 | | Report (issue) | | SURVEY NAMIBIA 1990 Open File Report MRS 12 2 Abstract Niobium-tantalum mineralisation in Namibia occurs...either as niobium-tantalum pentoxides of the columbite-tantalite series, or as niobium-tantalum minerals...of the pyrochlore group. Minerals of the columbite-tantalite series are associated with rare metal pegmatites...by-products of Tin-mining operations in central Namibia (Uis, Nainais, De Rust). Prominent niobium-tantalum...mineralised pegmatites occur in the Tantalite Valley in southern Namibia and have been mined for a long time |  | Graupner, T., Melcher, F., Gäbler, H.-E., Sitnikova, M., Brätz, H., Bahr, A. (2010) Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data. Mineralogical Magazine, 74 (4) 691-713 doi:10.1180/minmag.2010.074.4.691 | Journal (article/letter/editorial) | | 691–713 Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data T. GRAUPNER1,*...concentrations and distribution patterns of columbite-tantalite minerals from Ta-ore provinces worldwide...chondritenormalized REE distribution patterns are defined for columbite-group minerals (CGM) from lithiumcaesium-tantalum...during progressive evolution of the melt in a pegmatite body (either Nb ? Ta or Fe ? Mn fractionation...tool). K EY WORDS : LCT family pegmatites, columbite-tantalite, REE geochemistry, LA-ICP-MS data. Introduction |  | | Journal (article/letter/editorial) | | from carbonatites and peralkaline igneous rocks. Columbite-group minerals (CGM) account for the majority...and the Jos Plateau (Nigeria); Mn-rich columbite-tantalite is typical of the Alto Ligonha Province (Mozambique)...Shield (Egypt, Ethiopia) and the Tantalite Valley pegmatites (southern Namibia) and Large compositional variations...Nigeria and many pegmatites in the Damara Belt of Namibia. Trace element concentrations in CGM and other...Fetherston, 2004; Melcher et al., 2015). Central-East African countries have an almost 100-year-long history |  | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, Oberthür, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | | Neoproterozoic (1000-542 Ma) TE 4.3.1. Kibara Belt (east-central Africa) 4.3.1.1. Radiometric data CE P...(western Zimbabwe) 4.3.3. Orange River Pegmatite Belt (Namibia, South Africa) AC 4.3.3.1. Radiometric...Radiometric data 4.4.3.2. Mineralogy 4.4.4. Damara Belt (Namibia) 4.4.4.1. Radiometric data 2 ACCEPTED MANUSCRIPT...Mineralogy NU 5. Mineral chemistry of columbite-tantalite, tapiolite, wodginite and ixiolite in African...3.2. Kamativi Schist Belt 5.3.3. Orange River Pegmatite Belt 5.4. Late Neoproterozoic to early Paleozoic |  | | Book | | REPUBLIC OF NAMIBIA - MINISTRY OF MINES AND ENERGY GEOLOGICAL SURVEY THE MINERAL RESOURCES OF NAMIBIA FIRST...ENERGY Of the several hundred minerals present in Namibia, around sixty have been exploited. some, such as...base metals and industrial minerals have helped Namibia rank amongst the top five mining countries in Africa...terms of production and reserves. In this context, Namibia is a major producer of copper, lead, zinc, cadmium...unpublished. It is evident that mineral exploration in Namibia, as elsewhere. has changed from serendipitous discoveries |  | | Book | | Mountainland The Central Northern to Northwest Region including Damaraland The Central Namib Desertand...Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and the Diamonds 44 49 241 254 272 275... Encyclopedia of the Mineralsof Namibia 443 Meteorites in Namibia Bibliography Index Photo credits...__ Republic of Namibia The President State House W°Ntdhoek FOREWORD Namibia is endowed with an...from near and far. Fine mineral specimen from Namibia are displayed in all the famous natural science |  | | Report (issue) | | Pegmatite Investigations 1942-1945 Black Hills, South Dakota By LINCOLN R. PAGE and OTHERS GEOLOGICAL...mine by R. F. Stopper!, ______---__ Hardestey Homestead mine by L. R. Page and .J.B.Hanley.--------------______-__...prospect by W. E. Hall_ Homestead No. 2 mica prospect by J. J. Norton. ___ Homestead No. 3 mica prospect...mica claim.__________________________ Pleasant Valley mine by J. W. Adams and Peter Joralemon ______...pocket] PLATE 1. Index map showing locations of pegmatite mines and prospects. 2. 3. 4. 5. 6. 7. 8. 9. |  | | Book | | prospecting within the limits of the beryl-bearing pegmatite field, Prospecting for non-pegmatitic beryllium...1951 48 18 = 40 == — == == — = Brazil British East Africa 903 — 655 = 2960 10 2451 10 992 43 ...extremely low (Brazil, South-West Africa, Portuguese East Africa, etc.), or whenever total exploitation of...Paragenesis Beryl is equally characteristic of the pegmatite and of the hydrothermalpneumatolytic deposits...with the common association of extensive beryl pegmatite fields with intrusions of biotite granites characterized |  | | Report (issue) | | Helpful suggestions on field occurrences and pegmatite mineralogy were received horn Dr. James J. Norton...(130, columbite) (201, columbite) (011, rutile) (101, trlphylite, metastrengite) (111 columbite) (120...(120 arsenopyrite) (150 columbite) Symbol t X 0 n f s 8 p ( 1 Cl Face or Form (012, wardite) (2134...apatite) (ill, augelite) hhl, tetragonal (131, columbite) (111, augelite) (201 , augelite) (011, ferberitel...Topographic maps are available for all of the Black Hills region and may be purchased from the United States Geological |  | | Report (volume) | | siltstone of Triassic age, bounded by normal faults. An east-trending fault of indeterminate age probably offset...similar to the main part of the body. This type of pegmatite is of limited economic value. About 25 percent...center of the pegmatite. As many as five distinct units, or zones, parallel to the pegmatite wall-rock contact...contact have been noted in an individual pegmatite. In some pegmatites fracture-filling units of quartz...mica of the rock. The average beryl content of pegmatite rock in the Middletown area is probably between |
|
