 | | 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)...magnetite, plus some phlogopite, titanite, K-feldspar, fenite and glimmerite; ijolite lithics are rare. Thus...relationship with the nephelinites of the Kisingiri volcano. Two hypotheses are discussed. A rising silicate...alternative is that the silicate component is remobilized fenite, formed from country rock that was mobilized by |  | | Report (chapter) | | contact-reaction rock. The feldspar-rich syenitic fenite aureoles which develop around the early carbonatites.../ 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 |  | | 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 |  | | Journal (article/letter/editorial) | | whole rock isochrons for the Monchique and Mt. Kenya complexes, together with a series of 87Sr/86Sr ratios...claimed as a reasonable representation of the volcano. Rocks have been chosen from the remaining complexes...lineage is represented in the present study by Mts. Kenya and Kilimanjaro, the "carbonatitic" lineage by Mt...the dissected complexes of Kisingiri (Rangwa), Jombo Hill, Ruri and Homa Mtn. Mt. Meru, like Moroto in...Choice of Samples The samples from Monchique, Mt. Kenya and Jombo Hill include examples of all major rock-types |  | | 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...carbonatitic rocks from two complexes in western Kenya. It complements field mapping and petrographic study...study of a number of complexes in western Kenya and eastern Uganda by other members of the East African |  | | 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 |  | | 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...Brogger’s term Sovite Rauhaugite Kasenite Hollaite Fenite Tveitasite Nearly pure calcitic carbonate, max...nomenclature Generalnames Alvikite Beforsite Sovite-fenite or sOvite-tveitasite hybrids. 100-90% Calcite...Silicocarbonatite Rocks Silicates 90-100% Ljolitemelteigite Fenite = Sdvitic or calcitic ijolite ljolite Carbonatitic |  | | 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...on the peralkaline silicic central volcanoes of Kenya and also favours an origin by crystal fractionation...extensive zones of metasomatised country rock (fenite) around alkaline plutons, the abundance of chlorine...pyroclastic deposits around central volcanoes in Kenya often show striking variations in the abundance |  | | Report (issue) | | Phosphorite General Age Mineralization Batemans Bay Marine chemical sediment nodular Ordovician New...Cretaceous 76 Australia Northern Territory Fannie Bay Marine chemical sediment nodular 78 Australia...pelecypods Late Miocene 121 Australia Victoria Waratah Bay Marine chemical sediment nodular 122 Australia...207 Canada Burritt Island 208 Canada Callender Bay 209 Canada Clay-Howells 210 Canada Crevier Secondary...Nonmarine sedimentary 223 Canada Ontario Argor (James Bay) Magmatic, carbonatite/alkalic 224 Canada Ontario |  | | 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...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...chambers beneath the lower east rift zone of this volcano, and they are repeatedly filled with magma that |  | | Book | | 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...northeast-trending joints and shear zones. Senga Bay, Salima Granites with syenitic phases crop out sporadically |  | | 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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