 | Gevera, Patrick Kirita, Cave, Mark, Dowling, Kim, Gikuma-Njuru, Peter, Mouri, Hassina (2020) Naturally Occurring Potentially Harmful Elements in Groundwater in Makueni County, South-Eastern Kenya: Effects on Drinking Water Quality and Agriculture. Geosciences, 10 (2) 62 doi:10.3390/geosciences10020062 | Journal (article/letter/editorial) |
| Harmful Elements in Groundwater in Makueni County, South-Eastern Kenya: Effects on Drinking Water Quality...Management, South Eastern Kenya University, Kitui P.O. Box 170-90200, Kenya; pnjuru@seku.ac.ke Correspondence:... Abstract: Makueni County is located in the semi-arid south-eastern Kenya region characterized...by both the World Health Organization (WHO) and Kenya Bureau of Standards (KEBS) in up to 55% of the samples...health [1]. Makueni County is located in the arid and semi-arid land (ASAL) regions of Kenya that receives |
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| Five specimens of alkaline basalts from the Chyulu Hills were collected and analysed at the Center for...series of studies of rocks of the Gregory Rift of Kenya and of nearby areas. Saggerson (1963, 1968) studied...as basalts. Here I present selected data on the Chyulu specimens to /II~rate their compositional peculiarities...Further studies of the rocks of this and similar basalt fields are in progress, and presentation of detailed...deferred until those studies are completed. The Chyulu basalt field is one of three groups of cones and associated |
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| Lithospheric thickness beneath the southern Kenya Rift: implications from basalt geochemistry Received: 18 September...samples from the ¯anks and ¯oor of the southern Kenya Rift Valley in the Lake Magadi area, and from two...is absent beneath this section of the southern Kenya Rift. Introduction The eastern branch of the East...petrological studies have largely focused on the Kenya dome region of the rift valley, and on the cause...breakup (as manifested in the past by major ¯ood basalt provinces) have frequently been considered to be |
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| and granulite xenoliths from the Chyulu Hills volcanic field, Kenya: gabbro–troctolitic cumulates subjected...Ca–Al granulite xenoliths from the Chyulu Hills volcanic field, Kenya, suggest that the samples represent...meta-igneous cumulates from the Chyulu Hills volcanic field (eastern flank of the Kenya Rift), located within the...tertiary to recent alkaline magmatism related to the Kenya Rift. The geochemical and textural features of the...belong to the Pan-African arc lithosphere of the Chyulu Hills thinned by some foundering process such as that |
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| the lithospheric mantle below the Chyulu Hills volcanic field, Kenya Jens Hopp ⁎, Mario Trieloff, Rainer...Quaternary volcanic field of Chyulu Hills, S Kenya, c. 100 km east of the Kenya rift graben. 4He/3He ratios...subcontinental lithosphere; Kenya rift; mantle plume 1. Introduction The Kenya Rift is part of the East...doi:10.1016/j.epsl.2007.07.027 Oligocene in N Kenya (McDougall and Watkins, 1988), approximately contemporaneously...south- and eastward (Baker, 1987; Morley, 1999). The Kenya Rift graben roughly follows the contact between |
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| Sr isotopic ratios are similar to Oceanic Island Basalt (OIB), the more radiogenic samples (87Sr/86SrN...studies in the region. Laser incremental-heating of basalt samples and single grain total fusion of anorthoclase...trachydacites near its base to trachyandesite, basalt and rhyolite at the top (Grommé et al., 1970; Hay...widens from about 50 km, as is typical in southern Kenya, to approximately 200 km wide splitting into three...volcanics, e.g., in the Naivasha complex, Central Kenya (Davies and MacDonald, 1987). The earliest evidence |
 | Ulianov, Alexey, Kalt, Angelika, Pettke, Thomas (2005) Hibonite, Ca(Al,Cr,Ti,Si,Mg,Fe2)12O19, in granulite xenoliths from the Chyulu Hills volcanic field, Kenya. European Journal of Mineralogy, 17 (2) 357-366 doi:10.1127/0935-1221/2005/0017-0357 | Journal (article/letter/editorial) |
| in granulite xenoliths from the Chyulu Hills volcanic field, Kenya ALEXEY ULIANOV1,*, ANGELIKA KALT1...Switzerland Abstract: In basanites of the Chyulu Hills volcanic field, Kenya, hibonite is found in two xenoliths...granulite xenoliths from the Chyulu Hills volcanic field, southern Kenya, showing textural relationships...of comagmatic meta-igneous xenoliths from the Chyulu Hills that includes the studied granulites, all could...(Ireland et al., 1991; Russell et Hibonite from the Chyulu Hills is similar to other terres- al., 1998) and simplified |
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| origin of the Ethiopian-Yemeni Oligocene flood basalt province is widely interpreted as representing...volume volcanic events in Turkana (N. Kenya), Chyulu Hills (S. Kenya) and the Virunga province (Western...areas of elevated topography, the Ethiopia and Kenya domes, separated by the highly extended Turkana...over time. The Oligocene Afar and Yemeni flood basalt provinces are consistently interpreted as products...melting during the generation of the Oligocene flood basalt province. We then evaluate the evidence for smaller-scale |
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| 45r3 Pa 1 Mo 22 Chyulu Hills, Kenya Marsabit, Kenya Cantal, France Chyulu Hills, Kenya Deves, ` France...France Chyulu Hills, Kenya Chyulu Hills, Kenya Chyulu Hills, Kenya Vitim, Russia San Carlos, USA Vivarais...Causses, France Chyulu Hills, Kenya Marsabit, Kenya Chyulu Hills, Kenya Chyulu Hills, Kenya grt websterite...1999.. Garnet lherzolites from Marsabit and Chyulu Hills volcanic fields ŽKenya. have coarse–grained...7808C at ; 1.6 GPa for a garnet pyroxenite from Chyulu Hills. Temperatures for peridotites and pyroxenites |
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| nodules associated with alkaline olivine basahs, Kenya By E. P. SAGGERSON,Durban*) With 9 figures and 8...basalts and associated eclogite nodules from southern Kenya are described and attention drawn to the chemical...nodules associated with alkaline olivine basalts, Kenya Is eo~epa~aa~e nopo~ax E)}EHOfi t{eHr~r[. ABTOp...Although garnet peridotite and eclogite nodules in basalt-host rock were s thought to be crystal segregations...Kapiti P h o n o l i t e s Scale 0 I. . . . . 2 Chyulu B a s a lBt Sa as na dn i t e s ~ 20 I 40MILES |
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| The latest stages in the evolution of the rift in Kenya were marked by intense volcanic activity along the...much of the rift floor in central and southern Kenya, but fissure basalts become increasingly more prominent...generally true that Quaternary volcanism within the Kenya rift was predominantly trachytic whereas activity...ultimately converge. Moreover, by considering only the Kenya rift, the generalisation conveniently excludes a...the Gregory Rift Valley 57 Southern part of the Kenya rift From the equator to latitude i °3o'S the rift |
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| S3.00 Metamorphic Petrology of Xenoliths from Kenya and Northern Tanzania and Implications for Geotherms...Quaternary volcanic field of Marsabit (northern Kenya) bear strong evidence of decompression and cooling...1). Pyroxenitic xenoliths from the Quaternary Chyulu Hills are characterized by pyroxenes with exsolution...kb to 785 °C at 16 kb. Garnet peridotites from Chyulu are mostly granular. Matrix pyroxenes are devoid...common evolution. Individual P-T data points from Chyulu and from stage 1 of Marsabit plot along a 60 raW/m1 |
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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...sub-province, and (c) the Rift Valley trachyte/ olivine basalt sub-province. Mela-nephelinitic lavas in the two...basanite (or olivine mela-nephelinite) and by olivine basalt may contribute to the development of phonolite...Available supporting evidence is discussed, both from Kenya and from similar volcanic provinces elsewhere. The |
 | Kaeser, Benjamin, Olker, Bettina, Kalt, Angelika, Altherr, Rainer, Pettke, Thomas (2009) Pyroxenite xenoliths from Marsabit (Northern Kenya): evidence for different magmatic events in the lithospheric mantle and interaction between peridotite and pyroxenite. Contributions to Mineralogy and Petrology, 157 (4) 453-472 doi:10.1007/s00410-008-0345-6 | Journal (article/letter/editorial) |
| PAPER Pyroxenite xenoliths from Marsabit (Northern Kenya): evidence for different magmatic events in the...from Quaternary basanites of Marsabit, northern Kenya, were analysed for microstructures and mineral compositions...alkaline magmatism during the development of the Kenya rift. Keywords Pyroxenite Mantle xenoliths Thermobarometry...the Marsabit shield volcano in the context of the Kenya rift magmatism (e.g., Henjes-Kunst and Altherr 1992)...cpx compositions overlap with those of alkaline basalt-hosted cpx megacrysts (Fig. 3). Zoning profiles |
 | Shinjo, Ryuichi, Chekol, Takele, Meshesha, Daniel, Itaya, Tetsumaru, Tatsumi, Yoshiyuki (2011) Geochemistry and geochronology of the mafic lavas from the southeastern Ethiopian rift (the East African Rift System): assessment of models on magma sources, plume–lithosphere interaction and plume evolution. Contributions to Mineralogy and Petrology, 162 (1) 209-230 doi:10.1007/s00410-010-0591-2 | Journal (article/letter/editorial) |
| East African Rift System Southern Ethiopia Kenya plume Afar plume African superplume Sr–Nd–Pb...least two distinct mantle plumes, the Afar and Kenya plumes, that have supported the Ethiopian and the...Ethiopia were related to melting associated with the Kenya plume and driven to their present position now under...northeastward migration of the African plate over the Kenya plume for the past 50 Myr. Plume–lithosphere interaction...and Rogers (2002) proposed a mantle plume source (Kenya plume) for the pre-rift basalts and an enriched |
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| 24, 2016 Volcanic volumes associated with the Kenya Rift: recognition and correction of preservation...Igneous Provinces (LIPs) due to the vast amount of basalt erupted. However, other rifts may be nearly amagmatic...the rift section that runs through the country of Kenya and into northern Tanzania (Fig. 2). This is merely...km, not counting the several side branches. The Kenya Rift represents ‘birth’ to ‘adolescent’ stages of...Watkins 2006). The age of the oldest volcanism within Kenya decreases to the south, such that near the Tanzanian |
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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 |
 | Casagli, Alessio, Frezzotti, Maria Luce, Peccerillo, Angelo, Tiepolo, Massimo, De Astis, Gianfilippo (2017) (Garnet)-spinel peridotite xenoliths from Mega (Ethiopia): Evidence for rejuvenation and dynamic thinning of the lithosphere beneath the southern Main Ethiopian Rift. Chemical Geology, 455. 231-248 doi:10.1016/j.chemgeo.2016.11.001 | Journal (article/letter/editorial) |
| the Turkana depression and the Anza Graben, the Kenya Rift, and Tanzania; Fig. 1a), revealed the presence...have been reported only from the Anza Graben, the Kenya Rift, and Tanzania (Dawson and Smith, 1988; Henjes-Kunst...extends from Arabian-Nubian shield to Ethiopia, Kenya, and the eastern margin of the Tanzanian craton...NW-SE oriented basins, including the Anza Graben in Kenya (Corti, 2009). Tertiary volcanism and rifting processes...plateau (Fig. 1a), a wide IP continental flood basalt province, extending south-west from to the Red |
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| subjected to metamorphism) in the Chyulu Hills volcanic field, Kenya. Incorporation of trace and rare earth...meta-igneous granulites from the Chyulu Hills volcanic field, Kenya. On the basis of the partition coefficients...abundance of LREEs is significantly lower in the Chyulu Hills hibonite when compared with the hibonite of...clinopyroxene and perovskite in melilite–nepheline basalt, Nyiragongo, Zaire. Geochemical Journal 15, 221–228... in granulite xenoliths from the Chyulu Hills volcanic field, Kenya. European Journal of Mineralogy 17 |
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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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| River Basalt Group are reviewed and compared with those for other flood basalts and the Chyulu basalts...basalts of Kenya. Flows of the Grande Ronde Formation, which constitutes more than two-thirds by volume of...of the Columbia River Basalt Group, in several respects resemble calc-alkaline rocks, and they plot in...to the anomalous setting of the Columbia River Basalt Group as a whole. Calc-alkaline characteristics...lithospheric slabs. 1. Introduction 2. Columbia River Basalt Group O u r purposes in writing this short note |
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| cannot easily explain phenomena such as large flood basalt provinces and lithospheric rupture within continental...began propagating into northern Tanzania/southern Kenya at ~ 5 to 8 Ma (Baker 1987; Dawson 1992; Kampunzu... 85 Fig. 1 Map of northern Tanzania/southern Kenya; light gray: Pliocene—recent volcanic rocks, black:...expected, volcanism in northern Tanzania/southern Kenya (also known as the Northern Tanzania Divergence)...with, prior to eruption. Magma types vary from basalt to rhyolite suites, trachytes, phonolites, nephelinites |
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| differences in the contemporaneous volcanism in southern Kenya and northern Tanzania, the differences taking place...south Kenya and north Tanzania Table 8.1 summarizes the volcanic stratigraphy of southern Kenya and northern...onset of basaltic activity in Kenya (Baker et al. 1972). In southern Kenya during this period, volcanic...active during this period are Ngong and Ol Esayeti (basalt and basanite: 6.7– 3.6 Ma), Olorgesaile (trachyte...hypersthene-normative basalt (Le Roex et al. 2001), but the relatively large amounts of trachyte in Kenya find their |
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| Delta in the south, through Djibouti, Ethiopia, Kenya, Uganda, Burundi, Rwanda, Democratic Republic of...province (also known as the Ethiopia-Yemen flood basalt province) (Fig. 1). Thus, the region records both...both the evolution of Earth' s youngest flood basalt province, its most youthful passive continental margins...southwestern Ethiopia, southeastern Sudan, and northern Kenya at 40-45 Ma (Davidson & Rex 1980; Ebinger et al...Red Sea began at 28 Ma, soon after the peak flood basalt volcanism (e.g. Wolfenden et al. 2005). The earliest |
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| across the East African Rift Valley in Kenya (KRISP: the Kenya Rift International Seismic Project; Prodehl...observations on the northern Tanzania and southern Kenya sectors of the Gregory Rift Valley. The interpretation...u. (Fig. 4.1). The anomaly, which is highest in Kenya and decreases southwestwards, lies slightly to the...particularly apparent where the domal uplift in Kenya coincides with the most negative gravity values...lithosphere. Along the axis of the rift valley in Kenya is a thin, positive (high-density) anomaly that |
