 | | Report (issue) | | 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...centre at Rangwa became the focus of a central volcano, much of which is still preserved and when traced...(2) The Kisingiri Volcano (a) The Updoming of the "Sub-Miocene" Peneplain surface under Kisingiri (b) The...The Kisingiri Volcanic Series (i) The Lower Kisingiri Nephelinite Lavas (ii) The Middle Kisingiri Pyroclastic |  | | Report (chapter) | | Olivine-rich nephelinites occur in basanitic and alkali basalt provinces, normally without carbonatites. These.../ K i ;1:/\. - u3-'~."\ -r ~ \\ -/:/ ", KENYA u __-/~.'\- " :. / I 2 ~ i TANZANIA 9 ~ ...rich, and are typically associated with alkali basalt and basanite volcanic provinces. Group II nephelinites...4- • LODWAR ~t~ MOROTO z --2 0 NAPAK ~ KENYA C e n o z o i c l a v a s and pyroclastic deposits...+ NYAMBENI I&UISHU ~ Kavirondo ~ M T . ~ A KENYA Olivine-poor volcanic A Olivine-rich volcanic |  | | Journal (article/letter/editorial) | | whole rock isochrons for the Monchique and Mt. Kenya complexes, together with a series of 87Sr/86Sr ratios...limited initial ratio variation within the oceanic basalt range. Such variation is ubiquitous in alkaline...crystallises in the normal manner of the alkali basalt-trachyte volcanic suite. "Carbonatitic" suites...(Dawson, 1966) ; iii) products of reaction between basalt and carbonatite (Van Groos, 1975); iv) ultra-fenitised...higher ratios, possibly lying outside the oceanic basalt range, than origins (3) to (5). Unfortunately, |  | | 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...Valley, which contrasts with the Pliocene olivine basalt-trachytecomendite association predominating within...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 |  | | Journal (article/letter/editorial) | | Rangwa and Ruri Carbonatite Complexes in Western Kenya By G. J. H. MCCALL (PLATES XII-XIII) ABSTRACT ...cauldron subsidence is involved in some of the Kenya complexes is considered. rocks, containing melilite...principal constituent, were first described from Kenya by Pulfrey (1953), who mapped a small dyke at the...the south-west foot of the Tinderet nephelinite volcano (McCall, 1956). Further occurrences of alnoitic...islands, as well as some of the volcanic rocks of Kisingiri, are sparsely distributed and include alnoitic |  | | Journal (article/letter/editorial) | | 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 |  | | Report (chapter) | | which migrated back and forth across Ethiopia, Kenya and Tanzania, with a western limit at about 38°E...limestones, shales and sandstones, in Ethiopia and Kenya, suggests low to moderate relief in the source areas...about 20 ° further south than at present. Small basalt eruptions occurred in Somalia (Jurassic) and in...greatest elevation (to about 500 m) was in central Kenya and in Ethiopia (Saggerson & Baker 1965). Meanwhile...monoclinal warping and local faulting along the Kenya-Uganda border (Baker & Wohlenberg 1971). At Losodok |  | | Book (edition) | | calcareo-siliceous rocks” forming the crest of basalt-covered ridges. He noted (1) that these rocks were...rocks at Kaiserstuhl, Germany. ‘Either xenoliths of basalt or aggregates of silicate species. INTRODUCTION...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...rocks: Ravalli County, Montana, and Verity, British Columbia. Similar are those of Salmon Bay, Alaska, and |  | | 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...as, for example, in the Karoo and Deccan flood basalt provinces. Alkaline magmas, however, may be emplaced...broadly analogous to similar cycles seen in flood basalt provinces preserved on passive continental margins |  | | Journal (article/letter/editorial) | | and key genera of the African Land Mammal Ages. ’Kenya’ is the default country. Two-letter codes (e.g....WR: Warwire; Nyamavi ET: Lonyumun; Moiti; Allia Bay WT: Kanapoi; Ekora OM: Mursi Aterir; Karmosit AW:...Turkana (east side L. Turkana) KV: Kavirondo Rift (SW Kenya) OM: Omo River basin (NE extension Turkana) WR:...deposits, succeeded by sheets of late Oligocene basalt, are exposed by wind erosion. In this area, over...(Table 1), and is named for the district in northern Kenya where the Turkwel River cuts across the Rift Valley |  | | Book | | fossil vertebrates in tuffs of the spectacular volcano that I had mapped in 19909. Thereafter, from 1959...sedimentological and palaeontological studies in the Kenya Rift Valley project. This, indeed, worked exceedingly... GREGORY RIFT VALLEY TANZANIA; OLORGESAILIE, KENYA I51 10. MARY D, LEAKEY. Olduvai Gorge 1911-1975:...SHACKLETON. Geological Map of the Olorgesailie Area, Kenya 171 12. 13. GLYNN LL. IsAAc. The Olorgesailie...Contents B. Tue Lake Barinco Basin, KENYA 14. GREGORY R. CHAPMAN Basin, Kenya & MAUREEN BROOK. Ghronostratigraphy |  | | Book | | northern portion in northern Tanzania, western Kenya, and eastern Uganda where the Nyanzian System, composed...through Rhodesia, Mozambique, Malawi, Tanzania and Kenya, and is characterised by ages of 400-700 m.y. (Cahen...rejuvenated antique sequences: the Nyanzian of Kenya (Sanders, 1965); the Bulawayan of Rhodesia (Johnson...and the Mozambique Belt in western Kenya. Bull. geol. Surv. Kenya, 7. ScureIner, G. D. L., and VAN NIgkERK...formations. In the upper formations, tholeiitic basalt is the most abundant rock type, but felsic lavas |  | | Book | | references The basalt clan General statement Modal Composition Geochemistry The simple basalt system Archaean...modal TS Geochemistry and normative composition Basalt-trachyte rock 74 as 7.6 dal 7.8 Wo 7.10 Chapter...or precipitated out of, a primeval ocean. Both basalt and granite were regarded as being rocks that had...derived from vol- cani vicus, or the seat of a volcano. Desmarest (1771) also worked in the Auvergne and...new class of extrusive peridotite with associated basalt’ (Viljoen & Vil- joen cause 1982: 13). they |  | Takeuchi, Akinori, Hren, Michael T., Smith, Shane V., Chamberlain, C. Page, Larson, Peter B. (2010) Pedogenic carbonate carbon isotopic constraints on paleoprecipitation: Evolution of desert in the Pacific Northwest, USA, in response to topographic development of the Cascade Range. Chemical Geology, 277 (3) 323-335 doi:10.1016/j.chemgeo.2010.08.015 | Journal (article/letter/editorial) | | basaltic lava flows of the mid-Miocene Columbia River Basalt Group in the Ellensburg Formation (Fig. 2). The...unconformably deposited upon the Columbia River Basalt Group (Smith et al., 1989). In the northern part...the dated overlying and underlying Columbia River Basalt Group (Hooper, 2000), of the dated several tuffs...paleoecology of a sedimentary interbed in the Yakima Basalt (Miocene), Palouse Falls, Washington. Northwest...1999. Palaeoenvironments of Early Miocene Kisingiri volcano Proconsul sites: evidence from carbon isotopes |  | | Report (issue) | | Phosphorite General Age Mineralization Batemans Bay Marine chemical sediment nodular Ordovician New...Cretaceous 76 Australia Northern Territory Fannie Bay Marine chemical sediment nodular 78 Australia...pelecypods Late Miocene 121 Australia Victoria Waratah Bay Marine chemical sediment nodular 122 Australia...207 Canada Burritt Island 208 Canada Callender Bay 209 Canada Clay-Howells 210 Canada Crevier Secondary...Nonmarine sedimentary 223 Canada Ontario Argor (James Bay) Magmatic, carbonatite/alkalic 224 Canada Ontario |  | | Book (volume) | | and eluvial gravels, derived from highly alkaline basalt (Figure 5). The main mining area is near the border...Eluvial workings in weathered (decomposed) basalt above basalt lava (Pailin, Cambodia). ß Alan Jobbins....pegmatite areas include the Pala area of San Diego County in California, the Nuristan area of Afghanistan...marble formed by the metamorphism of limestone. Kenya rubies (Mangari area of the Tsavo West National...provide evidence for the 1628 bc eruption of the volcano on Santorini (Thera) which is thought by some archaeologists |  | | 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...of greenish mud from a depth of 1920 m in Baffin Bay, offshore Canada, using a deep-sea grab, representing...replacements in peritidal sediments (e.g., Florida Bay, Andros Island). The dolomite-forming fluids are...nodules have been recorded in the Arabian Sea or the Bay of Bengal, most probably because of the high rates |
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