 | | 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...strength element (HFSE)-rich phases consist mainly of zircon, bastnĂ€site-(Ce), and Ca-REE-, and Ca-HFSE-rich...the main HFSE-rich phases are bastnĂ€site-(Ce), zircon, pyrochlore, Nb-rich titanite, and an unidentified...quartz, fluorite, and fluorapatite. The secondary zircon is characterized by a low Zr content and by the |  | 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...replaced by secondary assemblages consisting of zircon and quartz in the transitional granite and an unidentified...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 |  | 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 |  | 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 |  | | 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...include late magmatic REE-bearing phases (eudialyte, zircon, pyrochlore) and hydrothermal phases (allanite |  | 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 |  | 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...patterns of the mafic lavas match those of Na-alkaline lavas in within-plate rift settings. The patterns... F-disilicates). Introduction The island of Madagascar records two magmatic episodes during Cretaceous |  | 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...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...processes play a role for a pre-enrichment of alkaline rocks in REE and other HFSE (Marks and Markl 2017) |  | | Journal (article/letter/editorial) | | bacteria on the stability of gold (I) thiosulphate complexâJeremiah Shuster, Trudy Bolin, Lachlan C.W. MacLean...compositions, age and origin of gem corundums in Madagascar alkali basaltsâSaholy Rakotosamizanany, Gaston...and metallogeny of the Precambrian basement of MadagascarâBernard Moine, Anne NĂ©dĂ©lec, and Enrique Ortega...Ampandrandava and similar phlogopite deposits in southern Madagascar: Derivation from a silicocarbonatitic melt of...constraints on the Dabolava mesothermal gold occurence, Madagascar: Implications for the Ikalamavony sub-domain |  | 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) | | Accepted Manuscript Zircon of the No. 782 deposit from the Great Xingâan Range in NE China: Implications... Tian, D-h. Zhang, G-z. Xu, W-x. Xu, K-f. Qiu, Zircon of the No. 782 deposit from the Great Xingâan Range...disclaimers that apply to the journal pertain. 1 Zircon of the No. 782 deposit from the Great Xingâan Range...granite (granite) that dominates the study area. Zircon is the only Zr-bearing mineral in both the porphyry...hosts only magmatic zircon, both magmatic (type I) and metasomatic (type II) zircon crystals or aggregates |  | Wu, Bin, Wang, Ru-Cheng, Yang, Jin-Hui, Wu, Fu-Yuan, Zhang, Wen-Lan, Gu, Xiang-Ping, Zhang, Ai-Cheng (2016) Zr and REE mineralization in sodic lujavrite from the Saima alkaline complex, northeastern China: A mineralogical study and comparison with potassic rocks. Lithos, 262. 232-246 doi:10.1016/j.lithos.2016.07.013 | Journal (article/letter/editorial) | | mineralization in sodic lujavrite from the Saima alkaline complex, northeastern China: A mineralogical study...mineralization in sodic lujavrite from the Saima alkaline complex, northeastern China: A mineralogical study...mineralization in sodic lujavrite from the Saima alkaline complex, northeastern China: a mineralogical study...MANUSCRIPT Abstract T The Triassic Saima alkaline complex on the Liaodong Peninsula, northeastern IP...catapleiite. Ultimately, the fractionation of the alkaline MA magma leads to the crystallization of mosandrite |  | 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...fluid inclusion studies, geochronology of the alkaline granite, as well as comparison between mineralized...Loparite Monzonite Pyrochlore Synchysite-(Ce) Thorite Zircon Bast-(Ce) Cst Col-(Fe) Flc Gad-(Ce) Gad-(Y) Gth...in laparite, columbite(Fe), and pyrochlore, and zircon is the only ore mineral for Zr. Table 1 lists the...feldspar; Arf, arfvedsonite; Qtz, quartz; Zrn, zircon. whereas banded structure is present at the margin |  | | Journal (article/letter/editorial) | | Geochemistry of Hydrothermal Cryptoand Microcrystalline Zircon Aggregates in a Peralkaline Granite Silvio R. F...Singular crypto- and microcrystalline hydrothermal zircon aggregates occur in peralkaline granites from the...a hydrothermal fluid and, compared to magmatic zircon crystals from the host, were found to contain relatively...Elements), features most typical of hydrothermal zircon, as well as high Th/U ratios, whereas the Lu-Hf...were found to be similar. The formation of the zircon aggregates and the associated epidote-groups minerals |  | 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...enrichment is defined by the occurrence of allanite, zircon, apatite, fergusonite, monazite, perrierite, and...bastnĂ€site group minerals, monazite, xenotime, and zircon. Quartz protuberances, dilatational microfractures...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 |  | 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...consistent with published EGM compositions from that complex (Johnsen and Grice, 1999). For simplicity we refer...ORNL (Boatner, 2002). Excluding the gem-quality zircon and a diamond blank, samples and standards were...structural models for eudialyte from the IlĂmaussaq complex and the Narsaarsuk pegmatite from Johnsen and Grice |  | | Journal (article/letter/editorial) | | Platreef in the northern limb of the Bushveld Complex, South Africaâ Tshipeng Mwenze, Charles Okujeni...Zhao, Jianghong Deng, and Jianshe Li article 475 Zircon U-Pb, molybdenite Re-Os and quartz vein Rb-Sr geochronology...metallogenetic processes: A comparative study of zircon and apatite from Wushan Cu- and Zhuxiling W(Mo...103005 Hydrothermal processes in the Fen alkaline-carbonatite complex, southern NorwayâChristian A.F. Dietzel...polymetallic deposit, south China: Constraints from zircon geochronology and geochemistry in skarnsâWei-Cheng |  | 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-,...the zirconosilicates catapleiite, gittinsite and zircon, respectively, of which the catapleiite type is...catapleiite-type, one gittinsite-type, and one zircon-type assemblage). Trace element budgets for the...fresh eudialyte. Moreover, the gittinsite- and zircon-type assemblages record preferential heavy REE |  | 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...LuâHf isotope analyses of metasomatic zircon and eudialyte Axel S.L. Sjöqvist, David H. Cornell, Tom...zirconium mineralisation at the Norra KĂ€rr alkaline complex, southern Sweden, determined by UâPb and LuâHf...LuâHf isotope analyses of metasomatic zircon and eudialyte. The address for the corresponding author...zirconium mineralisation at the Norra KĂ€rr alkaline complex, southern Sweden, determined by UâPb and LuâHf |  | 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...by the secondary zirconosilicates catapleiite, zircon and gittinsite. Theoretical petrogenetic grid models...BASED on studies of the peralkaline IlĂmaussaq complex, South Greenland, Ussing (1912) introduced the |  | | 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; |  | | Journal (article/letter/editorial) | | interstitial phase. The primary HFSE minerals are zircon, monazite-(Ce), gagarinite-(Ce) and the pyrochlore...crystallization of alkali feldspar and HFSE-rich phases (zircon, monazite-(Ce), pyrochlore group). An alkali feldspar-rich... 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 |  | 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) | | mineralization consists of a mineral paragenesis composed of zircon, xenotime, monazite, Nb-Fe-W rutile, and Nb-Ti-YHREE-W-U...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...crystallization of adularia, xenotime, monazite, zircon, and rutile. This mineral paragenesis is characterized...Ercit 2005). They are generally characterized by complex crystal chemistry and often display metamictization |  | | 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 |  | | 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 |
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