 | | Journal (article/letter/editorial) | | extrusive carbonatites at Rangwa Caldera Complex, Kenya G. ROSATELLI1,*,{, F. WALL2 AND M. J. LE BAS3...of the large Kisingiri nephelinite-carbonatite volcano, Homa Bay District, western Kenya (0º34’S; 34º09’E)...relationship with the nephelinites of the Kisingiri volcano. Two hypotheses are discussed. A rising silicate...after crystallization of calcite, phlogopite, apatite and magnetite. Preservation of the the potassic...EY WORDS : carbonatite, Rangwa Caldera Complex, Kenya, nephelinite. Introduction TO date, extrusive rocks |  | | Report (issue) | | Report No. 45 COLONY AND PROTECTORATE OF KENYA MINISTRY OF COMMERCE Ä N D INDUSTRY GEOLOGICAL SURVEY...of South Nyanza, in the south-western corner of Kenya. It is a most important area as in its northern...centre at Rangwa became the focus of a central volcano, much of which is still preserved and when traced...(2) The Kisingiri Volcano (a) The Updoming of the "Sub-Miocene" Peneplain surface under Kisingiri (b) The...The Kisingiri Volcanic Series (i) The Lower Kisingiri Nephelinite Lavas (ii) The Middle Kisingiri Pyroclastic |  | | Report (chapter) | | / K i ;1:/\. - u3-'~."\ -r ~ \\ -/:/ ", KENYA u __-/~.'\- " :. / I 2 ~ i TANZANIA 9 ~ ...4- • LODWAR ~t~ MOROTO z --2 0 NAPAK ~ KENYA C e n o z o i c l a v a s and pyroclastic deposits...+ NYAMBENI I&UISHU ~ Kavirondo ~ M T . ~ A KENYA Olivine-poor volcanic A Olivine-rich volcanic ...TANZANIA 134~ ~ HANANG ~ 1380 FIG. 3. Map of Kenya and adjacent areas showing the present distribution...inner- and outer-zone magmas. Kenya rift valley (his Plateau and Kenya types). The latter are derived |  | | Journal (article/letter/editorial) | | morphology from volcanic carbonatites in Tanzania, Kenya, Greenland, and India T. DEANS 2o Grove Park Road...identifications of similar magnetites from four localities in Kenya, one in Greenland, and one in India. Despite the...also spelled Galappo) lies at the foot of the volcano Kwaraa (also Kwaraha, or Ufiome), one of several...TINOIERET 3~ o / 0~ eNakuru 3t. L.NaivashaQ Kenya "~"-..~ l_.Mag,~li~ Tanzania L.Natron /2";OLDOINYO...nephelinite/carbonatite volcanoes (underlined) in Tanzania and Kenya. The carbonatites occur at the south-eastern foot |  | | Journal (article/letter/editorial) | | related ro&s from carbonatitecomplexes, south Nyanza, Kenya CHRISTOPHER BARBER LITHOS Barber, C. 1974: The...rocks from two carbonatite complexes, south Nyanza, Kenya. Lithos 7, 53--63. Carbonatites, metasomatised country...analysed from two earbonatite complexes, Homa and Wasaki, W. Kenya. The carbonafites are all greatly Ca-earth...the common carbonatitic minerals (e.g. calcite, apatite and magnetite) or more rarely form rare-element...carbonatitic rocks from two complexes in western Kenya. It complements field mapping and petrographic study |  | | Journal (article/letter/editorial) | | Rangwa and Ruri Carbonatite Complexes in Western Kenya By G. J. H. MCCALL (PLATES XII-XIII) ABSTRACT ...cauldron subsidence is involved in some of the Kenya complexes is considered. rocks, containing melilite...principal constituent, were first described from Kenya by Pulfrey (1953), who mapped a small dyke at the...the south-west foot of the Tinderet nephelinite volcano (McCall, 1956). Further occurrences of alnoitic...islands, as well as some of the volcanic rocks of Kisingiri, are sparsely distributed and include alnoitic |  | | Journal (article/letter/editorial) | | 12 – 9 Ma) is poorly represented in the Southern Kenya Rift, though magmatic activity is recorded in the...– 4 Ma) is particularly well-represented in the Kenya Rift. Large-scale magmatic events include: commencement...Divergence (NTD) and Mt. Kenya, Rungwe Volcanic Province, and the Southern Kenya Rift. The Stratoid Phase...magmatic events at ca. 3 to 2.5 Ma within the Southern Kenya Rift and NTD. This phase manifests as basalts and...that flood the newly formed graben in the Southern Kenya Rift. This phase also correlates with the main phase |  | | Journal (article/letter/editorial) | | Geology, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada ABSTRACT Carbonatites are...calcite carbonatite, magnetite apatite dolomite carbonatite, and magnetite apatite olivine calcite carbonatite...a modal range from 100 vol.% magnetite through apatite calcite carbonatite to 100 vol.% olivine. Within...(dunite), but together they constitute a magnetite – apatite – olivine carbonatite. Such gross modal variations...(Sweden), Tororo and Napak (Uganda), and Shombole (Kenya). Notably absent are large volumes of melilite-bearing |  | | Book (edition) | | field work on the Iron Hill complex of Gunnison County, Colorado, in 1912-1913. Although his final results...1955), L. J. Fick and C. van der Heyde (1959). Kenya: B. H. Baker (1953), G. L. Coetzee and C...biotite sOvite (biotite, 10 to 40 per cent), apatite sdvite (apatite, 10 to 30 per cent), see Table 1-2. The...rocks: Ravalli County, Montana, and Verity, British Columbia. Similar are those of Salmon Bay, Alaska, and...Sphene, ilmenite, rutile, Ti-magnetite, zircon, apatite, pyrochlore Volatile elements: F, Cl, H,O H |  | | Report (volume) | | 273 BAKER, B. H. Outline of the petroIogy of the Kenya rift alkaline province 293 MACDONALD,R. Quaternary...peralkaline silicic rocks and caldera volcanoes of Kenya 313 WOOLLEY, A. R. & JONES, G. C. The petrochemistry...by their association with economic deposits of apatite (Kogarko) and with diamonds (Dawson; Bergman)...on the peralkaline silicic central volcanoes of Kenya and also favours an origin by crystal fractionation...pyroclastic deposits around central volcanoes in Kenya often show striking variations in the abundance |  | Riley, T. R., Bailey, D. K., Harmer, R. E., Liebsch, H., Lloyd, F. E., Palmer, M. R. (1999) Isotopic and geochemical investigation of a carbonatite-syenite-phonolite
diatreme, West Eifel (Germany) Mineralogical Magazine, 63 (5) 615-631 doi:10.1180/002646199548736 | Journal (article/letter/editorial) | | was emplaced adjacent to an alkali-mafic maar volcano and a nephelinitic stratacone. The diatreme erupted...of calcite, biotite, clinopyroxene, amphibole, apatite, titanite, pyrochlore and magnetite. Several syenites...melilite, clinopyroxene, vishnevite, melanite, apatite, sanidine and magnetite. The whole rock analyses...Blenkinsop (1989), where nephelinites from Kisingiri volcano also plot on the EACL (Fig. 5). Bell and Peterson...of nephelinites and carbonatites from Shombole volcano, which also revealed a common signature, and further |  | | Book | | derived from vol- cani vicus, or the seat of a volcano. Desmarest (1771) also worked in the Auvergne and...chamber that lies 3 km beneath the caldera of Krafla volcano (Einarsson 1978: 187). been cycle, This studied...accessory phases such as phlogopite, richterite and apatite. According to Yoder (1976: 205) the melting behaviour...approximately 40 to 10 km beneath the summit of Kilauea Volcano, between 10 and Hawaii, 3 km and that at depths... or into dykes that feed the rift zone of the volcano. According to Moore (1983: 139) there are several |  | | Report (issue) | | Company, 514 p. Born, H., 1989a, The Jacupiranga apatite deposit, Sao Paulo, Brazil, in Notholt, A.J.G....Hasan, M.T., and Asrarullah, 1989, Phosphate (apatite) resources in the Loe Shilman Carbonatite, Khyber...Society, London, p. 55142. Ilyin, A.V., 1989a, Apatite deposits in the Khibiny and Kovdor alkaline igneous...Industrial Minerals, 2000, Apatit to exploit new apatite deposit: no. 399, p. 26. Instituto Ecuatoriano...Coupled changes of oxygen isotopes in PO4 and CO3 in apatite, with emphasis on the Monterey Formation, California | | | Report (issue) | | muscovite molybdenite guano pyrochlore, columbite apatite, fluorapatite monazite, bastnäsite quartz strontianite...Company, 514 p. Born, H., 1989a, The Jacupiranga apatite deposit, Sao Paulo, Brazil, in Notholt, A.J.G....Hasan, M.T., and Asrarullah, 1989, Phosphate (apatite) resources in the Loe Shilman Carbonatite, Khyber...Industrial Minerals, 2000, Apatit to exploit new apatite deposit: no. 399, p. 26. Industrial Minerals, 2000b...Coupled changes of oxygen isotopes in PO4 and CO3 in apatite, with emphasis on the Monterey Formation, California |  | | Book | | A, No. 2, 61. 1938 (with Harvey, C. O.). An apatite rock from Dumfriesshire, Great Britain. Summ. Progr...northern portion in northern Tanzania, western Kenya, and eastern Uganda where the Nyanzian System, composed...through Rhodesia, Mozambique, Malawi, Tanzania and Kenya, and is characterised by ages of 400-700 m.y. (Cahen...rejuvenated antique sequences: the Nyanzian of Kenya (Sanders, 1965); the Bulawayan of Rhodesia (Johnson...and the Mozambique Belt in western Kenya. Bull. geol. Surv. Kenya, 7. ScureIner, G. D. L., and VAN NIgkERK |  | | Book (volume) | | include iron ores, mica, siderite, zircon, and apatite). Sandstone may also contain sand-sized grains...Radenhein (Austria), Liaotung (China), and Clark County, Nevada (USA). Evaporites The evaporite chemical...carbonate sediment. Trenton Series, Ordovician, Centre County, Pennsylvania, USA. (C) Silicified bioclastic sandstone...of greenish mud from a depth of 1920 m in Baffin Bay, offshore Canada, using a deep-sea grab, representing...authigenic minerals, such as chert, zeolites, apatite, phosphorite, volcanic glass, and manganese micronodules |  | | Book (volume) | | pegmatite areas include the Pala area of San Diego County in California, the Nuristan area of Afghanistan...marble formed by the metamorphism of limestone. Kenya rubies (Mangari area of the Tsavo West National...provide evidence for the 1628 bc eruption of the volcano on Santorini (Thera) which is thought by some archaeologists...climate GEOARCHAEOLOGY 17 Figure 2 Sedgefield, County Durham. Fluxgate gradiometer data. 1 0.5 m. Romano...of these surveys, especially the 1802 survey of County Kilkenny by William Tighe (1766–1816), contain |
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