 | | Journal (article/letter/editorial) | | High-Ca, low-alkali carbonatite volcanism at Fort Portal, Uganda Daniel S. Barker 1 and Peter H. Nixon 2 ...Abstract. A Quaternary volcanic field at Fort Portal, SW Uganda, contains approximately 50 vents that erupted...SW of Fort Portal. The groundmass of fresh carbonatite lava consists of tabular calcite, spurrite, periclase...readily altered; where meteoric water had access, spurrite and periclase are lacking, and some calcite is...by crustal rock fragments and xenocrysts. At Fort Portal, eruption o f a C a O - M g O CO2-SiO 2 - P 2 |  | | Journal (article/letter/editorial) | | among others. Fresh carbonatite lavas at Fort Portal, Uganda (Barker and Nixon 1989), and Oldoinyo Lengai...Tanzania (Dawson et al. 1995) contain groundmass spurrite, indicating that carbonatite magma is capable...periclase; prv perovskite; sell sellaite; spurr spurrite; ttn titanite; wo wollastonite; zrn zircon 20%... liq Mg2 SiO4 forsterite Ca5 SiO4 2 CO3 spurrite SiO2 2MgO periclase NaAlSiO4 nepheline...carbonatites containing periclase, monticellite, spurrite, larnite polymorphs or melilite. The zircon and |  | Campeny, Marc, Kamenetsky, Vadim S., Melgarejo, Joan C., Mangas, José, Manuel, José, Alfonso, Pura, Kamenetsky, Maya B., Bambi, Aurora C.J.M., Gonçalves, Antonio O. (2015) Carbonatitic lavas in Catanda (Kwanza Sul, Angola): Mineralogical and geochemical constraints on the parental melt. Lithos, 232. 1-11 doi:10.1016/j.lithos.2015.06.016 | Journal (article/letter/editorial) | | carbonatite lavas have been identified in this region and considering the mineralogical, textural and...African Rift area (Woolley, 2001) such as Fort Portal, Uganda (von Knorring and Du Bois, 1961; Nixon and...carbonatite lavas located in the western African MA margin, are in a tectonic region affected by the break-up...mines in The volcanic activity in the Catanda region has never been precisely dated. Silva and Pereira...periclase, brucite and scarce grains of zirconolite, spurrite and very rare NU oldhamite. Groundmass fluorapatite |  | | Journal (article/letter/editorial) | | s Geochemistry and petrogenesis of the Fort Portal, Uganda, extrusive carbonatite G. Nelson Eby a,⁎...Quaternary Fort Portal volcanic field occurs at the northern end of the Western Rift in Uganda. The eruptive...Quaternary Fort Portal volcanic field, is the subject of this paper. The Quaternary Fort Portal and Kasekere...Kasekere volcanic fields of southwest Uganda (Fig. 1) were first mapped and described by von Knorring and Du...associated with the western branch of the East African rift system. Fort Portal and Kasekere are part |  | Bailey, Ken, Lloyd, Felicity, Kearns, Stuart, Stoppa, Francesco, Eby, Nelson, Woolley, Alan (2005) Melilitite at Fort Portal, Uganda: Another dimension to the carbonate volcanism. Lithos, 85 (1) 15-25 doi:10.1016/j.lithos.2005.03.019 | Journal (article/letter/editorial) | | elsevier.com/locate/lithos Melilitite at Fort Portal, Uganda: Another dimension to the carbonate volcanism...Abstract Because the calciocarbonatite lavas at Fort Portal were the first ever described they have received...contain melilitite previously unreported from Fort Portal. The rock is a mix of crust and mantle debris...ultramafic-carbonate volcanism to the south, in Uganda, and parallels with that in Italy. D 2005 Elsevier...Introduction Fort Portal, a small Quaternary volcanic field at the northern end of the Western Rift igneous |  | | Journal (article/letter/editorial) | | effusive magmatic association of Katwe-Kikorongo, SW Uganda F. E. Lloyd1;2 , A. R. Woolley3, F. Stoppa4 , and...melilitite-carbonatite tephra. Higher Al2O3 distinguishes Fort Portal carbonatite xenocrysts and some contain high...genesis of Katwe-Kikorongo olivine melilitite and Fort Portal carbonatite involves a 300 F. E. Lloyd et...kamafugite-carbonatite province of south west Uganda in the western branch of the East African Rift (Fig. 1)...1996). The effusive calcio-carbonatites of the Fort Portal ®eld lie 75 km to the north and are well documented |  | | Journal (article/letter/editorial) | | Tamazert, Morocco Fort Portal, Uganda Katwe-Kikorongo, Uganda Bunyaraguru, Uganda Tinderet, Kenya C...large volcanoes or SVEs. An exception is the Fort Portal occurrence which comprises numerous carbonatitic...mantle origin. The identification of some of the Fort Portal carbonatitic tuffs as ignimbrites (Barker and...appear to be unique to that volcano, whilst the Fort Portal lava and lava bombs are apparently also unique...unique their mineral assemblages including primary spurrite and periclase. 3. Associated silicate rocks Table |  | Galuskina, I. O., Lazic, B., Armbruster, T., Galuskin, E. V., Gazeev, V. M., Zadov, A. E., Pertsev, N. N., Jezak, L., Wrzalik, R., Gurbanov, A. G. (2009) Kumtyubeite Ca5(SiO4)2F2 — A new calcium mineral of the humite group from Northern Caucasus, Kabardino-Balkaria, Russia. American Mineralogist, 94 (10) 1361-1370 doi:10.2138/am.2009.3256 | Journal (article/letter/editorial) | | Northern Caucasus, Russia. The new mineral occurs in spurrite-rondorfite-ellestadite zones of skarn. The empirical...reinhardbraunsite were presented from carbonatites of Fort Portal, Uganda (Barker and Nixon 1989), but the low total...marble with banding relics. Massive dark gray spurrite-calcite rocks encase the marble core. Some small...kumtyubeite. More rarely, small fragments of light spurrite rocks, 50 cm in size, with striking pink spots...brucite are fairly common. Kumtyubeite is noted in spurrite-rondorfite-ellestadite zones of skarn, developed |  | | Report (chapter) | | represent the final residua expelled from the source region. Most large carbonatite intrusions seem to have...(Lengai) 2. Calcio-c (Kerimasi) 3. Calcio-c (Ft. Portal) 4. Calcio-c (Polino) 5. Calcio-c (Kaiserstuhl)...by 1961 the Recent carbonatite lava flow at Fort Portal had been described (von Knorring & Du Bois 1961)...tufts cemented by calcium carbonate. In the Fort Portal lava flow, olivine, diopside and phlogopite xenocrysts...of calcite, periclase, perovskite, apatite and spurrite, consistent Table 2. Effusive calcio- and magnesio-carbonatites |  | Neave, David A., Black, Martin, Riley, Teal R., Gibson, Sally A., Ferrier, Graham, Wall, Frances, Broom-Fendley, Sam (2016) On the Feasibility of Imaging Carbonatite-Hosted Rare Earth Element Deposits Using Remote Sensing. Economic Geology, 111 (3) 641-665 doi:10.2113/econgeo.111.3.641 | Journal (article/letter/editorial) | | Uyaynah in the United Arab Emirates, and Fort Portal in Uganda. Carbonatites from the following locations...Africa. Carbonatites from Tororo and Sukulu in Uganda, Chilwa Island and 643 Kangankunde in Malawi...carbonatite melt (Mariano, 1989). Mount Weld in Western Australia started processing ore in 2011 and is...(Simonetti and Bell, 1994). Tororo and Sukulu in Uganda lie within the same dominantly calciocarbonatitic... 1994). The REE-poor Fort Portal extrusive carbonatite, also located in Uganda, is described in detail |  | | Journal (article/letter/editorial) | | oalcinm carbonate, in a palagonite-tuff at Fort Portal, Uganda. Named in honour of H.R.H. Prince Luigi Amedeo...structure and orthorhombic symmetry. Occurs wlth spurrite (q. v.) in contact-metamorphic limestone at Velardefla...Spencer, 1907 ; 4th list) at Broken Hill, North-Western Rhodesia. Paramontmorillonite. A. Fersmann, 1908...3CaCO s . 2Cue. Brugnatellite, Mg6FeC02oI-I w Spurrite, 2CasSiO 4 . CaCO s. SULPHATES. Natrochalcite...Benitoite, BaTiSisO 9. Joaquinite, sil. & tit. Ca, Fe. Spurrite, 2Ca2SiO 4 . CaCOs. Hallerite, vat. of paragonite |  | Abersteiner, Adam, Kamenetsky, Vadim S., Graham Pearson, D., Kamenetsky, Maya, Goemann, Karsten, Ehrig, Kathy, Rodemann, Thomas (2018) Monticellite in group-I kimberlites: Implications for evolution of parental melts and post-emplacement CO2 degassing. Chemical Geology, 478. 76-88 doi:10.1016/j.chemgeo.2017.06.037 | Journal (article/letter/editorial) | | bodies (Tyni (1997)) and is located on south- D western margin of the Archean Karelian Craton in eastern...olivine in the Fort Portal carbonatite: Reaction 2: Forsterite + Calcite = Monticellite + Spurrite + Periclase...High-Ca, low-alkali carbonatite volcanism at Fort Portal, MA Uganda. Contrib. Mineral. Petrol. 103, 166 –...and Group II Kimberlites: Petrogenesis and Source Region Evolution. J. Petrol. 47, Berg, G.W., 1989. The...2008. The Majuagaa kimberlite dike, Maniitsoq region, western Greenland: Constraints on an Mg-rich silicocarbonatitic |  | | Book | | margin of the Atlantic (Namibia, Angola) or the western African kimberlites do not fulfil the above criteria...carbonatitic-alkaline province outcropping on the Kenya-Uganda border which have recently received significant...East-African Rift volcanism, both in its eastern and western branches. The abundance of available data varies;...LILE- enriched ultra-alkaline volcanism of the Western rift is also examined in the light of trace element...Africa .................................. 3.2 Western Africa ................................... 3.3 |  | | Journal (article/letter/editorial) | | kamafugites and carbonatites found in the same region. The igneous contact rock contains variable amounts...Sulf = sulphide bleb. (Lucania-Italy) and Fort Portal (Uganda) (Bailey et al., 2005), although the latter...Melilite from kamafugitic Alban Hills ejecta (Roman Region) has high gehlenite and low Na-melilite components...310 ppm Sr, which is unique of travertines in the region. In this case it seems that some Sr from magma...Eby, N., Woolley, A., 2005. Melilitite at Fort Portal, Uganda, another dimension to the carbonate volcanism |  | | Book (edition) | | all localities), Canada, Germany, Norway, Sweden, Uganda, Tanganyika, Nyasaland, and India. This, like most...Progress and B. C. King and D. S. Sutherland (1960B) : Uganda Geological Survey and B. C. King (1949) : The American...the major contributors have been the following. Uganda: K. A. Davies (1956), C. E. Williams (1952, 1959)...breakdown is: U.S.A., 13; Canada, Dyke Brazil, il}s Western Europe and Greenland, 11; U.S.S.R., 35 (?); Africa...and others (discordant) of the Sangu complex in western Tanganyika and the Kaluwe carbonatite (concordant) |  | | Book | | Tanzania - Oldoinyo Lengai Region - Congresses. ism - Tanzania - Oldoinyo Lengai Region - Congresses. 3. Oldoinyo...April 1915. Schulze also records a flow on the western slopes between 1800 and 2000 m. 5 1917 and 1926...extrusion of combeite nephelinite lava onto the upper western slopes of the volcano; its stratigraphic position...extent that the small cone on the inner north-western wall of the crater (point X on Fig. 10) is now...around 30-40 m below the lowest point on the north-western rim of the crater. (Photo N. Patridge) which by |  | | Book | | skarns in the Solvech fluorite deposit. Karagandin region. Kazakhstan, have a 12-87, c 14-97 A, and a composition...aluminous-serpentine, 20th List) from the Lake Superior region [M.A., 15, 411; 19, 268]. An unnecessary name for...for aluminian lizardite, from the Lake Superior region. Cf. Al-antigorite. 28th List Al-nontronite. H...thorianite group. Named from the locality, Aldan region, eastern Siberia (18th List). [M.A., 12, 460.]...Chiaro and other localities in the Taro valley region, Italy (.M.A., 8, 517; 15, 332) is now named for |  | | Book (edition) | | Transitions from Continental Arc to Rift Associations in Western North America . . . . . . . . . . . . . . . . ...Minerals . . . . . . . . . Dora Maira Massif in the Western Alps . . . . . . . . . . . . . . . . . Dabie–Sulu...Calvin Miller (Vanderbilt University), Raj Sharma (Western Michigan), Suki Smaglik (Metro State College of...always flows from a hotter region, where atomic motion is greater, to a cooler region, where motion is less...plates converge, as in the island arcs of the western Pacific. These petrotectonic associations are discussed |  | | Report (issue) | | 79(6) 1.93(8) 1.72(6) 117 BORACITE Fort Portal Tuffs, Uganda. JCPDS 13-0197. 2. 61(4) 1. 82(7) 1. 57(7)...0468. 2. 93 (10) 2. 80 (8) 2. 45 (5) 1. 57 (7) SPURRITE Durango, Mexico. JCPDS 13- 0496 . 3. 80 (6) 3 |  | | Book (edition) | | Unnecessary varietal name. (TL) L1ke Superior region. Alasanitc. error for alazanite. Znp. Vses. Min...thorianite with up to 1 2 wt.% PbO. (TL) Aidan region. eastern Siberi:i. US S R . Named for locality...[PDF 29-765 1. (TL) Alekseev deposit. Sutemskii region, St:inovoi range. USSR. Named for locality. Alexandrite...Roma, ser. 5, 17, sem . 2, p. 233. (TL) Fort Portal. Uganda. Named for Prince Luigi Amedeo of Savoy:...yellowish green chalcedony from (TL) Death Valley region. California. USA. Amberite. error for amhritc |
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