 | | Report (issue) | | (With Coloured Map) B. H. BAKER, B.Sc., Geologist KENYA SOIL SURVEY Ll?.RARY AND DATA STORAGE !'. O. a,:... FOREWORD The Machakus area was the first district in Kenya, apart from the coastal belt, in which there was...With the exception of the goldfi.elds of western Kenya it has been perhaps :the most prospected part of...an area of about 1,250 square miles in central Kenya, some 45 miles south-east of Nairobi, bounded by...report is the southwest quadrant of Degree Sheet 52 (Kenya), and is bounded by latitudes 1 ° -30' and 2" S |  | | Report (issue) | | 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 |  | | Journal (article/letter/editorial) | | 682 Plagioclases from Sultan Hamud, Kenya. By P. M. GhM~, B.Se. Department of Mineralogy, British Museum...Museum. [Read March 31, 1949.] HE plagioclase which forms the subject of this investigation was T presented...presented by Dr. C. Stansfield HiWhen, director of the Kenya Geological Survey, who has kindly sent the following...about 14 miles due north of Sultan Hamud station, Machakos district, Kenya Colon)'. From a description...transparency, and pale-green colour of this plagioclase combine to give it an mmsual appearance. The |  | | Journal (article/letter/editorial) | | Cumberland County, Maine. Blue-bladed crystals to 2.5 cm long occur at Blandford, Hampden County, Massachusetts...at Ratlum Mountain, Hartford County, and at Washington, Litchfield County, Connecticut. Kyanite associated...Salinas, Coronel Murta, Minas Gerais, Southeast Region, Brazil. Arkenstone photo. mentions that beautiful...Prospect Park area, Delaware County, and at East Bradford, Chester County, Pennsylvania; crystal groups...Willis mountains and other sites in Buckingham County, Virginia, although none of the localities are | | | Report (issue) | | the the first lii'x‘t district tlix‘triet in in Kenya, Keiitzt. apart ttpru't from l‘rotn the the coastal...heen perhaps il.t\‘ been it has lxem'n it weKenya ol' western goltliieltlx‘ of the goldfields the...Geologist. Chief ABSTRACT ABSTRACT some Kenya. some central Kenya, in central mileH in Aqunre miles 1.350...quadrant of of Degree Degree Sheet Sheet 52 52 (Kenya), (Kenya). and and is is bounded hotanied by by latitudes...lwtwtt‘tt Machakos \11tch;tlu.i~, and and Sultan ‘ittlttttt Hamud. Hztmtzd. and ' Gregory haul-t tits book |  | | Journal (article/letter/editorial) | | Co. Galway, amphibolite, axinite, epidote, plagioclase, tourmaline, 747. ASIA Arabia South Oman, meteorite...Cetine di Cotorniano, Rosia, Siena, charnockite, plagioclase, 805. onoratoite, 1037. ParnalIee, Madras, meteorite... Bihar A u s t r i a (0sterreich) Auranga-Koel Valley, Palamau, chroGreiner, Tyrol, dolomite, 138. mian...unnamed Rh sulphides, xxx. Kenya Rusinga Island, schorlomite, 775. Sultan Hamud, Maehakos district, riebeckite...samarskite, 50. Malawi Laytonville, Mendocino County~ zussmanite, 292. Tanzania Magnesioriebeekite |  | | Journal (article/letter/editorial) | | rltungameteorite, metallography, 1139. Aroostook County, Maine, ganophyllite, 893. Arrojadite, Rhodesia...Augite, New Zealand, anal., opt., 180. Auranga-Koel Valley, Palamau, Bihar, India, chromian vanadian muscovite...area, Singhbhum, India, 671. Big Creek, Fresno County, California, celsian, 914. BIGGAR (G. M.), Apatite...of pyrope from the Stockdale kimberlite, Riley County, Kansas, 450. BROUSSE (R.), see LEMAITRE(0.), xxviii...Charnockites, origin of colour of, 1135; India, zoned plagioclase in, 805. Chert, Devonshire, metamorphism of, |  | | Report (issue) | | 59 GOVERNMENT OF- KENYA MINISTRY OF NATURAL RESOURCES GEOLOGICAL SURYEY OF KENYA OF THE NORTH--MA€HÄKOS-l4EIIKA•...work at the outcrop of the boulder bed and in the valley downstream from it might well reveal other diamonds...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 |  | | Journal (article/letter/editorial) | | 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...Miocene lavas over other types west of the Rift Valley, which contrasts with the Pliocene olivine bas...the Rift Valley. It is inferred that widespread Miocene phonolites west of the Rift Valley derived from...mela-nephelinitic composition, while within the Rift Valley extensive Pleistocene trachytes differentiated |  | | Report (issue) | | REPUBLIC OF KENYA MINISTRY OF NATURAL RESOURCES AND WILDLIFE GEOLOGICAL SURVEY OF KENYA GEOLOGY OF...the geological mapping of the southern part of Kenya. The southern part of the area is an extension of...volcanics and sediments of the Magadi area of the Rift Valley (Report No. 42) whose eastern wall traverses the...Joubert who mapped the Namanga-Bissel area. The Kenya Marble Quarries Co. Ltd. have for over 40 years...Synthesis (4) Faults 30 31 32 34 36 2. The Rift Valley 36 VIII—Economic Geology 1. Limestones 2. Diatomite |  | | Book | | MINERALS& GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published...Africa 10 East African resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...now mainland Tanzania) and then progressing to Kenya - I am proud to say that the coloured gemstones...countries are among the finest in the world. The region and its gems are particularly dear to my family |  | | Journal (article/letter/editorial) | | south of Sweden;the vicinity of Stockholm and the region to the north and west, including the localities...Rrrrnrncns: Eskola, P., On the petrology of the Orijiirvi Region, etc; BuJl. Comm. GEol. Finl.and,e,no.4O, pp. l-277...Abstracts, rl.o.2t p. 123. Bnr-cruu. Veins of plagioclase,biotite, and quartz with subordinate xenotime...xenotime and yttrocrasite in the Bastogne region of southeastern Belgium are consideredby Corin to be pegmatites...lithium, beryllium, tin, and antimony phases in the region surrounding Limoges (Haute-Vienne) in the northern |  | | Journal (article/letter/editorial) | | Vergleich cter Analgsem'esultale des OIigoklas yon Sultan Hamud I Geol. Survey (IOENSU) nal3chem, ETH Ziirieh...1)ezogen. (J. Makart, 1961). An einem Oligoklas (Sultan Hamud, Stidwest-Afrikal*, der am Amer. Geol. Survey...Kaaden, G. v. d., Optical studies on natural plagioclase feldspars with high- and low-temperature optics...strontium and barium in the eruptive rocks of the Oslo region. Norsk. Geol. Tidsskr. 38 (1058), 221--230. - -...Variations in X-ray powder diffraction patterns of plagioclase feldspars. Amer. Min. ~1 (1956), 632-6t7. - - |  | | Journal (article/letter/editorial) | | The powder patterns and lattice parameters of plagioclase felspars. I. The soda-rich plagioclases. By J...partially heated natural plagioclases and the plagioclase from the dacite give parameters indistinguishable...method for the determination of composition in the region An0-Ans0. If the composition is known the powder...the determination of the thermal state. If the plagioclase can be judged to be in the low-temperature state...prolonged heating just below the solidus. A natural plagioclase from a high-temperature environment, rhyolite |  | | Report (issue) | | KINGDOM AND COLONIAL TERRITORIES United Kingdom Kenya • • Uganda • • Tanganyika • Nyasaland • • Bech uanaland...13•87 1·17 Additional analyses of vermiculite from Kenya, Tanganyika, the Transvaal, Western Australia. the...Corundum Hill, North Carolina. 6 Vermiculite, Fresno County, California. 7 Griffithite, California. a Vermiculite...and ,8-9 ·5 respectively. 'fhe pH value of some Kenya vermiculites was found to range between 8 ~s and...whilst others, richer in iron, e.g. some of the Kenya, Tanganyika and Uganda material, will give a bronzy |  | | Book (chapter) | | Chapter 10 EXSOLUTION TEXTURES in TERNARY and PLAGIOCLASE FELDSPARS; INTERFERENCE COLORS P. H. Ribbe INTRODUCTION...deal with the sequences of Al,Si ordering in plagioclase feldspars, including peristerites and B^ggild...the phase relations of these regions of the plagioclase subsolidus. The concepts of the coherent solvus...laboratory. There is much to learn in principle about plagioclase exsolution by analogy with alkali feldspars,...diffusivities within the AISi 0 framework. -3 o Plagioclase in- tergrowths are generally submicroscopic |  | | Journal (issue) | | Photogeological REPORTS FROM THE GEOLOGICAL SURVEYS Kenya • • • • • Uganda • • • • • • Tanganyika • • • •...that Lake Gombo, a minor lake in the Mukondokwa Valley of Tanganyika, which fills only in years of exceptionally...659-661. -1925. '' The physiography of the Shire Valley.'' Ann. Rep. Geol. Surv. Nyasaland, pp. 5-6. GILLMAN...speed of magnetometric work. In the particular region where the present writer has carried out his researches...pronot1nced and produce an eluvial cover; in such a region, however, it is maintained that geophysics, and |  | | Journal (issue) | | • • • • • With appended summary reports on: I Kenya • • • • • • Uganda • • • • • • Tanganyika...Hall, Jamaica • • . facing p. 117 Rio Grande Valley, near Comfort Castle • • • Plate III Pyrolusite...tributary of the Rio Grande (see Plate I). The wide valley of the Rio Grande separates the main Blue Mountain...a motor road which runs for 13 miles along the valley of the Rio Grande from Port Antonio to Comfort...necessary before the deposits could be developed. The valley of the Rio Grande at Comfort Castle is excavated |  | | Journal (issue) | | Rhexoxylon and Dadoxylon from the Lower Shire Region of Nyasaland and Portuguese East Africa. By Professor...176 182 REPORTS F,ROM THE GEOLOGICAL SURVEYS Kenya • • • • • • I • • • • 183 Uganda •...Rhexoxylon africanum Banc. Half the expanded pith region of a large stem, with shreds of normal secondary...strike to the north-west, as for example in the valley of the stream 142 COLONIAL GEOLOGY AND MINERAL...Text-fig. 2),, on the dip-slope of the Guma Water valley (F), and on the promontory at Lumley (G). There |  | | Journal (issue) | | the Colonies With appende,d summary reports on: Kenya . Uganda • Tanganyika . • • • • • • Northern...Resources COLONIAL GEOLOGICAL ABSTRACTS Part I .-Kenya . • • • • •• Vll ••• Vlll CONTENTS PAGE...selection of these abstracts deals exclusively with Kenya. Papers published since 1950 have been abstracted...ankaramite types and occasional flows rich in phyric plagioclase. The liquid line of descent may be traced through...1936). Yet other flows contain abundant phyric plagioclase. The series is cut by numerous dykes which may |  | | Journal (issue) | | reports on Nigeria, Gold Coast, Sierra Leone, Uganda, Kenya, Tanganyilra, Nyasaland, Bechuanaland, S,vaziland...Carbonatite Cores • • The Geology of the Upper Zambezi Valley • • South Australian Drillers' Convention • • •...complete submergence of their basal portions and the valley topography between them. A notable feature of the...pyroxene which is sometimes porphyriticJ laths of plagioclase, and iron ore. The last constituent often reaches...Mt~ Camizard at the southern end of Trois Ilots Valley. This, too, is a conical hill having two eminences |  | | Journal (issue) | | . 308 REPORTS FRO.NI THE GEOLOGICAL SURVEYS Kenya • • • • Uganda • • • Tanganyika • • Northern...Maloney fault respectively. In addition, in the region of the Moruga road, it seems to be interrupted...be seen at Galfa Point and in the Sangre Grande region. 299 GENERAL AND ECONOMIC GEOLOGY OF TRINIDAD...sh.oals in these Ranges and also in the Naparima region. These shoals afforded favourable conditions for...hanging valleys (upper part of Tucker Valley, Diego Martin Valley). The melting of the Diluvial ice caps |  | | Journal (issue) | | • PAGE ARTICLES The Wolfram Deposits of Singo County, Buganda Province, Uganda. By Basil C. King, D...Industries in Under-de\An Occurrence of Nitrates in Kenya Li...Map showing Positions of Wolfram Deposits, Singo County • • • • ,, 309 Fig. 4 Wolfram Workings, Kyasampawo... • e X ' • THE WOLFRAM DEPOSITS OF SINGO COUNTY, BUGANDA PROVINCE, UGANDA By BASIL C. KING, D.Sc...hill-tops in • I THE WOLFRAM DEPOSITS OF SINGO COUNTY 307 the granite areas correspond approximately |  | | Book (volume) | | properties Paragenesis 7 ..... 55 ......... 66 PLAGIOCLASE.94 Structure ......... Morphology and twinning...of Minerals. FELSPAR GROUP Alkali Felspars Plagioclase (K, Na) [AlSi308j Na [A]Si308]-Ca[Al2Si208]...felspars, and those between NaAlSiaOs and CaA^S^Og plagioclase felspars. The alkali felspars generally contain...members can contain a little more. Similarly the plagioclase felspars generally contain Or Fig. 1. Illustrating...solution in the felspars. The nomenclature of the plagioclase series and the high-temperature alkali felspars |  | | Journal (volume) | | Rhexoxylon and Dadoxylon from the Lower Shire Region of Nyasaland and Portuguese East Africa . By Professor...307 The Superficial Deposits of the Lower Shire Valley, Nyasaland. By Alex. Muir, B.Sc., Ph.D., and I... CONTENTS PAGE REPORTS FROM THE GEOLOGICAL SURVEYS Kenya Uganda Tanganyika . Northern Rhodesia Nyasaland...Rhexoxylon africanum Banc . Half the expanded Pith Region of a large Stem, with Shreds of normal Secondary...Photomicrographs of San Jorge Rocks 1. Hornblende -augite-plagioclase -schist, Salavo . 2. Albite - epidote -amphibolite |
|
