 | Stoppa, F., Woolley, A. R., Lloyd, F. E., Eby, N. (2000) Carbonatite lapilli-bearing tuff and a dolomite carbonatite bomb from Murumuli crater, Katwe volcanic field, Uganda. Mineralogical Magazine, 64 (4) 641-650 doi:10.1180/002646100549661 | Journal (article/letter/editorial) | | 641ā650 Carbonatite lapilli-bearing tuff and a dolomite carbonatite bomb from Murumuli crater, Katwe volcanic...volcanic field, Uganda F. STOPPA1,*, A. R. WOOLLEY2, F. E. LLOYD3 AND N. EBY4 1 Dipartimento di Scienze...the Murumuli crater, Katwe-Kikorongo volcanic field, SW Uganda which contain abundant carbonatite pelletal...clinopyroxenites considered to be of mantle origin. The carbonatite lapilli consist essentially of Sr-bearing calcite...altered prisms of melilite. A 7 cm long dolomite carbonatite bomb is described which displays a form typically |  | | Journal (article/letter/editorial) | | from the K-maĀ®c-carbonatite effusive magmatic association of Katwe-Kikorongo, SW Uganda F. E. Lloyd1;2...phlogopite-biotite is dominant in Ugandan kamafugite-carbonatite effusives and their entrained alkali clinopyroxenite...clinopyroxenite xenoliths and mica in Katwe-Kikorongo mixed melilitite-carbonatite tephra. Higher Al2O3 distinguishes...Portal carbonatite xenocrysts and some contain high Cr. It is suggested that the genesis of Katwe-Kikorongo...Katwe-Kikorongo olivine melilitite and Fort Portal carbonatite involves a 300 F. E. Lloyd et al. carbonate-bearing |  | | Journal (article/letter/editorial) | | composition and carbonateāsilicate equilibria in the volcanic rocks of kamafugitic affinity in the Toro-Ankole...from ugandite and mafurite of the Bunyaruguru volcanic field. The initial compositions of melt inclusions...1134/S0016702909090031 INTRODUCTION The origin of carbonatite magmas remains an unsolved problem. Carbonatites...melilitite of Vulture Volcano, South Italy [4]. Carbonatite globules identified in the tephriteāphonolite...associations in the differentiated varieties [5]. Carbonatite melts play an important role in the magmatism |  | 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 Ken...blanket of bflaggyQ tuffs, long regarded as carbonatite tuff with crustal debris. Fresh examination shows...low pressure carbonate melt crystallisation). Carbonatiteāmelilitite magma left the mantle carrying restite...the flaggy tuffs are uniform and explicable as carbonatiteāmelilitite plus a thoroughly mixed combination...ultramafic-carbonate volcanism to the south, in Uganda, and parallels with that in Italy. D 2005 Elsevier |  | | Journal (article/letter/editorial) | | and petrogenesis of the Fort Portal, Uganda, extrusive carbonatite G. Nelson Eby a,ā, Felicity E. Lloyd...Available online 25 July 2009 Keywords: Carbonatite Carbonatite tuffs Geochemistry Liquid immiscibility...Quaternary Fort Portal volcanic ļ¬eld occurs at the northern end of the Western Rift in Uganda. The eruptive phases...consist of (1) early carbonatite tuff cones followed by (2) a blanket carbonatite tuff (the major unit...of the ļ¬eld) and ļ¬nally (3) a small volume of carbonatite lava. Mantle and crustal xenoliths are found |  | | Journal (article/letter/editorial) | | Accepted Manuscript Xenoliths from Bunyaruguru volcanic field: some insights into lithology of East African...Muravyeva, V.G. Senin , Xenoliths from Bunyaruguru volcanic field: some insights into lithology of East African... ACCEPTED MANUSCRIPT Xenoliths from Bunyaruguru volcanic field: some insights into lithology of East African...xenoliths from kamafugites of the Bunyaruguru volcanic field has been determined. The major and some trace...Bunyaruguru PT is one of three (Katwe-Kikorongo, Fort Portal and Bunyaruguru) volcanic fields included in the |  | | Journal (article/letter/editorial) | | in the most abundant and best-known form of carbonatite, coarse-grained intrusions, it typically falls...composition range close to Fe3O4. A fine-grained carbonatite from Zambia contains magnetites with an extraordinary...are seen. Checks on similar rocks from Germany, Uganda and Tanzania reveal magnetites with comparable...from alkaline and alkaline ultramafic silicate volcanic rocks cover only parts of this array. Magnetite...fall in the same composition field, suggesting that this form of carbonatite may be distinctive. The chemistry |  | Rosenthal, A., Foley, S.F., Pearson, D.G., Nowell, G.M., Tappe, S. (2009) Petrogenesis of strongly alkaline primitive volcanic rocks at the propagating tip of the western branch of the East African Rift. Earth and Planetary Science Letters, 284 (1) 236-248 doi:10.1016/j.epsl.2009.04.036 | Journal (article/letter/editorial) | | strongly alkaline primitive volcanic rocks at the propagating tip of the western branch of the East African...characteristic of the Toro-Ankole volcanic ļ¬eld in southwestern Uganda, forming the youngest and most northward...northward volcanics of the western branch of the East African Rift. Lavas contain exceptionally low SiO2...Particularly in low magma volume rifts such as the western branch of the East African Rift, silicaundersaturated...a continental rift: it consists of eastern and western branches that have contrasting alkaline chemistry |  | | Journal (article/letter/editorial) | | Kavirondo rift in Kenya, contains blocks of carbonatite lavas with calcite, minor apatite, ļ¬uorite, spinel-group...least four types of calcite are present in the carbonatite lavas; they differ in morphology, composition...and jacobsite. Oxygen isotope data for bulk carbonatite samples (d18O = +16.2% to +22.6% VSMOW) support...which contained primary nyerereite. K EY WORDS : carbonatite, natrocarbonatite, calcite, ļ¬uorite, jacobsite... 1972; King et al., 1972; Woolley, 2001). The volcanic rocks from Tinderet range from 19.9 to 5.5 Ma |  | | Journal (article/letter/editorial) | | elsevier.com/locate/lithos Geochemistry of carbonatiteāsilicate pairs in nature: A case history from...(Aquila-Abruzzo, Italy) carbonatite is associated with phonolitic foidite tuff. The Oricola carbonatite contains fresh...kamafugite and Polino Ca-carbonatite, or Grotta del Gervo kamafugite and Oricola Ca-carbonatite, we note couple...Elsevier B.V. All rights reserved. Keywords: Carbonatite; Kamafugite; Immiscibility; LA-ICP-MS; Italy...petrogenesis of carbonatites is whether they travel as carbonatite magmas direct from the man- F. Stoppa et al |
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