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• W1991008099 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." @default.
• W1991008099 created "2016-06-24" @default.
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• W1991008099 date "1994-07-01" @default.
• W1991008099 modified "2023-10-01" @default.
• W1991008099 title "Early Archaean component ( > 3.5 Ga) within a 3.05 Ga orthogneiss from northern Nigeria: UPb zircon evidence" @default.
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• W1991008099 doi "https://doi.org/10.1016/0012-821x(94)90208-9" @default.
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