 | | Journal (article/letter/editorial) | | situated, 12 km apart, on the western flank of the Kenya Rift Valley (McCall, 1964; Jennings, 1971; Jones...progressively more porphyritic. They overlie the Saos Mugearite, a series of alkali basalts, hawaiites, and mugearites...I/ Tanzania ) .Nair0bi FIG. 1. Index map of Kenya, showing location of Kilombe, K, and Londiani, L...(Sceal and Weaver, 1971), Menengai (McCall, 1967), Silali (McCall and Hornung, 1972), Ribkwo and Nasaken...minerals (Baker, 1978). Six specimens of Saos Mugearite, nine of K i l o m b e Trachyte, and nineteen |  | | Report (chapter) | | and sedimentation in the Kenya Rift from the equator northwards to Lake Turkana L.A.J. Williams & G.R.... Chapman SUMMARY: At the equator, the Kenya (Gregory) Rift Valley is a half-graben, faulted on the eastern...graben sector of the rift. The northern part of the Kenya Rift offers more rewarding areas for study of Tertiary...NNEtrending Kenya Rift Valley is about 100 km across--much wider than in southern Kenya. Lying E of the...m at the equator to less than 300 m near Lake Turkana. Some major structures swing to a N W - S E alignment |  | | Report (issue) | | activity and geology of the northern sector of the Kenya Rift Valley British Geological Survey Research...activity and geology of the northern sector of the Kenya Rift Valley P N Dunkley, M Smith, D J Allen and...activity and geology of the northern sector of the Kenya Rift Valley P N Dunkley, M Smith, D J Allen and...springs along its western shores. Geographic index Kenya Suf>jecr index Geothermal exploration, geology...activity and geology of the northern sector of the Kenya Rift Valley. British Geological Survey Research |  | | Journal (article/letter/editorial) | | a c t Young (b 1 Ma) volcanic complexes in the Kenya Rift Valley are used to outline recent progress...dome complexes, e.g. the Olkaria complex in the Kenya (Gregory) rift with an estimated volume of ~13 km...Ma) silicic complexes in the inner trough of the Kenya Rift Valley to outline recent progress in our understanding...group, comprising the Barrier, Emuruangogolak, Silali and Paka, E-mail address: r.macdonald@lancaster...Olkaria, the southern group constitutes the Central Kenya peralkaline province (CKPP) of Macdonald and Scaillet |  | | Report (chapter) | | peralkaline silicic rocks and caldera volcanoes of Kenya R. Macdonald Geological Society, London, Special...of Kenya R. Macdonald S U M M A R Y: The late-Quaternary trachytic caldera volcanoes of the Kenya rift...northern set of centres (the Barrier, Emuruangogolak, Silali and Paka) basalt is a major component and mugearites...plutonic processes while the volcano is at the magmatic stage. In Kenya the late-Quaternary caldera volcanoes...on the seven centres of the inner trough of the Kenya rift (Fig. 1) but, where relevant, information from |  | | Report (chapter) | | Special Publications Outline of the petrology of the Kenya rift alkaline province B.H. Baker Geological Society...October 28, 2014 Outline of the petrology of the Kenya rift alkaline province B. H. Baker S U M M A R Y...eastern branch of the E African rift system in Kenya and northern Tanzania contains nearly the whole...majority of wellstudied suites of alkaline rocks in Kenya, including some unpublished data. Apart from questions...the province The alkaline volcanic province in Kenya and northern Tanzania is associated with the development |  | | Journal (article/letter/editorial) | | magmatism in both rifts, and within the interposing Turkana re Depression. Notwithstanding the independent...independent evolution of the Main Ethiopian Rift and Kenya lP Rift prior to their quaternary linkage, magmatic...evolved compositions (flood na phonolites in Kenya, rhyolites in Ethiopia) dominated the landscape...impacted the entire region from the Afar margin to Kenya, though activity in the south Jo slightly predates...silicic volcanoes. Magmatic activity within the Turkana Depression broadly parallels that in both rifts |  | | Journal (article/letter/editorial) | | Zartman Lithospheric thickness beneath the southern Kenya Rift: implications from basalt geochemistry Received:...samples from the ¯anks and ¯oor of the southern Kenya Rift Valley in the Lake Magadi area, and from two...plateau trachytes from the rift valley ¯oor. Central volcano samples are from Ol Esayeiti and Lenderut located...Pb=15.68±15.70; Pb/204Pb=39.56± 39.71). Central volcano lavas are more alkaline in character and include...is absent beneath this section of the southern Kenya Rift. Introduction The eastern branch of the East |  | Macdonald, Ray, Sumita, Mari, Schmincke, Hans-Ulrich, Bagiński, Bogusław, White, John C., Ilnicki, Sławomir S. (2015) Peralkaline felsic magmatism at the Nemrut volcano, Turkey: impact of volcanism on the evolution of Lake Van (Anatolia) IV. Contributions to Mineralogy and Petrology, 169 (4) doi:10.1007/s00410-015-1127-6 | Journal (article/letter/editorial) | | PAPER Peralkaline felsic magmatism at the Nemrut volcano, Turkey: impact of volcanism on the evolution of...open access at Springerlink.com Abstract Nemrut volcano, adjacent to Lake Van (Turkey), is one of the most...intermediate-rhyolitic magmas. Keywords Nemrut volcano · Peralkaline magmatism · Magma mixing · Open-system...peralkaline eruptive rocks at the Nemrut caldera volcano, Turkey. Nemrut is the most active centre in Turkey...both Nemrut and the adjacent subalkaline Süphan volcano. We have selected a suite of tephra samples covering |  | | Journal (article/letter/editorial) | | interactions in volcanic rocks from the northern Kenya rift: geochemical evidence Kurkura Kabeto a,b,)...2 ) 54 wt.%. lavas from Samburu Hills, northern Kenya rift, exhibit significant variations in major and...low-alkali ŽNa 2 O q K 2 O - 9 wt.%. middle Miocene mugearite, and Pliocene benmoreite and trachyte suites....Elsevier Science B.V. All rights reserved. Keywords: Kenya rift; Bimodal volcanism; Sr–Nd isotopes; AFC; Mantle;...carbonatite–nephlinitic, and basaltic rocks in Kenya and adjacent areas indicate derivation from heterogeneous |  | | Book | | magnetic surveys in northern Tanzania and southern Kenya B.W. Darracott, J.D. Fairhead and R.W. Girdler (Newcastle...of two areas in the Kenya Rift Valley J. Wohlenberg and N.V. Bhatt (Nairobi, Kenya) Planning of the airmagnetic...results of a seismic refraction experiment in the Kenya Rift D.H. Griffiths (Birmingham, Great Britain)...southwestern Afar is there a tendency for an axial volcano-tectonic lineament (Wonji fault belt) to extend...calderas most probably represents a tensional volcano-tectonic structure affecting the Danakil horst |  | | Journal (article/letter/editorial) | | elsevier.com/locate/lithos The volcano–pluton interface; The Longonot (Kenya) and Kûngnât (Greenland) peralkaline...Available online 18 March 2014 Keywords: Longonot volcano Kûngnât syenite complex Evolution of complementary...magma reservoir(s). The trachytic caldera volcano Longonot (Kenya Rift Valley) and the Kûngnât syenite complex...Kelleher and Cameron, 1990) and the Olkaria complex, Kenya (Macdonald et al., 2008; Marshall et al., 2009)...which can be considered to be a complementary volcano–pluton pair. Although the histories of the two |  | Macdonald, R., Belkin, H. E., Fitton, J. G., Rogers, N. W., Nejbert, K., Tindle, A. G., Marshall, A. S. (2008) The Roles of Fractional Crystallization, Magma Mixing, Crystal Mush Remobilization and Volatile–Melt Interactions in the Genesis of a Young Basalt–Peralkaline Rhyolite Suite, the Greater Olkaria Volcanic Complex, Kenya Rift Valley. Journal of Petrology, 49 (8) 1515-1547 doi:10.1093/petrology/egn036 | Journal (article/letter/editorial) | | Rhyolite Suite, the Greater OlkariaVolcanic Complex, Kenya Rift Valley R. MACDONALD1,2*, H. E. BELKIN3, J....rhyolite dome and lava field in the south^central Kenya rift valley that has been marked over the past 20...(Olkaria), and the neighbouring centres on the Kenya Dome (Eburru, Longonot and Suswa). From Heumann...O F T H E G OVC The GOVC is part of the central Kenya peralkaline province (CKPP; Macdonald & Scaillet...with an area of crustal upwarping known as the Kenya Dome. Crustal thickness beneath the Dome is 30^35 |  | | Journal (article/letter/editorial) | | of the Late Pliocene (5·7 to 4·2 Ma) Mt Sidley volcano, Marie Byrd Land, is examined using major and trace...nepheline and/or apatite from basanite to derive 35% mugearite, 25% benmoreite and 20% phonolite as residual...extreme Mt Sidley, an Early Pliocene composite volcano, is at the south end of the Executive Committee...through a suite of coexisting rocks at a single volcano, often because of the preponderance of either basaltic...GEOLOGY Mt Sidley (4181 m) is a large (>200 km3) volcano composed primarily of phonolitic and trachytic |  | | 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...pyroclastic deposits around central volcanoes in Kenya often show striking variations in the abundance...on the peralkaline silicic central volcanoes of Kenya and also favours an origin by crystal fractionation |  | | Book | | fossil vertebrates in tuffs of the spectacular volcano that I had mapped in 19909. Thereafter, from 1959...sedimentological and palaeontological studies in the Kenya Rift Valley project. This, indeed, worked exceedingly... GREGORY RIFT VALLEY TANZANIA; OLORGESAILIE, KENYA I51 10. MARY D, LEAKEY. Olduvai Gorge 1911-1975:...SHACKLETON. Geological Map of the Olorgesailie Area, Kenya 171 12. 13. GLYNN LL. IsAAc. The Olorgesailie...Contents B. Tue Lake Barinco Basin, KENYA 14. GREGORY R. CHAPMAN Basin, Kenya & MAUREEN BROOK. Ghronostratigraphy |  | | Report (volume) | | continents. Field work was conducted in Chad, Ethiopia, Kenya, Malawi, Nigeria, Sudan, Tanzania and Uganda. However...Baker, B.FL Tectonics and volcanism of the southern Kenya Rift Valley and its influence on rift sedimentation...and sedimentation in the Kenya Rift from the equator northwards to Lake Turkana ... 59 Swain, C.J., Skinner...R.T. Volcano-tectonic control on sedimentation in the Koobi Fora sedimentary basin. Lake Turkana. 85 ...landtorm evolution in a rift valley basin, northern Kenya. Frostick, L.E. & Reid, I. Evolution and sedimentary |  | | Report (issue) | | (Bottom) Carbonatite lava at Oldoinyo Lengai volcano, northern Tanzania. Courtesy Alexander J. Teague...upper-mantle low-velocity anomaly beneath Ethiopia, Kenya, and Tanzania: Constraints on the origin of the...and natrocarbonatite lavas at Oldoinyo Lengai volcano, Tanzania. . . . . . . . . . . . . . . . . . ....fingerprints of mantle metasomatism beneath Nyos volcano (Cameroon volcanic line) . . . . . . . . . . ....40Ar-39Ar ages and petrogenesis of the Massif d’Ambre volcano, northern Madagascar . . . . . . . . . . . . . |  | | Report (issue) | | Drilling on the Kinagoni lead-silver prospect, Kenya. 6 • • • • • • • • • • I. Establishing ground control...come from the Department of the Environment, from County Councils and from civil engineering firms. During...copies were sold, including copies of the obsolete 'county' series, now out of print, for which the Institute...Brandon has located a further enigma in a flow of mugearite lava, like one mapped further east in the Carrickfergus...British Solomon Islands Protectorate, Fiji, Jamaica, Kenya, Malawi, New Hebrides, Swaziland and Zambia. A further |
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