 | | Journal (article/letter/editorial) | | Mineralization in Peralkaline Granites from the Amis Complex, Brandberg (Namibia): Evidence for Magmatic Pre-enrichment...Germany Abstract The Amis Complex is a late intrusive phase associated with the Brandberg anorogenic granite...of the Amis Complex, Namibia, which is a satellite intrusion of the Early Cretaceous Brandberg anorogenic...of postmagmatic element redistribution in the Amis Complex. Mass-balance calculations that were performed...roofward enrichment. Geology of the Amis Complex Geologic setting The Brandberg massif (Daureb in the local Damara |  | | Book | | AiAiba / farm Anibib 136 8 Grosse Spitzkoppe, Erongo 9 , .,/, loringa tree . Khomas Highland...station Garub near Aus Nature conservation, Erongo 16 Welwitschia, Goboboseb Mountains 17 ....Northwest Region including Damaraland The Central Namib Desertand Escarpment The Spitzkoppen The Erongo Mountains...The Central Escarpment- The Nauchas-Gamsberg-Hakos Area West and South of Rehoboth The Central and South-CentralDeposits...Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and the Diamonds 44 49 241 254 272 275 |  | | Journal (article/letter/editorial) | | complexes and associated mineralisation in Namibia (Brandberg and Erongo) related to the opening of the South...Mount Weld and Gifford Creek ferrocarbonatite complex in Western Australia, the controversial Bayan Obo...events. The causes and mechanisms of rifting are complex and are beyond the scope of this contribution,...magmatic systems and carbonatites from Namibia (Brandberg, Erongo), South Africa (Kruidfontein, Goudini)...Goudini), Western Australia (Mount Weld and Gifford complex) and China (Bayan Obo and the carbonatites of the |  | | Journal (article/letter/editorial) | | Gross Spitzkoppe and Klein Spitzkoppe stocks in Namibia: Topaz-bearing A-type granites related to continental...Geological Survey of Namibia, P.O. Box 2168, 1 Aviation Road, Windhoek, Namibia c Rosh Pinab Zinc Corporation...Corporation (Pty) Ltd, P.O. Box 115, Rosh Pinab, Namibia Received 3 February 2006; accepted 4 December...The anorogenic Damaraland intrusive complexes in Namibia belong to the bimodal Paraná–Etendeka Large Igneous...in the Gross Spitzkoppe, Klein Spitzkoppe, Erongo, Brandberg, Messum, Cape Cross, and Paresis complexes |  | Bernard, Cyrielle, Estrade, Guillaume, Salvi, Stefano, Béziat, Didier, Smith, Martin (2020) Alkali pyroxenes and amphiboles: a window on rare earth elements and other high field strength elements behavior through the magmatic-hydrothermal transition of peralkaline granitic systems. Contributions to Mineralogy and Petrology, 175 (9). doi:10.1007/s00410-020-01723-y | Journal (article/letter/editorial) | | and Manongarivo (Donnot 1963) in Madagascar, Amis in Namibia (Schmitt et al. 2002), Evisa in Corsica (Bonin...of in-depth studies, such as the Strange Lake complex which was first studied in the late 1980’s (e.g...Ma Evisa Post-orogenic extension or rift 290 Ma Amis Rift 130 Ma Ambohimirahavavy Rift- 25 Ma Manongarivo...poorly known, as is the case for the Manongarivo complex, for which the only available information is a...additional late hydrothermal event (identified at Amis, Evisa, and Strange Lake). The composition of the |  | | 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 |  | | Journal (article/letter/editorial) | | potassium feldspar, albite, tuhualite, titanite, fluorite, and diverse rare-metal phases, including minerals...neck); (10) country rocks: granite and ophiolite complex; and (11) fault. The massif is part of a group... tantaloniobates, fluorocarbonates, etc.) and fluorite. The rocks show a porphyritic texture and contain...composition. Albite, quartz, gittinsite, zircon, fluorite, and other minerals were observed in the interstices...analyzed by rastering the electron beam over an area of 12 × 12 or 5 × 5 μm. Daughter minerals in inclusions |  | THOMAS, R, WEBSTER, J, RHEDE, D, SEIFERT, W, RICKERS, K, FORSTER, H, HEINRICH, W, DAVIDSON, P (2006) The transition from peraluminous to peralkaline granitic melts: Evidence from melt inclusions and accessory minerals. Lithos, 91 (1) 137-149 doi:10.1016/j.lithos.2006.03.013 | Journal (article/letter/editorial) | | Nb-tantalite, zircon, monazite, xenotime, REE-rich fluorite and other phases. Borax [Na2B4O5(OH)4⁎8H2O] is...Nb-tantalates, bismuth, bismuthine, hematite, REE-rich fluorite, topaz, albite, zircon, monazite, and xenotime...interpretation of the late-stage evolution of a complex granitic system (Fig. 5). Starting from the critical...(> 50– 100 μm in diameter) of cryolite, topaz, fluorite, and albite crystals in quartz, reflecting strong...example by the frequently occurring Y-REE fluorite in the region. In Zinnwald, this mineralization type |  | | Journal (article/letter/editorial) | | species, together with differences in the source region, and variations in pressure and temperature cause...formation of pegmatites is connected with the complex interplay of many factors. Introduction This contribution...certainly the most probable one in the case of most complex pegmatite fields, even recognizing that metasomatic...important to note that even in regions containing complex rare-element rich pegmatites, simple pegmatites...Thus any model needs to explain both simple and complex pegmatites if it is to be of any utility. Our results |  | | Journal (article/letter/editorial) | | peralkaline granitic pegmatite from the Amis complex (Namibia) for which data on the composition of the...rare earth elements, Nb, Zr and Ti minerals and fluorite (Table 1). In the hypersolvus granites, the primary...primary zircon. There are no primary Ti minerals. Fluorite is common, particularly as blebs, interpreted...texture. The primary Ti mineral is narsarsukite. Fluorite is commonly observed either as bleblike inclusions...gagarinite-(Ce). As in hypersolvus granites, the fluorite is interpreted to have crystallised from a fluoride |  | Huang, He, Wang, Tao, Zhang, Zhaochong, Li, Chao, Qin, Qie (2018) Highly differentiated fluorine-rich, alkaline granitic magma linked to rare metal mineralization: A case study from the Boziguo’er rare metal granitic pluton in South Tianshan Terrane, Xinjiang, NW China. Ore Geology Reviews, 96. 146-163 doi:10.1016/j.oregeorev.2018.04.021 | Journal (article/letter/editorial) | | Tianshan Terrane (STT). The STT is considered as a complex accretionary orogenic belt, which was formed by...Autonomous Region (Fig. 1b). The major sedimentary-volcanic sequences preserved in the study area include...member, exposed in the northern segment of the study area, is dominated by low grade metamorphic rocks including... which occupies the middle segment of the study area and was intruded by the studied Boziguo’er pluton...southwestern and southeastern segments of the study area. The formation is lithologically composed of a series |  | Li, Ao, Yang, Wu-Bin, Niu, He-Cai, Shan, Qiang, Jia, Chun (2021) Mineralogy and U–Pb geochronology of REE fluorocarbonates from the Gansha Obo REE deposit, northwest China. Ore Geology Reviews, 136. 104266pp. doi:10.1016/j.oregeorev.2021.104266 | Journal (article/letter/editorial) | | Cretaceous Gansha Obo alkalin e–carbonatite igneous complex. In this study, we present a detailed investigation...dating of such minerals can produce variable and complex results that require careful interpretation. REE...deposit hosted in an alkaline–carbonatite igneous complex in northwestern China, with REE2O3 reserves of...of Paleozoic age are widely distrib uted in this area (Fig. 1B) and can be divided into two series (Huang...location of the Gansha Obo REE deposit. (A) The study area on the northeastern margin of the Tibetan Plateau |  | | Journal (article/letter/editorial) | | Simplified geological map of the Cretaceous Xiangshan complex, where the arfvedsonite granites are surrounded...LA-ICPMS. Geological background The Xiangshan complex crops out over 217 km2 in the NNEtrending Yanshan...minerals mainly consist of zircon, magnetite, sphere, fluorite, and rutile. The quartz is subhedral to anhedral...contrast, the biotite granite on the marginal of the complex is porphyritic-like, with 15–30 vol% phenocrysts...granite from the central part of the Xiangshan complex. The occurrence of alkali-feldspar and sodic-amphibole |  | | Journal (article/letter/editorial) | | related to the pseudobinary MA solvus form a complex assemblage, but all melt inclusions on that solvus... Data are from the Variscan Ehrenfriedersdorf complex, the critical point in TE this case 720°C (Thomas...numerous granites and pegmatites (including both complex and simple pegmatites) world-wide. Cold- NU seal...supercritical, and to some IP extent the near-critical region, have consistent but extreme behavior. This data...and the behavior of some elements in the critical region T The general results collated from several studies |  | | Journal (article/letter/editorial) | | calcium metasomatism, hematisation and hydrothermal fluorite. We also suggest that, even where these criteria...mineralisation in the Ilímaussaq nepheline syenite complex, Greenland (Sørensen, 1992), and the zones of Zr–Nb–Y–REE...minerals in miarolitic cavities (e.g., the Evisa complex, Corsica; Bonin, 1988), and as trapped solids or...bastnäsite (Strange Lake complex; Salvi and Williams-Jones, 1990) and zircon (Tamazeght complex, Morocco; Salvi..., 2005; Beeskow et al., 2005), the Ilímaussaq complex, Greenland (e.g., Petersilie and Sørensen, 1970; |  | Sun, Yi, Lai, Yong, Chen, Jing, Shu, Qihai, Yan, Cong (2013) Rare Earth and Rare Metal Elements Mobility and Mineralization During Magmatic and Fluid Evolution in Alkaline Granite System: Evidence from Fluid and Melt Inclusions in Baerzhe Granite, China. Resource Geology, 63 (3) 239-261 doi:10.1111/rge.12007 | Journal (article/letter/editorial) | | stocks and several unexposed dikes. The exposed area of the east body is 0.3 km2, and the west body is...a coarse-grained to megacryst texture. Our study area (east body in Fig. 1c) is the main orebody of the...were similar to REE-rich fluorite but lacked the most important peaks of fluorite in 310–325 cm-1 (Fig....ppm (Webster & Rebbert, 2001); those from the Amis Complex contain max Nb = 3680 ppm, Zr = 19940 ppm (Schmitt...peralkaline granite host Nb–Ta–REE deposits in Amis Complex (Schmitt et al., 2002) suggested that the translation |  | | Journal (article/letter/editorial) | | 2001; Yang et al., 2014), the Bokan Mountain complex in ur Southeastern Alaska (Thompson et al., 1982;...in H2O-rich systems of such as Strange Lake and Amis, arfvedsonite is the major ferromagnesian mineral...principle, the Ca-fluoride phase could be either fluorite or a fluoride liquid. Experimental data of Yang...silicate melts exsolve a fluoride liquid from which fluorite crystallises (Fig. 7b). This prior generation...conclude, as have Yang and van Hinsberg (2019), that fluorite in A-type granites, which is interpreted to be |  | | Journal (article/letter/editorial) | | whole-rock geochemical data and the presence of fluorite, increased the solubility of monazite and xenotime...This mineralogical diversity, in addition to the complex geological history of the pluton, provides a unique...their formation conditions are still limited. The complex geological history of this pluton provides a unique...Pluton. (b) Geological map of the Wentworth pluton area showing the geographic distribution of the studied...faults (Koukouvelas et al. 2002). The plutonic complex was compartmentalized into smaller blocks with |  | Gronen, Lars Hans, Sindern, Sven, Katzmarzyk, Janet Lucja, Bormann, Udo, Hellmann, André, Wotruba, Hermann, Meyer, F. Michael (2019) Mineralogical and Chemical Characterization of Zr-REE-Nb Ores from Khalzan Buregtei (Mongolia)—Approaches to More Efficient Extraction of Rare Metals from Alkaline Granitoids. Minerals, 9 (4) 217 doi:10.3390/min9040217 | Journal (article/letter/editorial) | | alkaline rocks is in line with elevated abundances of complex and rare HFSE minerals, which have attracted both...hydrothermal processes frequently leads to narrow and complex intergrowths of fine grained and irregularly sized...the complex [5,12–15], detailed sampling work was carried out in the central part of the complex, which...geologists of the former Soviet Union [13]. The complex covers an area of 30 × 8 km and is mainly built up by...activity as well. Major faulting of the working area postdates the ore formation indicated by the displacement |  | | Journal (article/letter/editorial) | | 5 wt% REE) in the peralkaline Amis granite Complex, Brandberg, Namibia (Schmitt et al., 2002). Although... (2013) showed that in the Loch Loyal syenite complex, Scotland, magmatic concentration of the REE in...diorites and granitoids of the 1353–1290 Ma Nain complex and finally by silica under- and over-saturated...6244000 36 Strange Lake pluton 6242000 Pegmatite Fluorite Breccia Hypersolvus granite Dark porphyritic granite...astrophyllite), both of which replaced arfvedsonite. Fluorite is a common accessory mineral that is either disseminated |  | Yang, Wu-Bin, Niu, He-Cai, Li, Ning-Bo, Hollings, Pete, Zurevinski, Shannon, Xing, Chang-Ming (2020) Enrichment of REE and HFSE during the magmatic-hydrothermal evolution of the Baerzhe alkaline granite, NE China: Implications for rare metal mineralization. Lithos, 358. 105411 doi:10.1016/j.lithos.2020.105411 | Journal (article/letter/editorial) | | The Late Mesozoic Great Xing’an Range covers an area of ca. 100,000 km2 (Ying et al., 2010), and is mainly..., 2015). Geology and zonation of the Baerzhe complex Journal Pre-proof The Baerzhe peralkaline granite...and can be found at the NE and SE margins of the complex, in contact with Jurassic volcanic tuff, and as...(zone IV) occurs at the bottom of the Baerzhe complex. The hypersolvus granites are fine- grained and...apatite, K-feldspar, columbite, aegirine, and fluorite (Yang et al., 2014). They are transparent and |  | Wang, Hong, Tang, Yong, Xu, Yu-Sheng, Zhang, Hui, Lv, Zheng-Hang, Qin, Shan-Xian, Song, Ying-Wei (2021) Textures and Chemical Compositions of Nb-Bearing Minerals and Nb Mineralization in the Shuangshan Nepheline Syenite Pluton, East Qinling, China. Minerals, 11 (11) 1163 doi:10.3390/min11111163 | Journal (article/letter/editorial) | | +86-851-84394846 Abstract: The Shuangshan alkaline complex located in the Henan province of China is a newly...enrichment of Nb is limited. Keywords: alkaline complex; Nb deposit; pyrochlore; zircon; alteration Massimo...and eudialyte [7,13,14]. The Shuangshan alkaline complex located in the Henan province of China is a newly...Dong and Santosh [18]. The Shuangshan alkaline complex, which comprises a series of alkaline silica- undersaturated...granite, hosts the Shuangshan Nb deposit. This complex, located in the eastern margin of the S-NCB and |  | Yang, Wu-Bin, Niu, He-Cai, Shan, Qiang, Sun, Wei-Dong, Zhang, Hong, Li, Ning-Bo, Jiang, Yu-Hang, Yu, Xue-Yuan (2014) Geochemistry of magmatic and hydrothermal zircon from the highly evolved Baerzhe alkaline granite: implications for Zr–REE–Nb mineralization. Mineralium Deposita, 49 (4) 451-470 doi:10.1007/s00126-013-0504-1 | Journal (article/letter/editorial) | | mineral inclusions. The occurrence of aegirine and fluorite in the recrystallized melt inclusions hosted in... 1b). The late Jurassic volcanic rocks in this region consist of andesite, andesitic tuff, and intermediate–felsic...et al. 2009). The Baerzhe pluton has an outcrop area of about 0.4 km2 and intruded the late Jurassic...K feldspar, Fe oxide, columbite, aegirine, and fluorite (Fig. 4a). As shown in the Raman spectra for the...0.8 0.7 32.7 10 Fe-oxide 18.4 0.2 5.9 63.9 11 Fluorite 0.5 bdl bdl bdl 12 Columbite 21.8 0.5 6.7 38.1 |  | | Journal (article/letter/editorial) | | (Salvi and Williams-Jones, 1990) and the Tamazeght complex in Morocco 325 (Salvi et al., 2000) provide direct...intrusions in other parts of the world, notably, the Amis (Namibia), Tamazeght (Morocco) and Khan Bogd (Mongolia)...1997) mid-Proterozoic intrusion extending over an area of 35 km2 on the border between Québec and Labrador...429000 300 km SW A Lithology STRANGE LAKE UNITS Fluorite Breccia Domain-I Hypersolvus Granite Unaltered...Monzonite Aegirine Arfvedsonite Zirconosilicates Fluorite vein Hematite vein Fig. 1. (a) Geological map |  | Ryzhenko, B. N., Kovalenko, N. I., Prisyagina, N. I., Starshinova, N. P., Krupskaya, V. V. (2008) Experimental determination of zirconium speciation in hydrothermal solutions. Geochemistry International, 46 (4) 328-339 doi:10.1134/s0016702908040022 | Journal (article/letter/editorial) | | hydrolyzed in aqueous solutions to form polymers and complex ions. The sta4–n bility constants of hydroxo Zr...identified during the investigation of an alkaline rock complex as a daughter mineral in fluid inclusions trapped...the 0 possibility of formation of the Zr Cl 4 complex, whose 0 ionization constant (Zr Cl 4 = Zr4+ +...the reaction of formation – of the Zr ( OH ) 5 complex is pK° = 4.39. Similar to the above-described systems...10–4 and 10–2 m (from the quartz–wollastonite–fluorite buffer to equilibrium with F-rich biotite) and |
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