 | | Journal (article/letter/editorial) | | press), two samples from the Seal Island Bight complex, northern Newfoundland (Taylor 1979), one sample...the Welsford complex, southern New Brunswick (Jackson 1968), 15samples from the Evisa Complex of Corsica...Corsica (Bonin et al. 1978), 11 samples from the Shira complex, one of the most peralkaline and oldest (200...(200 Ma) of the Younger Granite complexes in Nigeria (Bowden 1982, pers. com.) and 25 samples from nine...peralkaline granites (Topsails, Welsford, Evisa and Shira) exhibit moderate to strong variations. The well |  | Bowden, P., Bennett, J. N., Kinnaird, Judith A., Whitley, J. E., Abaa, S. I., Hadzigeorgiou-Stavrakis, Penelope K. (1981) Uranium in the Niger-Nigeria Younger Granite Province. Mineralogical Magazine, 44 (336) 379-389 doi:10.1180/minmag.1981.044.336.03 | Journal (article/letter/editorial) | | 1981, VOL. 44, PP. 379 89 Uranium in the Niger-Nigeria Younger Granite Province P. BOWDEN, J. N. BENNETT...Department of Geology, Ahmadu Bello University, Zaria, Nigeria PENELOPE K. HADZIGEORGIOU-STAVRAKIS Department...sedimentary uranium deposits may also be found in Nigeria if the tectonic and sedimentological controls were...rocks associated with the Tarrouadji alkaline ring complex which is the southern-most of a chain of such structures...sodium and uranium, possibly as a sodium-uranyl complex (Bowie, 1979), and which have undergone variable |  | | Journal (article/letter/editorial) | | intrudes an apparently comagmatic bimodal volcanic complex and folded Ordovician metasediments. while the...and foyaite) are only found in the Larvik ring complex (Neumann. 1980). Topsails suite The Topsails suite...volcanics. The variety of lithologies suggests a complex history for this terrane. Initial 87Sr j 86 Sr...have been emplaced into the Precambrian Basement Complex of Sudan. These complexes postdate the Pan-African...1985). The Sabaloka igneous complex and the Ras ed Dom ring 118 complex are considered to be representative |  | | Journal (article/letter/editorial) | | ferroaugite, hornblende, fayalite, magnetite, zircon and orthopyroxene (Izett and Wilcox, 1968, Table...to the Lava Creek B ash bed of the Yellowstone complex (G. A. Izett, pers. comm., 2000). Associated phases...quartz, sanidine, oligoclase, fayalite, hornblende, zircon and magnetite. This chevkinite shows zoning in...the average of 22 points. The Timedjelalen ring-complex is part of the Iforas alkaline province of Mali...shield and the West African craton 600 Ma ago. The complex comprises six principal concentric phases, T1 T6 |
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