The geology of some northern Nigerian anorogenic ring complexes

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Authors:Bennett, J. N.; Turner, D. C.; Ike, E. C.; Bowden, P.
Author Affiliations:Primary:
Heathside, Thursley Road, Elstead, Zambia
Other:
Univ. Zambia, Sch. Mines, Nigeria
Ahmadu Bello Univ., Dep. Geol., Nigeria
Univ. Saint Andrews, Dep. Geol., United Kingdom
Source:Overseas Geology and Mineral Resources, Vol.61, 65p. Publisher: Great Britain, Institute of Geological Sciences, London, United Kingdom. ISSN: 0030-7467. ISBN: 0-11-884350-8
Publication Date:1984
Note:In English. 125 refs. Color geol. map 1:250,000
Summary:A 1:250 000 geological map of 24 anorogenic ring complexes of Northern Nigeria is presented and accompanied by an account of the geology of 10 of the ring complexes. The complexes of Birnin Kudu, Dago, Dutse, Fagam and Shira are described for the first time, while only the structural outlines of the Kila-Warji and Ningi-Burra complexes were known previously. The volcanic successions at Banke, Ningi-Burra and Tibchi are described in some detail. Microprobe analyses are tabulated for fayalites (Fa92-99), pyroxenes (ferrohedenbergites, ferroaugites, hedenbergites, aegirine), amphiboles (arfvedsonites, ferrorichterites, ferroedenite, ferroactinolites, ferrowinchite), biotites, plagioclases, alkali feldspars, aenigmatites, narsarsukites, chevkinites, allanites and Fe-Ti oxides. A review of the geochemistry of the whole province is undertaken for the first time and factors related to petrogenesis are discussed. [R.A.H.]
Subjects:Complexes; Dikes; Fayalite; Geochemistry; Granites; Igneous rocks; Intrusions; Lava; Magmas; Nesosilicates; Olivine group; Orthosilicates; Petrology; Plutonic rocks; Pyroclastics; Ring complexes; Ring dikes; Silicates; Structural geology; Syenites; Tuff; Volcanic rocks; Africa; Nigeria; West Africa; Banke Complex; Birnin Kudo Complex; Dago Complex; Dutse Complex; Evolution; Fagam Complex; Kila-Warji Complex; Ningi-Burra Complex; Northern Nigeria; Shira Complex; Tibechi Complex; Color geol. map
Abstract Numbers:85M/0947
Record ID:1985029108
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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