 | 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) | | 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) |  | | Journal (article/letter/editorial) | | peralkaline granite and pegmatite: a case study from the Ambohimirahavavy complex, Madagascar GUILLAUME ESTRADE...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 |  | Goodenough, Kathryn M., Shaw, Richard A., Smith, Martin, Estrade, Guillaume, Marqu, Eva, Bernard, Cyrielle, Nex, Paul (2019) Economic mineralization in pegmatites: comparing and contrasting NYF and LCT examples. The Canadian Mineralogist, 57 (5) 753-755 doi:10.3749/canmin.ab00013 | Journal (article/letter/editorial) | | of the Witwatersrand, South Africa Keywords: pegmatite, resources, critical metals. INTRODUCTION Granitic...compare recent work from examples § of the two pegmatite families and summarize how magmatic and hydrothermal...to be typically associated with metaluminous to alkaline (locally peralkaline) granitic bodies (CÌernyÌ...(Vasyukova & Williams-Jones 2014); and the Amis Complex in Namibia (Schmitt et al. 2002). In Corresponding...focus on the Cenozoic alkaline province of the Ampasindava Peninsula in Madagascar, particularly the Ambohimirahavavy |  | | Journal (article/letter/editorial) | | adsorption-type REE deposit associated with the Ambohimirahavavy alkaline complex: potential controls on mineralisation...challenging (Mariano & Mariano 2012). At Ambohimirahavavy, Madagascar, peralkaline igneous rocks have been...which is thus relatively easy to process. The Ambohimirahavavy prospect is currently unique in hosting a...recognised ion adsorption-type deposit developed above alkaline to peralkaline igneous and volcanic rocks, some...composition (e.g. Profile TAND044: weathered pegmatite 738 ppm REE; weathered mudstone 378 ppm REE). |  | 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 |  | Wu, Bin, Wang, Ru-Cheng, Yang, Jin-Hui, Wu, Fu-Yuan, Zhang, Wen-Lan, Gu, Xiang-Ping, Zhang, Ai-Cheng (2015) Wadeite (K 2 ZrSi 3 O 9 ), an alkali-zirconosilicate from the Saima agpaitic rocks in northeastern China: Its origin and response to multi-stage activities of alkaline fluids. Lithos, 224. 126-142 doi:10.1016/j.lithos.2015.02.008 | Journal (article/letter/editorial) | | origin and response to multi-stage activities of alkaline fluids Bin Wu, Ru-Cheng Wang, Jin-Hui Yang, Fu-Yuan...origin and response to multi-stage activities of alkaline ïŹuids, LITHOS (2015), doi: 10.1016/j.lithos.2015...response to SC R IP T multi-stage activities of alkaline fluids Bin Wu1, Ru-Cheng Wang1,*, Jin-Hui Yang2... ACCEPTED MANUSCRIPT Abstract The Triassic Saima alkaline complex in the Liaodong Peninsula of northeastern...eudialyte-bearing nepheline syenite in the northwest of the complex. The phonolite has similar features to miaskite |  | 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 |  | 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) | | evolution of alkaline silica-saturated systems using alkali pyroxene and amphiboles from six alkaline complexes...processes globally. Keywords Peralkaline granite · Pegmatite · Pyroxene · Amphibole · Rare earth elements ·...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) | | fine-grained granite, as well as transsolvus pegmatite and aplite; the moderately-mineralized granite... Replacements of arfvedsonite by aegirine and alkaline feldspar by albite occurred in the moderately-mineralized...fluid inclusion studies, geochronology of the alkaline granite, as well as comparison between mineralized...%) Hypersolvus granite Fine-grained granite Pegmatite(aplite) REE, Zr, Nb and Be from North China Craton...is finegrained and usually contains pegmatite pockets. Pegmatite-(aplite) dykes, ranging from 6 to 10 |  | Wu, Ming-qian, Tian, Bao-feng, Zhang, De-hui, Xu, Guo-zhan, Xu, Wen-xi, Qiu, Kun-feng (2018) Zircon of the No. 782 deposit from the Great Xingâan Range in NE China: Implications for Nb-REE-Zr mineralization during magmatic-hydrothermal evolution. Ore Geology Reviews, 102. 284-299 doi:10.1016/j.oregeorev.2018.09.006 | Journal (article/letter/editorial) | | especially Nb deposits are carbonatites, followed by alkaline/peralkaline igneous rocks, including silica-saturated...silica-saturated granites (Linnen et al., 2014). As alkaline/peralkaline parental magmas mainly derived from...with carbonatites, rare-metal deposits related to alkaline/peralkaline igneous rocks contain more resources...reliable indicator of magmatic evolution during complex geological processes (e.g., Pearce and Cann, 1973;...(Yang et al., 2014), and in the Ambohimirahavavy alkaline complex, Madagascar (Estrade et al., 2015a). All |  | 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...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...as a source of REE. This study focuses on the alkaline French Creek Granite in Westland, New Zealand |  | Borst, Anouk M., Finch, Adrian A., Friis, Henrik, Horsburgh, Nicola J., Gamaletsos, Platon N., Goettlicher, Joerg, Steininger, Ralph, Geraki, Kalotina (2020) Structural state of rare earth elements in eudialyte-group minerals. Mineralogical Magazine, 84 (1) 19-34 doi:10.1180/mgm.2019.50 | Journal (article/letter/editorial) | | Na-Ca-Zr-cyclosilicates that accommodate many elements in their complex trigonal crystal structure. In addition to the...framework are filled with polyhedra of alkali, alkaline-earth and transitional-metal cations (valences...five localities; IlĂmaussaq, the Narsaarsuk1 pegmatite (Greenland); Norra KĂ€rr (Sweden); Kipawa (Canada);...consistent with published EGM compositions from that complex (Johnsen and Grice, 1999). For simplicity we refer...for eudialyte from the IlĂmaussaq complex and the Narsaarsuk pegmatite from Johnsen and Grice (1999). Crystallographic |  | 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...pseudomorphic replacement. The alteration product is a complex intergrowth of microcrystalline zirconosilicates |  | | Journal (article/letter/editorial) | | Platreef in the northern limb of the Bushveld Complex, South Africaâ Tshipeng Mwenze, Charles Okujeni...pegmatites: A case study from the spodumene-rich Moblan pegmatite, Quebec, CanadaâVictoria Maneta and Don R. Baker...103005 Hydrothermal processes in the Fen alkaline-carbonatite complex, southern NorwayâChristian A.F. Dietzel...deposits: Evidence from the Ambohimirahavavy alkaline complex in MadagascarâGuillaume Estrade, Eva Marquis |  | | Journal (article/letter/editorial) | | Neoproterozoic (ca. 580 Ma, [25,31]) occurrence of the alkaline petrographic association of âA-typeâ granites...Corporation, Acton, MA, USA) operating with a 15 kV alkaline, with a peralkaline or agpaitic index ((Na2O +...related pegmatites, such as the Ambohimirahavavy bohimirahavavy (Madagascar), Strange Lake (Canada), and...and Khan Bogd (Mongolia) (Madagascar), Strange Lake (Canada), and Khan Bogd (Mongolia) complexes [22,44...phases were described in granites from the Ambohimirahavavy complex [22]. In the studied case, there was no |  | | Journal (article/letter/editorial) | | post-magmatic products of the Keivy alkali granite complex, NW Russia Dmitry Zozulya, Ray Macdonald, BogusĆaw...post-magmatic products of the Keivy alkali granite complex, NW Russia, Ore Geology Reviews (2020), doi: https://doi...post-magmatic products of the Keivy alkali granite complex, NW Russia Dmitry Zozulya a,*, Ray Macdonald b... Zozulya). Abstract The Keivy alkali granite complex, Kola Peninsula, NW Russia, contains numerous Zr-REE-YNb...Zr-REE-YNb occurrences and deposits, formed by a complex sequence of pegmatitic, hydrothermal and metasomatic |  | | Journal (article/letter/editorial) | | granitoid rocks. Carbonatites occur as part of alkaline silicate-carbonatite complexes, which are composed...apatite-magnetite (mostly altered to hematite) bodies. Alkaline silicate rocks and carbonatites show common geochemical...four geological environments [4,5]: carbonatites, alkaline felsic igneous systems and two secondary deposit...environments (i.e., primary deposits)âcarbonatites and alkaline felsic igneous rocks (Figure 1). REE occur together...genetic connection with carbonatites and related alkaline silicate rocks [9]. Carbonatites mainly form various |  | Salvi, Stefano, Giuliani, Gaston, ANDRIANJAKAVAH, Prosper Rakatovao, Moine, Bernard, Beziat, Didier, Fallick, Anthony (2017) Fluid Inclusion and Stable Isotope Constraints On the Formation of the Ianapera Emerald Deposit, Southern Madagascar. The Canadian Mineralogist, 55 (4) 619-650 doi:10.3749/canmin.1700017 | Journal (article/letter/editorial) | | FORMATION OF THE IANAPERA EMERALD DEPOSIT, SOUTHERN MADAGASCAR STEFANO SALVI§ UniversiteÌ Paul Sabatier, GET...the Neoproterozoic Vohibory domain of southern Madagascar, within a tightly folded metamorphic sequence...THE CANADIAN MINERALOGIST Keywords: southern Madagascar, Ianapera, emerald, distal and proximal deposits...case for most emerald mines in Zambia, Russia, Madagascar, and Brazil (Groat et al. 2014). The most common...Quartz is dissolved and the pegmatite is called a desilicated pegmatite (Barton & Young 2002). The metasomatic |  | Harlaux, Matthieu, Marignac, Christian, Cuney, Michel, Mercadier, Julien, Magott, RĂ©mi, Mouthier, Bernard (2015) Nb-Ti-Y-HREE-W-U Oxide Minerals With Uncommon Compositions Associated With the Tungsten Mineralization In the Puy-Les-Vignes Deposit (Massif Central, France): Evidence For Rare-Metal Mobilization By Late Hydrothermal Fluids With A Peralkaline Signature. The Canadian Mineralogist, 53 (4) 653-672 doi:10.3749/canmin.1400096 | Journal (article/letter/editorial) | | focused on these rare-metal oxides, which display complex internal textures and uncommon chemical compositions...crystallochemical study shows that these crystals appear as a complex multi-polar solid solution, involving chemical...Ercit 2005). They are generally characterized by complex crystal chemistry and often display metamictization...et al. 2012, Chakhmouradian et al. 2015), or in alkaline to peralkaline granites and syenites (e.g., Salvi...20 km south of the St. Sylvestre leucogranitic complex (324 ± 4 Ma, Holliger et al. 1986) and 15 km west |  | | 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 |  | 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 (article/letter/editorial) | | 0.5 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...1353â1290 Ma Nain complex and ïŹnally by silica under- and over-saturated alkaline intrusive and volcanic...34â52 6244000 36 Strange Lake pluton 6242000 Pegmatite Fluorite Breccia Hypersolvus granite Dark porphyritic...zircon- and ilmenite-bearing alkaline rocks to rocks containing complex alkali-zircono- and sodium titano-silicates |  | Xiang, Lu, Wang, Rucheng, Romer, Rolf L., Che, Xudong, Hu, Huan, Xie, Lei, Tian, Ennong (2020) Neoproterozoic Nb-Ta-W-Sn bearing tourmaline leucogranite in the western part of Jiangnan Orogen: Implications for episodic mineralization in South China. Lithos, 360. 105450 doi:10.1016/j.lithos.2020.105450 | Journal (article/letter/editorial) | | type of mineralization (e.g., NYF- vs. LCT-type pegmatite; ÄernĂœ, 1991; Jo u Sn- vs. W- bearing granites...fine-grained tourmaline leucogranite with minor pegmatite. The undeformed tourmaline leucogranite shows...leucogranite as at Lanchaping (Fig. 2B). The pegmatite has phenocrysts of albite (~2 cm long), quartz...analytical methods About fifty granite and three pegmatite samples were collected in the Journal Pre-proof...tourmaline K-feldspar in tourmaline leucogranite and pegmatite of the Fanjingshan intrusion has nearly end- member |  | | Journal (article/letter/editorial) | | of peralkaline granite dykes of the Straumsvola complex, western Dronning Maud Land, Antarctica Chris Harris1...element modelling, some authors have concluded that alkaline granites in general are the products of prolonged...between these two models are those that propose that alkaline granites are the result of assimilation of crust...melting of felsic crust. Examples include the Puklen Complex of the Gardar Province, South Greenland; the Marangudzi...Mt. Brome in Canada, the Ambohimirahavy Complex, Madagascar, and Messum in Namibia (Marks et al. 2003; |
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