 | | 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...melt, such as monazite, allanite, titanite, or zircon, is inhibited in peralkaline melts until the latest...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 |  | | 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 |  | | 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 |  | 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 |  | | Journal (article/letter/editorial) | | uncertainty) is concordant with the 23 +7/–6 ka U-Th zircon ages for the same sample. By contrast, AM206 pyrochlore...carbonatite from Greenland to be concordant with zircon, baddeleyite, and perovskite U-Pb ages. * Present...analyzed pyrochlore from the Cretaceous Amis peralkaline granite (Namibia). The large range of U and Th concentrations...sample [564-L; Liebsch (1996)] that yielded a U-Th zircon age of 23 +7/–6 ka (Wetzel 2009). This specimen...pyrochlore AM206 from the Early Cretaceous Amis Complex (Namibia; Schmitt et al. 2002) that is nominally |  | | 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) | | analytical data from melt inclusions has created a major area of disagreement among pegmatite researchers, and...typical for the Variscan granites in the studied region. Due to the apparent complexity, however, this...disassociation) and the bands at the high-frequency region (a — before and b — after disassociation). After...peak width of 248 cm − 1 in the high-frequency region (2800–4000 cm − 1, Fig. 1). This band corresponds...Tadschikistan; Spitzkopje and Amis Complex, Namibia; Alto Ligonha region, Mozambique; and Reinbolt Hills |  | | Journal (article/letter/editorial) | | rare-metal phases, including minerals of zirconium (zircon and gittinsite), niobium (pyrochlore), and rare...silicate glass, some inclusions contained tiny quench zircon crystals confined to the boundary of inclusions...which indicates that the melts were saturated in zircon. In a few inclusions, glass coexisted with a CO2...neck); (10) country rocks: granite and ophiolite complex; and (11) fault. The massif is part of a group...peralkaline granitoid pegmatoids and metasomatic quartz–zircon–orthite–epidote rocks replacing such pegmatoids |  | 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) | | (Sauberg) mine, steeply dipping, ≤ 10-cm-thick, zircon-rich beryl-quartz veins in the country rock only...length), huebnerite, wolframoixiolite, Nb-tantalite, zircon, monazite, xenotime, REE-rich fluorite and other...accessory minerals (uraninite, monazite, xenotime, zircon, cassiterite) of the peraluminous melt evolution...Tables 2a and 2b. Table 2a Composition (wt.%) of zircon crystallized from peraluminous type-A melt and...bismuthine, hematite, REE-rich fluorite, topaz, albite, zircon, monazite, and xenotime. It clearly shows a pegmatitic |  | | Journal (article/letter/editorial) | | 655–665, 2017 Chemical lattice expansion of natural zircon during the magmatic-hydrothermal evolution of A-type...well-documented nature of crystals, including zircon and zircon-type minerals, chemical lattice expansion...comprehensive investigation on three types of natural zircon that records the evolution of the granitic system...thermal expansion. Prismatic and oscillatory-zoned zircon grains (Type-1A), crystallized early in the granitic...= 6.603 Å, c = 5.971 Å). Prismatic and altered zircon grains (Type-1B), formed under volatile-saturated |  | 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) | | %), with accessory minerals at least including zircon, monazite, pyrochlore, Fe-Ti oxides, xenotime,...pluton are mainly contained by pyrochlore (Nb-Ta), zircon (Zr-Hf, Th-U and HREE) and monazite (LREEs) grains...four types of zircons have been identified. Type-I zircon may have crystallized from * Corresponding author... volatile-undersaturated early-stage magmas, while type-IIA zircon crystallized from volatile (fluorine)-saturated...stage. Key words: Rare metal granite; Fluorine; Zircon; Magmatic differentiation 1. Introduction Although |  | | Journal (article/letter/editorial) | | peralkaline granitic pegmatite from the Amis complex (Namibia) for which data on the composition of the...crystallised early. Zirconium also crystallised early, as zircon euhedra, and later, as the alkali zirconosilicate...dalyite, which commonly contain relicts of primary zircon. There are no primary Ti minerals. Fluorite is...to the hypersolvus granites, there is no primary zircon in the transsolvus granite. Instead, the primary...(melt inclusions) have been measured is the Amis pluton in Namibia (Schmitt et al., 2002). In the paragraphs |  | | 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 (issue) | | island. The eontribution of Birkenmajer deseribes a region not very familiar in literature. He gives a review...ductile middle erust. Estimates of shortening based on area balaneing are again of the order of slightly more...transmission of seismic energy through the tectonically complex overlying section (Fig. 3). 239 100 km Basel...ofIvrea (crossed ruling); CRL = Cremosina line complex, bounding the Ivrea-Ceneri body (narrow horizontal...Helvetic nappes and the External Massifs is similarly complex, yet did not produce a comparable effect, and that |  | | 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 |  | Jiang, Neng, Sun, Shihua, Chu, Xuelei, Mizuta, Toshio, Ishiyama, Daizo (2003) Mobilization and enrichment of high-field strength elements during late- and post-magmatic processes in the Shuiquangou syenitic complex, Northern China. Chemical Geology, 200 (1) 117-128 doi:10.1016/s0009-2541(03)00162-1 | Journal (article/letter/editorial) | | post-magmatic processes in the Shuiquangou syenitic complex, Northern China Neng Jiang a,b,*, Shihua Sun a...April 2003 Abstract The Shuiquangou syenitic complex consists of melasyenite and leucosyenite. In the...the northeastern part, there is a small area where the leucosyenite was affected by alteration. The altered...(HFSE); Hydrothermal mobility, Shuiquangou syenitic complex; China 1. Introduction The high-field strength...Petrogenetic studies of the Shuiquangou syenitic complex show that the concentrations of high-field 0009-2541/03/$ |  | | Journal (article/letter/editorial) | | Magmatic minerals like allanite-(Ce), chevkinite-(Ce), zircon, and hingganite-(Y) and post-magmatic mineral phases...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...(Pe-Piper et al. 2004; Murphy et al. 2011), whereas a zircon sample from the HLBL granite has yielded a U-Pb |  | 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...minerals that are commonly used for dating (e.g., zircon). With the rapid development of new dating techniques...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 |  | Wang, Lize, Xu, Cheng, Zhao, Zheng, Song, Wenlei, Kynicky, Jindrich (2015) Petrological and geochemical characteristics of Zhaibei granites in Nanling region, Southeast China: Implications for REE mineralization. Ore Geology Reviews, 64. 569-582 doi:10.1016/j.oregeorev.2014.04.004 | Journal (article/letter/editorial) | | characteristics of Zhaibei granites in Nanling region, Southeast China: Implications for REE mineralization...weathering profile of granitoid rocks from Nanling region of Southeast China is an important REE resource...Note that most Jurassic granitoids in the Nanling region contain no REE minerals and cannot produce REE...crust-derived REE deposits related to granitoids in Nanling region of Southeast China are rare because few granitoids...characteristics of Zhaibei granites in Nanling region, Southeast China: Implications for REE mineralization |  | | Journal (article/letter/editorial) | | 2001; Yang et al., 2014), the Bokan Mountain complex in ur Southeastern Alaska (Thompson et al., 1982;...Ivigtut), in which the Zr- and Ti-rich minerals are zircon and Ti-oxides, respectively. The other granites...in H2O-rich systems of such as Strange Lake and Amis, arfvedsonite is the major ferromagnesian mineral...Å) from bonding with silicon tetrahedra to form zircon, which raises the saturation level for Zr minerals...increase in the solubility of HFSE minerals, e.g., zircon and ilmenite, by several orders of magnitude (early |  | 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...and hematite (Fig. 3j). Ore minerals consist of zircon (ZrSiO4), pyrochlorite (CaNb2O6F), samarskite [(Y...evolution of minerals. common in albite aplite. Zircon has a rhombic section form in albite aplite with...some areas, porphyroid appeares as the core of zircon. The BSE images show that the columbite postdates |  | 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...element represented by 70 own minerals, among which zircon (ZrSiO4), baddeleyite (ZrO2), and eudialyte are...in alkaline rocks, and 1120 ppm in carbonatites. Zircon and baddeleyite are weathering resistant; they...starting ZrO2(baddeleyite). There is no doubt that zircon and baddeleyite are mostly magmatic minerals. However...rocks [3]. Hydrothermally redeposited baddeleyite, zircon, and zirconolite (CaZrTi2O7) occur in skarns 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) | | ARTICLE Geochemistry of magmatic and hydrothermal zircon from the highly evolved Baerzhe alkaline granite:...hosted by zircon, yttroceberysite, fergusonite, ferrocolumbite, and pyrochlore. Three types of zircon can be...magmatic, metamict, and hydrothermal. Primary magmatic zircon grains occur in the barren hypersolvus granite...recrystallized melt inclusions hosted in the magmatic zircon indicates that the parental magma of the Baerzhe...Baerzhe pluton is alkali- and F-rich. Metamict zircon grains occur in the mineralized subsolvus granite and |  | | Journal (article/letter/editorial) | | 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;...Strange Lake complex, Canada (Salvi and Williams-Jones, 1992), and the Tamazeght complex, Morocco (unpublished |
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