 | | Journal (article/letter/editorial) | | of some new xenolithic alkaline rocks from East Africa N. M. S. R O C K with chemical analysis by J. H...occur in the carbonate-rich tufts and lavas of Mount Elgon; kaersutite-rich pyroxenites and a suite of fenitized...fenitized basement rocks in the caldera flows of Mount Meru, and apparently unique melanocratic hortonolite...nepheline syenites in the central foyaite plug of Mount Kenya. The sTSr/a6Sr ratios indicate mantle origin...elements such as St, Nb, and Zr. The xenoliths from Mount Kenya are cumulate equivalents of the glassy kenyte |  | | Report (issue) | | works at Sukulu; the south-eastern slope of Mount Elgon is seen in the background. THE GEOLOGY OF PART...51 52 Petrography .. Vl INDEX-coutiuued. The Elgon Series Bugislzu Series Agglomerates and Lavas 53...Outcrops are usually poor in the areas away from the Elgon cliff and information has been gained in this region...to the west and the foothills and main cliff of Elgon to the east. The resultant variation in height,...the vertical cliffs formed by the agglomerates of Elgon which in many places are up to 1,000 feet in height |  | | Journal (article/letter/editorial) | | African Rift System. Insert map shows parts of East Africa, with the location of the two rift branches, and...undertaken on nephelinite lavas from Napak and Mount Elgon volcanoes, eastern Uganda-western Kenya (Simonetti...Ugandite Olivine, clinopyroxene, phlogopite, leucite, ilmenite Ti-rich magnetite Nepheline– Clinopyroxene, leucite...phlogopite, nepheline, kalsilite Perovskite, apatite, ilmenite, nepheline, kalsilite Perovskite, apatite, glass...leucite; smaller amounts of nepheline, kalsilite, ilmenite, 264 N.S. Muravyeva et al. / Lithos 210–211 |  | | Journal (article/letter/editorial) | | in most of the countries up the eastern side of Africa from the Union to Egypt, though they are most prominent...probably the latest of the major alkaline centres, Elgon, ceased to erupt in the Pliocene. The state of erosion...fashion to the needles seen in the breakdown of ilmenite to leucoxene. An analysis of the dyke rock by...Diopside Hypersthene Magnetite Calcite . Apatite . Ilmenite Pyrites . Water . Norm 5-34 23-91 17-82 21-96...Dolerites, associated with the Karroo System, S. Africa. Geol. Mag., lxvii, 1930, 101. (3) WALKER, F., |  | | Journal (article/letter/editorial) | | intrusive ijolitecarbonatite centres around Mount Elgon (Fig. 1), forms a notably undersaturated alkaline...18-5 370 — 61 • Titanite made in preference to ilmenite. 1. Olivine melancphehnite (V70): flow. 2. Olivine...Merwin (1922) have described another example from Mount Kilimanjaro. The analyses of these amphiboles, when...that it is clear from many lines of evidence that Elgon carried a high water content and estimated that...major associations shown by the volcanoes of east Africa: the basalt-phonolite- R. VARNE—PETROLOGY OF |  | | Journal (article/letter/editorial) | | from Napak Volcano, eastern Uganda [7], and Mount Elgon Volcano, eastern Uganda–western Kenya [8]. This...the rock comprises also kalsilite, nepheline, ilmenite, phillipsite, and, sometimes, carbonates. The...Bell, “Nd, Pb and Sr Isotopic Data from the Mount Elgon Volcano, Eastern Uganda–West ern Kenya: Implications |  | | Journal (article/letter/editorial) | | granites appear beneath an outlier of volcanics of the Elgon series. Arcuate shear structures occur and the fenites...but since it has been revealed from beneath the Elgon volcanics by the active downcutting of the Siroko...sphene, and apatite are widespread, magnetite-ilmenite, perovskite and biotite occur in some rocks, while...nearly colourless diopside, together with magnetite-ilmenite, perovskite, apatite, and a very pale sphene....coloured and more aegirine-rich while magnetite-ilmenite and perovskite are replaced by melanite and a |  | | Report (chapter) | | largely through the impact of work in Scandinavia and Africa. Br6gger's work (1921), at Fen in S Norway, which...(1935) were the first to identify carbonatites in Africa. Garson re-investigated the Malawi complexes of...carbon- atitic complexes of different ages in E Africa and reveals that, while the high-field-strength...elements. The younger complexes of Homa Mountain and Elgon both show a slight enrichment in Ba and Th, and...nephelinitic lavas from carbonatitic and other provinces Elgon, WKenya Kisingiri, W Kenya Napak, EUganda RR659 |  | | Journal (article/letter/editorial) | | Ca-Fe-Ti-Zr-garnets, soda-melilite, monticellite, Mg-Mn-ilmenite, perovskite, serpentine, Fe-Mg-Ti-Mn-Cr-Al-spinels±glass...Feldspathoids, mdilite Diamond, graphite, native metaJi Ilmenite (Table 8) Garnet (Table 7) Amphibole (Table 7)...and nephelinites, and lack the perovskite, Mg-ilmenite, eckermannite and melilite of UML, which are nearer...California, San Francisco on December 13, 2014 Africa (18) Ml. Elgon. Kenya/Uganda (19) Homa Bay a n a , Kenya...Alnotte, aillilcile Alnotle, aillilulc Parts of Elgon nephdinitc volcano Parts of Rangwa/Homa carbonatite |  | | Report (issue) | | itself as a mass of size comparable with that of Mt. Elgon. A branch of the Kavirondo Gulf rift valley runs...dissected volcano, of even larger areal extent than Mount Elgon. The slopes are steep, traversed by numerous...produced by the Aircraft Operating Company of South Africa for Kenya Consolidated Goldfields Limited (1937-1939)...can be found in volume 8 of "Fossil Mammals of Africa" (Hopwood and Hollyfield, 1954). HI.—PHYSIOGRAPHY...present in the great nephelinite volcano of Mount Elgon and should be considered as a possible origin |  | | Journal (article/letter/editorial) | | crystallization of the commoner minerals is, magnetite and ilmenite, biotite, augite and olivine, labradorite and...than those of Birunga and were extruded near Mount Elgon from several centres, and these rocks also have |  | | Report (volume) | | cave salts and utilization by elephants in the Mount Elgon Region, Kenya 63 Seiinus, O. FRANK, A. & GALGAN... or non-filarial elephantiasis, in tropical Africa The editors are particularly grateful to JAGID...This is particularly the case in shield” areas of Africa and Latin America where soils have developed on...million years (since the Jurassic) in parts of Africa, America and Asia Michel 1973), are common....and representative mines in southeast southern Africa, have highlighted health numerous Asia and systematic |  | | Journal (article/letter/editorial) | | minor amounts of anhedral amphibole, magnetite and ilmenite. The mafic shells are comprised of very small,...crystals of plagioclase, orthopyroxene, magnetite, ilmenite, amphibole and minor biotite. Orbicule shells...feldspars where the pink colouring is caused by ilmenite inclusions; the Fisher Lake feldspars are neither...(and TiO2) to increasing amounts of magnetite and ilmenite produced by mechanisms such as increasing oxygen...(1957) Petrology of Quaternary volcanics of the Mount Garibaldi map-area, southwestern British Columbia |  | Ngounouno, I., D�ruelle, B., Montigny, R., Demaiffe, D. (2005) Petrology and geochemistry of monchiquites from Tchircotch� (Garoua rift, north Cameroon, Central Africa) Mineralogy and Petrology, 83 (3) 167-190 doi:10.1007/s00710-004-0068-y | Journal (article/letter/editorial) | | Tchircotché (Garoua rift, north Cameroon, Central Africa) I. Ngounouno1 , B. Déruelle2 , R. Montigny3,...Mid-African Rift System, which propagates far inside Africa (Kampunzu and Popoff, 1991; Guiraud and Bosworth...kV, 10 nA, 10 s by element) – Ti-magnetite and ilmenite (iron recalculated after Stormer, 1983; 20 kV...Ngounouno et al., 2001); d Location of Fig. 1a in Africa (cratons, after Kampunzu and Popoff, 1991) Petrology...subhedral phenocrysts (3 to 5 mm). In samples 2 and 3, ilmenite lamellae are associated with titanomagnetite phenocrysts |  | | Book (edition) | | Venezuela, Brazil, Paraguay, Angola and South-West Africa, i.a. Carbonatites are now the major sources of...Canada Brazil Greenland, Europe, and the U.S.S.R. Africa India APPENDICES REFERENCES LOCALITY INDEX SUBJECT...of South Africa and C. A. Strauss and F. C. Truter (1950A) : Geological Society of South Africa and R....Society of South Africa and R. L. Johnson (1961) 6-12: Geological Society of South Africa and R. L. Johnson...Figure Figure 10-1: Geological Society of South Africa and S.J. Shand (1921A) 10-5: American Journal of |  | Milani, Lorenzo, Bolhar, Robert, Frei, Dirk, Harlov, Daniel E., Samuel, Vinod O. (2017) Light rare earth element systematics as a tool for investigating the petrogenesis of phoscorite-carbonatite associations, as exemplified by the Phalaborwa Complex, South Africa. Mineralium Deposita, 52 (8) 1105-1125 doi:10.1007/s00126-016-0708-2 | Journal (article/letter/editorial) | | as exemplified by the Phalaborwa Complex, South Africa Lorenzo Milani 1 & Robert Bolhar 1 & Dirk Frei...Witwatersrand, PVT Bag 3, Wits, Johannesburg 2050, South Africa 2 Department of Earth Sciences, University of...Western Cape, PVT Bag X17, Bellville 7530, South Africa 3 Department of Earth Sciences, Stellenbosch...Stellenbosch University, PVT Bag X1, Matieland 7602, South Africa 4 GeoForschungsZentrum Potsdam Telegrafenberg...Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa 6 Centre for Earth Sciences, Indian Institute |  | | Book | | MINERALS& GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published...Nature ( an imprint of Penguin Random House South Africa (Pty) Ltd) Company Reg. No. 1953/000441 /07 The...Century City, 7441 PO Box 1144, Cape Town, 8000 South Africa Visit www.penguinrandomhouse.co.za and join the...South Africa (Pty) Ltd Copyright© in published edition, 2019: Penguin Random House South Africa (Pty)...Introduction 8 Minerals and gemstones 9 Geology of East Africa 10 East African resources 12 Burundi 13 Kenya |  | Koornneef, Janne M., Davies, Gareth R., Döpp, Sonja P., Vukmanovic, Zoja, Nikogosian, Igor K., Mason, Paul R.D. (2009) Nature and timing of multiple metasomatic events in the sub-cratonic lithosphere beneath Labait, Tanzania. Lithos, 112. 896-912 doi:10.1016/j.lithos.2009.04.039 | Journal (article/letter/editorial) | | 112S (2009) 896–912 Fig. 1. Map of East Central Africa showing Rift valleys, the craton and the surrounding...melt pockets containing ‘exotic’ phases such as ilmenite, rutile, apatite, calcite, Cr-diopside, Fe–Ni...Melt pockets contain accessory phases such as ilmenite, amphibole, rutile, apatite, zircon and zeolite...are in contact with glass. Spinel, cpx, phl and ilmenite occur in the glass along grain boundaries and...polymict xenoliths from Bultfontein, Kaapvaal, South Africa (Lawless et al., 1979; Zhang et al., 2001; Höfer |  | | Book | | Mozambique Republic of South Africa Sao Tomé and Principe Somali Republic South-West Africa United Arab Republic...are crucial as transportation costs can quickly mount up to a prohibitive level. Although some dark-coloured...Haematite Fe,O, Pyrites FeS, Sphene(Titanite) CaTiSiO, Ilmenite FeTiO, Zircon Zr,SiO, Eudialyte (Eucolite) (Na...strongly suggestive of emplacement by intrusion. In Africa,2 where many carbonatite complexes have been discovered...discovery of an active carbonatite volcano* in Africa has demonstrated that carbonatite magmas do exist |  | | Journal (issue) | | AND KIMBERLITES Kimberlitic Volcanoes in East Africa. By Peter H. Nixon, BSc, PhD, MIMM, formerly Geological...and section . . . Kimberlitic Volcanoes in East Africa Fig. I Fig. 2 Fig. 3 Locality Map. Main faults...ment, with special reference to East and Central Africa. The guests and delegates were to be invited from...one regional meeting for geologists in eastern Africa had been held since 1959. The Conference was attended...geophysical approach was applicable to equatorial Africa, and concluded that Canadian methods would have |  | | Journal (issue) | | MOLYBDENITE TANTALITE AMBL YGONITE COLUMBITE RUTILE ILMENITE BERYL ZIRCON AND OTHER 'MINERALS BUYERS OF...INVESTIGATED IN OUR LABORATORY KNHPP E B.RTESLIMITED AFRICA HOUSE, KINGSWAY, LONDON, W.C.2 Telephone : CHA...-Uganda . • • • • • • • 191 BOOK REVIEWS Africa. A Study in Tropical Development. By L. D. Stamp...141 143 146 ABSTRACT ECONOMIC DEVELOPMENT IN AFRICA, AUSTRALIA AND IN MANY OTHER PAR'I'S OF...summer in some communities (U.S.G.S. 1950). In South Africa, the developments of agriculture, forestry, and |  | | Journal (article/letter/editorial) | | crystallization of the commoner minerals is, magnetite and ilmenite, biotite, augite and olivine, labradorite and...than those of Birunga and were extruded near Mount Elgon from several centres, and these rocks also have |  | | Book (volume) | | IRON-ORE SUPPLIES OF THE WORLD). PART 2.-BRITISH AFRICA. LONDON: PRINTED & PUBLISHED BY HJS MAJES'l'Y'S...South Africa : Transvaal Cape Province ... ... PAGE 5 • 6 Natal 23 23 South-West Africa Territory...38 Swaziland ... 47 British East and Central Africa :Kenya Uganda Tanganyika Nyasaland ... Egypt and... Introduction. Iron ore is known to occur extensively in Africa, but up to the present a considerable part of the...The chief deposits in British Africa are in the Union of South Africa, while Northern and Southern Rhodesia |  | | Journal (issue) | | Far East and Australasia, The ~Iiddle East and Africa-each country is covered in a separate contril)ution...MOLYBDENITE TANTALITE AMBL YGONITE COLUMBITE RUTILE ILMENITE AND BERYL OTHER ZIRCON MINERALS BUYERS OF...Fig. I Sketch Map showing Great Lakes of East Africa 216 '' • 217 '' page 214 GeophysicalProspectingfor...conditions of this considerable part of eastern Africa are dependent, at least in part, upon the effects...period showed a somewhat F10. 1.-GREAT LAKES OF EAST AFRICA closer correlation. In 1933 Gillman extended the |  | | Journal (article/letter/editorial) | | Journal Pre-proof The Cenozoic magmatism of East Africa: Part III – Rifting of the craton Tyrone O. Rooney...as: T.O. Rooney, The Cenozoic magmatism of East Africa: Part III – Rifting of the craton, LITHOS(2020)... Journal Pre-proof The Cenozoic Magmatism of East Africa: Part III – Rifting of the Craton Tyrone O. Rooney...Introduction na Keywords: Rift, magmatism, East Africa, Kenya, Tanzania, Craton, Ethiopia, East African...craton lP during the evolution of rifting in East Africa has resulted in lava compositions in the regions |
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