 | | 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 |  | KĆ¼ster, Dirk, Romer, Rolf L., Tolessa, Dandena, Zerihun, Desta, Bheemalingeswara, K., Melcher, Frank, OberthĆ¼r, Thomas (2009) The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, UāPb 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, UāPb...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 lithiumācesiumā tantalum petrogenetic family. The Kenticha pegmatite...an internal geochemical differentiation of the pegmatite sheet proceeding from the lower zone (K/Rb ~36 |  | Mogessie, A., Krenn, K., Schaflechner, J., Koch, U., Egger, T., Goritchnig, B., Kosednar, B., Pichler, H., Ofner, L., Bauernfeind, D., Tadesse, S., Demessie, M. (2002) A geological excursion to the Mesozoic sediments of the Abay Basin (Blue Nile), recent volcanics of the Ethiopian main rift and basement rocks of the Adola Rea, Ethiopia. Mitteilungen der Ćsterreichischen Mineralogischen Gesellschaft, 147. | Journal (article/letter/editorial) | | MAIN RIFT AND BASEMENT ROCKS OF THE ADOLA REA, ETHIOPIA by A. Mogessie, K. Krenn, J. Schaļ¬echner, U...Addis Ababa University, Ethiopia 2Ethiopian Institute of Geological Surveys Ethiopia 43 44 1. GENERAL...INTRODUCTION The ļ¬eld excursion to Ethiopia took place from April 5 to 22, 2001. Ethiopia has a varied geology and...making up the Ethiopian plateau; ii) the Main Ethiopia Rift containing a number of lakes and geothermal...ļ¬elds and iii) the Adola gold belt including the Kenticha tantalum-bearing pegmatites (Fig. 1). Nine earth |  | | Journal (article/letter/editorial) | | (mainly Rwanda and the DR Congo), around the Kenticha mine (Ethiopia) and in the Alto Ligonha Province (Mozambique)...(Mozambique), the Arabian-Nubian Shield (Egypt, Ethiopia) and the Tantalite Valley pegmatites (southern...1992; ÄernĆ½ et al., 2005). The provenance of pegmatite magmas remains poorly understood. Based on a study...afļ¬liation and rare-element signature of the granite-pegmatite systemsā. Peraluminous granites and associated...Democratic Republic of the Congo (DRC), Mozambique, Ethiopia, Nigeria and Burundi (Table 1). Notably, the majority |  | Aurisicchio, Carlo, Conte, Aida M., Medeghini, Laura, Ottolini, Luisa, De Vito, Caterina (2018) Major and trace element geochemistry of emerald from several deposits: Implications for genetic models and classification schemes. Ore Geology Reviews, 94. 351-366 doi:10.1016/j.oregeorev.2018.02.001 | Journal (article/letter/editorial) | | distinguishes the emerald deposits related to granite-pegmatite intrusion from those controlled by tectonic structures...between pre-existing quartzāmuscovite or quartzātopaz greisens and ultramafic bodies (Grundmann and Morteani...occurs with ruby, chrysoberyl (BeAl2O4), sapphire, topaz, fluorite, margarite, muscovite, phenakite (Be2SiO4)...the phlogopitebearing contact zones, between pegmatite and surrounding Cr-bearing mafic-ultramafic rocks...pre-Karoo age. The genetic model for emerald-bearing pegmatite (Maria III and Niane) involves the intrusion of |  | | Report (issue) | | ....................................... 2 World Mine Production .......................................tsunami caused widespread 1 devastation across the region, as tens of thousands of people were killed, hundreds...Information Services Ltd., 2012). World Mine Production In 2011, world mine production of tantalum increased...in 2010. Rwanda accounted for 27 percent of total mine production in 2011; Brazil accounted for 20 percent;...Republic of the Congo [Congo (Kinshasa)], 15 percent; Ethiopia, 14 percent; China, 11 percent; Mozambique, 6 |  | | Journal (article/letter/editorial) | | overgrown by K-feldspar, muscovite, quartz and topaz megacrysts. The PT E increasing number and size...of magmatic plagioclase and crystallization of topaz megacrysts resulting from infiltration of Na- rich...characteristics of tin mineralization (e.g. co-occurrence of topaz, LiāFe mica and albite, high F, Li, CE Rb, Ga...(1976) suggested late Proterozoic ages based on the field relations, whereas El Gaby et PT E al. (1988,...the adjacent metasediments for a few meters. Pegmatite pockets, partially greisenized, occur locally |  | | Journal (article/letter/editorial) | | % 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...maintenance. Ta production at the massive Greenbushes pegmatite (Australia) has stopped, though Li production...start-up time for new operations. The Kenticha mine (Ethiopia) is a past producer that may re-enter production...studies on new developments) are required in any mine as price levels vary for each deposit and are dependent |  | Melcher, Frank, Graupner, Torsten, GƤbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, OberthĆ¼r, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalumā(niobiumātin) mineralisation in African pegmatites and rare metal granites: Constraints from TaāNb oxide mineralogy, geochemistry and UāPb 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...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)...presented for 13 rare-element granite NU and pegmatite districts in Africa, covering Archean, Paleoproterozoic |  | 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 LAāICPāMS UāPb 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...online xxxx Keywords: Dahongliutan rare metal pegmatite deposit Kunlun orogenic belt Columbite-(Fe) and...Dahongliutan is a medium-size LiāBeāTaāNb rare metal pegmatite deposit in the Tianshuihai terrane, West Kunlun...represents the emplacement age of the pegmatite dikes. The ore-hosting pegmatite dikes are intimately time-space...reserves in China, implying that the Dahongliutan pegmatite deposit may also have favorable oreforming conditions |  | | Journal (article/letter/editorial) | | tantalum deposit, metallogeny of rare metals, pegmatite, granite magmatism, alkaline magmatism, tantaloniobates...(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...4data obtained from the analog located in the same region rather than from the object itself are italicized;...complex; hāhydrothermal ore; nsānepheline syenite; pāpegmatite; tpātrachyte porphyry. The quantity of pegmatitic |  | | Journal (issue) | | Decade of Change A New Era for the Historic Coscuez Mine Esmeraldas Santa Rosa: Our Wealth is Green Rediscovery...More Exquisite Emeralds Magnificent Old Mine Emeralds 143 Mine Visit A Visit to Colombiaās āGreenā Emerald...acquiring the majority stake in the iconic Coscuez mine in Colombia. The 2015 Symposium focused on the governmentās...have also seen new discoveries of emeralds in Ethiopia and increased awareness of the green gem from...confidence in gem purchases now starts at the mine in the broader mine-to-market concept. Another major change |  | | Journal (issue) | | Sabbagh Gemology Gem Quality Emeralds from Southern Ethiopia Members Jean Claude Michelou Stephan Reif Gary...promotion of the colored gemstone sector in that region as well as strengthening the activities in Asia...on the gamut of colored gemstones, literally from mine-to-market, with detailed articles on the worldās...sector. It will also continue to provide its esteemed mine-to-market coverage, while expanding its audience...plastic trays to dozens of miners in the Tanga region of Tanzania in January 2017. (Photo: Robert Weldon |  | | Book | | crystals on large, well-formed grey graphite crystals, field of view 3 cm - Philip Hitge specimen, Bruce Cairncross...runs from Madagascar through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa,...countries are among the finest in the world. The region and its gems are particularly dear to my family...most renowned gemstones from East Africa, this region is also host to some of the world's finest examples...several other varieties of gemstone occur in the region and, while perhaps not as popular, these too have |  | | Journal (issue) | | INVERELL BLUE By Antoinette Rahn REGULAR COLUMNS Field Notes ........................... 6 Earth Science...winner, Marie Curie. Extracted from the Musonoi Mine, Kolwezi Dist., the Democratic Republic of the Congo...RandG_official rockngem.com 4 ROCKNGEM.COM FIELD NOTES This is the usual, but never boring, view...important. Additionally, as I mentioned in the Field Notes section of the July edition of Rock & Gem....com 877.793.6636 NEW OPAL SHIPMENT IN FROM ETHIOPIA THIS MAY BE THE BRIGHTEST PARCEL WEāVE EVER RECEIVED |  | Giuliani, Gaston, Groat, Lee A., Marshall, Dan, Fallick, Anthony E., Branquet, Yannick (2019) Emerald Deposits: A Review and Enhanced Classification. Minerals, 9 (2) 105 doi:10.3390/min9020105 | Journal (article/letter/editorial) | | type, in terms of production, is the desilicated pegmatite related type that formed via the interaction of...of previous beryllium mineralization, such as pegmatite intrusions in mafic-ultramafic rocks. Such new...ct. Insufu rough emerald extracted from the Kagem mine in 2015. Lastly, on the 2th of October, the remarkable...(āthe lion elephantā) was extracted from the same mine [3]. Other giant crystals have been discovered in...emerald crystals was discovered in the CarnaĆba mine, Brazil; the specimen weighed 341 kg with 1.7 million |  | | Journal (article/letter/editorial) | | PEGMATITE Erste Ćsterreichische Arbeitstagung MontanuniversitƤt Leoben 11. April 2014 Zusammenfassung...Melcher MITT.ĆSTERR.MINER.GES. 160 (2014) PEGMATITE - ERSTE ĆSTERREICHISCHE ARBEITSTAGUNG von Johann...MontanuniversitƤt Leoben die 1. Arbeitstagung zum Thema Pegmatite statt. Die Veranstaltung wurde vom Department...Geologie und LagerstƤttenlehre) organisiert. Pegmatite sind sowohl aus wirtschaftlichen als auch wissenschaftlichen...hochgradiger Metamorphose gegenĆ¼ber. Gerade die Pegmatite in den Ostalpen stellen ein Musterbeispiel fĆ¼r |  | 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 UāPb isotopic dating of columbiteātantalite by LAāICPāMS. Ore Geology Reviews, 65. 979-989 doi:10.1016/j.oregeorev.2014.07.008 | Journal (article/letter/editorial) | | LAāICPāMS Matrix effect Nanping pegmatite Altai No.3 pegmatite Dahe pegmatite Yichun a b s t r a c t Columbiteātantalite...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...the coltan samples from Altai No.3 pegmatite (713-79), Yichun topaz-lepidolite granite (Yi-1) and Huangshan...established analytical protocol, we date the Nanping pegmatite (NP155), a main NbāTa deposit in China without |  | | Journal (issue) | | Age Dating of Zircon Inclusions in Sapphire Ethiopia Field Report 2019 Tucson Report Spring 2019 VOLUME...table facets. FIELD REPORTS 72 p. 135 Land of Origins: A Gemological Expedition to Ethiopia Wim Vertriest...opal, and emerald mining and trading areas of Ethiopia. REGULAR FEATURES 29 The Dr. Edward J. GĆ¼belin...in opal ā¢ Trapiche-like ruby from the Batakundi mine in Kashmir ā¢ Sapphire inclusion with rutile āsilkā...Moonstone jewelry ā¢ Oregon sunstone ā¢ Potentate mine sapphire update ā¢ āRainbow latticeā feldspar ā¢ Responsibly |  | | Report (issue) | | FRONTISPIECE: Historic pump at the Wodgina tantalumātin mine. Brought from Port Hedland by camel train about...manganotantalite crystals from Moolyella, Pilbara region. Simpson Collection, Western Australian Museum........................ 24 Regional rare-metal pegmatite zoning and lithogeochemical anomalies ................................................... 25 Pegmatite dimensions and structure .............................. 63 Bernic Lake tantalumālithiumācaesium mine ............................................... |  | Bhandari, Sushmita, Qin, Kezhang, Zhou, Qifeng, Evans, Noreen J. (2022) Geological, Mineralogical and Geochemical Study of the Aquamarine-Bearing Yamrang Pegmatite, Eastern Nepal with Implications for Exploration Targeting. Minerals, 12 (5) 564 doi:10.3390/min12050564 | Journal (article/letter/editorial) | | Geochemical Study of the Aquamarine-Bearing Yamrang Pegmatite, Eastern Nepal with Implications for Exploration...Geochemical Study of the Aquamarine-Bearing Yamrang Pegmatite, Eastern Nepal with Implications for Exploration...iggcas.ac.cn Abstract: The Yamrang Pegmatite in the Ikhabu Pegmatite Field, Eastern Nepal is Nepalās primary...detailed mineralogy and whole rock granite and pegmatite geochemistry, and major and trace element data...order to classify the aquamarine-bearing Yamrang Pegmatite, elucidate beryl-saturation processes and evaluate |  | | Journal (article/letter/editorial) | | Keppler, 1997; Linnen, 1998; London, 2008) and field evidences in pegmatites (Dewaele et al., 2015) and...obtained from the ancient open pit of the Penouta mine (Fig. 1), corresponding to the apical zone. Whole...existence of these stages has been supported by field and geochemical evidence and also by a fluid inclusion...Fluid evolution in the zoned rare-element pegmatite field at Cap de Creus, Catalonia, Spain. Canadian...(1995) Nb-Ta- minerals from the Cap de Creus pegmatite field, eastern Pyrenees: distribution and geochemical |  | | Journal (issue) | | danburite from Namalulu, Tanzania|Emerald from Ethiopia|Vivid purplish pink fluorite from Illinois, USA|...Mountains of southwest Utah, USA. The Ruby Violet mine was the only commercial source of gem-quality red...El Guanaco in the Taltal area of the Antofagasta Region, Chile. He kindly donated a 1.45 ct stone to Gem-A...mined from granitic pegmatites in the Morogoro region of central Tanzania (Chadwick and Laurs, 2008)...several weak bands were recorded in the visible region at approximately 525, 567, 577, 584, 732, 744 and |  | Garate-Olave, Idoia, Roda-Robles, EncarnaciĆ³n, 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...columbite-tantalite group minerals; cassiterite; aplite-pegmatite; U-Pb geochronology; Tres Arroyos; Central Iberian...within individual pegmatite bodies and regional magma fractionation trends across pegmatite fields (e.g., |  | | Journal (article/letter/editorial) | | processes. Keywords Tin granite . Rare element pegmatite . Tin province . Variscan orogeny . Crustal melting...spatial pattern. For areas of major tin deposits or pegmatite swarms, not all occurrences are shown to avoid...um (LCT) type and spodumenebearing muscovite pegmatite type (ÄernĆ½ and Ercit 2005). Extensive melting...W granites (Fig. 4c), such as the Brazil Lake pegmatite and the East Kemptville granite in Nova Scotia...different thermomagmatic events affecting the same region at different times. In the Erzgebirge, for instance |
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