 | | Journal (article/letter/editorial) | | Pegmatitic Rocks and Minerals in the Kenticha Belt, Southern Ethiopia: Implication to Geological Setting...Ababa University, P. 0.Box 1176, Addis Ababa, Ethiopia (Manuscript received April 18, 2000; accepted...pegmatites, alaskites) and minerals from the Kenticha pegmatite field. The data shed light on the evolution...granite-pegmatites and associated mineralization in the Kenticha belt. The complex mineralization of commercial...signatures of the suite of felsic rocks of the Kenticha belt are predominantly similar to those generated |  | | Journal (article/letter/editorial) | | from carbonatites and peralkaline igneous rocks. Columbite-group minerals (CGM) account for the majority...(mainly Rwanda and the DR Congo), around the Kenticha mine (Ethiopia) and in the Alto Ligonha Province (Mozambique)...(Zimbabwe) and the Jos Plateau (Nigeria);  Mn-rich columbite-tantalite is typical of the Alto Ligonha Province...(Mozambique), the Arabian-Nubian Shield (Egypt, Ethiopia) and the Tantalite Valley pegmatites (southern...Namibia) and  Large compositional variations through Fe-Mn fractionation, followed by Nb-Ta fractionation are |  | KĂŒster, Dirk, Romer, Rolf L., Tolessa, Dandena, Zerihun, Desta, Bheemalingeswara, K., Melcher, Frank, OberthĂŒr, Thomas (2009) The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, UâPb age and Ta mineralization. Mineralium Deposita, 44 (7) 723-750 doi:10.1007/s00126-009-0240-8 | Journal (article/letter/editorial) | | 1007/s00126-009-0240-8 ARTICLE The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, UâPb...Springer-Verlag 2009 Abstract The Kenticha rare-element pegmatite, a globally important tantalite source...source in the Neoproterozoic Adola Belt of southern Ethiopia, is a highly fractionated, huge (2,000 m long...rareelement pegmatite class and belongs to the lithiumâcesiumâ tantalum petrogenetic family. The Kenticha pegmatite...an internal geochemical differentiation of the pegmatite sheet proceeding from the lower zone (K/Rb ~36 |  | Melcher, Frank, Graupner, Torsten, GĂ€bler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, OberthĂŒr, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalumâ(niobiumâtin) mineralisation in African pegmatites and rare metal granites: Constraints from TaâNb oxide mineralogy, geochemistry and UâPb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | | Schist Belt (western Zimbabwe) 4.3.3. Orange River Pegmatite Belt (Namibia, South Africa) AC 4.3.3.1. Radiometric...data 4.4.1.2. Mineralogy 4.4.2. Pegmatites of Ethiopia and Somalia 4.4.2.1. Radiometric data 4.4.2.2...1.2. Mineralogy NU 5. Mineral chemistry of columbite-tantalite, tapiolite, wodginite and ixiolite in...3.2. Kamativi Schist Belt 5.3.3. Orange River Pegmatite Belt 5.4. Late Neoproterozoic to early Paleozoic...the Eastern Desert (Egypt) 5.4.2. Pegmatites of Ethiopia and Somalia 5.4.3. Alto-Ligonha Province (Mozambique) |  | Graupner, T., Melcher, F., GĂ€bler, H.-E., Sitnikova, M., BrĂ€tz, H., Bahr, A. (2010) Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data. Mineralogical Magazine, 74 (4) 691-713 doi:10.1180/minmag.2010.074.4.691 | Journal (article/letter/editorial) | | 691â713 Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data T. GRAUPNER1,*...(REE) concentrations and distribution patterns of columbite-tantalite minerals from Ta-ore provinces worldwide...chondritenormalized REE distribution patterns are defined for columbite-group minerals (CGM) from lithiumcaesium-tantalum...progressive evolution of the melt in a pegmatite body (either Nb ? Ta or Fe ? Mn fractionation lines, or both)...forensic tool). K EY WORDS : LCT family pegmatites, columbite-tantalite, REE geochemistry, LA-ICP-MS data. |  | Yan, Qing-He, Qiu, Zeng-Wang, Wang, He, Wang, Min, Wei, Xiao-Peng, Li, Pei, Zhang, Rong-Qing, Li, Cong-Ying, Liu, Jian-ping (2018) Age of the Dahongliutan rare metal pegmatite deposit, West Kunlun, Xinjiang (NW China): Constraints from LAâICPâMS UâPb dating of columbite-(Fe) and cassiterite. Ore Geology Reviews, 100. 561-573 doi:10.1016/j.oregeorev.2016.11.010 | Journal (article/letter/editorial) | | com/locate/oregeo Age of the Dahongliutan rare metal pegmatite deposit, West Kunlun, Xinjiang (NW China): Constraints...Constraints from LAâICPâMS UâPb dating of columbite-(Fe) and cassiterite Qing-He Yan a,c, Zeng-Wang Qiu...Keywords: Dahongliutan rare metal pegmatite deposit Kunlun orogenic belt Columbite-(Fe) and cassiterite U-Pb...Dahongliutan is a medium-size LiâBeâTaâNb rare metal pegmatite deposit in the Tianshuihai terrane, West Kunlun...ages of columbite-(Fe) and cassiterite are reported to constrain the metallogenic age. Columbite-(Fe) (with |  | | Journal (article/letter/editorial) | | due in part to historic influx of âconflictâ columbite-tantalite concentrate, or âColtan,â that caused...% from tin slag refining and 10 % from secondary mine concentrates. Due to rapid industrialisation and...Canada account for about 92 and 7 % of Nb world mine production, respectively. Since the bulk of the...significant deposits of Ta and Nb contain pyrochlore, columbite-tantalite, fersmite, loparite and strĂŒverite....Rare-elements . Strategic metals . Pyrochlore . Columbite . Tantalite Introduction Tantalum (Ta) and niobium |  | | Journal (article/letter/editorial) | | tantalum deposit, metallogeny of rare metals, pegmatite, granite magmatism, alkaline magmatism, tantaloniobates...albite-spodumene rare-metal pegmatites with tantalite-columbite, microlite, and ixiolite in the Ancient Gneiss...tantaloniobates. They are usually tantalite and/or Ta-rich columbite, but a noticeable, sometimes decisive contribution...(22) Motzfeldt; (23) Tanbreez; (24) Crevie; (25) Kenticha; (26) Three Alloes; (27) Tastyg; (28) Morrua;...Kamativi Manono-Kitotolo Motzfeldt Tanbreez Crevie Kenticha Three Alloes Tastyg Morrua Marropino Nanping Alberta |  | | Journal (article/letter/editorial) | | PEGMATITE Erste Ăsterreichische Arbeitstagung MontanuniversitĂ€t Leoben 11. April 2014 Zusammenfassung...Melcher MITT.ĂSTERR.MINER.GES. 160 (2014) PEGMATITE - ERSTE ĂSTERREICHISCHE ARBEITSTAGUNG von Johann...MontanuniversitĂ€t Leoben die 1. Arbeitstagung zum Thema Pegmatite statt. Die Veranstaltung wurde vom Department...Geologie und LagerstĂ€ttenlehre) organisiert. Pegmatite sind sowohl aus wirtschaftlichen als auch wissenschaftlichen...hochgradiger Metamorphose gegenĂŒber. Gerade die Pegmatite in den Ostalpen stellen ein Musterbeispiel fĂŒr |  | | Journal (article/letter/editorial) | | âcritical materialsâ or âstrategic resources.â Field relationships, mineral chemistry, and experimental...aerospace, automotive, incompatible elements (high-field-strength and large-ion and electronic devices. lithophile...resource et al. 2012 this issue). This type of pegmatite contains baseâ: South America has reserves of...Southeast Asia and B). For example ores in the Tanco pegmatite (Manitoba, (10%), Russia and the Middle East (10%)...bulk are the Mibra operation in Brazil, Kenticha in Ethiopia, continental crust, which contains 16 ppm |  | | Journal (article/letter/editorial) | | Abstract Tapiolite [FeTa2O6] and columbite-group minerals [(Fe,Mn)(Ta,Nb)2O6] are common Nb-Ta-bearing...compositional gap. In this study, tapiolite and columbite-group minerals (CGM) were crystallized from water-saturated...a size as small as 500 nm were analyzed with a field emission gun (FEG) electron microprobe. The results...between a rutile-structured component Fe3+TaO4 and (Fe,Mn)Ta2O6. The experimental CGM-tapiolite compositional...crystallization processes in highly evolved and pegmatite-forming magmas. Keywords: Crystallization experiments |  | | Journal (article/letter/editorial) | | Assessing copper fertility of intrusive rocks using field portable X-ray fluorescence (pXRF) dataâAyesha Ahmed...skarn-porphyry Cu-Au-Fe deposit, eastern Transbaikal region, Russia: Genetic implicationsâV.A. Kovalenker,...alluvial placers of the Krasnovishersky district (Ural region)â E.A. Vasilev, I.V. Klepikov, and L.I. Lukianova...Leng, and Wei Gao article 104180 Formation of columbite and microlite after alteration of Nb- and Ta-bearing...Ta-bearing biotite from the Lizaizhai pegmatite (Guangning ore district, Guangdong, south China): Identification |  | Che, Xu-Dong, Wu, Fu-Yuan, Wang, Ru-Cheng, Gerdes, Axel, Ji, Wei-Qiang, Zhao, Zhen-Hua, Yang, Jin-Hui, Zhu, Ze-Ying (2015) In situ UâPb isotopic dating of columbiteâtantalite by LAâICPâMS. Ore Geology Reviews, 65. 979-989 doi:10.1016/j.oregeorev.2014.07.008 | Journal (article/letter/editorial) | | com/locate/oregeorev In situ UâPb isotopic dating of columbiteâtantalite by LAâICPâMS Xu-Dong Che a,â, Fu-Yuan...Keywords: Columbiteâtantalite (coltan) UâPb dating LAâICPâMS Matrix effect Nanping pegmatite Altai No...No.3 pegmatite Dahe pegmatite Yichun a b s t r a c t Columbiteâtantalite (Coltan) is the most important...commonly occurring in rare metal granite and pegmatite, alkaline granite, syenite and carbonatite. Its...Namibia (Coltan139), the coltan sample from Dahe pegmatite (SNNT) has a weighted mean 206Pb/238U age of 363 |  | Garate-Olave, Idoia, Roda-Robles, EncarnaciĂłn, Gil-Crespo, Pedro Pablo, Pesquera, Alfonso, Errandonea-Martin, Jon (2020) The Tres Arroyos Granitic Aplite-Pegmatite Field (Central Iberian Zone, Spain): Petrogenetic Constraints from Evolution of Nb-Ta-Sn Oxides, Whole-Rock Geochemistry and U-Pb Geochronology. Minerals, 10 (11) 1008 doi:10.3390/min10111008 | Journal (article/letter/editorial) | | Article The Tres Arroyos Granitic Aplite-Pegmatite Field (Central Iberian Zone, Spain): Petrogenetic... Abstract: Abundant Li-Cs-Ta aplite-pegmatite dykes were emplaced in the western Central Iberian...aplite-pegmatite dykes from the Tres Arroyos area, which constitute a zoned pegmatitic field related...oxides from Tres Arroyos correspond to columbite-(Fe), columbite-(Mn) and cassiterite. Niobium-Ta oxides...oxides show a marked increase in the Mn/(Mn+Fe) ratio from the barren aplite-pegmatites up to the Li-rich bodies |  | Fosso Tchunte, Periclex Martial, Tchameni, Rigobert, AndrĂ©-Mayer, Anne-Sylvie, Dakoure, Hilaire Somtebda, Turlin, François, Poujol, Marc, Nomo, Emmanuel Negue, Saha Fouotsa, Alliance Nicaise, Rouer, Olivier (2018) Evidence for Nb-Ta Occurrences in the Syn-Tectonic Pan-African Mayo Salah Leucogranite (Northern Cameroon): Constraints from Nb-Ta Oxide Mineralogy, Geochemistry and U-Pb LA-ICP-MS Geochronology on Columbite and Monazite. Minerals, 8 (5) 188 doi:10.3390/min8050188 | Journal (article/letter/editorial) | | Geochemistry and U-Pb LA-ICP-MS Geochronology on Columbite and Monazite Periclex Martial Fosso Tchunte 1...rare-element-bearing mineral is represented by columbite-group minerals (CGM) and other Nb-Ta-oxides (Nb-rutile...minerals). The CGM is classified as Mn-columbite, with Ta# and Mn# ratios increasing from core to rim...The latest stage (CGM-II) is expressed as a Ta-rich Mn hydrothermal CGM episode represented as rims and/overgrowths...cleavage planes of muscovite. The U-Pb dating of columbite and monazite of the Mayo Salah leucogranite indicates |  | Gonçalves, , Melgarejo, , Alfonso, , Amores, , Paniagua, , Neto, , Morais, , CamprubĂ, (2019) The Distribution of Rare Metals in the LCT Pegmatites from the GiraĂșl Field, Angola. Minerals, 9 (10) 580 doi:10.3390/min9100580 | Journal (article/letter/editorial) | | Rare Metals in the LCT Pegmatites from the GiraĂșl Field, Angola Antonio Olimpio Gonçalves 1 , Joan-Carles...Abstract: The GiraĂșl granitic pegmatite field in Angola is composed of five pegmatite types, the most evolved...evolved belong to the beryl-columbite, beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically...pegmatites are rich in Nb-Ta oxide minerals and the field has a moderate interest for critical elements such...the evolution of the pegmatites and within each pegmatite body from border to inner zones, and especially |  | Legros, HĂ©lĂšne, Mercadier, Julien, Villeneuve, Johan, Romer, Rolf L., Deloule, Etienne, Van Lichtervelde, Marieke, Dewaele, Stijn, Lach, Philippe, Che, Xu-Dong, Wang, Ru-Cheng, Zhu, Ze-Ying, Gloaguen, Eric, Melleton, JĂ©rĂ©mie (2019) U-Pb isotopic dating of columbite-tantalite minerals: Development of reference materials and in situ applications by ion microprobe. Chemical Geology, 512. 69-84 doi:10.1016/j.chemgeo.2019.03.001 | Journal (article/letter/editorial) | | Accepted Manuscript U-Pb isotopic dating of columbite-tantalite minerals: Development of reference materials... Villeneuve, et al., U-Pb isotopic dating of columbite-tantalite minerals: Development of reference materials... ACCEPTED MANUSCRIPT U-Pb isotopic dating of columbite-tantalite minerals: development of reference materials...Abstract Columbite-tantalite group minerals are the most common Nb-Ta minerals. Columbite-tantalite...common Pb contents. In situ isotopic dating of columbite-tantalite by LA-ICP-MS or SIMS requires certified |
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