptors

KwdEn :
- Abraded, Abraded grains, Archaean, Bruguier, Concordia, Concordia diagram, Contrib, Crust, Crustal, Data points, Discordia, Discordia line, Earth planet, Eburnean, Eburnean event, Emplacement, Euhedral, Euhedral zoning, Geochronology, Geological significance, Gneiss, Granodioritic, Granodioritic magma, Granodioritic orthogneiss, Igneous origin, Isotopic, Kaduna, Kaduna orthogneiss, Kibaran, Lancelot, Lett, Lower intercept, Magma, Magmatic, Magmatic corrosion, Metamorphic, Metamorphic event, Metamorphism, Mobile belt, Monazite, Multiple zircon growth, Nigeria, Nigerian, Nigerian basement, Northern nigeria, Orogeny, Orthogneiss, Petrol, Planetary science letters, Precambrian, Single monazite grain, Single zircon grains, Upper intercept, West africa, Zircon, Zircon fractions, Zircon grain, Zircon grains, Zircon population, Zircon populations, Zircon systems, Zircon type.
Teeft :
- Abraded, Abraded grains, Archaean, Bruguier, Concordia, Concordia diagram, Contrib, Crust, Crustal, Data points, Discordia, Discordia line, Earth planet, Eburnean, Eburnean event, Emplacement, Euhedral, Euhedral zoning, Geochronology, Geological significance, Gneiss, Granodioritic, Granodioritic magma, Granodioritic orthogneiss, Igneous origin, Isotopic, Kaduna, Kaduna orthogneiss, Kibaran, Lancelot, Lett, Lower intercept, Magma, Magmatic, Magmatic corrosion, Metamorphic, Metamorphic event, Metamorphism, Mobile belt, Monazite, Multiple zircon growth, Nigeria, Nigerian, Nigerian basement, Northern nigeria, Orogeny, Orthogneiss, Petrol, Planetary science letters, Precambrian, Single monazite grain, Single zircon grains, Upper intercept, West africa, Zircon, Zircon fractions, Zircon grain, Zircon grains, Zircon population, Zircon populations, Zircon systems, Zircon type.

Abstract

Abstract: Conventional UPb analyses on selected single zircon grains and on zircon fractions from a granodioritic orthogneiss at Kaduna (northern Nigeria) show that the Nigerian basement contains Archaean components that have not been recognized until now. A distinct U-rich zircon group records an age of 3040 ± 60 Ma, which is interpreted as the age of emplacement and crystallization of the granodioritic magma. The occurrence of a magmatic event at ca. 3000 Ma is confirmed by the addition of core-free abraded grains (3050 ± 23 Ma). These ages are identical to the less precise value (2980 ± 90 Ma) given by zircon fractions. These results also demonstrate that zircons underwent Pb loss during the Pan-African orogeny at 612 ± 23 Ma, which is well supported by an identical age on a single monazite grain (618 ± 8 Ma). Moreover, UPb analyses of abraded U-poor core-bearing crystals clearly identify the presence of source material of early Archaean age ( > 3500 Ma), the oldest age for crust initiating processes ever found in this area. In contrast to earlier RbSr geochronology no evidence for an Eburnean (2000 ± 200 Ma) or Kibaran (1100 ± 200 Ma) orogeny is present in the UPb systems of these zircons.

Url:

https://api.istex.fr/document/258DC79E2875D1EF94BFCD33CF0781F3AAFA1C04/fulltext/pdf

DOI: 10.1016/0012-821X(94)90208-9

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Istex, to step Corpus: 000737
to stream Istex, to step Curation: 000737
to stream Istex, to step Checkpoint: 002856
to stream Main, to step Merge: 00E914
to stream Main, to step Curation: 00D701

Le document en format XML

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<term>Bruguier</term>
<term>Concordia</term>
<term>Concordia diagram</term>
<term>Contrib</term>
<term>Crust</term>
<term>Crustal</term>
<term>Data points</term>
<term>Discordia</term>
<term>Discordia line</term>
<term>Earth planet</term>
<term>Eburnean</term>
<term>Eburnean event</term>
<term>Emplacement</term>
<term>Euhedral</term>
<term>Euhedral zoning</term>
<term>Geochronology</term>
<term>Geological significance</term>
<term>Gneiss</term>
<term>Granodioritic</term>
<term>Granodioritic magma</term>
<term>Granodioritic orthogneiss</term>
<term>Igneous origin</term>
<term>Isotopic</term>
<term>Kaduna</term>
<term>Kaduna orthogneiss</term>
<term>Kibaran</term>
<term>Lancelot</term>
<term>Lett</term>
<term>Lower intercept</term>
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<term>Planetary science letters</term>
<term>Precambrian</term>
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<term>Upper intercept</term>
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<term>Zircon</term>
<term>Zircon fractions</term>
<term>Zircon grain</term>
<term>Zircon grains</term>
<term>Zircon population</term>
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<term>Concordia diagram</term>
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<term>Data points</term>
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<term>Discordia line</term>
<term>Earth planet</term>
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<term>Eburnean event</term>
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<term>Euhedral</term>
<term>Euhedral zoning</term>
<term>Geochronology</term>
<term>Geological significance</term>
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<term>Granodioritic</term>
<term>Granodioritic magma</term>
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<term>Igneous origin</term>
<term>Isotopic</term>
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<term>Kibaran</term>
<term>Lancelot</term>
<term>Lett</term>
<term>Lower intercept</term>
<term>Magma</term>
<term>Magmatic</term>
<term>Magmatic corrosion</term>
<term>Metamorphic</term>
<term>Metamorphic event</term>
<term>Metamorphism</term>
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<term>Monazite</term>
<term>Multiple zircon growth</term>
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<term>Orthogneiss</term>
<term>Petrol</term>
<term>Planetary science letters</term>
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<term>Single monazite grain</term>
<term>Single zircon grains</term>
<term>Upper intercept</term>
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<term>Zircon</term>
<term>Zircon fractions</term>
<term>Zircon grain</term>
<term>Zircon grains</term>
<term>Zircon population</term>
<term>Zircon populations</term>
<term>Zircon systems</term>
<term>Zircon type</term>
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<front><div type="abstract" xml:lang="en">Abstract: Conventional UPb analyses on selected single zircon grains and on zircon fractions from a granodioritic orthogneiss at Kaduna (northern Nigeria) show that the Nigerian basement contains Archaean components that have not been recognized until now. A distinct U-rich zircon group records an age of 3040 ± 60 Ma, which is interpreted as the age of emplacement and crystallization of the granodioritic magma. The occurrence of a magmatic event at ca. 3000 Ma is confirmed by the addition of core-free abraded grains (3050 ± 23 Ma). These ages are identical to the less precise value (2980 ± 90 Ma) given by zircon fractions. These results also demonstrate that zircons underwent Pb loss during the Pan-African orogeny at 612 ± 23 Ma, which is well supported by an identical age on a single monazite grain (618 ± 8 Ma). Moreover, UPb analyses of abraded U-poor core-bearing crystals clearly identify the presence of source material of early Archaean age ( > 3500 Ma), the oldest age for crust initiating processes ever found in this area. In contrast to earlier RbSr geochronology no evidence for an Eburnean (2000 ± 200 Ma) or Kibaran (1100 ± 200 Ma) orogeny is present in the UPb systems of these zircons.</div>
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Early Archaean component ( > 3.5 Ga) within a 3.05 Ga orthogneiss from northern Nigeria: UPb zircon evidence

Early Archaean component ( > 3.5 Ga) within a 3.05 Ga orthogneiss from northern Nigeria: UPb zircon evidence

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri