 | Küster, Dirk, Romer, Rolf L., Tolessa, Dandena, Zerihun, Desta, Bheemalingeswara, K., Melcher, Frank, Oberthür, Thomas (2009) The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, U–Pb 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, U–Pb...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 lithium–cesium– tantalum petrogenetic family. The Kenticha pegmatite...an internal geochemical differentiation of the pegmatite sheet proceeding from the lower zone (K/Rb ~36 |  | | 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 |  | 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 Österreichischen Mineralogischen Gesellschaft, 147. | Journal (article/letter/editorial) | | MAIN RIFT AND BASEMENT ROCKS OF THE ADOLA REA, ETHIOPIA by A. Mogessie, K. Krenn, J. Schaflechner, U...Addis Ababa University, Ethiopia 2Ethiopian Institute of Geological Surveys Ethiopia 43 44 1. GENERAL...INTRODUCTION The field 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...fields and iii) the Adola gold belt including the Kenticha tantalum-bearing pegmatites (Fig. 1). Nine earth |  | | Journal (article/letter/editorial) | | the PanAfrican Rocks of the Adola Area, Southern Ethiopia Solomon Tadesse Depnutnienf of Geology and Geophysics...Adola volcano-sedimentary sequence, in southern Ethiopia. Two major mineralized belts can be recognized:...recognized: the Megado ('Gold Belt') and the Kenticha Belts. The Kenticha Belt is also known for its rare metal...exploration programme Key words: Adola, gold, Kenticha, Lega Dembi, Pan-African, rare metal, Sakaro....placers, have been reported from various regions in Ethiopia. However, the Adola Goldfield is the only one |  | | Report (issue) | | brucite of yore from the Tilly Foster mine in New York or Wood’s Chrome mine in Pennsylvania. In that the new...suggests material found in 2005 in the N’Chwaning III mine in South Africa, but N’Chwaning brucite is graywhite...fine cerussite specimens from the old Monteponi mine, Sardinia, Italy, which Tomek Praszkier of Spirifer...finds in the 1980s in an old, presumably unnamed mine on the property of the Piquín farmhouse in Córdoba...little things from the Jeffrey mine, Asbestos, Quebec: the enormous asbestos mine closed for good at the outset |  | | 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; Černý et al., 2005). The provenance of pegmatite magmas remains poorly understood. Based on a study...affiliation and rare-element signature of the granite-pegmatite systems”. Peraluminous granites and associated...Democratic Republic of the Congo (DRC), Mozambique, Ethiopia, Nigeria and Burundi (Table 1). Notably, the majority |  | | Journal (article/letter/editorial) | | evolution of the Neoproterozoic Adola Belt of southern Ethiopia: evidence for a Wilson Cycle process and implications...September 1995 Abstract The Adola Belt of southern Ethiopia comprises three major lithotectonic units: (i)...rocks and associated pelitic metasediments of the Kenticha terrain; (ii) high-grade gneisses and schists...continental margin and formation of ocean floor in the Kenticha Terrain, Wdirected subduction, arc development... Introduction The A d o l a Belt of southern Ethiopia (Fig. 1 ) is one of the major Neoproterozoic shear |  | | Journal (article/letter/editorial) | | Southern Ethiopia Tadesse Yihunie', Mamoru Adachi2 and Makoto Takeuchi2 Geological Survey of Ethiopia, P.O...O. Box 2302, Addis Abeba, Ethiopia, E-mail: yihunie63yahoo.com Department of Earth and Planetary Sciences...constitute the Kenticha, Alghe and Bulbul litho-tectonic domains in the Negele area of southern Ethiopia. Structural...relationships in semi-pelitic schistdgneisses of the Kenticha and Alghe domains, three episodes of metamorphic...590-640"C, and pressures of 4-5 kb and &7 kb in the Kenticha and Alghe domains, respectively. These results |  | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, Oberthür, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb 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 |  | Graupner, T., Melcher, F., Gäbler, H.-E., Sitnikova, M., Brätz, 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) | | during progressive evolution of the melt in a pegmatite body (either Nb ? Ta or Fe ? Mn fractionation...mineral-melt partitioning during crystallization of the pegmatite body and by secondary hydrothermal or weathering...causing addition, loss or redistribution of REE. Pegmatite bodies may contain up to several generations of...provide constraints on the genesis of rare-element pegmatite systems. Furthermore, it may be used as a valuable...LCT pegmatite locations of central and southern Africa. These include: (1) the Homestead pegmatite, Tantalite |  | | Report (issue) | | ............................................M24 Mine Waste Characteristics ........................................................................M27 Mine Closure ..........................................regional lithium-cesium-tantalum rare-metalbearing pegmatite zoning above a parental granite.................zoned lithium-cesium-tantalum rare-metal-bearing pegmatite..............................................................M21 M13. Bar charts showing global mine production of niobium and tantalum, from 2000 to |  | | Journal (article/letter/editorial) | | Structure of Precambrian Rocks in the Adola Goldfield (Ethiopia) based on Two Generations of Interference Pattern...Institute of Geological Survey of Ethiopia, P.O. Box 5580, Addis Ababa (Ethiopia) (Received December 71 1987;...structure of Precambrian rocks in the Adola Goldfield (Ethiopia) based on two generations of interference pattern...mapped in Precambrian rocks of the Adola Goldfield (Ethiopia). The F2 phase folded pre-existing planes (D1)...been active in the !ate Precambrian of southern Ethiopia. Introduction It is now generally accepted that |  | | Journal (article/letter/editorial) | | southern Ethiopia Lulu Tsige a , Mohamed G. Abdelsalam b,∗ a Geological Survey of Ethiopia, Department...Regional Mapping, Addis Ababa, P.O. Box 2302, Ethiopia b The University of Texas at Dallas, Department...metamorphic data from the Bulbul Belt in southern Ethiopia indicating that the latest phase of the Neoproterozoic...migmatitic layering that is not evident elsewhere in the region. This older planar fabric is discordantly overprinted...the Neoproterozoic N-trending belts in southern Ethiopia were roots of northward expulsion of the Arabian-Nubian |  | | Journal (article/letter/editorial) | | the ophiolitic fold and thrust belts of southern Ethiopia: constraints on the tectonic regime during the...Neoproterozoic ophiolitic belts in southern Ethiopia—Megado, Kenticha, Moyale-El Kur and Bulbul. The mafic rocks...geochemistry, similar to that reported from the Kenticha Belt. Several samples from the Geleba area and...tectonic evolution of the Neoproterozoic of southern Ethiopia. © 2002 Elsevier Science B.V. All rights reserved...157–183 1. Introduction The Precambrian of southern Ethiopia, which consists of high-grade ortho- and para-gneisses |  | | Report (issue) | | crisp despite partial dehydration) from the Margabal mine, Entraygues, Aveyron Department, France. 1 ==...======= Torbernite, 5.3 cm, from the Margabal mine, Entraygues, Aveyron, France. Trinity Minerals specimen...specimen and photo. This small uranium mine, in a small deposit discovered during a survey by the French...locality began in June 1997 when, somewhere in the old mine, about 1,000 fine specimens were recovered, with...$250. Vanadinite, 2.3 cm, from the North Geronimo mine, La Paz County, Arizona. Key’s Minerals specimen |  | 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...metamorphic 3 conditions) between pre-existing quartz–muscovite or quartz–topaz greisens and ultramafic bodies...(BeAl2O4), sapphire, topaz, fluorite, margarite, muscovite, phenakite (Be2SiO4), bromellite (BeO) and quartz...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 |  | 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 LA–ICP–MS U–Pb 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 Li–Be–Ta–Nb 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) | | % 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 |  | | Journal (article/letter/editorial) | | K-feldspar and D muscovite that are variably overgrown by K-feldspar, muscovite, quartz and topaz megacrysts...extensive growth of large Kfeldspar, quartz and muscovite megacrysts at the expense of the albite/oligoclase...(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...K-feldspar and muscovite. The albite/oligoclase framework is variably overgrown by K-feldspar, muscovite and quartz |  | | Journal (article/letter/editorial) | | Orogeny: Evidence from the Bulbul Shear Zone, south Ethiopia Mohamed G. Abdelsalam a,⁎, Lulu Tsige b , Tadesse...Regional Mapping, Geological Survey of Ethiopia, Addis Ababa, Ethiopia Received 20 August 2007; received in...Neoproterozoic–Early Paleozoic Bulbul Shear Zone in southern Ethiopia is marked by sheared ophiolites at the interface...rights reserved. Keywords: Precambrian; Southern Ethiopia; Bulbul Shear Zone; Terrane rotation; East African...African Orogen 1. Introduction Southern Ethiopia is underlain by Neoproterozoic–Early Paleozoic rocks |  | | Journal (article/letter/editorial) | | Rocks of the Neoproterozoic Adola Belt of Southern Ethiopia Bisrat Yibas Geology department, University of...quartz arenites) fall in the Passive Margin (I'M) field. The trace element characteristics of these rocks...oceanic tlioleiites and even boninites in the source region. The REE patterns show three distinct groupings;...1).It forms part of the Precambrian of southern Ethiopia where the Arabian-Nubain shield and the Mozambique...These, from west to east, are the Megado and the Kenticha sub-belts. The Megado sub-belt consists of tholeiitic |  | | Journal (article/letter/editorial) | | geology of the Lega Dembi gold deposit, southern Ethiopia: implications for Pan-African gold exploration...Dembi deposit is the largest gold producer in Ethiopia. It is situated in late-Precambrian metamorphosed...lateProterozoic Adola granite-greenstone terrane in southern Ethiopia. The lode-gold mineralization occurs in a N-S...belts. The Lega Dembi gold mine in the Sidamo region of southern Ethiopia is the largest gold producer...lithostratigraphic and structural evolution of the region have been proposed. However, because of the relatively |  | Abdel Gawad, Ahmed E., Ene, Antoaneta, Skublov, Sergey G., Gavrilchik, Alexandra K., Ali, Mohamed A., Ghoneim, Mohamed M., Nastavkin, Aleksey V. (2022) Trace Element Geochemistry and Genesis of Beryl from Wadi Nugrus, South Eastern Desert, Egypt. Minerals, 12 (2) 206 doi:10.3390/min12020206 | Journal (article/letter/editorial) | | East southward through Egypt, Sudan, Eritrea, Ethiopia, Somalia, Saudi Arabia, Yemen, Oman and Jordan...composed of quartz, K-feldspar, plagioclase, muscovite and subordinate They are essentially composed...composed of quartz, K-feldspar, plagioclase, muscovite and subordinate columbite, fergusonite, xenotime...metagaband graphite schists.on These rocks were byby muscovite granite and pegmatites and bros are obducted mylonites...dark grey colors and NW– processes resulted in huge mine dumps containing significant amounts of beryl. SE |  | | 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 Colombia’s “Green” Emerald...acquiring the majority stake in the iconic Coscuez mine in Colombia. The 2015 Symposium focused on the government’s...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 |  | Wise, Michael A., Harmon, Russell S., Curry, Adam, Jennings, Morgan, Grimac, Zach, Khashchevskaya, Daria (2022) Handheld LIBS for Li Exploration: An Example from the Carolina Tin-Spodumene Belt, USA. Minerals, 12 (1) 77 doi:10.3390/min12010077 | Journal (article/letter/editorial) | | minerals, rocks, soils, and brines in-situ in the field. In addition to being used in many products essential...containing spodumene, K-feldspar, albite, quartz, muscovite, and beryl. We illustrate how handheld LIBS analysis...real-time Li analysis in the field at a historically important CTSB pegmatite locality in Gaston County...ratios and Li contents of muscovite and rapidly determine the degree of pegmatite fractionation. This study...compositional information for pegmatites during a Li pegmatite exploration program. Academic Editor: Paul Alexandre |
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