 | | 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) |  | Ram, Rahul, Becker, Megan, Brugger, Joël, 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, Joël 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, Joël 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 |  | 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 |  | Estrade, Guillaume, Béziat, 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...supérieure 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 |  | | 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 |  | 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) | | 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)...Sørensen 1987; Chakhmouradian and Wall 2012). Most alkaline igneous rocks are silica-undersaturated, with...processes play a role for a pre-enrichment of alkaline rocks in REE and other HFSE (Marks and Markl 2017) |  | | Journal (article/letter/editorial) | | Neoproterozoic (ca. 580 Ma, [25,31]) occurrence of the alkaline petrographic association of “A-type” granites...and ferriepidote), zircon, and minute magnetite, hematite, and galena are the main hydrothermal minerals...and ferriepidote), zircon, and minute magnetite, hematite, and galena are the main hydroand multi-channel...Corporation, Acton, MA, USA) operating with a 15 kV alkaline, with a peralkaline or agpaitic index ((Na2O +...*), Er (Lα, ErPO4 *), Yb (Lα, YbPO4 *), Fe (Kα, hematite), Mn (Kα, Mn-olivine), Mg (Kα, diopside), Ca (Kα |  | 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 Xing’an 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;...zircon (Si, Zr), apatite (Ca), rhodonite (Mn), hematite (Fe), YAl garnet (Y), and galena (Pb). Peak counting |  | | Journal (article/letter/editorial) | | Article Recovery of Rare Earth Elements Minerals in Complex Low-Grade Saprolite Ore by Froth Flotation George...W. Recovery of Rare Earth Elements Minerals in Complex Low-Grade Saprolite Ore by Froth Flotation. Minerals...elements (REE)– rich concentrate from an Australian complex low–grade saprolite ore [1.14% total rare earth...association with different gangue minerals including hematite (Fe2 O3 ), quartz (SiO2 ), muscovite [(KF)2 (Al2...the fact that most gangue minerals tend to form complex composite particles with REE minerals even at such |  | | Journal (article/letter/editorial) | | Platreef in the northern limb of the Bushveld Complex, South Africa— Tshipeng Mwenze, Charles Okujeni...102849 Supergene modification of magnetite and hematite shear zones in banded iron-formation at Mt Richardson...103005 Hydrothermal processes in the Fen alkaline-carbonatite complex, southern Norway—Christian A.F. Dietzel...deposits: Evidence from the Ambohimirahavavy alkaline complex in Madagascar—Guillaume Estrade, Eva Marquis |  | 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 Kärr alkaline complex, southern Sweden, determined by U–Pb and Lu–Hf 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 Kärr alkaline complex, southern Sweden, determined by U–Pb and Lu–Hf...zirconium mineralisation at the Norra Kärr alkaline complex, southern Sweden, determined by U–Pb and Lu–Hf...zirconium mineralisation at the Norra Kärr alkaline complex, southern Sweden, determined by U–Pb and Lu–Hf...se Abstract CE The agpaitic Norra Kärr alkaline complex in southern Sweden is rich in heavy rare-earth...agpaitic rocks, rare-earth elements, Norra Kärr alkaline complex, zircon, ED M eudialyte, fenitization |  | | 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...1353–1290 Ma Nain complex and finally by silica under- and over-saturated alkaline intrusive and volcanic...aegirine and/or hematite, and the zircon-silicates occurring as pseudomorphs of quartz, hematite and zircon...et al., 2016). 4.1.5. Fluorite-hematite breccia A barren fluorite-hematite breccia is exposed at the northwestern |  | Huang, Jian, Tan, Wei, Liang, Xiaoliang, He, Hongping, Ma, Lingya, Bao, Zhiwei, Zhu, Jianxi (2021) REE fractionation controlled by REE speciation during formation of the Renju regolith-hosted REE deposits in Guangdong Province, South China. Ore Geology Reviews, 134. 104172pp. doi:10.1016/j.oregeorev.2021.104172 | Journal (article/letter/editorial) | | microscopy, usually occur in the form of goethite and hematite in the lower and upper parts of regoliths, respectively..., 2017). The most widespread Fe (hydr)oxides, hematite and goethite, have a strong chemical affinity...mineral (quartz, plagioclase, K-feldspar, amphibole, hematite, biotite, chlorite, gibbsite, illite, smectite...smectite, kaolinite, halloysite, gibbsite, and hematite (Fig. 3). Illite and smectite appear in the upper...10% in the B2 and A horizons (at depths <25 m). Hematite occurs mainly in the B1 and A horizons (at depths |  | | Journal (issue) | | with giant fluid inclusion • Grandidierite from Madagascar • Mexican demantoid from new deposits • New natural-color...green chalcedony • Rubies from new deposit in Madagascar • Plastic imitation of golden coral • 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)...limonitic mineral) and a tiny black prism (possibly hematite, ilmenite, or senaite) were captured by a transparent |  | Borst, A. M., Friis, H., Andersen, T., Nielsen, T. F. D., Waight, T. E., Smit, M. A. (2016) Zirconosilicates in the kakortokites of the Ilímaussaq 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 Ilímaussaq complex, South Greenland: Implications for fluid evolution...nepheline syenites (kakortokites) of the Ilímaussaq 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 Ilímaussaq 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) | | 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...four geological environments [4,5]: carbonatites, alkaline felsic igneous systems and two secondary deposit...environments (i.e., primary deposits)—carbonatites and alkaline felsic igneous rocks (Figure 1). REE occur together...genetic connection with carbonatites and related alkaline silicate rocks [9]. Carbonatites mainly form various |  | 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. Xanthi’s intrusives The Xanthi plutonic complex comprises a laccolith which intruded both the NSZ...straggling the NNO and Magnetite-Hematite buffer (MH) () boundary. A complex network of zoned pegmatite, rare... syenite, tonalite, granodiorite, granite and alkaline granite aligned on the subalkaline-midalkaline...inclusions, based on their optical properties contain hematite, Fe-chlorides, antarcticite and calcite, in addition |  | Broom-Fendley, Sam, Brady, Aoife E., Wall, Frances, Gunn, Gus, Dawes, William (2017) REE minerals at the Songwe Hill carbonatite, Malawi: HREE-enrichment in late-stage apatite. Ore Geology Reviews, 81. 23-41 doi:10.1016/j.oregeorev.2016.10.019 | Journal (article/letter/editorial) | | Heavy rare earth elements Synchysite-(Ce) Chilwa Alkaline Province Critical metals Songwe Hill a b s t...track the magmatic and hydrothermal evolution of alkaline rocks (Zirner et al., 2015; Ladenburger et al...relationship between carbonatites and associated alkaline rocks (Le Bas and Handley, 1979; Stoppa and Liu...the Mozambique border, and is part of the Chilwa Alkaline Province (Fig. 1). This province is an essentially...essentially intrusive suite of Early Cretaceous alkaline rocks intruded into Precambrian basement (Garson, |  | | Journal (article/letter/editorial) | | Territories early studies of the Sue-Dianne magnetite-hematite IOCG deposit and iron oxide-rich mineralization...alkali alteration systems encompass magnetite-to-hematite IOCG showings and prospects, and iron oxide-rich...deposition and intrusion of shoshonitic to high K, calc-alkaline magmas across the 1886 ± 8 Ma sedimentary basin...Bear magmatic zone, shoshonitic to high K calc-alkaline andesitic to rhyolitic volcanic and volcaniclastic...Ta-U-Nb-Fe-Ti-rich mineral formed during superimposition of hematite-bearing potassic-iron alteration (09CQA-1059) |  | | Book | | 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...b. Molds (of animals or plants). c. Casts. 8. Complex combinations of the above. There is very little...deposits, the sequence of events can be quite complex, but unraveling that sequence can be quite valuable...fluid. The pentlandite to violarite reaction is complex, contingent upon a great number of solution parameters |  | | Book (chapter) | | 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...b. Molds (of animals or plants). c. Casts. 8. Complex combinations of the above. There is very little...deposits, the sequence of events can be quite complex, but unraveling that sequence can be quite valuable...fluid. The pentlandite to violarite reaction is complex, contingent upon a great number of solution parameters |  | | 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...From the syenites, he identified such signature alkaline minerals as eudialyte, a lavenite-like mineral |
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