 | | Journal (article/letter/editorial) | | Rare-Metal Mineralization in the Ambohimirahavavy Alkaline Complex, Madagascar Guillaume Estrade,1 Stefano...0E8 Abstract The Cenozoic Ambohimirahavavy alkaline complex in Madagascar consists of several syenitic...relative importance of these two processes. Skarns in alkaline system offer an important opportunity to evaluate...Sinclair, 1998). The Ambohimirahavavy alkaline complex, located in the northwest of Madagascar, has been the...Geologic Setting Regional geology The Ambohimirahavavy alkaline complex (24.2 ± 0.6 Ma; Estrade et al., 2014a) |  | Estrade, Guillaume, Marquis, Eva, Smith, Martin, Goodenough, Kathryn, Nason, Peter (2019) REE concentration processes in ion adsorption deposits: Evidence from the Ambohimirahavavy alkaline complex in Madagascar. Ore Geology Reviews, 112. 103027 doi:10.1016/j.oregeorev.2019.103027 | Journal (article/letter/editorial) | | deposits: evidence from the Ambohimirahavavy alkaline complex in Madagascar Guillaume Estrade, Eva Marquis...deposits: evidence from the Ambohimirahavavy alkaline complex in Madagascar, Ore Geology Reviews (2019)...deposits: evidence from the Ambohimirahavavy alkaline complex in Madagascar Authors Guillaume Estrade1*...present data from the Cenozoic Ambohimirahavavy alkaline complex in Madagascar, with the aim of further constraining...weathering profiles described here are developed on alkaline igneous rocks, including both SiO2-undersaturated |  | | 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...Ca-Na zirconosilicate in the agpaitic granite. Ambohimirahavavy EGM, as well as those from other peralkaline...of low Cl concentrations in these melts. At Ambohimirahavavy, contamination of the parental magma of the...Introduction EUDIALYTE-group minerals (EGM) are complex Na-Ca-Zr-cyclosilicates with the general formula |  | Estrade, Guillaume, BĂ©ziat, Didier, Salvi, Stefano, Tiepolo, Massimo, Paquette, Jean-Louis, Rakotovao, Soatsitohaina (2014) Unusual evolution of silica-under- and -oversaturated alkaline rocks in the Cenozoic Ambohimirahavavy Complex (Madagascar): Mineralogical and geochemical evidence. Lithos, 206. 361-383 doi:10.1016/j.lithos.2014.08.008 | Journal (article/letter/editorial) | | and -oversaturated alkaline rocks in the Cenozoic Ambohimirahavavy Complex (Madagascar): Mineralogical and...and -oversaturated alkaline rocks in the Cenozoic Ambohimirahavavy Complex (Madagascar): Mineralogical and...and -oversaturated alkaline rocks in the Cenozoic Ambohimirahavavy Complex (Madagascar): Mineralogical and...supĂ©rieure polytechnique de Madagascar, Ambatomaro Antsobolo Antananarivo Madagascar CE e PT Clermont-Ferrand...unknown Ambohimirahavavy ring complex in the Cenozoic alkaline province of northwestern Madagascar has recently |  | Ram, Rahul, Becker, Megan, Brugger, JoĂ«l, Etschmann, Barbara, Burcher-Jones, Cody, Howard, Daryl, Kooyman, Patricia J., Petersen, Jochen (2019) Characterisation of a rare earth element- and zirconium-bearing ion-adsorption clay deposit in Madagascar. Chemical Geology, 522. 93-107 doi:10.1016/j.chemgeo.2019.05.011 | Journal (article/letter/editorial) | | element (REE)-bearing ionadsorption clay deposit in Madagascar Rahul Ram, Megan Becker, JoĂ«l Brugger, Barbara...(REE)-bearing ion-adsorption clay deposit in Madagascar, Chemical Geology, https://doi.org/10.1016/j...(REE)-bearing ion-adsorption SC RI PT clay deposit in Madagascar Rahul Rama,b,c*, Megan Beckerb,d, JoĂ«l Bruggerc*...ABSTRACT: The Ambohimirahavavy igneous complex (Ampasibitika intrusion) in Madagascar hosts a world-class...selected samples from two regolith profiles at Ambohimirahavavy with a focus on REE geochemistry, mineralogy |  | Cucciniello, C., Tucker, R. D., Jourdan, F., Melluso, L., Morra, V. (2016) The age and petrogenesis of alkaline magmatism in the Ampasindava Peninsula and Nosy Be archipelago, northern Madagascar. Mineralogy and Petrology, 110 (2) 309-331 doi:10.1007/s00710-015-0387-1 | Journal (article/letter/editorial) | | petrogenesis of alkaline magmatism in the Ampasindava Peninsula and Nosy Be archipelago, northern Madagascar C. Cucciniello...Springer-Verlag Wien 2015 Abstract The Ampasindava alkaline province consists of a series of circular and...sedimentary rocks of the Antsiranana basin (NW Madagascar) and above the crystalline basement. The magmatism...New 40Ar/39Ar age determinations on feldspar separate of alkali granites and basaltic dykes yielded ages...ages of 18.01±0.36 Ma and 26±7 Ma, respectively. Alkali basalts and basanites, nepheline syenites and phonolites |  | Bernard, Cyrielle, Estrade, Guillaume, Salvi, Stefano, BĂ©ziat, 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) | | 1007/s00410-020-01723-y (2020) 175:81 ORIGINAL PAPER Alkali pyroxenes and amphiboles: a window on rare earth...evolution of alkaline silica-saturated systems using alkali pyroxene and amphiboles from six alkaline complexes...deposits can be primary (igneous, carbonatites and alkaline systems) or secondary (placers and ion-adsorption)...and Wall 2012; U. S. Geological Survey 2019). In alkaline igneous rocks, REE are hosted mainly in monazite-(Ce)...SĂžrensen 1987; Chakhmouradian and Wall 2012). Most alkaline igneous rocks are silica-undersaturated, with |  | Su, Hui-Min, Jiang, Shao-Yong, Zhu, Xin-You, Duan, Zhen-Peng, Huang, Xing-Kai, Zou, Tao (2021) Magmatic-hydrothermal processes and controls on rare-metal enrichment of the Baerzhe peralkaline granitic pluton, inner Mongolia, northeastern China. Ore Geology Reviews, 131. 103984pp. doi:10.1016/j.oregeorev.2021.103984 | Journal (article/letter/editorial) | | Replacements of arfvedsonite by aegirine and alkaline feldspar by albite occurred in the moderately-mineralized...show moderate SiO2 (63.20â68.00 wt%), high total alkali (Na2O + K2O = 9.94â10.23 wt%), and variable and...wt%), high total FeO (1.04â5.44 wt%) and total alkali (Na2O + K2O = 8.72â9.85 wt%) concentrations with...variable SiO2 (72.10â79.50 wt%) and lower total alkali (K2O + Na2O = 4.40â8.70 wt%) contents. All these...fluid inclusion studies, geochronology of the alkaline granite, as well as comparison between mineralized |  | | Journal (article/letter/editorial) | | associated with typical hydrothermal minerals (alkali-feldspars, quartz, fluorite, epidote-group minerals...Neoproterozoic (ca. 580 Ma, [25,31]) occurrence of the alkaline petrographic association of âA-typeâ granites...leucocratic, SiO2 -oversaturated alkali-feldspar syenites and alkali-feldspar quartz syenites, with subordinate...subordinate peralkaline alkali-feldspar granites. The granites occur as minor bodies in the central areas...leucocratic and composed of mesoperthitic alkali-feldspar, quartz and some interstitial sodic-calcic |  | Morgenstern, Regine, Turnbull, Rose E., Ashwell, Paul A., Horton, Travis W., Oze, Christopher (2019) Petrological and geochemical characteristics of REE mineralization in the A-type French Creek Granite, New Zealand. Mineralium Deposita, 54 (7) 935-958 doi:10.1007/s00126-018-0854-9 | Journal (article/letter/editorial) | | Abstract The French Creek Granite, New Zealand, is an alkaline intrusion with enrichment in rare earth elements...peraluminous biotite alkali feldspar granite to syenogranite, with subordinate quartz-alkali feldspar (QAF) syenite...important insight into the complex processes responsible for REE enrichment in alkaline igneous systems. Keywords...and a complex combination of processes. The primary economic sources of REE worldwide are alkaline igneous...deposits. Unraveling the complex processes by which REE enrichment occurs within alkaline igneous complexes |  | van de Ven, Mathijs A. J., Borst, Anouk M., Davies, Gareth R., Hunt, Emma J., Finch, Adrian A. (2019) Hydrothermal Alteration of Eudialyte-Hosted Critical Metal Deposits: Fluid Source and Implications for Deposit Grade. Minerals, 9 (7) 422 doi:10.3390/min9070422 | Journal (article/letter/editorial) | | eudialyte in nepheline syenite from the IlĂmaussaq Complex, Greenland, one of the worldâs largest known eudialyte-hosted...partial replacement of primary magmatic eudialyte by complex pseudomorph assemblages of secondary Zr-, Nb-,...Kringlerne deposit in the Mesoproterozoic IlĂmaussaq complex, South Greenland, presents a major repository of...halogen-rich melts and is identified by the presence of complex NaâCaâHFSE silicates such as eudialyte- and rinkite-group...lato, the primary ore mineral at Kringlerne, is an alkali-zirconosilicate with the simplified chemical formula |  | | Journal (article/letter/editorial) | | transsolvus granite, all of which contain perthitic alkali feldspar as the earliest major mineral; the transsolvus...Nb concentrations show the opposite trend. Alkali feldspar compositions mirror the trend shown by the...the silicate melt and the crystallization of alkali feldspar and HFSE-rich phases (zircon, monazite-(Ce)...monazite-(Ce), pyrochlore group). An alkali feldspar-rich crystal-mush containing LREE-ïŹuoride melt droplets was...hypersolvus granite. Massive fractionation of alkali feldspar led to a sharp increase in ÆH2O and Fâ activity |  | Sjöqvist, Axel S.L., Cornell, David H., Andersen, Tom, Christensson, Ulf I., Berg, Johan T. (2017) Magmatic age of rare-earth element and zirconium mineralisation at the Norra KĂ€rr alkaline complex, southern Sweden, determined by UâPb and LuâHf isotope analyses of metasomatic zircon and eudialyte. Lithos, 294. 73-86 doi:10.1016/j.lithos.2017.09.023 | Journal (article/letter/editorial) | | zirconium mineralisation at the Norra KĂ€rr alkaline complex, southern Sweden, determined by UâPb and LuâHf...zirconium mineralisation at the Norra KĂ€rr alkaline complex, southern Sweden, determined by UâPb and LuâHf...zirconium mineralisation at the Norra KĂ€rr alkaline complex, southern Sweden, determined by UâPb and LuâHf...se Abstract CE The agpaitic Norra KĂ€rr alkaline complex in southern Sweden is rich in heavy rare-earth...Zr complexes caused fenitisation (syn-magmatic alkali metasomatism) of the granitic wall rocks, which |  | | Journal (article/letter/editorial) | | of peralkaline granite dykes of the Straumsvola complex, western Dronning Maud Land, Antarctica Chris Harris1...and granite dykes formed by partial melting of alkali-metasomatised gneiss that surrounds the nepheline...be said to be agpaitic; such rocks contain rare alkali silicate minerals are much rarer than miaskitic...element modelling, some authors have concluded that alkaline granites in general are the products of prolonged...that propose that alkaline granites are the result of assimilation of crust by alkali basalt magma that |  | Borst, A. M., Friis, H., Andersen, T., Nielsen, T. F. D., Waight, T. E., Smit, M. A. (2016) Zirconosilicates in the kakortokites of the IlĂmaussaq complex, South Greenland: Implications for fluid evolution and high-field-strength and rare-earth element mineralization in agpaitic systems. Mineralogical Magazine, 80 (1) 5-30 doi:10.1180/minmag.2016.080.046 | Journal (article/letter/editorial) | | Zirconosilicates in the kakortokites of the IlĂmaussaq complex, South Greenland: Implications for fluid evolution...nepheline syenites (kakortokites) of the IlĂmaussaq complex, South Greenland, host voluminous accumulations...accumulations of eudialyte-group minerals (EGM). These complex Na-Ca-zirconosilicates contain economically attractive...BASED on studies of the peralkaline IlĂmaussaq complex, South Greenland, Ussing (1912) introduced the...additionally characterized by the presence of complex Na-Zr-Ti silicates, such as eudialyte-group minerals |  | | Journal (issue) | | with giant fluid inclusion âą Grandidierite from Madagascar âą Mexican demantoid from new deposits âą New natural-color...green chalcedony âą Rubies from new deposit in Madagascar âą Plastic imitation of golden coral âą Conference...from a new deposit in Zahamena National Park, Madagascar. There are also reports from the 2015 Geological...color-change behavior of pyrope-spessartine garnets from Madagascar (Krzemnicki et al., 2001; Schmetzer et al., 2009)...of two transmission windows (figure 14) and the complex relationship between them. It is difficult to predict |  | Fitros, Michalis, Tombros, Stylianos F., Kokkalas, Sotirios, Kilias, Stephanos P., Perraki, Maria, Skliros, Vasilios, Simos, Xenofon C., Papaspyropoulos, Konstantinos, Avgouropoulos, George, Williams-Jones, Anthony E., Zhai, Degao, Hatzipanagiotou, Konstantin (2020) REE-enriched skarns in collisional settings: The example of Xanthi's Fe-skarn, Rhodope Metallogenetic Massif, Northern Greece. Lithos, 370. 105638pp. doi:10.1016/j.lithos.2020.105638 | Journal (article/letter/editorial) | | typically linked to carbonatites and ultra-alkaline to alkaline and peralkaline intrusives at re intraplate...Pre-proof 2.2. Xanthiâs intrusives The Xanthi plutonic complex comprises a laccolith which intruded both the NSZ...Magnetite-Hematite buffer (MH) () boundary. A complex network of zoned pegmatite, rare lamprophyre, aplogranite...intergrown with, or replaced by, alkali feldspars and garnet (Fig. 2e). The alkali feldspars are more frequent...of the ferromagnesian minerals and plagioclase, alkali feldspars, Fe-Ti oxides, apatite, zircon and Th-bearing |  | Luo, Xianping, Zhang, Yongbing, Zhou, Hepeng, He, Kunzhong, Luo, Caigui, Liu, Zishuai, Tang, Xuekun (2022) Review on the Development and Utilization of Ionic Rare Earth Ore. Minerals, 12 (5) 554 doi:10.3390/min12050554 | Journal (article/letter/editorial) | | the acidity of mineralization in combination with alkali metals and differences in calcium-controlled ore...Thailand, Laos, the Philippines, the United States, Madagascar, and other countries or regions. Among them,... the proven rare earth oxide reserves in Madagascar are 39,092 t, with an average content of 975 Ă 10â6...granodiorite-biotite granite Mamasa and palu granite Madagascar Antsirabe Tropic 1200 Tonalite REE (Ă10â6 ) Thickness...rare earth [12â14]. After long-term weathering, feldspar, mica, and other minerals in the rock are gradually |  | | Book (chapter) | | (Umwandlung mit Austausch von Stoffen); e.g., feldspar altered to cassiterite. In 1855, Gustav Georg...categories have been arranged from simple to more complex. 1. Paramorphs. Paramorphs are the result of polymorphism...mineralogy has been carefully studied and found to be a complex mixture of mostly rare secondary copper minerals...been erroneously described as pseudomorphs after feldspar or calcite. Polyhedroid is the preferred term...b. Molds (of animals or plants). c. Casts. 8. Complex combinations of the above. There is very little |  | | Book | | (Umwandlung mit Austausch von Stoffen); e.g., feldspar altered to cassiterite. In 1855, Gustav Georg...categories have been arranged from simple to more complex. 1. Paramorphs. Paramorphs are the result of polymorphism...mineralogy has been carefully studied and found to be a complex mixture of mostly rare secondary copper minerals...been erroneously described as pseudomorphs after feldspar or calcite. Polyhedroid is the preferred term...b. Molds (of animals or plants). c. Casts. 8. Complex combinations of the above. There is very little |  | | Book | | geology The Saint-Andre carbonatite complex The Oka carbonatite complex Mont Royal Mont Saint-Bruno (Montarville)...fully understand the petrogenesis of the igneous complex. In nepheline syenite and sodalite syenite pegmatites...concerning the origin of the Monteregian Hills alkaline province, and a brief description of each member...used interchangeably for the mountain, the alkaline complex, and the eponymous town situated at the foot...briefly mentioned the presence in the rock of feldspar, black hornblende, a copper-colored mica, and |
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