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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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| 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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| 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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| Differentiation Trends in Tertiary to Recent Lavas of Kenya* By J. B. WRIGHT ABSTRACT The distribution of Tertiary...Tertiary to Recent lavas in part of south-west Kenya is outlined, and attention drawn to the predominance...feldspar versus silica, for analysed lavas from Kenya and Tanganyika, are used to illustrate the trends...nephelinitic lavas and carbonatite complexes in Kenya is discussed and the possibility mooted that the... INTRODUCTION THE Tertiary to Recent lavas of Kenya are a typical continental sodic alkaline suite, |
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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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| Sillimanite as an Index of Metamorphic Grade in the Kenya Basement System 1 By L. D . SANDERS (PLATES I AND...in these circumstances its distribution in the Kenya Basement System is reviewed and the field relationships...and faserkiesel migmatites occurring in central Kenya are described. It is concluded that sillimanite...high-grade metamorphic conditions prevalent in Kenya during Basement System times were accompanied by...the Commissioner of Mines and Geology, Nairobi, Kenya. The Status of Sillimanite 145 however, caused |
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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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| 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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| 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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| 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...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°...phenocrysts consist of plagioclase, probably oligoclase, hornblende, and segyrine, but augite and ilinenite |
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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...Appendix B. East African Gemstones in the Los Angeles County Museum of Natmal History Collections 138 Appendix |
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| 59 GOVERNMENT OF- KENYA MINISTRY OF NATURAL RESOURCES GEOLOGICAL SURYEY OF KENYA OF THE NORTH--MA€HÄKOS-l4EIIKA•...an area of about 1,200 square miles of central Kenya in the Central and Southern Provinces, about thirty...report covers the quarter degree sheet 52 N.W. (Kenya) (Directorate of Overseas Surveys sheet No. 149)...extent and lies partly in the Southern Province of Kenya, administered from Machakos, and partly in the Central...height from 4,000 feet to 7,000 feet. Throughout Kenya erosion bevels have been recorded on the Basement |
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| 67 GOVERNMENT OF KENYA MINISTRY OF NATURAL RESOURCES GEOLOGICAL SURVEY OF KENYA GEOLOGY OF THE KIJABE...covered by the south-east quarter of degree sheet 43 (Kenya) and is bounded by latitudes 0° 3(y and 1 ° 00'...1:250,000. Communications.—The railway line between Kenya and Uganda as well as the tarmacadamized road between...51.56 inches, but it is only 26.89 inches on the Mount Margaret Estate in the Rift Valley at about ) 6...officers of the Provincial Administration and to the Kenya Police during the survey, in particular the latter |
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| 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...1,400 square miles of South Nyanza, in western Kenya, on the shore of Lake Victoria! The land area is...part of the south-west quarter of Degree Sheet 41 (Kenya), corresponding with the Directorate of Colonial...dissected volcano, of even larger areal extent than Mount Elgon. The slopes are steep, traversed by numerous |
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| is ascribed to " a n acid magma . . . rich in oligoclase, poor in ferromagnesian components, and fairly...magma (points 15, 16, 17, and 18). From Dutchess County in the State of New York, Barth (1936) has described..." Structural and Petrologie Studies in Dutchess County, New York," part ii, Bull. Geo. Soc. Amer., xlvii...Bengal," Min. Mag., xx, 365. The Geology of N.E. Kenya. 215 TILLEY, C. E., and HARWOOD, H. F., 1931....Province, Kenya Colony. By H. G. BUSK. I. INTRODUCTORY. «. rPHE fertile highlands of Kenya, of which |
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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...production is obtained from the Amherst-Nelson County area where an anorthosite body is beneficiated...produced from a quartz monzonite gneiss in Hanover County, Va., and this is acceptable in flint glass after |
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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...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 |
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| (1988), MPL should be referred to as a ‘‘high-K oligoclase anorthosite.’’ Roseland. The amount of feldspar...‘‘high-K andesine anorthosite’’ and ‘‘high-K oligoclase anorthosite.’’ Major-element variations Major-element...the ternary, and lie in the field of potassic oligoclase but close to the boundary of the anorthoclase...termed soda sanidine, anorthoclase, oligoclase, and potassic oligoclase. Figure 14 shows only those compositions...Sources and nomenclature: Boudette & Ford (1966, K-oligoclase, anorthoclase), Dawson et al. (2008, anorthoclase) |
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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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| 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)...however, has shown that similar anomalies in the Kenya Rift Valley must be so interpreted. This paper describes...positive anomaUes, to compare them with those found in Kenya, and to see how closely the small gravity highs |
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| f Cretaceous. 3. Conducia and Monapo Beds. 2. Mount Meza Beds. 1. Fern,5() Velloso Beds. Pre-Cambrian...fel- Mount Meza and spathic,with calcareous the adjoining bands. district, i Monapo Beds. " Mount Meza...were collected by Mr. Reid during a journey to Mount Meza. In the case of three of his specimens, the...(an. Bailey, Lewis, & Hall). Andrews Point, Essex County, Mass., U.S.A. (an. Washington). SSlvsberget, Gran...Africa (an. Eyme). Phonolite. Base of Mount Hohnel, Mount Kenya, B.E. Africa (an. Prior). Tinguuite. Edda |
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| The highest elevations are: Mount Charles (Moehau) 1340 feet, Sandy Mount 1068 feet, and Harbour Cone...heights are greate~ and the valleys more profound. Mount Cargill (2232 feet), Flagstaff (2204), Signal Hill...about 250 feet above the present sealevel. At Sandy Mount the change of sea-level has been responsible for...Trachydolerite. Andesite. Nepheline-basanite. ( ])olcrite, Mount-Charlestype. 16. ~ Dolerite, Papanui type. 17. Basalt...been blown over a saddle 800 feet high at Sandy Mount and 400 feet high at Rauone. This sand is formed |
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| frequently zoned. Its composition falls within the oligoclase to andesine range. The quartz is found filling...matrix of quartz, microperthite and subordinate oligoclase, together with flakes of biotite and muscovite...appearance. In a number the plagioclase is still oligoclase, but in others it is albite, these latter being...sometimes feebly porphyritic. The feldspar is oligoclase, potash feldspar occurring only as an accessory...to five centimetres long, in a matrix of zoned oligoclase, quartz, potash feldspar and flakes of biotite |
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| mining areas cross international borders, e.g. Kenya/Tanzania, Thailand/Cambodia and, conversely, large...corundum from Kitui, Kenya Dr N. R. Bamt~ and Dr RR. Harding** "The Ruby Centre, Kenya "'"*GAGTL, Great...of pink corundum in the eastern foothills of Mount Kenya is described. The corundum occurs in gravels...yield is good quality and the stones are cut in Kenya or in Germany. Corundum beads dyed red in India...through Ethiopia, through north-west to south-east Kenya and across Tanzania to Mozambique. In geological |
