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| on April 26, 2015 RING COMPLEXES IN THE YOUNGER GRANITE PROVINCE OF NORTHERN NIGERIA CONTENTS I. INTSODUCTmN...II. GENERALFEATURES OlVTHE YOUNGER GRANITES (a) Distribution of the Younger Granites (b) Structural features...features (i) Volcanic structures (ii) Cone-sheets and ring-dykes (iii) The granite intrusions . (c) The (i)...Summary of the chemical characteristics of the Younger Granite province . 11 11 13 16 19 23 35 42 ... (d) Rop . . (e) Sha-Kaleri. 9 (f) Jos-Bukuru (g) Banke (h) K u d a r u (i) Ningi . . . . (j) Tongolo |
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| northern Nigeria T.A. BADEJOKO Department of Geology, University of lbadan, Ibadan (Nigeria) LITHOS...granites, northern Nigeria. Lithos, 17: 259-271. The biotite granites in the Nigerian Younger Granites are...February 14, 1984) Introduction The Younger Granites o f Nigeria are characterized by e n r i c h m e...volcanic-subvolcanic granite c o m p l e x e s o f Nigeria c o m m o n l y have late granitic intrusive phases...al., 1971). Geological setting The Younger Granites of Nigeria form the southern extension of a series |
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| of the Jarawa Younger Granite complex and its related mineralization, northern Nigeria E. G. Imeokparia...of the Jarawa Younger Granite complex and its related mineralization, northern Nigeria. Geological Magazine...of the Jarawa Younger Granite complex and its related mineralization, northern Nigeria E. G. IMEOKPARIA...City, Nigeria (Received 14 December 1983; accepted 22 June 1984) Abstract - The Jarawa Younger Granite...Granite complex is composed of high silica alkali granites that were emplaced 161 Ma ago. The granites are |
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| auhvolanic t o plutonic nature often in the form of ring complexes. These can be subdivided into two separate...by centres of ovcrsaturated magmatism such as Nigeria and Sudan. Thcre are also provinces with undersaturated...the abundance of zircon, uranium. thorium and complex Ti-Zr silicates, the importance o f columbite,...Geochemistry Mineralization Phanerozoic Cameron Niger Nigeria Sudan Saudi Arabia Namibia 1. Introduction Most...subvolcanic to plutonic nature often in the form of ring complexes. These can be subdivided into two separate |
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| A GRAVITY INTERPRETATION OF THE LIRUEI RING COMPLEX, NIGERIA SIR,-I should like to consider some implications...negative anomaly was to be expected in the Liruei complex, which consists almost entirely of granitic rocks...almost completely acidic nature of the Nigerian Younger Granite province has long been recognised from...evidence from Liruei now shows that these granitic ring-complexes are unlikely to be associated with large...basic magma-cannot therefore readily be applied to Nigeria. The gravity survey indicates that the contacts |
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| George Obaje Geology and Mineral Resources of Nigeria 123 Prof. Nuhu George Obaje Nasarawa State University...University Dept. Geology & Mining Keffi Nigeria nobaje@yahoo.com ISSN 0930-0317 ISBN 978-3-540-92684-9...Resources of Nigeria are very few and mostly not accessible in Libraries and Bookshops in Nigeria. This book...activities in the Geology and Mineral Resources of Nigeria. The author has brought together several published...students of geology in tertiary institutions in Nigeria and abroad. Additional insights were also provided |
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| London, Special Publications Niger-Nigerian alkaline ring complexes: a classic example of African Phanerozoic...Library on June 9, 2014 Niger-Nigerian alkaline ring complexes: a classic example of African Phanerozoic...development of chains of volcanoes now exposed as ring complexes with Palaeozoic and Mesozoic ages. The...between alkali metasomatism in alkaline granite ring complexes and fenitization associated with carbonatites...relevance to the anorogenic alkaline ring complex province in Niger and Nigeria. For example, the Pan-African |
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| GEOLOGICAL ABSTRACTS Part 8. Part 9. Swaziland Nigeria . • • • • • • • • • 343 , ' • • •...APPLICATION PROBLEMS . OF Gold Coast . Sierra Leone . Nigeria . . Uganda . . Kenya . . Tanganyika . Northern...making of cement, and in a number of them, as in Nigeria, Gold Coast, Kenya, Tanganyika, and Nyasaland,...investigation of ground-water supplies, and even, as in Nigeria, N yasaland, and Uganda, with their development...and grouted. Nigeria For about 16 years prior to 1947 the Geological Survey of Nigeria carried out an |
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| Geochemistry of the Tioueine Pan-African Granite Complex (Hoggar, Algeria) : A. Azzouni-Sekkal and J . Boissonnas...Accessory Mineralogy of the Ririwai Biotite Granite, Nigeria, and its Albitized and Greisenized Facies: R. A...Magmatism, and Metamorphism in the Lower Benue Trough, Nigeria: J. Benkhelil ................... 467 A Model for...that the second event may be correlated with a younger orogeny possibly linking it to the Eburnean. ©...The oldest surrounding granitoids are coeval or younger than the supracrustals and both intrusive and |
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| colour index. This is, without doubt, the most complex lithologie association to be handled from the point...ores are almost always "epigenetic", that is, younger than the adjacent rock and generally emplaced when...abundant, provide reservoirs to fluids generated by younger (often the youngest) phases that are usually volumetrically...or in the mine workings at all. The Climax Mo complex is the best known example. Here three generations...emplaced by large-scale magmatic stoping and as ring dikes or cone sheets. Additional characteristics |
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| colour index. This is, without doubt, the most complex lithologic association to be handled from the point...ores are almost always "epigenetic", that is, younger than the adjacent rock and generally emplaced when...abundant, provide reservoirs to fluids generated by younger (often the youngest) phases that are usually volumetrically...or in the mine workings at all. The Climax Mo complex is the best known example. Here three generations...emplaced by large-scale magmatic stoping and as ring dikes or cone sheets. Additional characteristics |
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| AIr ring complexes and the chapter devoted to the Cameroon line. A detailed review of African ring complexes...discrimination between tholeiitic, transitional and alkaline ring complexes. Based on the available data (including...so-called alkaline intrusions which occur in African ring complexes are associated with tholeiitic or transitional...geochemical criteria discriminating the anorogenic ring complexes (including A - granites s.s.) from the...review our present knowledge of the main African ring complexes and emphasize the need for a new classification |
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| EDITORIAL PAGE 1 ARTICLES The Chambe Plateau Ring Complex of Nyasaland. By K. V. Stringer, B.Sc. ...the Colonies 40 The Anorthosites in the Colony Complex near Freetown, Sierra Leone. By M. K. Wells, M...Somaliland . Bechuanaland Swaziland Federation of Nigeria Gold Coast . Sierra Leone Federation of Malaya...REVIEWS The Cretaceous Ammonoidea of Southern Nigeria and the Southern Cameroons. By R. A. Reyment, M...VOLUME 6 508 Illustrations The Chambe Plateau Ring Complex of Nyasaland Plate I Plate II Plate III |
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| continents and countries is as follows: Morocco 3 Nigeria 1 Rhodesia 4 South Africa 20 South West Africa...(all publications) Geological Survey of Nigeria (Geol. Surv. Nigeria) Geological Survey of South Australia...Azegour-Tizgui, is described here. It is much more complex than the others; in the northern part, the limy...lenses in which the garnet is andradite and hedenbergite and iron-rich idocrase are present. In these...margin of the gar netized rock is a belt of hedenbergite-rich skarn in which the principal ore mineral |
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| Magmatic Evolution and Mineralization in the Nigerian Younger Granite Province . . . 51 P. Bowden Tourmalinization...Distribution in Tin-bearing Pegmatites of Southwestern Nigeria. . . . . . . G. Matheis, W.O. Emofurieta and S...Department of Geology, University of Ife, Ile-Ife, Nigeria B.J. FRYER Department of Geology, Memorial University...Nigerian Steel Development Authority, Kaduna, Nigeria OHIWEREJ List of Contributors IX B. VAN DE...metallotects: (1) intracontinental hot spots (e.g. Jos Plateau) and consequent, but aborted, rifts (e.g. Sullivan |
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| A. & BATCHELOR, R . A . Niger-Nigerian alkaline ring complexes: a classic example of African Phanerozoic...lithospheric mantle is old and will have had as complex a metamorphic and magmatic history as the overlying...transported to the magma chamber roof zones as complex ions in a volatile phase. Carbonatites provide...Bowden et al. ( N i g e r - N i g e r i a granite ring complexes), Eby (Monteregian Hills and White Mountain...Potassium-argon geochronology of the Poohbah Lake alkaline complex, northwestern Ontario. Can. J. Earth Sci. 13, 1456-9 |
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| A. Bogatikov 199 The Ti hama Asir I gneous Complex , a passive marg i n ophiolite R. G. Coleman 22...upper part of the critical zone of the Bushveld complex and its bearing on the origin of the Merensky Reef...sorretirres appear , granite included (Jos plateau in Nigeria, White M:)untains massif in the Appalachians)...of the Basin and Range Province, and Col umbian plateau basalts associated with intraplate volcanism; 4)...influence of intraplate magmatism. This kind of complex environment, de.n oted as the M::)ngol-Okhotsk |
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| oxides and similar compounds, oxidic compounds with complex anions, and a few organic species. Mineral species...Subsidim-y anions (OH,F,O) are positioned before the complex anion , with both enclosed in square brackets,...of the valency electrons of the oxygens of the complex ions are involved in bonding to the cations". The...halides without H2O 3.B Simple halides with H2O 3.C Complex halides 3.D Oxyhalides, hydroxyhalides, and related...(groups of islands silicates) 9.C Cyclosilicates (ring silicates) 9.D Inosilicates (chain silicates) 9 |
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| allocated on a structural basis: vol. 1. Ortho- and Ring Silicates, vol. 2. Chain Silicates, vol. 3. Sheet...the relative stabilities of minerals in quite complex chemical systems. In geochronology, the K—Ar and...the present volume. Amphiboles are notoriously complex chemically and their nomenclature was the subject...gedrites, the Méssbauer and infrared spectra are very complex. The various investigations, including those by...13 to 1.50 pfu., respectively. Some unusually complex intergrowths of gedrite in anthophyllite were observed |
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| Hausmannite Hauyne Hawleyite Heazlewoodite Hectorite Hedenbergite Hematite Hemihedrite Hemimorphite Hercynite...mineralization may either be the product of a complex polyphase mineralizing process, reflecting a combination...intrusions of Archaean age such as the Bushveld Complex, South Africa. Stratiform Cr deposits account for...the Steelpoort region of the eastern Bushveld Complex. Stratiform deposits contain substantial reserves...1–420 47 Fig. 03.03. The Bushveld ultrabasic complex, South Africa (Fe, Cr, and PGE) and the Great Dyke |
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| Hausmannite Hauyne Hawleyite Heazlewoodite Hectorite Hedenbergite Hematite Hemihedrite Hemimorphite Hercynite...mineralization may either be the product of a complex polyphase mineralizing process, reflecting a combination...intrusions of Archaean age such as the Bushveld Complex, South Africa. Stratiform Cr deposits account for...the Steelpoort region of the eastern Bushveld Complex. Stratiform deposits contain substantial reserves...1–420 47 Fig. 03.03. The Bushveld ultrabasic complex, South Africa (Fe, Cr, and PGE) and the Great Dyke |
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| tehtävä perusteltu kirjallinen ehdotus hallitukselle. Jos hallitus puoltaa ehdotusta, on vaali toimitettava...samalla tavalla kuin sääntöjen muutosehdotus. 20 (/. Jos seura purkautuu tai lakkautetaan, on sen jäljelle...major orogenies, the older Svecofennian and the younger Karelian. I n addition, there is a sandstone formation...formation, ooldest red)),which has been presumed to be younger than the orogenies mentioned. Wegmann (1928) introduced...probably the less-deformed arkosic rock is usually younger than the molasse deformed by the orogenic movements |
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| tehtävä perusteltu kirjallinen ehdotus hallitukselle. Jos hallitus puoltaa ehdotusta, on vaali toimitettava...samalla tavalla kuin sääntöjen muutosehdotus. 20 (/. Jos seura purkautuu tai lakkautetaan, on sen jäljelle...major orogenies, the older Svecofennian and the younger Karelian. I n addition, there is a sandstone formation...formation, ooldest red)),which has been presumed to be younger than the orogenies mentioned. Wegmann (1928) introduced...probably the less-deformed arkosic rock is usually younger than the molasse deformed by the orogenic movements |
 | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) |
| and O, OH, F, and H20 Groups and Other Anions or Complex and Some Beryllosilicates 1020 1061 1106 1116...followed in this edition. The many and often very complex silicate minerals are here classified for the first...may be less for simple structures or more for complex ones. Typically, the projection is down the shortest...but ant predomin the to refers label The true. complex structures this may not be by species in a site...appearance of its surfaces in reflected light. It is a complex property that depends on a mineral’s reflectivity; |
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| (crystal class) designation; the latter may contain complex symmetry operations such as glide planes (instead...localities in Greenland, Scotland, Norway, USSR, Nigeria, Kenya, India, and elsewhere. SELECTED REFERENCE:...Pantelleria, Mediterranean Sea, in the Liruei Complex, Nigeria; and widespread in the rocks of East Africa...206•H20 Zeolite Group AMPHIBOLE GROUP A chemically complex group of orthorhombic or monoclinic double-chain...Thompsons, Grand County; in New Mexico as superb complex crystals over ½ inch in size encrusting sandstone |
