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| occur in the carbonate-rich tufts and lavas of Mount Elgon; kaersutite-rich pyroxenites and a suite of...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...kenyte lavas of the mountain; the pyroxenites of Mount Elgon are also cumulates whose predominant titanaugite |
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| Rocks from Kenya 67 A Suite of Hypersthene-bearing Plutonic Rocks in the Meru District, Kenya 1 By WILLIAM... WO years before the 1914-1918 war settlers in Kenya were attracted by an occurrence of mica-bearing...of hills in the southern Meru District, about 34 miles east of Mount Kenya. Interest continued during...Lateritic ironstone. U. TERTIARY Kenyte lavas of the Mount Kenya Suite. • great unconformity ("Mica pegmatites...permission of the Commissioner of Mines, Nairobi, Kenya. 68 W. Pulfrey— The frame of the intrusions—Basement |
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| COMPOSITION OF ANORTHOCLASE AND NEPHELINE IN MOUNT KENYA PHONOLITE AND KILIMANJARO TRACHYTE, AND CRYSTAL–GLASS...for anorthoclase and glass in phonolite from Mount Kenya and trachyte from the Kibo cone of Kilimanjaro...Kilimanjaro, and for nepheline in the Mount Kenya specimen. With the exception of Ba and Sr in anorthoclase, Eu...from Pantelleria and the western U.S.A. In the Mount Kenya phonolite, nepheline concentrates Li, Be, Mg...nepheline, glass, trace-element partitioning, Mount Kenya, Kilimanjaro, East Africa. Sommaire Nous présentons |
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| 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northern Tanzania contains nearly the whole...majority of wellstudied suites of alkaline rocks in Kenya, including some unpublished data.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 |
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| No. 33 COLONY AND PROTECTORATE OF KENYA GEOLOGICAL SURVEY OF KENYA GEOLOGY OF THE NORTH KITUI AREA...and Pleistocene vulcanicity connected with Mt. Kenya and the Nyambeni Range, the area is entirely occupied...Intrusives 2. Post-Basement System Rocks (1) Mt. Kenya Series (2) Tertiary Sediments—Massisini Series (3)...described in this report is situated in central Kenya and is bounded by the equator, latitude 0° 30' S...acid and basic intrusives; (2) rocks of the Mount Kenya series which are represented only by a small |
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| NATURAL RESOURCES GEOLOGICAL SURVEY OP KENYA GEOLOGY OF THE MOUNT KENYA AREA DEGREE SHEET 44 N.W. QUARTER...reference number concerned. GEOLOGY OF THE MOUNT KENYA AREA DEGREE SHEET 44 N.W. QUARTER (with coloured... FOREWORD The geological survey of the area around Mt. Kenya, a dissected volcano which forms Kenya's highest...earlier glaciers. Mr. Baker also shows that Mt. Kenya was formerly covered by an ice cap 400 sq. kms....Series .. .. ' Nyeri Tuff Laikipian Basalts The Mount Kenya Suite (1) The Main Eruptive Episode (a) The lower |
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| NOTE ON THE KAPITI PHONOLITES AND KENYTES OF KENYA COLONY W. CAMPBELL SMITH ROCKS COLLECTED BY W. THESIGER... NOTE ON THE KAPITI PHONOLITES AND KENYTES OF KENYA COLONY BY W. CAMPBELL SMITH WITH NEW CHEMICAL... NOTE ON THE KAPITI PHONOLITES AND KENYTES OF KENYA COLONY By W. CAMPBELL SMITH With new chemical...the strati graphically later (i.e. younger) Mt. Kenya Volcanic Suite. Under the microscope, however, it...Gregory for the lavas around the central plug of Mt. Kenya, of which black glass and large anorthoclase crystals |
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| ................. II. Physical Geography of Mount Kenya ..................... III. Petrography ........Stratigraphy of ]l~ount Kenya ........................ V. The Geological History of Mount Kenya .................. VI. Kenya and Kilima Njaro .................................... VII. Summary of Conclusions .........211 216 210 218 220 221 L INTRODUCTION. MOU~T KENYA, the greatest mountain in British East Africa, wa~...of Kitui. No suggestion as to the structure of Kenya was made until 1883, when Joseph Thomson, after |
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| in the extreme north, immediately south of the Kenya border, where basaltic lavas from Oldoinyo Sambu...Kirikiti and Olorgesaile basalts immediately north in Kenya, extruded at 5.0 to 1.0 Ma (Baker et al. 1972; Fairhead...Survey of Kenya). Straddling the border between Kenya and Tanzania, Shombole lies mainly within Kenya. It is...volcanoes, with its northern slopes descending into Kenya. From the west and east it appears a broad dome...trachybasalt and phonolite. Just to the south of the Kenya border, the lowest lavas rest upon basement quartzite |
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| 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 |
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| No. 23 COLONY AND PROTECTORATE OF KENYA GEOLOGICAL SURVEY OF KENYA A GEOLOGICAL RECONNAISSANCE OF THE...of ancient rocks, extending between Meru, north-east of Mount Kenya, and Kitui. The quarter-degree areas...ultrabasic intrusives that are so prominent in the Embu-Meru area, and which it was anticipated would continue...Basement System, which are the oldest rocks known in Kenya. Apparently at present no economic significance...the Nyanzian or Kavirondian systems of Western Kenya, which have been valuable for the gold and silver |
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| phonolites and trachytes from the summit region of Mt. Kenya R.C. Price 1, R.W. Johnson 2, C.M. Gray 1, and F...summit region of the Plio-Pleistocene volcano, Mr. Kenya. Most of the samples are moderately or strongly...suite of samples from the summit region of Mt. Kenya. The suite covers a range of phonolitic and trachytic...alkalic compositions. Geological setting. Mr. Kenya, which reaches a summit of 5,200 m is a central...some to be Offprint requests to: R.C. Price oUT KENYA XO5% ,'~)Ab erdare Range I ~)1 Esakut & OI Esayeti |
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| recorded. Part II, dealing with ‘The Geology of Mount Kenya’ (Gregory 1900c) may have been prompted to be...the most unusual alkaline rocks collected from Mount Kenya, for which he coined a new name ‘kenytes’. The...phenocrysts and augite, aegirine, olivine, and apatite in a groundmass of feldspar microliths and pyroxenes...detailed description of the igneous rocks of Mount Kenya and an early one of the alkaline rocks of BEA...British East Africa—Part II. The Geology of Mount Kenya. Quarterly Journal of the Geological Society |
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| thence, skirting the northern flanks of Mt. Kenya, to Meru and Archer's Post on the northern Uaso Nyiro...southwards merges into the northern slopes of Mt. Kenya. The lower plain is broken to the north and west...of Somalis and rarely crossed by a European. From Meru northwards, through the centre of the Northern Frontier...flows, extending from the northern flank of Mt . . Kenya�form characteristic scenery. These flows are not...paJ:t of the Protectorate. The serTated mass of Kenya, so different from the almost perfect cone of the |
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| noted gemologist and geologist, Dr. Peter Keller. Kenya and Tanzania are revealed in their full mineralogical...of the 'Irelawney Collection of the Los Angeles County Museum of Natural History. ♦ Figures vii Foreword...Tanzania 32 Sapphire from Kenya 42 Ruby from Mangari, Tsavo West National Park, Kenya 44 Chapter 4. Emerald...Red Dravite Tourmaline from the Narok District, Kenya 99 Uvite-Dravite Chrome Tourmaline 99 Chapter 8...ActinoliteTtemolite 111 Agate 114 Amazonite 114 Amethyst ll7 Apatite 117 Beryl ll8 Diopside ll9 120 Enstatite 121 Euclase |
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| No. 90 REPUBLIC OF KENYA MINISTRY OF NATURAL RESOURCES Geological Surrey of Kenya GEOLOGY OF THE AMBOSELI...of about 730 square miles situated in southern Kenya at the foot of Mt. Kilimanjaro. It is enclosed by...longitudes 37°00' and 37°30'E, latitude 2°30*S and the Kenya-Tanzania border. Hills in the north preserve relics...this report, the Amboseli area is defined as the Kenya part of the south-western quarter of Degree sheet...37°00' and 37°30'E, the parallel 2°30'S and the Kenya-Tanzania boundary. The area includes a large portion |
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| ranging from the forested northern slopes of Mount Kenya, over 3300 m above sea level, northwards through...21 21 FIGURES 1 Generalised geological map of Kenya showing location of Samburu-Marsabit project area...exploration in the central part of the Phase One area. Kenya Geological Survey maps, on the scale of 1: 125 000...Falls- Lake Hannington area. Further north the Kenya Rift Valley Project of the East African Geological...Department, Machakos Road, PO Box 30009, Nairobi, Kenya. 18 SUDAN 36 ° 38 ° ETHIOPIA 40 ° . �---�- |
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| in Commonwealth Countries United Kingdom Ghana Kenya Malawi Rhodesia Sierra Leone Tanzania Uganda Zambia...nepheline-bearing rocks in parts of Uganda and Kenya page 62 Figure 6 Nepheline-syenite occurrences...are crucial as transportation costs can quickly mount up to a prohibitive level. Although some dark-coloured...where it is separated as a by-product of the Kola apatite mines. The review of world occurrences of nepheline-syenite...constituents. Other minerals, e.g. zircon, sphene, apatite, garnet, normally occur in small amounts and are |
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| trachyte and phonolite from the Suswa volcano, Kenya rift John Charles White a,⁎, Vanessa V. Espejel-García...Tower, Upper Hill, P.O. Box 10076–00101, Nairobi, Kenya a r t i c l e i n f o Article history: Received...February 2012 Keywords: Trachyte Phonolite Central Kenya Peralkaline Province a b s t r a c t Suswa is the...the southernmost volcanic center in the Central Kenya Peralkaline Province (CKPP) and represents the only...Elsevier B.V. All rights reserved. 1. Introduction Mount Suswa is a large (>700 km 2) trachytic shield volcano |
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| 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 |
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| The Geology of Mount Kenya." By J. W. Gregory, D.Sc, F.G.S. The three main zones of Kenya are characterized...liparitic equivalents of the dacites, while these Kenya rocks correspond with the nepheline-syenites. The...columnar, aud contain olivine, augite, magnetite, and apatite often in a glassy groundmass. The pyroclastic rocks...most deeply-seated, holocrystalline rock found on Kenya; and the mountain appears to represent a single...paper were given to the author by Mr. C. W. Hobley. Mount Zombo, situated in long. 39° 13' E. and lat. 4° |
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| close resemblance to the " Kapitian phonolites " of Kenya Colony, which Professor J. W. Gregory 2 regards...from the specimens collected by J. W. Gregory in Kenya Colony in 1892-3. These rocks, together with some...[N 416,417]. Rather similar rocks, phonolites (Kenya type), but richer in nepheline, were recorded in...they probably come very near to Prior's phonolite (Kenya type) .2 N 720, a flow-banded lava, is only a devitrified...particular type known from Kenya Colony, but its close relationship to the Kenya type is obvious. The phenocrysts |
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| emplacement of the phonolitic Yatta lava flow, Kenya 285 vi CONTENTS MAHANEY, W. C., BARENDREGT...Neogene volcanics and interbedded palaeosols near Mount Kenya 301 CAPITANIO, F. A., FACCENNA, C., FUNICIELLO...characteristics of a 350 km long middle Miocene lava in Kenya to determine a minimum slope required for its outflow...determine a minimum elevation of the source region in Kenya in middle Miocene times of 1400 m. Mahaney et al...2 Ma palaeosols preserved between lavas near Mt Kenya. They use these palaeosols to infer the continental |
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| 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...Tanganyika. b. In generally unaltered rocks: Ravalli County, Montana, and Verity, British Columbia. Similar...Sphene, ilmenite, rutile, Ti-magnetite, zircon, apatite, pyrochlore Volatile elements: F, Cl, H,O H |
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| allied to diopside, phlogopite (mica), sanidine, apatite, ilraenite, and a not inconsiderable amount of...(except in bearing leucite) with the kenyites of Mount Kenya,1 and belong to the family of trachy-dolerites...olivine, nepheline, haiiyne (scarce), magnetite, apatite, ilmenite, and zircon, and the groundmass, often |
