U-Pb geochronology of potassic syenites from Southwestern Nigeria and the timing of deformational events during the Pan-African Orogeny
Identifieur interne : 001368 ( Main/Exploration ); précédent : 001367; suivant : 001369U-Pb geochronology of potassic syenites from Southwestern Nigeria and the timing of deformational events during the Pan-African Orogeny
Auteurs : M. A. Rahaman [Nigeria] ; I. A. Tubosun [Nigeria] ; J. R. Lancelot [France]Source :
- Journal of African Earth Sciences [ 0899-5362 ] ; 1991.
Abstract
Two syenite bodies from south-western Nigeria considered to be pre to syntectonic (Iwo) and late tectonic (Okeiho) with respect to the dominant N-S trending structures that characterize the Nigerian Percambrian basement were dated by the U-Pb zircon method. However, they yield Pan-African emplacement ages of 610 ± 7 Ma and 618 ± 4 Ma respectively which are indistinguishable within limits of the experimental errors. This suggests that the Pan-African deformation in the region was either migratory or heterogeneous in nature. Comparison of these results with data from other parts of the Pan-African domain east of the West African craton provides further evidence of the synchronous nature of the peak of Pan-African magmatism (630-600) in the area.
Url:
DOI: 10.1016/0899-5362(91)90102-5
Affiliations:
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However, they yield Pan-African emplacement ages of 610 ± 7 Ma and 618 ± 4 Ma respectively which are indistinguishable within limits of the experimental errors. This suggests that the Pan-African deformation in the region was either migratory or heterogeneous in nature. Comparison of these results with data from other parts of the Pan-African domain east of the West African craton provides further evidence of the synchronous nature of the peak of Pan-African magmatism (630-600) in the area.</div></front></TEI><affiliations><list><country><li>France</li><li>Nigeria</li></country><region><li>Languedoc-Roussillon</li><li>Occitanie (région administrative)</li></region><settlement><li>Montpellier</li></settlement></list><tree><country name="Nigeria"><noRegion><name sortKey="Rahaman, M A" sort="Rahaman, M A" uniqKey="Rahaman M" first="M. A." last="Rahaman">M. A. Rahaman</name></noRegion><name sortKey="Tubosun, I A" sort="Tubosun, I A" uniqKey="Tubosun I" first="I. A." last="Tubosun">I. A. 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