 | | 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...0.3 wt % Nb, 0.5 wt % total REE) are found in aegirine-albite aplites that formed around arfvedsonite...ppm). The REE, Zr, and Nb compositions of the aegirine-albite aplites plot along the same linear enrichment...values. The chemical and textural features of the aegirine-albite aplites are compatible with an origin by |  | | 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) | | K-Ar ages of the Brandberg and Okenyenyaigneous complexes, north-western Namibia Received: 10 August...intrusive units of the Brandberg and Okenyenya igneous complexes, northwestern Namibia, confirm the Early...contemporaneous, although the range of ages from Brandberg, 135.2 _+ 1.5 to 125.4 + 1.3 Ma, suggests a rather...0.7 Ma. The mean K - A r age of the Okenyenya complex is essentially equivalent to previously determined...dating of this complex (129.1-123.4Ma). K - A r chronology for the Brandberg complex is in conflict with |  | | 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) | | is always aegirine. Two types of aegirine were defined. In all complexes, type-I aegirine is zoned; its...bearing minerals and fluid inclusions. Type-II aegirine replaces amphibole and is oscillatory zoned. We...interpret the amphiboles and REE-rich cores of type-I aegirine to have grown during the magmatic stage, whereas...whereas the rims of REE-poorer type-I and II aegirine are formed during the hydrothermal stage. During magmatic...and Manongarivo (Donnot 1963) in Madagascar, Amis in Namibia (Schmitt et al. 2002), Evisa in Corsica (Bonin |  | | Journal (article/letter/editorial) | | mineral assemblage includes quartz, microcline, aegirine, arfvedsonite, polylithionite, a zirconosilicate...neck); (10) country rocks: granite and ophiolite complex; and (11) fault. The massif is part of a group...rocks with 35% potassium feldspar, 30% quartz, 9% aegirine, 1% amphibole, and up to 25% various rare-metal...potassium feldspar and smaller phenocrysts of aegirine and amphibole of the arfvedsonite composition...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) | | peralkaline melt fractions. The nepheline shows aegirine + kalsilite exsolution textures and a thin reaction...Ehrenfriedersdorf pegmatite. Nepheline shows kalsilite and aegirine exsolution lamellae. their MIs increase with...wt.%) of nepheline from a nepheline–kalsilite– aegirine exsolution and the kalifeldspar rim between nepheline...interpretation of the late-stage evolution of a complex granitic system (Fig. 5). Starting from the critical...the frequently occurring Y-REE fluorite in the region. In Zinnwald, this mineralization type occurs preferentially |  | | 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 |  | | 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) | | peralkaline granitic pegmatite from the Amis complex (Namibia) for which data on the composition of the...US albitised, and arfvedsonite was altered to aegirine ± hematite. Calcium metasomatism was pervasive...(melt inclusions) have been measured is the Amis pluton in Namibia (Schmitt et al., 2002). In the paragraphs...partition coefficients (Di) for the M4 site in the Amis arfvedsonite. The arfvedsonite from the sample (granitic...REE partition coefficients for the M4 site of the Amis sample were, therefore, modelled using D0, EM and |  | | Journal (article/letter/editorial) | | 2001; Yang et al., 2014), the Bokan Mountain complex in ur Southeastern Alaska (Thompson et al., 1982;...and/or clinopyroxene (typically arfvedsonite and/or aegirine). They also have high contents of halogens (especially...crystallisation path. For example, instead of aegirine, the main ferromagnesian mineral to crystallise...in H2O-rich systems of such as Strange Lake and Amis, arfvedsonite is the major ferromagnesian mineral...as those of Lovozero, Khibiny and Nechalacho, aegirine is the major ferromagnesian mineral re -p (Kogarko |  | 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) | | pseudomorphs, such as the replacement of arfvedsonite by aegirine, zircon pr dissolution and reprecipitation,...key economic minerals, including arfvedsonite, aegirine, zircon, hingganite-(Y) and monazite-(Ce), in...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...abundance of mafic minerals, i.e., arfvedsonite and aegirine, (2) rn al an increase in the average grain |  | 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 |  | 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) | | melt and mineral inclusions. The occurrence of aegirine and fluorite in the recrystallized melt inclusions... 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...20–30 vol% quartz, 20–25 vol% albite, 1–5 vol% aegirine, and minor arfvedsonite and zircon. Subhedral...vol% arfvedsonite, 8–12 vol% albite with minor aegirine and zircon. Major economic minerals of the Baerzhe |  | 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) | | arfvedsonite-bearing alkaline granite at the bottom, aegirine-bearing albite aplite in the middle and pegmatite...stocks and several unexposed dikes. The exposed area of the east body is 0.3 km2, and the west body is...arfvedsonite and aegirine, with a coarse-grained to megacryst texture. Our study area (east body in Fig...arfvedsonite (Fig. 8d), astrophyllite (Fig. 8e) and aegirine (Fig. 8f) were identified by laser Raman analysis...Mafic mineral (arfvedsonite, astrophyllite and aegirine) in melt inclusion form albite aplite. (g) Bastnaesite |  | | Journal (article/letter/editorial) | | alteration by K-, Fe- and Al-phyllosilicates, aegirine, hematite, fluorite and/or quartz, and that primary...(Salvi and Williams-Jones, 2006) and the nepheline–aegirine syenites at Thor Lake (Sheard et al., 2012), in...(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 |  | | 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...samples, arfvedsonite has been partially replaced by aegirine (Fig. 4d, e). The quartz is anhedral to subhedral...strongly altered with arfvedsonite being replaced by aegirine and/or hematite, and the zircon-silicates occurring |  | MacDonald, Ray, Bagiński, Bogusław, Kartashov, Pavel M., Zozulya, Dmitry, Dzierżanowski, Piotr (2015) Interaction Of Rare-Metal Minerals With Hydrothermal Fluids: Evidence From Quartz–Epidote Metasomatites Of The Haldzan Buragtag Massif, Mongolian Altai. The Canadian Mineralogist, 53 (6) 1015-1034 doi:10.3749/canmin.1400023 | Journal (article/letter/editorial) | | essentially a continuous sequence of events during a complex evolutionary history, a peralkaline granitic pegmatite...-carbonate assemblages and fergusonite-(Y) by complex hingganite–cerite–thorite assemblages. Late-stage...Williams-Jones 2006, Gysi & Williams-Jones 2013); Amis, Namibia (Schmitt et al. 2002), Tamazeght, Morocco (Salvi...some distance from the ore zones; they form a complex of ore-free metasomatites. This study is focused...electron microprobe at the Inter-Institute Analytical Complex at the Institute of Geochemistry, Mineralogy, and |  | | Journal (article/letter/editorial) | | rare metal potential of the peralkaline volcanic complex of the southern Peak Range, Central Queensland...rare metal potential of the peralkaline volcanic complex of the southern Peak Range, Central Queensland...rare metal potential of the peralkaline volcanic complex of the southern Peak Range, Central Queensland...rhyolite, arfvedsonite rhyolite and aegirine rhyolite. The aegirine rhyolite bodies represent the most...f Nb, Ta, and REE. Clarrys Dome, one of three aegirine rhyolite domes, features a late stage magmatic |  | | Journal (article/letter/editorial) | | indicating their immiscibility. Micrometer-sized aegirine crystals and primary hydrocarbon-bearing inclusions...during sodalite growth. Sodalite rims are devoid of aegirine or primary hydrocarbon inclusions and probably...Introduction The Mesoproterozoic Ilímaussaq igneous complex is one of ten alkaline intrusive bodies in the...(1912), numerous papers dealing with the Ilímaussaq complex have been published (e.g. Larsen and Sørensen,... petrology and geochemistry of the Ilímaussaq complex are relatively well known (e.g. Ferguson, 1964; |  | 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/$ |  | Kynicky, J., Chakhmouradian, A. R., Xu, C., Krmicek, L., Galiova, M. (2011) DISTRIBUTION AND EVOLUTION OF ZIRCONIUM MINERALIZATION IN PERALKALINE GRANITES AND ASSOCIATED PEGMATITES OF THE KHAN BOGD COMPLEX, SOUTHERN MONGOLIA. The Canadian Mineralogist, 49 (4) 947-965 doi:10.3749/canmin.49.4.947 | Journal (article/letter/editorial) | | GRANITES AND ASSOCIATED PEGMATITES OF THE KHAN BOGD COMPLEX, SOUTHERN MONGOLIA Jindrich KYNICKY§ Department...Republic Abstract The western part of the Khan Bogd complex, in the south Gobi desert, southern Mongolia, comprises...emplacement): microcline-phyric granite, peralkaline aegirine–arfvedsonite granite (main intrusive phase) and...aplite–pegmatite bodies are texturally and compositionally complex products of Zr enrichment during the differentiation...Bogd (or Khan Bogdo or Khan-Bogdinskii) igneous complex, in Mongolia, one of the largest known intrusions |  | | Journal (article/letter/editorial) | | pegmatite: a case study from the Ambohimirahavavy complex, Madagascar GUILLAUME ESTRADE *, STEFANO SALVI...pegmatitic granites from the Cenozoic Ambohimirahavavy complex, and assess the magmatic conditions required to...Introduction EUDIALYTE-group minerals (EGM) are complex Na-Ca-Zr-cyclosilicates with the general formula...1180/minmag.2017.081.053 are incorporated into complex Na-K-Ca-Zr-silicates, rich in volatiles (Cl, F...in the Ilímaussaq complex, the Norra Kärr complex in Sweden and the Kipawa complex in Canada; Goodenough |  | 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 |
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