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| SURVEY NAMIBIA 1990 Open File Report MRS 12 2 Abstract Niobium-tantalum mineralisation in Namibia occurs...basement rocks of the Namaqualand Metamorphic Complex, and with rare metal pegmatites of late Namibian...by-products of Tin-mining operations in central Namibia (Uis, Nainais, De Rust). Prominent niobium-tantalum...pegmatites occur in the Tantalite Valley in southern Namibia and have been mined for a long time on a small...basement rocks of the N'amaqualand Metamorphic Complex 2.1.1 Tantalite Valley pegmatites 2.1.1.1 Witkop |
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| intrusives with and without associated carbonatite, Namibia B. Bühn a,b,*, R.B. Trumbull c a Institut fur...from the Cretaceous Damaraland igneous province (Namibia), one with and one without associated carbonatite...evolution. The Etaneno complex occurs in close spatial proximity to the Kalkfeld bimodal carbonatite –...– alkali silicate complex, and is dominated by nepheline (ne)-monzosyenites and ne-bearing alkali feldspar...cumulate component (nepheline, plagioclase). The Kalkfeld nefoidites (ijolites) and ne-syenites have 87Sr/86Sr(i) |
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| quartzitic country rocks of the Kalkfeld carbonatite complex, Namibia. The fluid inclusion population...relationship to the volatile-deficient, parental Kalkfeld carbonatite. Individual fluid inclusions display...this respect are similar to those of the parental Kalkfeld carbonatite, but are distinguished by a negative...carbonatitic fluid with the volatile-deficient, sövitic Kalkfeld carbonatite suggests that virtually all alkali...Rankin Fig. 1. Geological map of the Kalkfeld igneous complex (modified after Van Zijl, 1962), with |
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| resources of anorogenic alkaline complexes in Namibia: A review F. Pirajno a a Geological Survey of...resources of anorogenic alkaline complexes in Namibia: A review, Australian Journal of Earth Sciences:...resources of anorogenic alkaline complexes in Namibia: A review F. PIRAJNO Downloaded by [Dalhousie...Plain Street, East Perth, WA 6004, Australia. In Namibia there are numerous anorogenic alkaline complexes...carbonatites, mineralization, Namibia. INTRODUCTION In southwestern Africa (Namibia, southern Angola and northwestern |
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| aureoles: a case study from the Iivaara alkaline complex, Finland Sven Sindern b a,b,) , Ulrich Kramm...been investigated taking the Iivaara alkaline complex ŽFinland. as a case study. Five main fenitization...and unweathered fenites of the Iivaara alkaline complex, northern Finland, which were briefly described...Geological setting The Iivaara alkaline igneous complex is situated near Kuusamo, northern Finland, and...Province ŽKAP.. Magmatic activity in the Iivaara complex has been dated at c. 370 Ma similar to the ages |
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| African carbonatite complexes. Except for one complex analyzed for comparison (Okorusu), all other complexes...HC34 and a concomitant decrease in CaO. The Kalkfeld complex is Cretaceous in age, and belongs to a group...with the Damaraland magmatic province in northern Namibia (e.g., le Roex and Lanyon 1998). The samples were...The Ondurakorume complex is located close to the Kalkfeld complex in northern Namibia. Again, a suite...rocks is exposed (Prins 1981). In contrast to Kalkfeld, magnesiocarbonatite varieties with up to 13 wt% |
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| 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 |
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| Africa (Shirey et al., 2001) and the Lewisian complex in Scotland (Zirkler et al., 2012). Nevertheless...setting PT E D modelling. AC In the Tasiilaq region of South-East Greenland, the Nagssugtoqidian Orogen...the latter including the Ammassalik Intrusive Complex (Fig. 1; Kolb, 2014). PT The Schweizerland Terrane...2008). The calc-alkaline Ammassalik Intrusive Complex (AIC) to the south of the Kuummiut NU Terrane...al., 2008), the retrogressed eclogite contains complex mineral reaction textures SC and assemblages |
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| magmatism of the eastern margin of the Atlantic (Namibia, Angola) or the western African kimberlites do...Mafic-Ultramafic Magmatism in the Southwest Uganda Region of the African Rift: Implications from Experimental.... . . ... 3 The Crust Under the Canary Islands Region ............. 4 Network of Fractures and Identity...Identity of Vertical Movements in the Canary Islands Region ........................... 4.1 Transoceanic and......................... 5.1 The Thghouaji Ring-Complex ...................... 5.2 Conclusion ........ |
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| detailed geological survey of the Alné Island complex and announced his results in a series of papers...completed most of the field work on the Iron Hill complex of Gunnison County, Colorado, in 1912-1913. Although...fairly pure calcite (Garson and Smith, 1958). The complex was first studied by F. Dixey, and it was he who...detailed and complete studies of a carbonatitic complex. Between 1950 and 1956 there took place the most...presented by Leonardos (1956A, B). The Fen, Norway, complex has been restudied by Saether (1958); that of the |
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| third order administrative area, basin/formation/region(area)/deposit, and deposit/site name. Guano and...third order administrative area, basin/formation/region(area)/ deposit, deposit/site name, deposit type...information in the next two fields, .Basin/Fmt/Region (area)/Deposit and Deposit/Site_Name, is meant...Age, Host/Associated Lithology, Host Formation/Complex, Minerals, and Geologic Comments/Deposit Description...Yacimientos no metaliferos y rocas de aplicacion de la region Patagonia-Comahue: Argentina Ministerio de Economia |
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| simplest way to visualize the chemical composition of complex silicate materials is as a mixture of oxides: silicon...anorthite bytownite labradorite andesine oligoclase albite An100–An90 (also refers to the pure end-member...NaAlSi3O8). Solid solution in pyroxenes is more complex, so representing the composition of a pyroxene...be ignored. Garnet compositions are still more complex and require six end-members (Box 5.2). Such ‘formula...crystals containing more anorthite (CaAl2Si2O8) than albite (NaAlSi3O8) in molar terms (represented in symbolic |
