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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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| Sub-provinces in the Tertiary to Recent Volcanics of Kenya By J. B. WRIGHT ABSTRACT Three sub-provinces are...southern half of Kenya as follows :— (a) the Miocene phonolite sub-province, (b) the Mount Kenya phonolite/basanite...Available supporting evidence is discussed, both from Kenya and from similar volcanic provinces elsewhere. The...contrasted volcanic associations in southwestern Kenya :— (1) Miocene mela-nephelinites, nephelinites,...sub-provinces covering much of southern Kenya as far north as Mount Elgon :— The Miocene phonolite sub-province |
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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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| 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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| 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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| ................. 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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| (1889, p. 106, and plates, sect. 4) shows that Mount Hor consists of a mass of granite capped by Cretaceous...to JSTOR Terms and Conditions ?lfak???.__ MOUNT KENYA FROM THE HAUSBERG VALLEY ON THE WEST SIDE THE...subject to JSTOR Terms and Conditions **v ^V^VvV MOUNT LONGONOT ?...TheNgurumanPlateau across LakeMagadiCo C _the Kapiti Plains._ Meru 14732 Mondul 8649 AE Arusha, 4514 / W 6365 r\...HohenloheRiFt Val/eys. VolcanicGhamof Esim/ngorMonduland Meru (F ' Faults ) Horizontal Scale vertical Scale |
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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...nephelinite, melilitite. In the case of olivine- and augite- phyric feldspathoidal lavas, especially from the...olivine þ minor Ti-augite 50% olivine þ 50% Ti-augite , 10% olivine, mainly Ti-augite the author’s fieldwork...Survey of Kenya). Straddling the border between Kenya and Tanzania, Shombole lies mainly within Kenya. It is |
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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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| 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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| assemblage comprising albite , chlorite and metastable augite, for which he pro posed an origin within some...stressed the widespread albite•chlorite-metastable augite association and assigned all of the alteration...characteris ed by albite-chlorite-sphene-metastable augite, together with numerous widely distributed occurrences...analcime, whilst albite chlorite-sphene metastable augite assemblages within the zeolite facies outcrops...ranging from the forested northern slopes of Mount Kenya, over 3300 m above sea level, northwards through |
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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...of olivine nepheline syenites with anorthoclase, augite, aegirine, sodalite and deep brown ‘barkevicite’...glassy lavas with white anorthoclase phenocrysts and augite, aegirine, olivine, and apatite in a groundmass...detailed description of the igneous rocks of Mount Kenya and an early one of the alkaline rocks of BEA |
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| The Mineralogy and Petrology of Mount Suswa, Kenya by W. P. NASH, I. S. E. CARMICHAEL, and R. W. JOHNSON...sodalitebearing, undersaturated lavas from Mount Suswa in Kenya; it is a complement to a second publication...thesis to the University of London (Johnson, 1966). Mount Suswa is a Quaternary, central-type volcano situated...situated on the floor of the Rift Valley of Kenya (Fig. la) and is composed predominantly of trachytic and...flows which, in the arid climate of this part of Kenya, are fresh and ideal for chemical study. Specimens |
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| close resemblance to the " Kapitian phonolites " of Kenya Colony, which Professor J. W. Gregory 2 regards...rhyolites do not contain the phenocrysts of felspar and augite which are abundant in the Lembobo rhyolites described...slender microliths of pale buff (tilleul-buff) augite and a small amount of dark isotropic interstitial...xenocrysts of quartz surrounded by a zone of greenish augite and (?) felspar. This rock is a limburgite " of...from the specimens collected by J. W. Gregory in Kenya Colony in 1892-3. These rocks, together with some |
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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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| 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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| below the present limits of the glaciers of Mount Kenya, which he maintains to indicate the existence...glaciation was produced by a greater elevation of Mount Kenya, and that any theory of universal glaciation...olivine-dolerite, either with granular or with ophitic augite, and olivine-basalt. The rock is often very fresh...examined and described specimens of the Laurvig augite-syenite collected by Mr. Lamplugh from the Basement |
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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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| NATURAL RESOURCES AND ENVIRONMENT Held at Nairobi, Kenya March 21 to April 3, 1974 / -<.... U.S. Geological...WITH THE / V. 5. Geological Survey GOVERNMENT OF KENYA OPEN FILE REPORT Thie report b preliminary and...natural resources and environment, held at Nairobi, Kenya, March 21 - April 3, 1974 s. Performing Org ani...resources and the environment held in ~airobi, Kenya, March 21 April 3, 1 974, attended by participants...and Document Analysis. 17o. Descriptors Training: Kenya, Ethiopia, Tanzania, Zanzibar, Malagasy, Nigeria |
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| e Geology of Mount Kenya.' By J. W. Gregory, D.Se., F.G.S. The three main zones of Kenya are characterized...liparitic equivalents of the dacites, while these Kenya rocks correspcnd with the nepheline-syenites. ]...most deeply-seated, hoIoerystaUine rock found on Kenya; and the mountain appears to represent a single...paper were given to the author by Mr. C. W. ttobley Mount Zombo, situated in long. 39 ~ 13' E. arid lat. 4...probably oligoelase, hornblende, and mgyrine, but augite and ilmenite are also present; the groundmass contains |
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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...composition from diopside, CaMgSi,Og, through aegirine-augite to aegirine. Small needles of sodic pyroxene are...production is obtained from the Amherst-Nelson County area where an anorthosite body is beneficiated |
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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...often vesicular and columnar, aud contain olivine, augite, magnetite, and apatite often in a glassy groundmass...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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| 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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| to Glacial Geology, 289. Devonian, U.S.A., 481. Augite, Brown Mica developed from, 316. Boring through...NAUHEIM and its Thermal Brown Mica developed from Augite, 316. British Association for the Advancement Salt-Springs...Echinids of Somaliland, 44 ; The Geology of Mount Kenya, 138; The Eteolite Lignite and Fourchites intrusive...Composition of, 273. Igneous Eocks of the Coast of County Waterford, 333. Igneous Eocks, Order of Consolidation...Parson, J., The Development of Brown Mica from Augite, etc., 316. Patagonia, On the Geology and Palaeontology |
