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| 7 The geology and mineral resources of northern Sierra Leone A. Macfarlane, M. J. Crow,]. W. Arthurs...1981. The geology and mineral resources of northern Sierra Leone. Overseas Nlem. Inst. Ceo{. Sci., No. 7...Scarcies River confluence 66 TheKambia area 66 The northern Sula Mountains 67 Nickel 67 Cassiterite 67 Columbite-tantalite...processing 79 Appendix 2 The geochronology of Sierra Leone Post tectonic intrusives 89 The Rokelide Belt...The Basement Complex 92 The Eburnian event in Sierra Leone 92 The concept of age provinces 93 The Liberian |
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| Ijolites at Songo, Sierra Leone. By C. 0. Baker, B.Sc., and Vladi Marmo, Dr.Ph., Sierra LeoneGeologicalSurvey...SURVEYS Kenya • • • • • • • • Tanganyika • • • • Northern Rhodesia • • • • • Nyasaland • • • • • • • Bechuanaland...• • Occurrence of Helium-bearing Gases in Lake Province, Tanganyika Platinum Metals Review . . . Sedimentological...393 393 393 398 399 404 ljolites at Songo, Sierra Leone Plate I Text-fig. 1 Text-fig~ 2 Text-fig. 3...defined in Nyasaland only by the Cholo Scarp at the northern end which rises in a wall-like mass cut sharply |
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| Ph. (Helsinki), GeologicalSurvey Department, Sierra Leone . . The Location of Underground Water Supplies...SURVEYS Kenya • • • Uganda • • • Tanganyika • Northern Rhodesia • Nyasaland • • • Bechuanaland • • Nigeria... . . . . Manner of Occurrence of Microcline in Sierra L,eone Granites . . . . . page 430 '' 433...extends in a south-westerly direction from the northern shore of Lake Victoria, and is dominated in the...1954. '' Erosion levels and laterite in Buganda Province, Uganda.,, C.R. 19e Sess. Congr.geol. internat |
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| Anorthosites in the Colony Complex near Freetown, Sierra Leone. By M. K. Wells, M.Sc. , Ph.D., and C. O. Baker...Ijolites at Songo, Sierra Leone. By C. O. Baker, B.Sc., and Vladi Marmo, Dr.Ph., Sierra Leone Geological Survey...GEOLOGICAL SURVEYS Kenya Uganda Tanganyika . Northern Rhodesia Nyasaland . Somaliland . Bechuanaland...Swaziland Federation of Nigeria Gold Coast . Sierra Leone Federation of Malaya British Territories in...for Uranium and Thorium Mineral Production in Northern Rhodesia Crust of the Earth Statistical Summary |
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| Kimberlite in Sierra Leone. By D. R. Grantham, Ph ..D., M.I.M.M., F.G.S., Sierra Leone Selection Trust...SURVEYS Uganda • • • • • • Tanganyika • • • • • • Northern Rhodesia • • • • • Nyasaland • • • • • • • Somaliland...Dixey, C.M.G., F.R.S. • • • Kimberlites in Sierra Leone Plate I Photomicrographs 1. 2. of Kimberlite...garnet and recrystallised pyroxene Plate III Sierra Leone Diamonds . . . • • 1. Elongated 'glassy' octahedron...multiple points and minor plates Plate IV Sierra Leone Diamonds . . . . . 1. Octahedron with trigons |
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| SPECIALIST Ass!STANCE KENYA UGANDA TANGANYIKA 44 NORTHERN RHODESIA. 48 57 59 62 NYASALAND SoMALILAND PROTECTORATE...Somaliland Geological Surveys 61 New Survey Building, Northern Rhodesia Plate XI " 78 Views from the Gold Coast...Geological Survey Plate XII " Field Activities of the Sierra Leone Geological Plate XIII 79 Survey " Activities..." Text-fig. 3 Progress of Geological Mapping, Northern Rhodesia 45 " Geological Mapping in Nyasaland...76 " Text-fig. 11 Geological Mapping by the Sierra Leone Geological Survey 82 " Text-fig. 12 Geological |
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| vicinity, southern Kordofan Province 7 Southern and south-western Sudan, northern Uganda, Zaire, and Central...Republic 8 Darfur Province and eastern Chad 9 North Kordofan, Darfur, and Northern Provin<:(� 11 Jebel...14 Port Sudan and the central Red Sea Hills 14 Northern Red Sea Hills of Sudan 15 Eastern Desert of southern...Plains of central Sudan 17 Southern Blue Nile Province of Sudan and the western borders of Ethiopia 19...rocks of the Basement Complex Ring complex igneous province Dyke swarms Cainozoic volcanic activity Faulting |
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| mineral provinces in southwest Louisiana. Each province, linked to a discrete source region, represents...mineral provinces have been identified. The Northern Province (NP), drained by the lower reaches of the...the east represent the Red River Province (RRP) with dominant epidote, tourmaline, garnet, and zircon...them in kyanite and staurolite. The Mississippi Province (MP) occupies the easternsoutheastern area of...alluvium is dominated by hornblende, pyroxenes, and epidote, as the result of post-depositional dissolution |
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| Anorthosites in the Colony Complex near Freetown, Sierra Leone. By M. K. Wells, M.Sc., Ph.D., and C. 0. Baker... • COLONIAL GEOLOGICAL ABSTRACTS Part 11. Sierra Leone • • BOOK REVIEWS The Birth and Development...Illustrations • Anorthositesnear Freetown, Sierra Leone Plate I Plate II Plate III Text-fig. 1 Text-fig... or Monomo, Anorthosite Photomicrographs of Sierra Leone Anorthosites '' Rhexoxylon and Dadoxylonfrom...ANORTHOSITES IN THE COLONY COMPLEX NEAR FREETOWN, SIERRA LEONE By M. ~- WELLs, 1 M.Sc., Ph.D., and C. 0 |
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| Countries United Kingdom Ghana Kenya Malawi Rhodesia Sierra Leone Tanzania Uganda Zambia Canada India Australia...mining necessary at the Stjernéya occurrence in northern Norway. Mining operations in both Canada and Norway...known source of processed nephelinesyenite is in northern Norway where production began in 1961 and has...acceptance of Ontario nepheline-syenite by the northern States east of the Mississippi while its successful...coarse-grained trachytoid nephelinesyenite which forms the northern half and most of the eastern part of the hill |
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| orthopyroxenes, and magnetite). Hornblende, olivine, and epidote are subordinate. Sialic minerals are represented...hornblende. The upper part of the complex also includes epidote, garnet, chromite, zircon, apatite, sphene, and...distinguished in the Olyutorka terrane. The northern province mainly includes island-arc clinopyroxenes...also significant in the southern province. Like in the northern province, clinopyroxene is the major mineral...its share is substantially lower (24–40%). This province is also characterized by high contents of magnetite |
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| • • • • • • • 289 292 Kenya. Uganda Northern Rhodesia Nyasaland • • • • • • • • •...316 • • • • • 318 • • • • • 319 Sierra Leone • Federation of Malaya • British Territories...No. 3: '' The Chromiferous Ultrabasic Eastern Sierra Leone '' • • • • • Minerals and Mines in Africa •...and Baker Range 2. Northern range of Ruwenzori 3. Head of Wasa Valley, and Northern Range of Ruwenzori...Plate V Geological and Scenic Features . . 1. Northern Range with Mt. Karangora 2. Wasa Fault, Fort Portal-Bwamba |
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| provinces can be denned, based primarily on the epidote content. A close areal relationship between capes...anomalies, both minerals being better rounded in the northern portions of the study area. Roundness-distribution...staurolite, monazite, rutile, zircon, sillimanite, epidote, amphiboles and pyroxenes, opaques, and "others"...staurolite concentration (Fig. 2) are present. The northern anomaly is located on the shelf area between Cape...are isopleth maps showing the boundaries of the northern anomaly appear to be closely related to capes |
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| deposit (Mpumalanga Province), the Kalahari manganese field (Northern Cape Province) and the Rustenburg...Bushveld Complex (in North-West, Mpumalanga and Northern Provinces). Sixteen (16) of the valid species...Low-silica braunite Manganese-diaspore Manganese epidote Manganpickeringite Mathiasite (K) Molengraaffite...Ayalon, Israel (Gross et al., 1967) and Zeilbergs, northern Bavaria, Germany (Pollmann, 1991 ). Etymology:...Dorst Fontein K 77, Kimberley district, Northern Cape Province (Parry and Wright, 1925). The mineralwas |
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| divisible into two distinct provinces. A northern province includes all the Rhodesian basalt Iocalities...abnormally high for tholeiitic rocks. The southern province includes the basalts of Basutoland and Swaziland...of crystallisation. The rocks of the southern province are relatively aluminous, and plagioclase appears...aluminous northern province, pyroxene appears earlier than plagioclase. Within the northern province, three...textural features of the rocks. Within the northern province itself it is also possibleto find an GEOCHEMISTRY |
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| Complex of Sierra Leone. By C. 0. Baker, B.Sc., GeologicalSurvey Department, Sierra Leone, and M. H....GEOLOGICAL SURVEYS Uganda • • • Tanganyika • • Northern Rhodesia Nyasaland • • • Nigeria • • • British.... . . . Dixeyite-A New Mineral from Central Sierra Leone • Mineral Resources of East and Central Africa...Gravity Survey over the Freetown Basic Complex of Sierra Leone Fig. Observed gravity anomalies along the York...Bouguer Anomalies of the Freetown Peninsula, Sierra Leone . . . . . . . . . facing p. 2 78 1 Notes on |
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| Owing to the sluggishreaction behavior of the epidote minerals, these can serve as important petrogeneticindicators...range of bulk compositions. INrnolucrroN The epidote mineral group, Iike the pyfoxenesand feldspars...replaceslawsonite una u"o.tiltJu"i is common in many eclogites;epidote -i"".ufr'u." "U+ uitous in mafic rocks throughout...throughout the blueschisi, fi";schist, and epidote amphibolite facies; and ,"iri;;;; clinozoisite both occur...high-Fe epidote sampleshave not been reported coexistingwith an orthorhombic member of the epidote seriesand |
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| Bumbuna, Sierra Leone. By Vladi Marmo, Dr. Ph. (Helsinki), GeologicalSurveyDepartment, Sierra Leone . . ...SURVErs Kenya • • • • • • • Uganda • • • • • • • Northern Rhodesia • • • • • Nyasaland • • • • • • • Bechuanaland...an Elliptic D,:ainageSystem North of Bumbuna, Sierra Leone Plate I Panoramic View of Area North of Bumbuna...Upper Cretaceous mollusc fauna collected from the Northern and Eastern Regions of Nigeria. A paper on the...the town of Afikpo, in Afikpo Division of Ogoja Province. The Afikpo localities mentioned in the descriptive |
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| • • • • 59 • • • • • • • • • • Northern Rhodesia Nyasaland • • Somaliland • • •...in Borneo • • • • • • • 72 Cyprus Sierra Leone Federation of Malaya • • • • • • • ...Thorium . • • • 89 Mineral Production in Northern Rhodesia • • • • 90 • • • 91 • 91 ...that benefited Northern Rhodesia and Cyprus in particular. The 1954 production of Northern Rhodesia exceeded...photographs indicated that southern Nyasaland for1ned a province of ring structures, intrusions, and dyke swarms |
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| . Uganda • Tanganyika . • • • • • • Northern Rhodesia • • • . 44 • • • • • • 59...• 76 Cyprus • Nigeria • Gold Coast . Sierra Leone Federation • of Malaya • • • • • • ...of £5 millio11 and £1 million respectively. In Northern Rhodesia, production increased by 1 • 2 EDITORIAL...exported in-creased although the tonnage fell; Sierra Leone (£0·8 million), because of larger iron-ore shipments...the ocean floor. These now s11rround all but the northern portion of the island. The series consists of |
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| SURVEY'S Kenya • • • Uganda . • Tanganyika • • Northern Rhodesia • Nyasaland . • • . 4 • • •...pointing upwards. + Theoretical dipole field in the northern hemisphere. * Theoretical dipole field in the...of the Columbia River basalts in Washington and northern Oregon." J . geophys. Res., Vol. 61, No. 3, pp...by L. D. Sanders and Dr. E. P. Saggerson, from Northern Rhodesia by H. Gair, from Bechuanaland by D. Green...(Lower) SOUTHERN RHODESIA Basalts, Bulawayo NORTHERN RHODESIA Basalts, Victoria Falls BECHUANALAND |
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| The Lead-Zinc-Vanadium Deposits at Broken Hill, Northern Rhodesia. By James H. Taylor, Ph.D., M.I.M.M....• 407 COLONIAL GEOLOGICAL ABSTRACTS Part 5.-Northern Rhodesia . • • BOOK REVIEWS Geochemistry...The Lead-Zinc-Vanadium Deposits at Broken Hill, Northern Rhodesia Plate I Photomicrographs of Rocks from... THE LEAD-ZINC-VANADIUM DEPOSITS AT BROKEN HILL, NORTHERN RHODESIA By JAMES H. TAYLOR, Ph.D., M.I.M.M. Professorof...the more usual hemimorphite. Introduction in Northern Rhodesia lies about 70 miles N by E of the capital |
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| • • 332 NOTES Source Rock of Diamonds in Sierra Leone and French Guinea. Drs. D. R. Grantham and J.... . . ,, 274 Plate VII Guma Water Dam Site, Sierra Leone. Geological Map and Section . . . . . . 280...280 .,' Plate VIII K.afue Hydro-Electric Scheme, Northern Rhodesia. Plan of Tunnel Alignments and Power... . '' Geological Section through Kafue Gorge, Northern Rhodesia . . . . . . '' Physiographical Features...OF Gold Coast . Sierra Leone . Nigeria . . Uganda . . Kenya . . Tanganyika . Northern Rhodesia Southern |
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| AT THE IMPERIAL INSTITUTE Black Pepper from Sierra Leone. By G. T. Bray, F.R.I.C., and F. Major, B.Sc...ABSTRACTS AND NOTES Obituary-Miss R. C. Groves, 54 ; Sierra Leone Produces World's Largest Alluvial Diamond, 55...and Colon,iaZ Governments BLACK PEPPER FROM SIERRA LEONE By G. T. BRAY, F.R.I.C., and F. MAJOR, B.Sc...pepper have been carried out in various parts of Sierra Leone and have shown that the crop can be grown successfully...United States and Australia. TRIALS • Sierre Leone Sample. Moisture • Ash, total . pe,r cent. U |
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| 2) Late Precambrian to Early Paleozoic 20 f) Northern Sudan 21 g) Eastern Sudan and Sabaloko inlier...- Alluvial gold occurrences 37 J - Kordofan Province 37 Origin and age of gold 37 •^ 2 - BERYL...area 43 B - Berber area 43 C - Upper Nile Province 43 8 - MOLYBDENUM 44 9 - LEAD - ZINC 44 ...distribution all over the country. Studies carried out in northern Uganda, Kenya and Zaire indicated that relict...the Kurmut Series are exposed in the eastern and northern parts of the Bayuda area. They are well foliated |
