 | | Journal (article/letter/editorial) |
| ASSOCIATED WITH MOLYBDENITE MINERALIZATION (KIGOM COMPLEX, NORTHERN NIGERIA) EBO GAB IMEOKPARIA Department of...of Geology, University of Benin, Benin City (Nigeria) (Received August 8, 1983; revised and accepted April...mineralization (Kigom Complex, northern Nigeria). Chem. Geol., 47: 261--283. The Kigom igneous complex...northern Nigeria is a small intrusive complex made up of peralkaline arfvedsonite granite, riebeckite-biotite...riebeckite-biotite granite and riebeckite-aegirine granite. The granites show coherent major-element chemistry typical |
 | | Journal (article/letter/editorial) |
| OCTOBER 1961 YOUNGER INTRUSIVE ROCKS OF PLATEAU PROVINCE, NIGERIA, COMPARED WITH THE ALKALIC ROCKS OF NEW...By ROBERT GREENWOOD ABSTRACT In north-central Nigeria a group of rocks of alkalic affinities, known as...mafic rock is unusually high. The appearance of riebeckite, aegirine, hedenbergite, ironrich biotite, and...differentiation. The Younger Intrusive Series of Nigeria is highly discordant to pre-existing structures...remarkably similar to the Younger Intrusive Series of Nigeria in history, structure, and petrology. Mineralogical |
 | | Journal (article/letter/editorial) |
| 358 Amphiboles from the Younger Granites of Nigeria. Part I. Chemical classification. By Mrs. G. D....7 June 1962.] Summary. The Younger Granites of Nigeria contain varied assemblages of iron-rich ferromagnesian...out on the granitic ring-complexes of Northern Nigeria, no systematic study has been made of variations...25 000 square miles in the Northern Region of Nigeria. About forty of these complexes have been found...different localities in the Jos area of Northern Nigeria. AMPHIBOLES FROM NIGERIA. PART I 359 volcanic |
 | | Journal (article/letter/editorial) |
| (1970) Origin of the Younger Granites of Northern Nigeria P. B o w D ~ Department of Geology, University...spate of publications on the younger granites of Nigeria (Jacob son et al., 1958; Turner, 1963, 1968; Choubert...a number of independent lines of research from Nigeria and other areas, which when blended together provide...Regional Setting The central area of northern Nigeria is underlain by Preeambrian schists and gneisses...(1968, p. 122, Table 3). Liruei complex albite-riebeckite granite Liruei complex tin lode in biotite granite |
 | | Report (chapter) |
| COMPLEXES IN THE YOUNGER GRANITE PROVINCE OF NORTHERN NIGERIA CONTENTS I. INTSODUCTmN . . . . Page 5 ....rock types . Rhyolites . . Biotite-granites . Riebeckite-granites Amphibole-fayalite-granites . Basic...19 23 35 42 (d) Rop . . (e) Sha-Kaleri. 9 (f) Jos-Bukuru (g) Banke (h) K u d a r u (i) Ningi . . ....The initial survey recorded the presence of riebeckite-granite, the discordance between the Younger...thesis, unpublished). During the resurvey of the Plateau tinfields between 1945 and 1948, R. A. Mackay, |
 | | Journal (article/letter/editorial) |
| by centres of ovcrsaturated magmatism such as Nigeria and Sudan. Thcre are also provinces with undersaturated...Geochemistry Mineralization Phanerozoic Cameron Niger Nigeria Sudan Saudi Arabia Namibia 1. Introduction Most...accompanied the uplift which followed it. I n Niger-Nigeria and also Sudan a more or less continuous sequence...Similarly the Mesozoic oversaturated magmatism of Nigeria has an almost identical age range to the mixed...similar age range to the oversaturated complexes of Nigeria. The Namibian Province (19CL120 ma) comprises of |
 | | Journal (article/letter/editorial) |
| Ambasibitika, Madagascar(16), is a pseudomorph after riebeckite (Lacroix, 1922) and has a compositionsimilar...rocks or their pegmatites and are associatedwith riebeckite or arfvedsonite as describedbelow. They are believed...Aegirine-riebeckite granite: Quincy, Massachusetts (Washington and Merwin, 1927; Aoki, 1964); Kigom Hills...Hills, Nigeria (Greenwood, 1951; Jacobson, Macleod, and Black, 1958). Nepheline syenite: Kangerdluarsuk,...perplexing is the presenceof authigenic acmite and riebeckite in the Green River formation, depositedat or |
 | | Journal (article/letter/editorial) |
| hastingsite) and alkali amphiboles (arfvedsonite and riebeckite) in the middle and later stages. These trends... It. e. Cony". i ee.67 -f . f ," Aegirine riebeckite granite-pegmatite, Quincy, Mass., U. S. A. Arfvedsonite...1953). Riebeckite aegirine granite, south Kigom Hills, Nigeria (Greenwood, 1951). Aegirine riebeckite quartz...arfvedsonitecrystallizedfrom the magmasin the later stages,and riebeckite crystallizedduring the last (pegmatitic) stage...pla1, an important role. Stability relations of riebeckite and riebeckitearfvedsonite soiid solutions have |
 | | Journal (article/letter/editorial) |
| 359 The riebeckite-bearing dikes of Shetland (With Plate III) By JAMESI)HEMISTER With data on the chemical...chemical composition and constitution of riebeckite by C. O. HARVEY and P. A. SABINE Ge0b)~.ical Survey...and spherulitic. Many of the felsites contain riebeckite and aegirine and have a corresponding blue or...es are older than the felsites, and the blue riebeckite-felsite,s are younger than white, pink, and dull...red felsites which contain neither aegirine nor riebeckite. The dikes of the swarm range in width from 2 |
 | | Book |
| 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 |
 | | Journal (article/letter/editorial) |
| fayalite-bearing rocks to types containing Na-hornblende, riebeckite and aegirine. . . . . . . . . . . . . . . . ...in the cooling history of the complex, include riebeckite-astrophyllite granites of close affinity to some...the syenite which is believed to underlie the plateau to the east of the ridge. III. THE WESTERN LAYERED...distinctive suite of sodic rocks ranging from riebeckite granites through to aegirine-bearing microgranites...coarse soda-granites, mostly riebeckite granites, b) striped aegirine-riebeckite microgranites and c) the |
 | | Book |
| ................................. 5.11 Bamoun Plateau ................................. 5.12 Mounts Bambouto...Benue Valley ....................... 5.15 Kapsiki Plateau .................................. 5.16 Other Volcanic...and Galinier (1847), on the northern Ethiopian Plateau in Tigre Province. A major advance in Ethiopian...reiterated a post-Jurassic age for the Ethiopian Plateau lavas. During 1883, the N. Thnganyika and S. Kenyan...the massive escarpment separating the Abyssinian Plateau from western Afar and the Red Sea had formed by |
 | | Book (volume) |
| 321 Barkevikite ......... 328 Glaucophane-Riebeckite Richterite ...... 333 ......... 352 Kat...the amphibolite facies of the Central Abukuma Plateau, Japan (Shido, 1958; Miyashiro, 1958), the (Mg...al. (1958) from the ring complexes of northern Nigeria, and in the rocks of this area the hedenbergite...R., 1958. younger granite province of northern Nigeria. No. 1. Jong, W. F. de, 1959. General crystallography...Gosaisyo—Takanuki district in the Central Abukuma Plateau. Journ. Fac. Sci. Univ. Tokyo, vol 11 p. 219. Morimoto |
 | | Book (volume) |
| Glaucophane-Ferro-glaucophane Magnesio-riebeckite—Riebeckite Eckermannite-Ferro-eckermannite Leakeite—Ferro-leakeite...AlbO>7](OH,F)> (d) Sodic amphiboles Glaucophane-riebeckite Na>(Mg,Fe**)3(Al,Fe**)s[Sig05](OH,F)2 Ecker...Mg3;Al, for Mg; and Sig for SigAl, respectively. Riebeckite, arfved- sonite and kozulite involve the isovalent...which M4 is occupied by Ca or Na (e.g. actinolite-riebeckite), and pairs with and without A-site occupancy...category are anthophyllite, tremolite, actinolite, riebeckite (known as crocidolite when asbestiform) and grunerite |
 | | Journal (volume) |
| 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...prccambriennes de la partie meridionale du Haut Plateau angol ais. Bull. Bur. Rech. geol. min. (2 serie...localities mentioned in the text: Uganda: Bj-Buhweju plateau: K a-Kamena Fe; Ki-Kirwa W ; Ke-Karenge G4 granite:...(quartzites, sandstones and phyllites) in the Buhwcju plateau (Ankole, Uganda). At Buhweju, the placers nearly |
 | | Journal (article/letter/editorial) |
| the Kaffo albite-riebeckite granite of Liruei Complex, Younger Granites of Nigeria 18(4): 297-308 0177...Solubility equilibria in basalt aquifers; the Columbia Plateau, eastern Washington, U.S.A. 0400 Devine, S. B.;...geochemical studies of samples from the Niger Delta (Nigeria); I, Analyses of crude oils for triterpanes 27(1-2):...geochemical studies of samples from the Niger Delta (Nigeria); I1, Analyses of shale for triterpenoid derivatives...Liruei (Ririwai) Complex, Younger Granite Province, Nigeria 45(3-4): 225-243 0464 EI-Askary, M. A.; and EI-Mahdy |
 | | Journal (volume) |
| Contents EDITORIAL PAGE 1 ARTICLES The Chambe Plateau Ring Complex of Nyasaland. By K. V. Stringer, B...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...INDEX TO VOLUME 6 508 Illustrations The Chambe Plateau Ring Complex of Nyasaland Plate I Plate II Plate...Face of Ring -dyke B. Plateau Ring · facing p. Location Map of Chambe Plateau Area . Outline Map showing |
 | | Book |
| and Ruoritic types, and the oxidized Colorado Plateau deposits are desc1ibed vvith those that are unoxidized..., Blind River, \i\litwatersrand, and Colorado Plateau. The writer has attempted to present equitably... . . . . . . . . . . . . . . . . . . Colorado Plateau . . . . . . . . . . . . . . . . . . . . . . . ...In the disse1ninated deposits of the Colorado Plateau, two general types of pitchblende co1nn1only are...lodes in sandstones and conglomerates ("Colorado Plateau types") ( Chap. 10) with (a) a vanadiferous association |
 | | Journal (issue) |
| Bechuanaland • • • Protectorate Federation of Nigeria • • • • • • • • • • • • • • • •...North-eastern Barber. (R.eviewby C. W. Wright) . . Nigeria. . . Traite de Geologie, Vols. 1, 2 and 3. By... a a . a mica . an amphibole ( =fibrous riebeckite) (var. asbestos) • • clay chlorite • 10-11-26...Simba-Kibwezi, South. Magadi, South Horr, Kapsabet-Plateau, Kijabe and North Machakos areas was completed...Mountain which lies to the north of the Zomba Plateau. Malosa was found to consist of rock types similar |
 | | Book |
| large overabundances must be involved. On the plateau region of the curve of growth the equivalent width...ΓΊ I I I 1 1 ! 1 1 ! 1 1 11 1 1 H Columbia Plateau 5REE=232ppm - - ^ i- 1 1 —1 * ! 0.5 1 1 ...abbreviations: la-c, Main sandstone-types of the Colorado-Plateau (Newman, 1962). 2, German greywackes (Wedepohl...Carinthia). 2, Triassic sandstones of the Colorado Plateau (Newman, 1962). 3a-c, Sedimentary rocks of the...evolution of the younger granites of Northern Nigeria. Geochim. Cosmochim. Ada 26, 89-100. BROTZEN, O |
 | | Book |
| 15%, Thailand 11%, Indonesia 12%, Australia 6%, Nigeria 1%, Zaire 1% with the remainder emanating from...concentration levels. This is well seen in Brazil and Nigeria, which although important producers, are almost...Portugal France, Massif Central - Brittany (4) Africa Nigeria Central Africa:Zaire, Rwanda, Burundi, Uganda,...microgranite, and rhyolite. Alkali granites present in Nigeria. Plutonic and porphyritic textures present. Economic...Very minor Secondary ores:- Major Examples. Nigeria Brazil - Rondonia ? South-West Africa General Environment |
 | | Book (volume) |
| bauchite (fayalite-bearing quartzmoozonite), Bauchi, Nigeria ('Oyawoye and Makanjuola, 1972). 31 32 33 34 Single-Chain...of the Tabito complex, Nakoso district, Abukuma plateau, Japan (Onuki and Kato, 1971). Phenocrysts of clinoenstatite...number of localities in the basement complex of Nigeria (Oyawoye and Makanjuola, 1972). Orthopyroxenes...of the Tabito plutonic complex in the Abukuma plateau. Sci. Repts., Tohoku Univ., Ser. HI, 11, 113- 123...described from the ring complexes of northern Nigeria (Jacobson et al., 1958) ; in the rocks of this |
 | | Book (edition) |
| . . . . . . 13.3 PLUME HEADS AND BASALT FLOOD PLATEAU LAVAS 13.3.1 Oceanic Plateaus . . . . . . . . ... . . . . . . 389 Anorogenic Ring Complexes in Nigeria and Niger . . . . . . . . . . . 390 GRANITES AND...Composition of Basalt from the Columbia River Plateau, Sample BCR-1a 54.06 Ag 27* Er 3.63 Nd 28...pyroxene (NaFe3Si2O6) and the alkali amphiboles riebeckite richterite (Appendix A), and aenigmatite in which...metamorphism. Water in an enclosed lake on a high plateau has gravitational potential energy relative to |
