 | | 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...the KatweKikorongo volcanic field 75 km SW of Fort Portal. The groundmass of fresh carbonatite lava consists...filled with calcite, followed by jennite and thaumasite. Pyroclastic deposits cover 142 km z and are...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) | | known in the East African rift system in Kenya, Uganda, and Tanzania. Although some of these were studied...diatremes in the Fort Portal area; the Kavirondo ridge; and the Natron-Engaruka region. The rock samples...Carbonatites, ijolites, nephelinites, and phonolites Western rift: kivites, leucitites, and melanephelinites...province Na and Ca carbonates; soda, nahcolite, and thaumasite in cavities " " " Calcite and dolomite with...April 2015 Oldoinyo-L'Engai and Nyamlagira Fort Portal and Bunyaguru Kerimasi Kwaraha, Meru, and Hanang |  | | 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 |  | 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...well as occasional SC RI secondary fibrous thaumasite and phosphates such as rhabdophane or crandallite |  | | Journal (article/letter/editorial) | | outcrop occurs about 7 km to the east Spoleto, Umbria region, and covers an area of 10,000 m2, including a large...Panina et al. Fig. 1 а the geological map of Umbria region (central Italy) showing main geological and geographical...hydrothermal minerals: tobermoriteafwillite-jennite plus thaumasite, strätlingite and several different species of...low Na2O, and MgO MgO Italian Kamagugitic Fort Portal lavas carbonatite Al2O3 Gh 15 Gh Na-mel 1...Al2O3 MgO MgO Italian Kamagugitic lavas FeO Fort Portal carbonatite Al2O3 Na2O Vulture lavas Vulture |  | | Journal (article/letter/editorial) | | notably the occurrences from Ugandan kamafugites, Western Australian lamproites and South African orangeites...similar to that reported for Ugandan kamafugites and Western Australian lamproites and overlaps the values for...and LREE in sedimentary limestones from the ULUD region fail to account for a hypothetical limestone assimilation...petrological aspects with the more abundant Roman Region leucite* E-mail: castorina@uniroma1.it # 2000...related tectonics. (1) volcanic rocks; (2) Roman Region volcanics; (3) ULUD occurrences; (4) Plio-Pleistocene |  | Atencio, D., Andrade, M. B., Christy, A. G., Giere, R., Kartashov, P. M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48 (3) 673-698 doi:10.3749/canmin.48.3.673 | Journal (article/letter/editorial) | | is stable at low pressure and temperature in thaumasite, Ca3[Si(OH)6][SO4][CO3]•12H2O (Edge & 681 Taylor...& Taylor, H.F.W. (1971): Crystal structure of thaumasite, [Ca3Si(OH)6•12H2O](SO4)(CO3). Acta Crystallographica...emerald-bearing pegmatites of the Vigezzo Valley, Western Alps, Italy. Canadian Mineralogist 46, 619-633...1712-1722. Buregtey rare metal (Zr, Nb, REE) deposit, western Mongolia. Economic Geology 90, 530-547. Hogarth...and uranpyrochlore from tuff near Ndale, Fort Portal area, Uganda. Mineralogical Magazine 53, 257-262. Hogarth |  | | Journal (article/letter/editorial) | | kamafugites and carbonatites found in the same region. The igneous contact rock contains variable amounts...sulphates (opal, ettringite, jennite, strätlingite, thaumasite, tobermorite), and various zeolites (chabazite...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 |  | | 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 |  | | 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) | | 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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