| Mineralization of pegmatites in parts of the Oban Massif, Southeastern Nigeria： A preliminary analysis |
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| 作者姓名： | Kingsley A.Ero Ekwueme Barth N. |
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| 作者单位： | Department of Geology, University of Calabar, P.O. Box 3651 Unical Post Office, Calabar, Nigeria |
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| 摘 要： | The Oban Basement Massif of southeastern Nigeria is composed of metamorphosed rocks including phyllites, schists, gneisses and amphibolites cut by pegmatitic dykes of varying length and thickness, which intruded the metamorphic rocks. Preliminary geochemical study and analysis of these pegmatites from western Oban Massif at Uyanga, Akwa Ibami, Iwuru I, Iwuru Ⅱ and Igbofia showed that the pegmatites are highly albitized. This is incon-sistent with earlier postulations that the pegmatites in this part of Nige...
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| 关 键 词： | 尼日利亚 地块 矿化 化学研究 稀有金属 变质岩 岩石包 东南部 |
| 收稿时间： | 26 July 2004 |
Mineralization of pegmatites in parts of the Oban Massif,Southeastern Nigeria: A preliminary analysis |
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| Kingsley A.Ero,Ekwueme Barth N..Mineralization of pegmatites in parts of the Oban Massif,Southeastern Nigeria: A preliminary analysis[J].Chinese Journal of Geochemistry,2009,28(2):146-153. |
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| Authors: | Kingsley A Ero Barth N Ekwueme |
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| Institution: | Department of Geology, University of Calabar, P.O. Box 3651 Unical Post Office, Calabar, Nigeria |
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| Abstract: | The Oban Basement Massif of southeastern Nigeria is composed of metamorphosed rocks including phyllites, schists, gneisses
and amphibolites cut by pegmatitic dykes of varying length and thickness, which intruded the metamorphic rocks. Preliminary
geochemical study and analysis of these pegmatites from western Oban Massif at Uyanga, Akwa Ibami, Iwuru I, Iwuru II and Igbofia
showed that the pegmatites are highly albitized. This is inconsistent with earlier postulations that the pegmatites in this
part of Nigeria are barren. Indices of fractionation such as Ba/Rb, K/Rb, Na/K, K/Cs, K/Ba reveal that the pegmatites are
mineralized and different discrimination plots show that they are enriched in Li, Be, Sn, Ba, Ta, Ni, Cs, Sn and Zn. Rare
metal indicative elements such as Ta, Nb, Rb, Cs, and Sn are enriched in the pegmatites, confirming that the pegmatites are
mineralized. |
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| Keywords: | Precambrian pegmatite mineralization Oban Massif rare-earth element |
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