K-Ar ages of intrusive rocks in the Oban-Obudu massif and their significance for the tectonic and plutonic history of southeastern Nigeria

K‐Ar ages have been obtained for mineral separates: plagioclases from two dolerites and biotites from one granite and four granodiorites in the Oban‐Obudu massif of southeastern Nigeria. Dolerites in the Oban area give K‐Ar plagioclase ages of 204.0 ± 9.9 Ma and 219.9 ± 4.7 Ma. The granite of the Ob...

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Veröffentlicht in:	The island arc 1997-12, Vol.6 (4), p.353-360
Hauptverfasser:	Ekwueme, Barth N., Itaya, Tetsumaru, Yabe, Hisatomo
Format:	Artikel
Sprache:	eng
Schlagworte:	biotites dolerites granite granodiorite K-Ar ages magmatism Marine plagioclase southeastern Nigeria
Online-Zugang:	Volltext
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