 | | 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 |  | REN, M, OMENDA, P, ANTHONY, E, WHITE, J, MACDONALD, R, BAILEY, D (2006) Application of the QUILF thermobarometer to the peralkaline trachytes and pantellerites of the Eburru volcanic complex, East African Rift, Kenya. Lithos, 91 (1) 109-124 doi:10.1016/j.lithos.2006.03.011 | Journal (article/letter/editorial) | | the Eburru volcanic complex, East African Rift, Kenya Minghua Ren a,⁎, Peter A. Omenda b , Elizabeth Y...785, KenGen, Moi South Lake Road, Naivasha 20117, Kenya c Department of Earth Sciences, Eastern Kentucky...Quaternary Eburru volcanic complex in the south-central Kenya Rift consists of pantelleritic trachytes and pantellerites...2006 Elsevier B.V. All rights reserved. Keywords: Kenya; Eburru volcanic complex; Trachyte; Pantellerite;...Olkaria Volcanic Complex (GOVC) in the south-central Kenya rift, where Pb isotopes and U-series disequilibria |  | Macdonald, R., Bagiński, B., Belkin, H.E., White, J.C., Noble, D.C. (2019) The Gold Flat Tuff, Nevada: Insights into the evolution of peralkaline silicic magmas. Lithos, 328. 1-13 doi:10.1016/j.lithos.2019.01.017 | Journal (article/letter/editorial) | | involving AC an incompletely resolved assemblage of albite, ilmenite and baddeleyite. These feldspar crystals...recorded it in comendites of the Olkaria complex, D Kenya Rift Valley, where it forms hexagonal crystals up... Although comendites from the Olkaria complex, Kenya, PT E have F contents >1 wt% (Macdonald et al...(1977) described from the peralkaline volcano PT E Emuruangogolak, Kenya Rift, syenite blocks which are closely...analogue may be the basalt-trachyte caldera volcano Silali (Kenya Rift Valley), where Macdonald et al. (1995) |  | Macdonald, R., Bagiński, B., Leat, P.T., White, J.C., Dzierżanowski, P. (2011) Mineral stability in peralkaline silicic rocks: Information from trachytes of the Menengai volcano, Kenya. Lithos, 125 (1) 553-568 doi:10.1016/j.lithos.2011.03.011 | Journal (article/letter/editorial) | | Information from trachytes of the Menengai volcano, Kenya R. Macdonald a,b,⁎, B. Bagiński a, P.T. Leat...Available online 17 March 2011 Keywords: Menengai volcano Peralkaline trachytes and rhyolites Mineral stability...silicaoversaturated trachytes from the Menengai volcano, Kenya Rift Valley. The dominant phenocryst assemblage...East African Rift System. Volcanic centres in the Kenya Rift Valley where pantelleritic trachytes have been...Macdonald et al., 1970), Nasaken (Weaver et al., 1972), Silali (Macdonald et al., 1995), and Emuruangogolak (Black |  | | 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 |  | | Journal (article/letter/editorial) | | metal (Fe Kα), MgO (Mg Kα), orthoclase (K Kα), albite (Na Kα), fluorite (F Kα), synthetic alforsite (Cl...and silica-filled cavities consist of almost pure albite (Ab97Or1An2). Where unexsolved, the matrix feldspar...Sørensen, 2005; Neumann, 1976), and Warrumbungle volcano, NSW (Duggan, 1988). a: Variation in the diops...pyroxene in felsic volcanics from the Warrumbungle Volcano, central New South Wales, Australia. Mineralogical...498–516. Macdonald, R., 2003. Magmatism of the Kenya Rift Valley: a review. Transactions of the Royal |  | | Journal (article/letter/editorial) | | and geochemical study on the Quaternary Gedemsa volcano in the Main Ethiopian Rift, Ayalew et al. (2001)...composition of the WI rhyolites (open circles): a Albite–Anorthite–Orthoclase diagram showing the composition...plagioclase phenocryst composition towards the Albite end-member along with sudden changes in plagioclase...suite from the southern part of the Gregory Rift, Kenya. Contrib Mineral Petrol 64:303–332 Baker JA, Macpherson...alkali basalt-trachyte suite from Jebel Marra volcano, Sudan, through assimilation and fractional crystallisation |  | | 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 |  | Upton, B. G. J., Macdonald, R., Odling, N., Rämö, O. T., Bagiński, B. (2013) Kûngnât, revisited. A review of five decades of research into an alkaline complex in South Greenland, with new trace-element and Nd isotopic data. Mineralogical Magazine, 77 (4) 523-550 doi:10.1180/minmag.2013.077.4.11 | Journal (article/letter/editorial) | | magma chamber (or chambers) beneath a central-type volcano, exhibits various features of petrological interest...feldspars contain a single albite phase (approaching low-temperature albite) and both monoclinic and triclinic...sodic amphiboles, aegirine, microcline and late albite are notably absent. Pegmatites Pegmatites are abundant...such as the peralkaline trachytes of Menengai volcano, Kenya (Macdonald et al., 2011), and in experimental...and peralkaline rhyolites of the Olkaria complex, Kenya (Macdonald et al., 2008). The trend is taken to |  | | 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...British Solomon Islands Protectorate, Fiji, Jamaica, Kenya, Malawi, New Hebrides, Swaziland and Zambia. A further...within this area. Kenya : Dr M. C. G. Clarke finished a two-year secondment to the Kenya Geological Survey |  | | Book (edition) | | historic eruptions 251 and natural gas 130 13.11 Volcano prediction 257 9.10 Exploration for oil and...ask: What are the lavas made of? How does the volcano work and how is the heat generated? Where do the...the lavas and gases come from? When did the volcano first begin to erupt and when is it likely to erupt...It is quite useless, for example, to ask why a volcano erupts, or why the sky is blue, or why there are...Sicily, Hephaestus was identified with the local volcano-god Vulcan or Volcanus. The eruptions of lava and |  | | Report (volume) | | concentrations in dry 39 season pastures in western Kenya Maska tt, J. & THornToN, I. The distribution of...utilization by elephants in the Mount Elgon Region, Kenya 63 Seiinus, O. FRANK, A. & GALGAN, V. Biogeochemistry...acid 213 223 25h and gas contamination at Poas volcano, Costa Rica 239 Ouiver, M. A. Kriging: a method...range of developing countries including India, Kenya, Tanzania, Uganda and Sri Lanka. Of the 34 papers...Zimbabwe (Fordyce et al.), Kenya (Jumba et al; Maskall & Thornton) and the Kenya-Uganda border area (Bowell |  | | Journal (issue) | | of calcite and trona from hot-spring deposits in Kenya and New Zealand ..... . . . . . . . . . . . . ....Geologic map of the San Acacia Quadrangle, Socorro County. New Mexico: United States Geological Survey, Geologic...Bullion Creek and Slope Formations (Paleocene), Adams County, North Dakota [unpublished M.S. lhesis ]: University...ground-water resources of northeastern Socorro County, New Mexico: New Mexico Bureau of Mines and Mineral...and ground-water conditions in eastern Valencia County. New Mexico: United States Geological Survey Ground-Water |  | | Book (volume) | | 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...Wavellite sprays (up to 30 mm across) from Montgom ery County, Arkansas, USA. Museum Victoria specimen M27840...include barite, celestite, opal, amorphous silica, albite, haematite, pyrite and other sulphides, apatite... Al2 Si2 O5 ðOH4 Þ þ 2Naþ þ 2HCO 3 þ 4H4 SiO4 albite þ carbon dioxide þ water ! kaolinite þ sodium ions |
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