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2013

Norbert Opiyo Akech*, Masibo{ M, Olago DO.  2013.  Mineral, Oil and Gas Resources. Kenya: A Natural Outlook Geo-Environmental Resources and Hazards. , Oxford, UK: Elsevier
Norbert Opiyo Akech*, Omuombo CA, Masibo{ M.  2013.  General Geology of Kenya. Kenya: A Natural Outlook Geo-Environmental Resources and Hazards. , Oxford, UK: Elsevier Abstract

The geology of Kenya can be divided into five major geological successions:
(1) the Archaean (Nyanzian and Kavirondian), (2) Proterozoic (Mozambique Belt and Bukoban), (3) Palaeozoic/Mesozoic sediments, (4) Tertiary/Quaternary volcanics and sediments, and (5) Pleistocene to Recent soils, alluvial beach sands, evaporites, fossil coral reefs and sandstones at the coast: alluvial and lacustrine sediments of the Rift Valley. There are also volcanic rocks of the Rift Valley from the younger volcanoes.

Oketch, NA, Masibo M, Olago DO.  2013.  Mineral, Oil and Gas Resources. Abstract

The mineral, oil and gas sectors have not played an important role in the economy of Kenya in the past, but the recent discovery of mineral sands and rare earth elements at the coast and oil in the Lokichar Basin in the northern part of the country are proving to be game changers in the mining, oil and gas sectors. The most important minerals mined in the past have been mainly industrial minerals with soda ash and fluorspar being the most important products. Significant tonnage of gold was mined in western parts of Kenya, but currently only minor exploration and production from the old mine sites is taking place. However, with the increased interest and the government resolve to improve mineral exploration, new mineral finds are possible. Exploration for oil and gas has been taking place in Kenya since the 1950s, but it is only recently that significant oil finds have been reported. The findings have inspired several companies to explore for oil and gas within all the major sedimentary basins in Kenya, namely, the Lokichar Basin, Turkana Basin, the Kerio and Baringo Basin, the Anza Basin, and the Lamu Basin.

2005

O, PROFBARONGOJUSTUS, OPIYO PROFAKECHNOBERT.  2005.  Mulwa, J. K., Gaciri, S. J., Opiyo-Akech, N and Kianji, G. K., 2005. Geological and structural influence on groundwater distribution and flow in Ngong area,. Kenya. African Journal of Science and Technology, vol. 6, No. 1, pp. 105-115. : UNIVERSITY OF NAIROBI Abstract
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2002

2001

OPIYO, PROFAKECHNOBERT.  2001.  C.A. Hauzenberger, G. Hoinkes, A.H. Bauernhofer, E. Wallbrecher, H. Fritz, J. Loizenbauer, M. Th. PTt-evolution of Pan- African Granulites in SE-Kenya. EUG 2001.. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  2001.  Mining in Kenya: Mining annual review 2001:. Mining Journal Ltd. CD-ROM.. : UNIVERSITY OF NAIROBI Abstract
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2000

Späth, A, Le Roex AP, Opiyo-Akech N.  2000.  The petrology of the Chyulu Hills volcanic province, southern Kenya. AbstractThe petrology of the Chyulu Hills volcanic province, southern Kenya

The Quaternary Chyulu Hills Volcanic Province is located more than 100 km east of the Kenya Rift Valley. It consists of a large number of free-standing and coalesced volcanoes and cinder cones and numerous lava flows ranging in composition from nepheline-normative nephelinites, basanites, alkali basalts and hawaiites to orthopyroxene-normative subalkali basalts. In this paper, the authors briefly outline the geological setting of the Chyulu Hills Volcanic Province, present a classification scheme for its lavas and describe their petrography. Mineral chemistry data for selected olivine and clinopyroxene phenocrysts are presented together with the bulk rock major element compositions of selected samples. The petrography, phenocryst chemistry and bulk rock composition of the typically primitive Chyulu Hills lavas are consistent with a differentiation history dominated by olivine control. A process of delayed olivine fractionation, combined with limited mantle olivine accumulation, is proposed to explain the considerable compositional variability observed among olivine phenocryst cores. A trend of decreasing degree of silica-undersaturation from the oldest lavas, erupted in the northern Chyulu Hills, to progressively younger lavas in the southern part of the province is explained as a result of an age progressive decrease in the depth of melt generation and a coincident increase in the degree of melting.

Aduda, BO, Opiyo N(ed.).  2000.  African Journal of Science and Technology. Website
OPIYO, PROFAKECHNOBERT.  2000.  Spath A., Anton P. le Roex and N. Opiyo-Akech, (2000) - The petrology of the Chyulu hills volcanic Province, Southern Kenya:. Journal of African Earth Sciences, Vol. 31, No. 2., 34-92.. : UNIVERSITY OF NAIROBI Abstract
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MATHU, PROFMUTHUMBIELIUD, MATHU PROFMUTHUMBIELIUD, OPIYO PROFAKECHNOBERT, OPIYO PROFAKECHNOBERT, OPIYO PROFAKECHNOBERT.  2000.  A reappraisal of the geology, structures and tectonics of the Mozambique belt East of the Kenya Rift System. Journ. Afri. Ear. Sci. 30:60.. Kenya and the Pare-Usambara Mts. N.E. Tanzania. Journ. Afr. Eath Sci. 30:10.. : UNIVERSITY OF NAIROBI Abstract
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MATHU, PROFMUTHUMBIELIUD, MATHU PROFMUTHUMBIELIUD, OPIYO PROFAKECHNOBERT.  2000.  Pan African high pressure granulites, Taita Hills - Tsavo East National Park, Kenya. Journ. Afri. Ear. Sci. 30:37.. Kenya and the Pare-Usambara Mts. N.E. Tanzania. Journ. Afr. Eath Sci. 30:10.. : UNIVERSITY OF NAIROBI Abstract
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MATHU, PROFMUTHUMBIELIUD, MATHU PROFMUTHUMBIELIUD, OPIYO PROFAKECHNOBERT.  2000.  Strain and kinematic analysis of major tectonostratigraphic units from the Mozambique Belts of the Voi District, S.E.. Kenya and the Pare-Usambara Mts. N.E. Tanzania. Journ. Afr. Eath Sci. 30:10.. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  2000.  Mining in Kenya: Mining annual review 2000:. Mining in Kenya: Mining annual review 2000:. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  2000.  Methodology for Image Analysis and Land Cover Classification of Nakuru-Menengai Area (Central Rift Valley, Kenya) .:. African Journal of Science and Technology, Science and Engineering series Vol.1 No.1 pp18 -27. : UNIVERSITY OF NAIROBI Abstract
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1999

Späth, A, Le Roex AP, Opiyo-Akech N.  1999.  Plume-lithosphere Interaction and the Origin of Continental Rift-related Alkaline Volcanism - the Chyulu Hills Volcanic Province, Southern Kenya. AbstractPlume-lithosphere Interaction and the Origin of Continental Rift-related Alkaline Volcanism - the Chyulu Hills Volcanic Province

Geochemical data are presented for primitive alkaline lavas from the Chyulu Hills Volcanic Province of southern Kenya, situated some 100 km east of the Kenya Rift Valley. In addition to their primitive compositions, a striking and ubiquitous feature is a strong but variable depletion in K relative to other highly incompatible elements when normalized to primitive mantle values. Semi-quantitative models are developed that best explain the petrogenesis of these lavas in terms of partial melting of a source that contained residual amphibole (but not phlogopite). The presence of amphibole implies a source in the subcontinental lithosphere rather than the asthenosphere. It is suggested that the amphibole is of metasomatic origin and was precipitated in the lithospheric mantle by infiltrating fluids and/or melts derived from rising mantle plume material. A raised geotherm as a consequence of the continued ascent of the plume material led to dehydration melting of the metasomatized mantle and generation of the Chyulu Hills lavas. It is proposed that the Chyulu Hills Volcanic Province represents an analogue for the earliest stages of continental rift initiation, during which interaction between a plume and initially refractory lithosphere may lead to the generation of lithospheric melts.

OPIYO, PROFAKECHNOBERT.  1999.  Opiyo -Akech, N, J. Tarney and Hoshino, M (1999): Petrology and geochemistry of granites from the Archaean terrain north of Lake Victoria, Western Kenya. Journal of African Earth Sciences. Vol.29 No.2 pp283 -300.. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  1999.  Opiyo -Akech, N and J. O. Barongo (1999): Earth Science Education In Kenya. Journal of African Earth Sciences. Vol.28 No.4 pp795 -803.. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  1999.  Geomorphology, Geology and water resources of the Got Ramogi area. In: Prof.T.R. Odhiambo (Editor): GOT RAMOGI SACRED FOREST: P. and Omenge, J. Principles of Forest1994 Conservation and Utilization in Tropical Africa.. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  1999.  Mineral chemistry and thermobarometry of the Neoproterozoic Mozambique Belt intrusive rocks of the Matuu-Masinga area, central Kenya.. Journal of African Earth Sciences, Vol. 28, No. 4A., 58-60.. : UNIVERSITY OF NAIROBI Abstract
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MUNYAO, DRNYAMAICHRISTOPHER, OPIYO PROFAKECHNOBERT.  1999.  Geochemistry and Tectonomagmatic affinities of the Mozambique belt intrusive rocks in Matuu-Masinga area, central Kenya. Gondwana Research, Vol.2, pp. 387-399.. Journal of African Earth Sciences Vol.29, Issue 2. pp 281-282. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  1999.  8. Muhongo S. and N. Opiyo-Akech , 1999 - Geology and mineral resources of east Africa:. Journal of African Earth Sciences Vol.29, Issue 2. pp 281-282. : UNIVERSITY OF NAIROBI Abstract
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1998

1996

Nyambok, IO, Mathu EM, Opiyo-Aketch N, Barongo JO, Legge PL.  1996.  Development in earth Science Education in East Africa.. Website

1995

1994

1993

OPIYO, PROFAKECHNOBERT.  1993.  Tectono-Magmatic emplacement and Evolution of the Archaean greenstone Associations from western Kenya (Extended Abstract).. 16th International Colloquium of African Geology, Ezulwini, Swaziland) pp264-268.. : UNIVERSITY OF NAIROBI Abstract
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1992

OPIYO, PROFAKECHNOBERT.  1992.  Opiyo -Akech, N - Tectono -Magmatic emplacement of the Kenyan Granite Greenstones: Geochemical evidence from the Maseno area, western Kenya.. African Journal of Science and Technology, Vol.6 No.2 pp27 -33. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  1992.  Geochemical evidences for the Emplacement of the Archaean greenstone volcanics from the area around Maseno, western Kenya.:. African Journal of Science and Technology, Vol.6 No.2 pp56 -63. : UNIVERSITY OF NAIROBI Abstract
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OPIYO, PROFAKECHNOBERT.  1992.  Geochemistry and Petrogenesis of the Archaean Granites from the north of lake Victoria of the greenstone terrain in western Kenya (Abstract).. The 29th International Geological Congress, Kyoto, Japan.. : UNIVERSITY OF NAIROBI Abstract
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